JP2009099510A - Lighting device - Google Patents

Abstract

A plurality of colors included in an object to be illuminated can be shown vividly, and a plurality of colors according to the changed object can be shown vividly even when the object to be illuminated changes. It is providing the illuminating device which can do.
An illumination device includes an image sensor, a calculation unit, a control unit, and a light source unit. The light source unit 14 can emit at least red, green, and blue light. The image sensor 11 captures an object illuminated by the light source unit. The calculation unit 12 calculates color components distributed on the object based on the captured image. The control unit 13 controls the color light of the light source unit according to the color component distributed on the object obtained by the calculation unit.
[Selection] Figure 1

Description

  The present invention relates to a lighting device for making an object color appear more vividly.

  For example, it is well known that foods such as fresh meat and fresh fish have an effect of rendering fresh meat and fresh fish vividly colored by removing yellowing. Therefore, in order to absorb the light emission energy around 580nm (yellow component), neodymium bulbs with neodymium mixed in the bulbs of incandescent bulbs have already been sold by various lighting manufacturers. This effect is known to have the same effect in other illumination lamps such as fluorescent lamps.

Here, as a method for quantitatively evaluating the color rendering properties (color appearance) of a conventional illumination lamp, there is a “method for evaluating the fidelity of color appearance”.
This is a method to quantitatively evaluate how faithfully the target lighting lamp reproduces the color compared to the standard light such as sunlight or incandescent bulb light. Currently, JIS Z 8726 “Color rendering of light source” It is defined in “Evaluation Method” and is represented by a numerical value of the average color rendering index Ra.

Further, as a method for evaluating the subjective preference of color rendering, there is a color gamut area ratio (hereinafter referred to as Ga) described in the reference of JIS Z 8726 (color rendering property evaluation method other than based on the color rendering index). This Ga makes it possible to evaluate whether the object color looks vivid or dull when illuminated with a light source. When Ga is greater than 100, the saturation increases and the object color looks vivid. On the other hand, when Ga is less than 100, the saturation is reduced and the object color appears dull.
In addition, the lamp described in Patent Document 1 defines a conspicuous index that allows the four-color test colors (red, yellow, blue, and green) to appear vividly. Yes.
Japanese Patent No. 3040719

However, since the neodymium bulb and the lamp described in Patent Document 1 always illuminate an object with a single color light, a plurality of colors included in the illuminated object cannot be displayed vividly. Further, the neodymium bulb and the lamp described in Patent Document 1 cannot cope with a change in the object to be illuminated.
Furthermore, for example, when an object is illuminated with light of a single color, if the object to be illuminated is a white object such as tableware, the white object appears to be colored and appears white. There is also a problem of disappearing.

In view of the above problems, an object of the present invention is to provide an illuminating device that can clearly show a plurality of colors included in an object to be illuminated.
Another object of the present invention is to provide an illuminating device capable of vividly showing a plurality of colors according to the changed object even when the object to be illuminated changes.
Furthermore, an object of the present invention is to provide an illuminating device that can make a white object appear when the object to be illuminated is a white object such as tableware.

  According to the first aspect of the present invention, there is provided a lighting device comprising: a light source unit capable of emitting at least red, green, and blue light; an image sensor that captures an object illuminated by the light source unit; and an object based on the captured image. A calculation unit that calculates a color component distributed above; and a control unit that controls the color light of the light source unit according to the color component distributed on the object obtained by the calculation unit.

  In the above description, the light source unit may be configured by a lighting device using three-color LEDs that emit three-color light of, for example, red, green, and blue light. Alternatively, it may be a lighting device using a discharge lamp coated with a phosphor that develops red, green, and blue light. Furthermore, for example, by illuminating white light from an incandescent lamp or a white LED onto a transmissive color liquid crystal panel on which a color image is projected, it may be possible to perform color light illumination that substantially matches the content of the color image. Alternatively, color light illumination may be performed by using white light from an incandescent lamp or white LED as a color light that has been separated into red, green, and blue light by a prism or the like.

The image sensor is composed of a CCD or CMOS sensor provided with, for example, an RGB color filter or an XYZ filter.
The calculation unit and the control unit are configured by a microcomputer or a microprocessor, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.

  The lighting device according to a second aspect of the present invention is the lighting device according to the first aspect, wherein the calculation unit calculates a color distribution corresponding to the position of each part of the object in the photographed image, and the control unit. Is characterized in that the light source unit is controlled to generate a color distribution corresponding to the position on the object.

  A lighting device according to a third aspect of the present invention is the lighting device according to the first aspect, wherein the calculation unit detects the color of the object in the photographed image and is the most contained color among the objects. The control unit controls the light source unit to create the light color determined by the calculation unit.

A lighting device according to a fourth aspect of the present invention is the lighting device according to the first or third aspect, wherein the image sensor includes a filter approximating an XYZ color matching function.
According to a fifth aspect of the present invention, in the lighting device according to the first aspect, the calculation unit detects R, G, B gradation values of each pixel in the photographed image, and according to the gradation value. And calculating the light mixture ratio in the light source unit, and the control unit controls the light source unit to reproduce the light mixture ratio determined by the calculation unit.

A lighting device according to a sixth aspect of the present invention is the lighting device according to the first or fifth aspect, wherein the image sensor includes an RGB color filter.
A lighting device according to a seventh aspect of the present invention is the lighting device according to any one of the third to sixth aspects, wherein only a portion to be emphasized or a portion excluding the background in the photographed image is selected as a target portion. And a means for enhancing a color within a selected range.

The illumination device according to an eighth aspect of the present invention is the illumination device according to any one of the first to seventh aspects, wherein the light source unit is a projection projector.
A projection projector, like a liquid crystal projector, can emit color light that substantially matches the content of a color image by irradiating white light with a color image projected on a transmissive color liquid crystal panel. .

  The lighting device according to a ninth aspect of the present invention is the lighting device according to the fifth aspect, wherein the calculation unit is configured to calculate the R, G, B gradation values of all or a part of each pixel of the image captured by the image sensor. And calculating means for calculating the ratio of R, G, B gradation values for each pixel; chromatic or achromatic color for each pixel based on the calculated ratio of R, G, B gradation values for each pixel An achromatic color judging means for judging whether or not; a white judging means for distinguishing a white pixel from a gray pixel among the pixels judged to be achromatic color; and the control unit has a number of pixels judged to be the white pixel. When the ratio is equal to or greater than a predetermined ratio with respect to the number of all or part of the image, the light source unit so that the light source color due to R, G, B mixed light falls within the range of deviation 0.02 from the black body radiation locus. It is characterized by controlling.

  According to a tenth aspect of the present invention, in the illuminating device according to the ninth aspect, the achromatic color determining means is such that the ratios of the R, G, and B gradation values for each pixel in the calculating means are all predetermined ratios. If it is above, it is determined as an achromatic color, and the white determination means calculates an average gradation value of R, G, B gradation values of pixels determined as an achromatic color in the achromatic color determination means, and the average If the gradation value is greater than or equal to a predetermined gradation value or greater than a predetermined reference value, the pixel is determined as a white pixel, and the control unit determines that the ratio of the number of pixels determined as the white pixel is all or part of the image. If the ratio is greater than or equal to a predetermined ratio with respect to the number of pixels, the light source color due to R, G, B mixed light is controlled to fall within a range of 0.02 from the black body radiation locus.

The illuminating device according to an eleventh aspect of the present invention is the lighting device according to the tenth aspect, wherein the predetermined ratio in the achromatic color determining unit is 30%, and the predetermined gradation value in the white determining unit is 200 (all gradations). 0 to 255), the predetermined ratio in the control unit is 20%.
The illuminating device of claim 12 according to the present invention is the illuminating device according to claim 10 or 11, wherein the predetermined ratio in the achromatic color determining means, the predetermined gradation value in the white determining means, and the predetermined in the control unit. It is characterized in that at least one of the ratios can be set variably.

  A lighting device according to a thirteenth aspect of the present invention is the lighting device according to the fifth aspect, wherein the calculation unit includes the position of each pixel in an image photographed by the image sensor and the R, G, and B floors of each pixel. A first storage unit for holding a tone value; the position of each pixel in the next photographed image, the R, G, B gradation values of each pixel, and the R, G, B of each pixel at the previous photographing A second storage unit that calculates and holds a difference value of gradation values; and compares an nth (n is an integer of 1 or more) difference value with an (n + 1) th difference value, Means for detecting movement, and when the object does not move from the comparison result, the dimming state at that time is maintained.

  A lighting device according to a fourteenth aspect of the present invention is the lighting device according to the thirteenth aspect, wherein the means for detecting the movement of the object obtains a difference between the (n + 1) th difference value and the nth difference value. The movement of the object is determined based on whether the difference is smaller than a predetermined threshold value.

The illuminating device of claim 15 according to the present invention is the illuminating device according to claim 13 or 14, wherein imaging of the image by the image sensor is performed every time the light mixture ratio determined by the calculation unit is reproduced. Features.
The illuminating device of claim 16 according to the present invention is the illuminating device according to claim 13 or 14, wherein the imaging of the image by the image sensor is performed during and during reproduction of the light mixture ratio determined by the calculation unit. It is performed.

  The illuminating device according to claim 17 of the present invention is the illumination device according to claim 5, wherein the calculation unit is configured to perform R, G, B gradations of all or a part of each pixel of the image captured by the image sensor. Calculating means for calculating xy chromaticity from a value; and white determination means for discriminating whether each pixel is a white pixel based on the calculated xy chromaticity for each pixel; and the control unit includes the white pixel If the ratio of the number of pixels determined to be equal to or greater than a predetermined ratio with respect to the total or part of the number of pixels, the light source color due to R, G, B mixed light is within a range of deviation 0.02 from the black body radiation locus The light source unit is controlled so as to enter the inside.

  The illumination device according to claim 18 of the present invention is the illumination device according to claim 5, wherein the image sensor includes an XYZ filter approximating a CIE1931 color matching function, and the arithmetic unit is photographed by the image sensor. Measuring means for measuring the xy chromaticity of each or all of the pixels of the image; and white determination means for discriminating whether each pixel is a white pixel based on the measured xy chromaticity of each pixel, When the ratio of the number of pixels determined as the white pixel is equal to or greater than a predetermined ratio with respect to the number of all or a part of the image, the control unit sets the light source color due to R, G, B mixed light to a black body. The light source unit is controlled to fall within a range of deviation 0.02 from the radiation locus.

  A lighting device according to a nineteenth aspect of the present invention is the lighting device according to the seventeenth or eighteenth aspect, wherein the predetermined ratio is 20%.

  The illuminating device according to claim 20 of the present invention is the illumination device according to claim 5, wherein the calculation unit sets an initial value of a light mixture ratio of each light source color of the light source unit; Means for detecting the change of the object over time based on the gradation value of each pixel of the image obtained; and means for returning the light mixture ratio to the initial value when the change of the object is detected. And an R, G, B gradation value of each pixel of an image photographed in a light mixture state at an initial value is detected, and a light mixture ratio of the light source unit is calculated according to the gradation value.

  Here, the light mixture ratio of the light source colors can be said to be the ratio of the intensity of each color light of R, G, B, in other words, the ratio of the dimming rate (%) for each color light of R, G, B. .

  According to the 21st aspect of the present invention, in the illuminating apparatus according to the 20th aspect, the means for detecting the change of the object with time is an n + 1th difference value (n is an integer of 1 or more) and n. A difference with the second difference value is calculated, and a change in the object is detected based on whether or not the difference is smaller than a predetermined threshold value.

According to the first aspect of the present invention, a plurality of colors included in the illuminated object can be shown vividly. Further, even when the illuminated object changes, a plurality of colors corresponding to the changed object can be shown vividly. Even if the object changes, the object can be displayed vividly by processing in real time.
According to the invention of claim 2, a plurality of colors included in the illuminated object can be shown vividly. Further, even when the illuminated object changes, a plurality of colors corresponding to the changed object can be shown vividly. Even if the object changes, the object can be displayed vividly by processing in real time.

According to the third aspect of the present invention, it is possible to create an illumination environment in which the color is emphasized by vividly showing the color component that is most frequently included among the plurality of colors included in the object to be illuminated. Even if the object changes, the object can be displayed vividly by processing in real time.
According to the invention of claim 4, by using an image sensor with an XYZ filter, the xy chromaticity is obtained at a plurality of points of the image, the xy chromaticity of each point is plotted on the chromaticity diagram, and the range of each color name By detecting the color with the largest number of plots, the color with the largest number of plots can be determined as the color that is contained most in the object.

According to the invention of claim 5, the RGB gradation value of the image obtained by photographing the object to be illuminated is detected by using the image sensor, and red, green, and blue light are mixed at a light mixture ratio corresponding to the RGB gradation value. By turning on, it is possible to create an illumination environment that emphasizes the color of the object. Even if the object changes, the object can be displayed vividly by processing in real time.
According to the invention of claim 6, the object to be illuminated is photographed by an image sensor with an RGB color filter, and the RGB gradation value of each pixel is detected, whereby the ratio of RGB components contained in the object is determined. Thus, it is possible to irradiate an object with colored light that looks vivid.
According to the seventh aspect of the present invention, the range to be emphasized more accurately can be shown vividly.

According to the eighth aspect of the present invention, it is possible to irradiate a color image obtained by photographing a target object as color light almost as it is with the projection projector, and a plurality of colors included in the target object are vividly displayed. Can be realized.
According to the ninth aspect of the present invention, if the ratio of the number of white pixels to the total number of pixels used for processing is equal to or greater than a predetermined ratio, the area occupied by the white pixels with respect to all pixels to be processed has a certain width or more. Therefore, it is possible to make a white object appear white by controlling the light source color so that it falls within the white range necessary for white on the chromaticity diagram (with a deviation of 0.02 from the black body radiation locus). .

  According to the invention of claim 10, the ratio value in the achromatic color determining means, the gradation value in the white determining means, and the ratio (control condition value) in the control unit are defined as conditions for making white appear white. Can do.

According to the invention of claim 11, if the ratio value in the achromatic color determination means is 30%, the gradation value in the white determination means is 200, and the ratio value in the control unit is 20%, the white object is white. An example of conditions for showing can be presented.
According to the invention of claim 12, by making it possible to variably set at least one of the three values shown in claim 10 or 11, adjustment for making white appear white is easily performed. Is possible.

  According to the invention of claim 13, when the object is not changed, it is possible to prevent the control so that the color of the object becomes excessively bright.

  According to the invention of claim 14, when the object is not changed, it is possible to prevent the control so that the color of the object becomes excessively bright.

  According to the fifteenth aspect of the present invention, when the object is not changed, it is possible to prevent the control so that the color of the object becomes excessively bright.

  According to the invention of claim 16, when the object has not changed, it is possible to prevent the control so that the color of the object becomes excessively bright. Moreover, the time required for motion determination can be halved compared to the case of claim 15.

  According to the invention of claim 17, the xy chromaticity of the pixel calculated from the R, G, B gradation values is plotted on the chromaticity diagram, and the point plotted in the white range is determined as the white pixel. If the ratio of the number of white pixels to the total number of pixels used for processing is equal to or greater than a predetermined ratio, it indicates that the area occupied by the white pixels with respect to all pixels to be processed has a certain width or more. By controlling the light source color so that it falls within the white range required for white (the range of deviation 0.02 from the black body radiation locus), it is possible to make a white object appear white.

  According to the invention of claim 18, the image sensor includes an XYZ filter approximating the CIE1931 color matching function, and the xy chromaticity is obtained at a plurality of points in the image using the image sensor with the XYZ filter. The xy chromaticity of each point is plotted on the chromaticity diagram, and the points plotted in the white range are determined as white pixels. If the ratio of the number of white pixels to the total number of pixels used for processing is equal to or greater than a predetermined ratio, it indicates that the area occupied by the white pixels with respect to all pixels to be processed has a certain width or more. By controlling the light source color so that it falls within the white range required for white (the range of deviation 0.02 from the black body radiation locus), it is possible to make a white object appear white.

  According to the nineteenth aspect of the present invention, if the ratio of the number of pixels determined to be white pixels is 20% or more with respect to the number of all or part of the image, it is determined that the subject is a white subject. By controlling the light source unit so that the light source color due to the mixed light of G and B falls within the range of the deviation 0.02 from the black body radiation locus, the white object can be displayed as white.

  According to the invention of claim 20, when the object changes, by always returning to the initial light mixture state and determining the color of the object, for example, when the object of the captured image has a large red component, By returning to the initial state, it is possible to cancel the state in which the red component is increased by the mixed lighting that makes red appear vividly, and it is possible to prevent control that makes the color of the object excessively bright. .

  According to the twenty-first aspect of the present invention, when the object is not changed, it is possible to prevent the control so that the color of the object becomes excessively bright.

Embodiments of the invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram showing a lighting device according to a first embodiment of the present invention. A configuration in which the blocks are arranged in the order of operation is shown.
The illumination device of the first embodiment shown in FIG. 1 is photographed by a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that photographs an object to be illuminated, and the image sensor 11. A calculation unit 12 that detects the position and color of each part of the object in the image and calculates a color distribution corresponding to the position on the object, and a color distribution corresponding to the position on the object obtained by the calculation And a control unit 13 that controls the color light of the light source unit 14.

With this configuration, the object to be illuminated is photographed by the image sensor 11, and the position and color of each part of the object in the photographed image are detected and calculated, and a plurality of parts included in each part of the object are calculated. It is possible to realize an illuminating device that controls the light source unit 14 so that the color of the light is vivid and preferable.
For example, if RGB light that has not been adjusted (for example, white balance is not adjusted) is emitted from the light source unit 14 to the object, the light is captured by the image sensor 11 and the color or color included in the captured image The component is detected by the calculation unit 12 so that the color or color component included in the object is vivid and deviates in a preferable direction.

  When the calculation is performed so that the color or color component included in the object is vivid and deviates in a preferred direction, the calculation unit 12 stores the RGB color and color component spectrum of the reference light source, and the stored reference By comparing the spectrum with the spectrum obtained by irradiating the RGB light from the unadjusted light source unit 14, the wavelength shift of the spectrum obtained by irradiating the RGB light from the unadjusted light source unit 14 is corrected, and the calculation unit 12 The calculation is made to correspond to the wavelengths of the RGB reference colors of the reference light source.

A projection projector may be used as the light source unit 14. By irradiating the target object with colored light corresponding to the color image obtained by photographing the target object with the image sensor 11 using the projection projector, the light that matches the position and color of the target object is accurately irradiated. The color component of the object can be reflected to make the object appear vivid.
By using a projection projector, in principle, the same image as the color image of the object photographed by the image sensor can be projected with the position corresponding to each part of the object. All colors of all parts of the object can be shown very vividly.

  When photographing an object, particularly a still life, the illumination light when photographing by the image sensor 11 is photographed by irradiating the object with light from another reference light source such as sunlight or an incandescent lamp, Alternatively, the target object is irradiated with light adjusted in white balance of the light source unit 14, and the arithmetic unit 12 detects the position and color of each part of the target object in the captured image, The color distribution corresponding to the position is calculated, and the control unit 13 controls the light source unit 14 to generate the color distribution corresponding to the position on the target object obtained by the calculation. Make sure to irradiate with the appropriate color light. If this is performed every time the object is changed, colored light that matches the color or color component of the object body can be generated and applied to the object.

FIG. 2 shows the operation steps of FIG. Three steps are shown: step S1 for obtaining a captured image by the image sensor 11, step S2 for image processing by the calculation unit 12, and step S3 for illuminating the object by the light source unit.
The image sensor 11 captures an object to be illuminated, detects the color of the pixel of the image by the calculation unit 12, and further matches the position of the object with a light color suitable for the object (for example, on the object). A light color having the same color distribution corresponding to the position) and irradiating the object.

  For example, when illuminating a dish as shown in Fig. 2, green vegetables are irradiated with light that emphasizes green (green light), and carrots and salmon meuniere are light that emphasizes orange (orange light). By irradiating the lemon with light that emphasizes yellow (yellow light) and irradiating the white dish with white light (white light), all the objects can be seen vividly or deliciously.

  According to the present embodiment, by irradiating the object with light that matches the color of the object to be illuminated, it is possible to show all colors of the object vividly and increase the color gamut area ratio. it can. That is, a plurality of colors included in the illuminated object can be shown vividly. By using the projection projector, it is possible to accurately irradiate light that matches the position and color of the object. Even if the object changes, the change is detected by the image sensor and processed in real time, so that the object can always be displayed vividly or deliciously following the change.

[Second Embodiment]
The block diagram of the illuminating device of the 2nd Embodiment of this invention is the same as that of FIG.
The illumination device according to the second embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and an object in an image captured by the image sensor 11. And a control unit for controlling the color light of the light source unit 14 to create the light color determined by the calculation unit 12. 13.

By configuring in this way, the object to be illuminated is photographed by the image sensor 11, the color of the object is detected and calculated, and which color component is included among a plurality of colors included in the object. It is possible to realize an illuminating device that controls the light source unit 14 so that the color can be seen vividly and preferably.
The light source unit 14 is a light source that mixes and emits light of at least three colors of red, green, and blue, but adds light mixed with red, green, and blue based on a white light source. May be.

FIG. 3 shows the color distribution of the light source color in the xy chromaticity diagram.
For example, when a light source having red, green, and blue light sources having the chromaticity plotted with reference symbols a, b, and c in FIG. 3 is used, the color inside the triangle connecting the three points a, b, and c is mixed. Can be created.

Next, a specific example using the xy chromaticity diagram will be described with reference to FIGS. FIG. 4 shows a sample image, and FIG. 5 shows a chromaticity plot example of the sample image.
The image sensor 11 includes an XYZ filter approximating a CIE1931 color matching function, and obtains xy chromaticity at a plurality of points in the image. The xy chromaticity of each point is plotted on a chromaticity diagram as shown in FIG. 3 (indicated by symbol e in FIG. 5), and the color with the most plots is detected from the range of each color name. In order to emphasize colors with many plots, the light source unit 14 is controlled to create a light color included in the color range by mixed light of red, green, and blue, and irradiate the object.

FIG. 5 is a diagram in which the xy chromaticity at a plurality of points taken at equal intervals in the range of the dotted line d is plotted in the sample image of FIG. Mark).
Here, since there are the most points that fall within the pink range, the object is irradiated by controlling to mix the red, green, and blue light so as to fall within the pink range.

It should be noted that, in the captured image, selection is made using an interface that can select only an object excluding a portion to be emphasized or a background (indicated by a dotted line d in FIG. 4), and points for obtaining xy chromaticity are individually set. By setting the selected range at the intersections of the grids at regular intervals, it is possible to make the color or object to be emphasized more vividly visible.
According to the present embodiment, by using an image sensor and mixing the light that matches the color of the object to be illuminated and irradiating the object, the object appears vividly even if the object changes. Is possible. An illumination environment in which the colors are emphasized can be created by vividly showing many of the color components included among the plurality of colors included in the object to be illuminated.

[Third Embodiment]
The block diagram of the illuminating device of the 3rd Embodiment of this invention is the same as that of FIG.
The illumination device shown in the third embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and an image captured by the image sensor 11. To detect the R, G, B gradation values of the pixels and calculate the light mixture ratio of the light source unit 14 according to the gradation values, and to reproduce the light mixture ratio determined by the calculation unit 12 And a control unit 13 that controls the color light of the light source unit 14.

The light source unit 14 is composed of a light source that mixes and emits light of at least three colors of red, green, and blue.
The image sensor 11 includes an RGB color filter.
The RGB gradation value of each pixel of the image photographed by the image sensor 11 is a value from 0 to 255. When R, G, and B are all 0, it is black, and when they are all 255, it is white. By determining the gradation value in this way, 8-bit representation digital signal processing is possible.

By averaging the gradation values for each of the R, G, and B pixels for the entire image, the ratio of the R, G, and B components included in the object can be obtained.
The mixing ratio of red, green, and blue light is determined according to the ratio of the R, G, and B gradation values.

  With this configuration, the object to be illuminated is photographed by the image sensor 11, and the RGB gradation value of each pixel is detected, thereby obtaining the ratio of the RGB components contained in the object. It is possible to realize an illumination device that controls the light source unit 14 so as to be seen vividly and preferably.

FIG. 6 is a diagram showing the relationship between the output of each color light source and the RGB gradation values of the detected image. FIG. 7 shows an example of a grid for detecting RGB gradation values.
In FIG. 6, the relationship between the RGB gradation values and the output of red, green, and blue light is to create white light by mixing red, green, and blue light, and output each color light when the brightest white color is obtained. 100 is set to 0, and 0 to 100 are assigned to gradation values 0 to 255.

Since it takes time to detect and calculate the RGB gradation values of all the pixels of the image, a method of shortening the processing time by appropriately dividing into grids as shown in FIG. 7 and detecting the gradation values at the intersection pixels May be implemented.
Further, the light source unit 14 may add red, green, and blue light based on white light at a light mixture ratio corresponding to the RGB gradation value of the image.
In the captured image, select using the interface that can select only the target object excluding the part or background to be emphasized, detect the RGB gradation value in the selected range, and adjust the color in the selected range. You may control a light source so that it may become a light ratio.

  According to this embodiment, the RGB gradation value of an image obtained by photographing an object to be illuminated is detected using an image sensor, and red, green, and blue light are turned on at a light mixture ratio corresponding to the RGB gradation value. By doing so, it is possible to create an illumination environment that emphasizes the color of the object. Even if the object changes, the object can be displayed vividly by processing in real time.

[Fourth Embodiment]
The block diagram of the illuminating device of the 4th Embodiment of this invention is the same as that of FIG.
The illumination device shown in the fourth embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and all images captured by the image sensor 11. Alternatively, calculating means for detecting R, G, B gradation values of some of the pixels and calculating a ratio of R, G, B gradation values for each pixel; and R, G, B for each of the calculated pixels Achromatic color determining means for determining whether each pixel is a chromatic color or an achromatic color based on a ratio of gradation values; and a white color determining means for distinguishing a white pixel from a gray pixel among the pixels determined to be an achromatic color; When the ratio of the number of pixels determined to be the white pixel is equal to or greater than a predetermined ratio with respect to the number of all or part of the image, the light source color due to R, G, B mixed light Control unit for controlling the light source unit 14 to fall within the range of deviation 0.02 from the black body radiation locus 13.

  In the present embodiment, the computing unit obtains the white ratio of the object irradiated with light based on the captured image. When the white ratio is above a certain level, the control unit recognizes that the white light source color is white so that the white object appears white (specifically, the deviation from the black body radiation locus is 0.02). Adjust the light so that it falls within the range.

  This is described in JIS Z 8725 as "correlated color temperature for chromaticity coordinates of a light source within a deviation of about 0.02 from the black body radiation locus on the CIE1960UCS chromaticity diagram" Based on. That is, a light source with a deviation within 0.02 can be regarded as white light.

  FIG. 8 is a partially enlarged view of the CIE1960USC chromaticity diagram and represents a range of deviation 0.02 from the black body radiation locus on the chromaticity diagram. A range indicated by reference characters B and C with the black body radiation locus A as the center is a range with a deviation of 0.02.

FIG. 9 shows a specific algorithm for image processing and light source color control of the calculation unit and the control unit.
In step S1, a pixel used for processing is selected from the captured image. This is because processing the entire pixel of the captured image takes processing time, so in order to reduce the time, for example, a grid of 10 pixels (see FIG. 7) is created and the intersection is selected as a pixel to be processed, This is a process for reducing the number of pixels to be processed, such as selecting only the central area.

In step S2, the R, G, B gradation values of each pixel to be processed are acquired.
In step S3, the ratio of R, G, B gradation values is obtained for each pixel. When the R, G, and B gradation values of one pixel are R, G, and B, respectively, the ratios of the R, G, and B gradation values are R / (R + G + B), G / (R + G + B), and B / (R + G + B). Is obtained by calculating.
In step S4, if all the ratios of R, G, and B of a pixel exceed 30%, the pixel is determined to be an achromatic color.

In step S5, the average of the R, G, B gradation values of the pixels determined to be achromatic is calculated.
In step S6, if the average gradation value of R, G, B of the achromatic pixel is 200 or more (when all gradations are 0 to 255) or the input reference value or more, it is determined as a white pixel.
In step S7, if the ratio of white pixels to all pixels used in the processing is equal to or greater than a certain ratio, control is performed so that the light source color due to R, G, B mixed light falls within the range of deviation 0.02 from the black body radiation locus. To do.

FIG. 10 shows an image obtained by photographing an achromatic color chart and a chromatic color chart. (a) is an achromatic color chart, and (b) is a chromatic color chart. The achromatic color of (a) is black with the lowest gradation at the right end, and the gradation value gradually increases from dark gray to light gray toward the left.
The area 1 of the color chart in FIG. 10A is gray having a reflectance of 40%, and the average gradation value of R, G, B in this area 1 is 195. On the other hand, the area 2 of the color chart in FIG. 10B is a white color chart, but the average gradation value of R, G, B in this area 2 is 230.

Therefore, in step S6 of the algorithm of the calculation unit, it is preferable to determine pixels having an average gradation value of 200 or more as white.
However, the average gradation value of R, G, and B may not be 200 or more depending on the shooting situation and the characteristics of the image sensor, even though it is actually a white object. In that case, even if the reference value for judging that the pixel is white is corrected by inputting the numerical value of the reference gradation value or by inputting the white area and calculating the gradation value. good.

For example, FIG. 11 shows an example in which a dish is photographed by an image sensor. In the image of FIG. 11, the plate and table portions are white, and the ratio of the white area is about 20% with respect to the entire image.
Therefore, in step S7 of the algorithm of the calculation unit and the control unit, the ratio of white pixels to all pixels used for processing is preferably set to about 20%.

However, it is equipped with an input means that can be changed by entering a numerical value if the effect of making the object look vivid is not obtained if it is set to 20%, such as when a photographed image shows a white wall or furniture. Also good.
Also, the light source is based on white light, and red, green, and blue light may be added at a dimming ratio according to the RGB gradation value of the image, compared to a case where only monochromatic light is mixed. This makes it easy to make white objects appear white.

FIG. 12 shows an example of a method of making a white object appear white in an illumination environment based on R, G, and B gradation values obtained for each pixel.
The image sensor 11 is used to detect R, G, B gradation values of an image obtained by photographing an object to be illuminated, and red, green, blue light with a dimming ratio corresponding to the R, G, B gradation values. By turning on, it is possible to create an illumination environment that emphasizes the color of the object.

  In such an illumination environment, when there are many specific color light components, if there is a white part in the object, it appears that the white part is colored. Therefore, when a white object exists in an object with a certain area or more, red, green, and blue light are mixed at a dimming ratio according to the R, G, and B gradation values. By controlling the light source unit 14 so that the chromaticity coordinates of the emitted light color fall within a range of deviation 0.02 from the black body radiation locus in the process of the algorithm of FIG. It can be shown as white.

  First, the ratio of R, G, and B components contained in the object is obtained by averaging the R, G, and B gradation values for each pixel for the entire image with the illumination device having the same configuration as that in FIG. The light source unit 14 is controlled by determining the mixing ratio of red, green, and blue light according to the ratio of the R, G, and B gradation values. As a result, the light source unit 14 illuminates red, green, and blue light at the gradation level shown in FIG. 12A with the dimming ratio according to the R, G, and B gradation values of the image, and irradiates the object. The object is irradiated with white light from an RGB light source (also called a three-wavelength light source) having a 1: 1: 1 ratio of R, G, and B color light separately prepared while maintaining the illumination state. By doing so, white light is increased as shown in FIG. 12B to raise the so-called R, G, and B color lights, and within the range of deviation 0.02 from the black body radiation locus in the process of the algorithm of FIG. The white light of the RGB light source is increased until it enters. In this way, the ratios of the R, G, and B color components approach the same, but the object is illuminated while highlighting each color component of the object while maintaining the difference between the R, G, and B color components. In addition, it is possible to make a white object stand out as white.

  In addition to the light source unit 14, it has been described that a separately prepared RGB light source having a ratio of R, G, and B color light of 1: 1: 1 is used, but the same light source unit is used without using a separately prepared RGB light source. 14, the R, G, B color components of the light source unit 14 are switched from the state shown in FIG. 12 (a) to the state shown in FIG. 12 (b), so that the R, G, B components of the object are changed. It is also possible to make the white stand out while making it stand out.

Therefore, by controlling the light source unit 14 by executing the algorithm shown in FIG. 9 from the illumination state shown in FIG. 12A, white light is increased as shown in FIG. It becomes possible to make it stand out.
In the second to fourth embodiments, a projection projector may be used as the light source unit.

In the first to fourth embodiments described above, the object to be illuminated is photographed by the image sensor, the position and color of the object are detected and calculated, and a plurality of colors included in the object are vivid and preferable directions. It was an illuminating device that appropriately adjusts a plurality of color lights so as to shift to, and irradiates an object.
Incidentally, the first to fourth embodiments have the following problems.

In this way, the lighting device repeats the process of taking an image of an object → color analysis of the image → determining the dimming rate of red, green, and blue light → mixing and irradiating → image taking → When changes, the light color is changed according to the object, and the color of the object can be shown vividly.
However, if the object illuminated by the illumination is not moving, the process of image capture of the object → color analysis of the image → determination of the dimming rate of red, green and blue light → mixed light irradiation → image capture ... If it repeats, for example, if there are many red parts in an object, the dimming rate of red light will be made high and the red part of an object will be shown more vividly.

  If an image of the object is taken again in this state, the red component is increased, and therefore the dimming rate of red light is further increased. If this is repeated, the ratio of red light will increase and red light will be emitted, and the appearance of other colors will deteriorate.

[Fifth Embodiment]
The configuration of the illumination device according to the fifth embodiment of the present invention is the same as that shown in FIG.
The illumination device shown in the fifth embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and each pixel in an image captured by the image sensor 11. A first storage unit that holds the R, G, and B gradation values of each pixel; the position of each pixel in the next photographed image; and the R, G, and B gradations of each pixel A second storage unit that calculates and holds a difference value between the value and the R, G, and B gradation values of each pixel at the time of previous shooting; an nth (n is an integer of 1 or more) difference value and an (n + 1) th Means for comparing the difference value and detecting the movement of the object to be illuminated; and when the object does not move from the comparison result, the arithmetic unit 12 that maintains the dimming state at that time; A control unit 13 for controlling the color light of the light source unit 14 in accordance with the color components distributed on the object obtained by the calculation unit 12; It is equipped with a.

  In the present embodiment, when an object is changed by continuously capturing images, the light is irradiated with red, green, and blue light at a dimming rate suitable for the object. Maintain dimming rate.

The light source unit 14 is composed of a light source that mixes and emits light of at least three colors of red, green, and blue. Further, based on a white light source, light mixed with red, green, and blue may be added. The white light source serving as the base at this time refers to the case where the ambient light, that is, sunlight, or the illumination light source serving as another background in the room is a white fluorescent light source.
The means for detecting the motion of the target object continuously captures images of the target object and compares the differences of the R, G, and B gradation values.

The operation of the fifth embodiment will be described in detail below.
FIG. 13 is a flowchart showing the operation of the illumination device of the fifth embodiment. Of steps S11 to S16, step S11 is the operation of the image sensor 11, steps S12 to S15 are the operation of the calculation unit 12, and step S16 is the operation of the control unit 13.
First, an object is illuminated with a standard red / green / blue light mixture ratio, and an image of the object is taken by the image sensor 11 (step S11). The captured image signal is sent to the calculation unit 12.

  The calculation unit 12 performs color analysis of the image (step S12), and then detects a change in the object by difference calculation (step S13).

When a change in the object is detected, a dimming rate suitable for the object is calculated (step S14), and the control unit 13 controls the light source unit 14 according to the calculated dimming rate to control red, green, Irradiate with blue light (step S16). If no change in the object is detected, the dimming rate at that time is maintained (step S15).
It should be noted that the change detection of the object by the difference calculation in step S13 is a dimming cycle every time a fixed time elapses as shown in FIG. Whether the object has moved by calculating the difference between the three images (1), (2), and (3) taken in the same period as the light ratio) If it is not moving, the dimming rate at that time is maintained. When it is determined that there is movement, the light source unit 14 is controlled so that the object is irradiated with light source light at the dimming rate at the time of the determination, and the color of the object appears vividly.

First, the object is irradiated with the first illumination light (initial value: color light whose mixing ratio is known in advance). As a result of taking an image of the object (image (1)) and analyzing the color of the image (1), the dimming rate is determined and the mixed light is irradiated.
After that, when a certain time (for example, 1 second or several seconds) may elapse and the color of the image (2) obtained by photographing the object is analyzed again, the R of each pixel of the image (2) and the image (1) is analyzed. , G, B gradation value differences are calculated, and pixel positions and differences are stored. The pixel position and difference at this time are stored in the first storage unit in the calculation unit 12. The dimming rate is determined from the result of analyzing the color of the image (2), and the mixed light from the light source unit 14 is emitted.

  Next, the color of the image (3) obtained by photographing the object is analyzed, the difference between the R, G, B gradation values of each pixel of the image (3) and the image (2) is calculated, and the pixel position and difference are calculated. And stored in the second storage unit in the calculation unit 12. Then, the difference between the image (2) and the image (1) is compared with the difference between the image (3) and the image (2). Since each difference is a difference between two images at a constant time interval, each difference can be called a difference image, and the comparison is made by taking the difference between the two difference images.

  Therefore, if the positions of the two compared difference images have not changed, the difference value between the two differences is almost 0, and it is determined that the image has not moved, and the dimming rate at that time is maintained.

  When the position of the two difference images compared has changed, the difference value of the two differences has a certain value, and is judged to be moving, and the dimming rate of each color maintained when not moving As a result of irradiating the object with light in the state and taking an image of the object with the image sensor 11 and analyzing the color of the image, a new dimming rate is determined, and the light mixed according to the dimming rate is mixed. Irradiated.

  In this way, by taking the difference between the difference images using the three images (1), (2), and (3), the change in the image data due to the change in the dimming rate can be subtracted, so only the change in the object. Can be detected.

  In addition, the difference value is not taken and compared only for one specific pixel, but the difference is calculated for each pixel at the same position for all the pixels on the screen or a predetermined range of pixels. Take a comparison. If the difference between the first and second difference values for each pixel is added for all or some of the pixels, and the sum of the differences for all or some of the captured images is smaller than the threshold value, the target It is determined that the object is not moving, and the dimming rate at the time of determination is kept (maintained). If the object moves, there will be a shift in the position of both difference images. Therefore, if the difference between the difference values is taken and the difference is larger than a predetermined threshold value, it can be determined that the object has moved.

  FIG. 15 shows an example of a difference image. Taking, for example, a red (R) apple as an object, an image taken as images (1), (2), and (3) over time will be described. The dimming rate of red light is increased by the calculation unit 12 between the image (1) and the image (2) and between the image (2) and the image (3). This is because the red light increases in the order of the images (1), (2), and (3) with the passage of time because the above-described control for vividly displaying the colors is performed. Therefore, in order to detect the movement of the object, the difference image 1 of the image (2) -image (1) is compared with the difference image 2 of the image (3) -image (2), and the two difference images are compared. A difference value is taken, and if the difference value is smaller than a predetermined threshold value, it is determined that the object has not moved, and if the difference value is equal to or greater than the threshold value, it is determined that the object has moved. When there is no movement in the object, the difference value between the two difference images is a value close to 0, but when there is movement in the object, the position of one of the two difference images is shifted. When the difference value between the two difference images is calculated, the difference value has a certain value exceeding the threshold value.

  When the R difference image 1 of the image (1) and the image (2) and the R difference image 2 of the image (2) and the image (3) are compared, the positions of the difference images are almost the same. And the R difference image 2, the calculation unit 12 determines that there is no movement.

  And when it determines with there being no motion, the calculating part 12 maintains the light control rate at the time of the determination. When it is determined that there is movement, the control unit 13 dimmes red, green, and blue light at a dimming rate that is maintained when there is no movement.

  FIG. 16 illustrates the operation of the illumination device according to the fifth embodiment. The image sensor 11 has three images (1), (2), (3 ). For example, a case where a red (R) apple is used as an object will be described. At time t1, the object is irradiated with colored light at an initial dimming rate, and this is photographed by the image sensor 11 to obtain an image (1). The photographed R, G, B gradation values are applied to the object. A light mixture ratio (also referred to as a dimming ratio for each color) of color light corresponding to the included color components is determined. The control unit 13 starts dimming control for each color light source of the light source unit 14 using the light mixture ratio as a target value. The light source unit 14 reaches the target dimming rate (eg, the red dimming rate on the vertical axis) corresponding to the time t2 on the horizontal axis in the time period up to the time t2, and the image sensor 11 takes an image at the time t2. Perform image (2). Then, the difference between the image (2) and the image (1) is taken and stored as a first difference image. Similarly, at time t3 after the next dimming cycle elapses, the image sensor 11 is photographed to obtain the image (3), and the difference between the image (3) and the image (2) is taken as a second difference image. Remember. Then, the difference between the second difference image and the first difference image is calculated, and the movement of the object is determined by determining the magnitude of the calculated value with respect to the threshold value. As a result of the motion determination, if there is no motion, the red dimming rate at the time of the determination is maintained as indicated by a two-dot chain line in the figure.

  Thereby, for example, when there is a lot of red, it is possible to prevent a problem that the dimming rate of red gradually increases. As a result of determining that there is no movement of the object, even if the dimming rate at the time of determination is maintained, it is still possible to shoot images after that at regular intervals. Since the dimming rate is maintained as long as the object does not move, the difference from the next photographed image and the difference from the next photographed image are also zero, so the dimming rate is constant when the object does not move. Maintained.

  According to the fifth embodiment, the image sensor is used to detect the R, G, B gradation values of the image of the object to be illuminated, and the light control according to the R, G, B gradation values. By lighting red, green, and blue light at a ratio, an illumination environment that emphasizes the color of the object can be created. By photographing the object in real time, it is possible to show the object vividly even if the object changes. When the object is not changed, it is possible to prevent the control so that the color of the object becomes excessively bright.

[Sixth Embodiment]
The configuration of the illumination device according to the sixth embodiment of the present invention is the same as that shown in FIG.
The sixth embodiment is an embodiment that should be called a modification of the fifth embodiment.

  The illumination device shown in the sixth embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and each pixel in an image captured by the image sensor 11. A first storage unit that holds the R, G, and B gradation values of each pixel; the position of each pixel in the next photographed image; and the R, G, and B gradations of each pixel A second storage unit that calculates and holds a difference value between the value and the R, G, and B gradation values of each pixel at the time of previous shooting; an nth (n is an integer of 1 or more) difference value and an (n + 1) th Means for comparing the difference value and detecting the movement of the object to be illuminated; and when the object does not move from the comparison result, the arithmetic unit 12 that maintains the dimming state at that time; A control unit 13 for controlling the color light of the light source unit 14 in accordance with the color components distributed on the object obtained by the calculation unit 12; It is equipped with a.

  FIG. 17 illustrates the operation of the illumination device according to the sixth embodiment. The image sensor 11 has three images (1), (A), (2 ). For example, a case where a red (R) apple is used as an object will be described. At time t1, the object is irradiated with colored light at an initial dimming rate, and this is photographed by the image sensor 11 to obtain an image (1). The photographed R, G, B gradation values are applied to the object. A light mixture ratio (also referred to as a dimming ratio for each color) of color light corresponding to the included color components is determined. The control unit 13 starts dimming control for each color light source of the light source unit 14 using the light mixture ratio as a target value. The light source unit 14 is controlled so as to reach a target dimming rate (for example, a red dimming rate on the vertical axis) corresponding to the time t2 on the horizontal axis in the passage of time up to the time t2. Photographing is performed by the image sensor 11 at a time ta in the middle of light control (half of the light control cycle) until the time t2 is reached, and a captured image (A) is acquired. Then, the difference between the image (A) and the image (1) is taken and stored as a first difference image. Similarly, when the time t2 after the elapse of the remaining half of the dimming period is reached, the image sensor 11 is photographed to obtain the image (2), and the difference between the image (2) and the image A is obtained. And stored as a second difference image. Then, the difference between the second difference image and the first difference image is calculated, and the movement of the object is determined by determining the magnitude of the calculated value with respect to the threshold value.

  As described above, according to the sixth embodiment, it is only necessary to obtain two difference images. Therefore, by taking one image in the middle of the dimming cycle during dimming, it is already possible to perform dimming. If one image is taken, two difference images (A) and (1), and two difference images (2) and (A) are obtained. If it is determined that there is no light and the dimming rate at the time of (2) is kept (indicated by a two-dot chain line in the drawing), the time required for motion determination can be halved compared to the fifth embodiment. .

[Seventh Embodiment]
The configuration of the illumination device of the seventh embodiment of the present invention is the same as that of FIG.
The illumination device shown in the seventh embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and all images captured by the image sensor 11. Alternatively, calculation means for calculating xy chromaticity from R, G, B gradation values of some of the pixels; white determination for distinguishing whether each pixel is a white pixel based on the calculated xy chromaticity for each pixel R, G, B mixed when the ratio of the number of pixels determined to be the white pixel is equal to or greater than a predetermined ratio with respect to the total number of pixels or a part of the image. And a control unit 13 for controlling the light source unit 14 so that the light source color by light falls within the range of the deviation 0.02 from the black body radiation locus.
The seventh embodiment of the present invention corresponds to another embodiment related to the fourth embodiment.

In the present embodiment, for example, the R, G, B gradation values are linearly converted to the CIE1931xyz color space, and the entire image or the R, G, B gradation values of a plurality of points in the area of the object to be displayed vividly are obtained. Convert to tristimulus values X, Y, Z and calculate xy chromaticity.
The relational expression between RGB value and xy value is
x = 0.6R-0.28G-0.32B
y = 0.2R-0.52G + 0.31B
Then, the xy chromaticity of the pixel calculated from the R, G, B gradation values is plotted on the chromaticity diagram shown in FIG. 3, and the point plotted in the white range is determined as a white pixel.
The operations after the determination of the white pixel are the same as in the fourth embodiment of the present invention.

  If the ratio of the number of white pixels to the total number of pixels used for processing is equal to or greater than a predetermined ratio, it indicates that the area occupied by the white pixels with respect to all the pixels to be processed has a certain width or more. By controlling the light source color so that it falls within the white range necessary for white on the degree diagram (the range of deviation 0.02 from the black body radiation locus), a white object can be shown as white.

  FIG. 8 is a partially enlarged view of the CIE1960USC chromaticity diagram as described in the fourth embodiment, and represents a range of deviation 0.02 from the black body radiation locus on the chromaticity diagram. A range indicated by reference characters B and C with the black body radiation locus A as the center is a range with a deviation of 0.02.

  In this way, the calculation unit 12 obtains the white ratio of the object irradiated with light based on the captured image. When the ratio of white is equal to or greater than a certain value, the control unit 13 determines a range in which the mixed light source color is recognized as white so that the white object appears white (specifically, a deviation 0.02 from the black body radiation locus). Adjust the light so that it falls within the range.

  This is described in JIS Z 8725 as "correlated color temperature for chromaticity coordinates of a light source within a deviation of about 0.02 from the black body radiation locus on the CIE1960UCS chromaticity diagram" Based on. That is, a light source with a deviation within 0.02 can be regarded as white light.

  According to the seventh embodiment, the xy chromaticity of the pixel calculated from the R, G, B gradation values is plotted on the chromaticity diagram, and the point plotted in the white range is determined as the white pixel. If the ratio of the number of white pixels is equal to or greater than the predetermined ratio, the white area of the object is greater than or equal to a certain value. Therefore, within the white range necessary for white on the chromaticity diagram (with a deviation of 0.02 from the black body radiation locus) By controlling the light source color so as to enter, the white object can be shown as white.

[Eighth Embodiment]
The configuration of the lighting apparatus according to the eighth embodiment of the present invention is the same as that shown in FIG.
The illuminating device shown in the eighth embodiment includes a light source unit 14 that can emit at least red, green, and blue light, and an XYZ filter that approximates a CIE1931 color matching function, and an image sensor 11 that captures an object to be illuminated. And measuring means for measuring the xy chromaticity of all or part of the image captured by the image sensor 11; and distinguishing whether each pixel is a white pixel based on the measured xy chromaticity of each pixel R, G when the ratio of the number of pixels determined to be a white pixel is equal to or greater than a predetermined ratio with respect to the total number or a part of the number of pixels of the image. , B, and a control unit 13 for controlling the light source unit 14 so that the light source color due to the mixed light falls within the range of the deviation 0.02 from the black body radiation locus.
The eighth embodiment of the present invention corresponds to another embodiment related to the fourth embodiment.

In the present embodiment, the image sensor includes an XYZ filter that approximates the CIE1931 color matching function, and the xy chromaticity is obtained at a plurality of points in the image using the image sensor with the XYZ filter. The xy chromaticity of each point is plotted on the chromaticity diagram shown in FIG. 3, and the points plotted in the white range are determined as white pixels.
The operations after the determination of the white pixel are the same as in the fourth embodiment of the present invention.

  If the ratio of the number of white pixels to the total number of pixels used for processing is equal to or greater than a predetermined ratio, it indicates that the area occupied by the white pixels with respect to all the pixels to be processed has a certain width or more. By controlling the light source color so that it falls within the white range necessary for white on the degree diagram (the range of deviation 0.02 from the black body radiation locus), a white object can be shown as white.

  According to the eighth embodiment, the image sensor includes an XYZ filter approximating the CIE1931 color matching function, and the xy chromaticity is measured at a plurality of points in the image using the image sensor with the XYZ filter, The xy chromaticity of the point is plotted on the chromaticity diagram, and the point plotted in the white range is determined as a white pixel. If the ratio of the number of white pixels is equal to or greater than the predetermined ratio, the white area of the object is greater than or equal to a certain value. Therefore, within the white range necessary for white on the chromaticity diagram (with a deviation of 0.02 from the black body radiation locus) By controlling the light source color so as to enter, the white object can be shown as white.

[Ninth Embodiment]
The configuration of the illumination device of the ninth embodiment of the present invention is the same as that shown in FIG.
The illumination device shown in the ninth embodiment includes a light source unit 14 that can emit at least red, green, and blue light, an image sensor 11 that captures an object to be illuminated, and a mixed light of each light source color of the light source unit 14. Means for setting an initial value of the ratio; means for detecting a change in the object over time based on a gradation value of each pixel of the image photographed by the image sensor 11; when a change in the object is detected Means for returning the light mixture ratio to an initial value, and detects an R, G, B gradation value of each pixel of an image photographed in the light mixture state at the initial value, and a light source according to the gradation value. The calculation unit 12 that calculates the light mixture ratio of the unit 14 and the control unit 13 that controls the color light of the light source unit 14 according to the color components distributed on the object obtained by the calculation unit 12 are provided.

  The present embodiment includes means capable of previously setting an initial value of the light mixture ratio in the light mixture of the light sources of the respective light colors of the light source unit 14, and the light mixture ratio is, for example, a correlated color temperature of 3000 K (corresponding to a light bulb color). ).

  The image sensor 11 continuously captures images. However, when a change in the object is detected, the control unit 13 adjusts the light source of each light color of the light source unit 14 so that the initial value of the light mixture ratio is obtained. Shine. Here, the change in the object refers to a change in which the object moves or is replaced over time. For example, the initial value of the light mixture ratio is set in advance so that a plurality of correlated color temperatures can be obtained, or the light mixture ratio is set to be a light color such as a light bulb color, daylight white, daylight color, and the like. You may choose from among them.

  Further, an image is taken in an initial light mixture state, color information of an object is acquired from R, G, and B gradation values of all or some of the pixels in the initial light mixture state, and a light mixture ratio is calculated. The light source of each light color is dimmed so that the light mixture ratio suitable for the object is obtained. That is, the dimming rate of each light color of the light source unit 14 is changed.

When the object is changed, it is always returned to the initial light mixture state, and then the dimming rate of each light color is controlled so that the light mixture state suitable for the object is obtained.
If no change in the object is detected, the light mixture ratio is maintained until the next change in the object is detected. That is, the dimming rate of each light color of the light source unit 14 is maintained as it is.

  For example, the change is detected by calculating a difference between specific gradation values (for example, G gradation value in order to see only the brightness) of two consecutively photographed images, and the difference value is determined in advance. It is determined whether or not there is a change in the object depending on whether or not it is smaller than the threshold value. That is, as the time elapses, the difference in the gradation value between the current image and the previous image is calculated, and the change in the object is determined by whether or not the difference value exceeds a predetermined threshold value. To detect. Alternatively, as a method for detecting a change in the object, as in the fifth and sixth embodiments of FIGS. 13 to 17, the difference value between two difference images is compared from the images of three images. You may determine the change of an object.

  In this embodiment, when the object changes, the R, G, B gradation values of each pixel are detected from the image captured in the initial light mixture state, and the light mixture ratio is calculated and calculated. The light source unit is controlled based on the light mixture ratio. If no change is observed, the light mixture ratio when it is determined not to change is maintained (in other words, the light mixture ratio is fixed), and the light mixture ratio is maintained until the next change is recognized. To maintain.

  According to the ninth embodiment, when the object changes, by always returning to the initial light mixing state and determining the color of the object, for example, when the object of the photographed image has a large red component, By returning to the initial state, it is possible to cancel the state in which the red component is increased by the mixed illumination that makes red look vivid as in the first to fourth embodiments, and the color of the object is excessive. It is possible to prevent the control from becoming vivid.

  In the ninth embodiment, the initial light mixture state and the light mixture state suitable for the object appear alternately, and when the object frequently changes, the light color changes frequently, There is a possibility that it will be a restless space.

  For this reason, control is made so that the light color does not change suddenly, such as a restriction that the light color does not change within a certain time interval, a gradual change continuously, or a change over 1 second. You may go. For example, when the meal content on the table changes with time, such as when eating at a restaurant, it is preferable to control the color of the illumination light to change gradually.

  The present invention is not limited to food and other stores and households, but can be applied to illuminate the objects vividly when illuminating all objects including indoors and outdoors.

The block diagram which shows the illuminating device of the 1st Embodiment of this invention. The figure which shows the operation | movement step in 1st Embodiment. The figure which shows color distribution of the light source color in xy chromaticity diagram used for the illuminating device of the 2nd Embodiment of this invention. The figure which shows the sample image used for the 2nd Embodiment of this invention. The figure which shows the chromaticity plot example of the sample image of FIG. The figure which shows the relationship between the output of each color light source, and the RGB gradation value of the detected image used for the illuminating device of the 3rd Embodiment of this invention. The figure which shows the example of the grid which detects RGB gradation value. The elements on larger scale of the chromaticity diagram which show the range within 0.02 of deviation from the black body radiation locus used for the illuminating device of the 4th Embodiment of this invention. The figure which shows the image processing algorithm of a calculating part and a control part. The figure which shows the color chart of an achromatic color and a chromatic color. The figure which shows the example which image | photographed cooking with the image sensor. The figure explaining the operation example of the illuminating device of the 4th Embodiment of this invention. The flowchart explaining operation | movement of the illuminating device of the 5th Embodiment of this invention. The figure explaining the difference calculation of the image in a calculating part. The figure explaining the example of the difference image as an operation example of the illuminating device of the 5th Embodiment of this invention. The figure explaining the operation | movement of the illuminating device of the 5th Embodiment of this invention in the example in the case of acquiring three images with two light control periods. The figure explaining the example in case the operation | movement of the illuminating device of the 6th Embodiment of this invention acquires three images by one light control period.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Image sensor 12 ... Operation part 13 ... Control part 14 ... Light source part

Claims (21)

A light source unit capable of emitting at least red, green and blue light;
An image sensor that captures an object illuminated by the light source;
A calculation unit for calculating a color component distributed on the object based on the photographed image;
A control unit that controls the color light of the light source unit according to the color component distributed on the object obtained by the calculation unit;
An illumination device comprising: The calculation unit calculates a color distribution corresponding to the position of each part of the object in the captured image,
The lighting device according to claim 1, wherein the control unit controls the light source unit to generate a color distribution corresponding to the position on the object obtained by the calculation unit. The calculation unit detects the color of the object in the captured image, determines the color that is contained most in the object,
The lighting device according to claim 1, wherein the control unit controls the light source unit to create a light color determined by the calculation unit.   The lighting device according to claim 1, wherein the image sensor includes a filter that approximates an XYZ color matching function. The calculation unit detects R, G, B gradation values of each pixel in the photographed image, calculates a light mixture ratio in the light source unit according to the gradation values,
The lighting device according to claim 1, wherein the control unit controls the light source unit to reproduce the light mixture ratio determined by the calculation unit.   The lighting device according to claim 1, wherein the image sensor includes an RGB color filter.   7. The apparatus according to claim 3, further comprising means for selecting only a portion to be emphasized or a portion excluding the background as a target portion in a photographed image, and enabling enhancement of colors within the selected range. The lighting device according to any one of the above.   The lighting device according to claim 1, wherein the light source unit is a projection projector. The computing unit is
Calculating means for detecting R, G, B gradation values of all or some of the pixels of the image taken by the image sensor and calculating a ratio of the R, G, B gradation values for each pixel;
Achromatic color determining means for determining whether each pixel is a chromatic color or an achromatic color based on the calculated ratio of R, G, B gradation values for each pixel;
White determination means for distinguishing white pixels from gray pixels among pixels determined to be achromatic, and
The controller is
When the ratio of the number of pixels determined to be white pixels is equal to or greater than a predetermined ratio with respect to the number of all or part of the image, the light source color due to R, G, B mixed light is deviated from the black body radiation locus. The lighting device according to claim 5, wherein the light source unit is controlled to fall within a range of 0.02. The achromatic color determining means determines an achromatic color if the ratio of each of the R, G, B gradation values for each pixel in the calculating means is equal to or greater than a predetermined ratio,
The white determination means calculates an average gradation value of R, G, B gradation values of pixels determined as an achromatic color by the achromatic color determination means, and the average gradation value is equal to or greater than a predetermined gradation value or in advance. If it is more than the set reference value, it is determined as a white pixel,
If the ratio of the number of pixels determined as the white pixel is equal to or greater than a predetermined ratio with respect to the number of all or a part of the image, the control unit emits a light source color due to R, G, and B mixed light to a black body. It controls so that it may enter in the range of deviation 0.02 from a locus | trajectory, The illuminating device of Claim 9 characterized by the above-mentioned.   The predetermined ratio in the achromatic color determination means is 30%, the predetermined gradation value in the white determination means is 200 (when all gradations are 0 to 255), and the predetermined ratio in the control unit is 20%. The lighting device according to claim 10.   The at least one of the predetermined ratio in the achromatic color determination unit, the predetermined gradation value in the white determination unit, and the predetermined ratio in the control unit can be variably set. 11. The illumination device according to 11. The computing unit is
A first storage unit that holds the position of each pixel in the image captured by the image sensor and the R, G, and B gradation values of each pixel;
The position of each pixel in the image taken next and the R, G, B gradation value of each pixel and the difference value of the R, G, B gradation value of each pixel at the previous photographing are calculated and held. A second storage unit;
means for comparing the nth (n is an integer greater than or equal to 1) difference value and the (n + 1) th difference value to detect the movement of the illuminated object;
The lighting device according to claim 5, wherein the dimming state at that time is maintained when the object does not move from the comparison result.   The means for detecting the movement of the object obtains a difference between the (n + 1) th difference value and the nth difference value, and determines the movement of the object based on whether or not the obtained difference is smaller than a predetermined threshold value. The lighting device according to claim 13.   The illuminating device according to claim 13 or 14, wherein photographing of an image by the image sensor is performed every time the light mixture ratio determined by the calculation unit is reproduced.   The illuminating device according to claim 13 or 14, wherein the imaging of the image by the image sensor is performed during and every time the light mixture ratio determined by the calculation unit is reproduced. The computing unit is
Calculating means for calculating xy chromaticity from R, G, B gradation values of all or a part of each pixel of an image taken by the image sensor;
White determination means for distinguishing whether each pixel is a white pixel based on the calculated xy chromaticity for each pixel;
The controller is
When the ratio of the number of pixels determined to be white pixels is equal to or greater than a predetermined ratio with respect to the number of all or part of the image, the light source color due to R, G, B mixed light is deviated from the black body radiation locus. The lighting device according to claim 5, wherein the light source unit is controlled to fall within a range of 0.02. The image sensor includes an XYZ filter approximating a CIE1931 color matching function,
The computing unit is
Measuring means for measuring the xy chromaticity of each or all of the pixels of the image taken by the image sensor;
White determination means for discriminating whether each pixel is a white pixel based on the measured xy chromaticity for each pixel;
The controller is
When the ratio of the number of pixels determined to be white pixels is equal to or greater than a predetermined ratio with respect to the number of all or part of the image, the light source color due to R, G, B mixed light is deviated from the black body radiation locus. The lighting device according to claim 5, wherein the light source unit is controlled to fall within a range of 0.02.   The lighting device according to claim 17 or 18, wherein the predetermined ratio is 20%. The computing unit is
Means for setting an initial value of the light mixture ratio of each light source color of the light source unit;
Means for detecting a change in the object over time based on a gradation value of each pixel of the image captured by the image sensor;
Means for returning the light mixture ratio to an initial value when a change in the object is detected;
6. The light mixture ratio of a light source unit is calculated according to the gradation value by detecting R, G, B gradation values of each pixel of an image photographed in a light mixture state at an initial value. The lighting device described.   The means for detecting the change of the object over time calculates a difference between an n + 1th difference value (n is an integer equal to or greater than 1) and an nth difference value, and the difference is determined from a predetermined threshold value. 21. The illumination device according to claim 20, wherein a change in the object is detected based on whether the object is small.

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