JP2008148329A - Color reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color reproducing apparatus capable of performing color reproduction on which an output profile is operated easily even when offset light or external light at a photographing place is varied. <P>SOLUTION: The color reproducing apparatus reads a tone curve from a tone curve storage means on the basis of conditions detected by a condition detecting means, γ correction by a γ correction calculating means is performed, and accurate color reproduction is performed on an image display device for displaying an image thereon in accordance with an input signal value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a color reproduction device that accurately outputs the color of an image of an object photographed by an image input device to an output device.

  Conventionally, various attempts have been made to bring the color displayed on a printed matter or a TV monitor as close as possible to the color visually recognized by humans.

  With recent advances in computer performance and miniaturization and the spread of DTP systems (desktop publishing, electronic publishing), color matching technology that matches the display color displayed on the TV monitor and the color of the printed material to be input / output (for example, Patent Document 1, Patent Document 2, etc.) have been proposed.

  In a CMS (color management system) representing this color matching technology, for example, a color correction unit 3 is provided between the image input device 1 and the image output device 2 as shown in FIGS. Side) and image output side (observation side) have an input profile 4 and an output profile 5, respectively, and once converted to a color independent of the image input device 1 and the image output device 2 (hereinafter referred to as device independent color). After that, input / output color matching is performed.

  Further, in Patent Document 3, as shown in FIG. 34, an image taken at a remote location or the like different from the location to be reproduced is transmitted, color matching is performed with a spectrum, and reproduction (display, display, accurate color reproduction) is performed. A color image recording / reproducing system for printing) has been proposed.

  This is the same as when a multispectral image of an object is photographed on the photographing side and the object is photographed under illumination light on the reproduction side using the illumination spectrum data on the photographing side and the illumination spectrum data on the reproduction side. Convert to spectral image.

  Next, the multi-dimensional spectrum image is converted into a three-dimensional vector image such as an XYZ value and transmitted to the reproduction side. Then, on the reproduction side, it is converted into a color signal corresponding to the spectral characteristic of the reproduction apparatus and output.

  The color-corrected image is corrected to a color that matches the output medium (monitor in this figure) and an output image is output. The output profile is created in the following procedure.

  The monitor 131 and the chromaticity meter 132 used for measurement are set in a place that is not affected by outside light such as a dark room. As shown in FIG. 35, the RGB signal generation unit 133 generates a predetermined RGB signal to control image display. It is displayed on the monitor 131 via the unit 134. The color displayed on the monitor 131 is measured by a chromaticity meter 132.

  A signal output from the chromaticity meter 132 is detected as a chromaticity value such as an XYZ value by the chromaticity detection unit 135 and sent to the output profile calculation unit 136.

  The output profile calculation unit 136 calculates an output profile from the relationship between the RGB values generated by the RGB signal generation unit 133 and the chromaticity values detected by the chromaticity detection unit 135. Next, the relationship between the RGB values output to the monitor 131 and the XYZ values output from the monitor 131 will be described. The monitor 131 has an RGB phosphor, and sends a signal to the RGB phosphor to display a color image. Signal values (RGB values) to be sent to the RGB phosphors are generated by the RGB signal generation unit 133 shown in FIG.

The RGB value is converted into a non-linear type by the γ characteristic of the monitor 131. The γ characteristics of RGB are γr [], γg [], and γb [], respectively. Further, since the sum of each of the RGB phosphors is perceived as a color, the sum of the signal values subjected to the γ characteristic is the chromaticity value (XYZ value) as shown by the following expression (11) output from the monitor. It becomes.

Here, Xrmax, Yrmax, Zrmax are XYZ values at the maximum luminance of the R phosphor, Xgmax, Ygmax, Zgmax are XYZ values at the maximum luminance of the G phosphor, and Xbmax, Ybmax, Zbmax are It is an XYZ value at the maximum luminance of the B phosphor.

The RGB value for obtaining a desired XYZ value can be calculated using the equation (11), and is expressed by the following equation (12).

  That is, it is constituted by matrix transformation and γ correction. FIG. 36 shows a summary of the series of processing.

In this configuration, the output profile calculation unit 136 calculates matrix coefficients for matrix conversion and γ correction values for γ correction from the RGB values and XYZ values, and stores them in the output profile storage unit 137. The device value conversion unit 138 performs matrix conversion and γ correction using the matrix coefficient and the γ correction value, and outputs RGB values to be displayed on the monitor of the image display control unit 134.
Japanese Patent Laid-Open No. 5-216452 JP-A-6-51732 etc. JP-A-9-172649

  In the conventional CMS (FIGS. 32 and 33) described above, the light source is designated as D50 on both the input side and the output side. For this reason, when an image is taken under illumination light that is not D50, or when an image output under illumination that is not D50 is observed, there is a problem that the colors do not match.

  In the conventional color image recording / reproducing system shown in FIG. 34, it is assumed that an image measured on the photographing side is converted into a chromaticity value such as an XYZ value according to the illumination light on the observation side and transmitted to the observation side. is doing.

  However, since the image once converted to the XYZ value does not already have spectral information, the observation side cannot freely convert illumination light data again. In addition, since only the spectral data of the illumination light at the time of photographing and the spectral data of the observation light at the time of observation are used for color matching in the spectrum, the input image itself must be somewhat accurate in order to improve color reproduction accuracy. Requires a lot of spectral information.

  Therefore, the image input device must be a multispectral camera that can capture a spectrum image in many bands, and it is difficult to capture in one shot. Also, the amount of image data becomes large.

  When the color-corrected image is displayed on the monitor, the monitor offset light and external light have an effect, and even if an output profile to the monitor is created by the conventional method, satisfactory color reproduction is not always obtained. .

  Normally, when the monitor is turned on, the monitor surface does not become black (X = Y = Z = 0) even if R = G = B = 0 is output to the monitor due to the offset light of the monitor. Also, illumination light (external light) at the place where the monitor is placed irradiates the monitor tube surface, and reflection from the monitor tube surface causes X = Y = Z = 0 even if the monitor is not turned on. Must not. That is, the offset light and external light of the monitor are added to the image signal originally displayed on the monitor. The sum of the offset light of the monitor and the external light is hereinafter referred to as a bias value.

  Considering the state in which the bias values are added, accurate color reproduction can be achieved by creating a profile. However, offset light and outside light vary greatly with time. For example, the offset light greatly changes from when the monitor is turned on until it becomes stable. In addition, the illumination light source used as external light changes greatly, changes with time, or changes in outdoor light outside the window. Regenerating the output profile every time the offset light or outside light fluctuates requires specialized knowledge and a great deal of time.

Accordingly, the present invention aims to provide a color reproduction device capable of easily color reproduction by the action of the output profile even when the external light offset light or shooting location is changed.

  To achieve the above object, the present invention provides a tone curve storage means for storing tone curves according to various conditions in a color reproduction device capable of accurate color reproduction in an image display device that displays an image by an input signal value. A color reproduction apparatus comprising: a condition detection unit that detects the various conditions; and a γ correction calculation unit that reads a tone curve from the tone curve storage unit and performs γ correction based on the condition detected by the condition detection unit I will provide a.

  Further, in a color reproduction device including a device value conversion unit that converts a device-independent color image into an output image, and an image display device that outputs the output image, the image display device is in accordance with various conditions. A tone curve storage means for storing the tone curve, wherein the device value conversion unit detects a condition from the tone curve storage means based on a condition detection means for detecting the various conditions and a condition detected by the condition detection means. An output profile creating unit that reads a tone curve and calculates a γ correction value; and a γ correction unit that γ corrects the device independent color image with reference to the γ correction value. And a color reproduction device including the output profile operation unit.

  According to the present invention, it is possible to provide a color reproduction device that can easily perform color reproduction using an output profile even when offset light or external light at a shooting location fluctuates.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A first embodiment of a color reproduction device according to the present invention will be described with reference to FIGS.

  First, as shown in FIG. 1, the image input device 1 that captures an image of an object, the color correction unit 3 that corrects the color of the image, and the image output device 2 that outputs (displays and prints) an output image are roughly classified. It consists of.

  This color correction unit 3 outputs a device-independent color conversion unit 4 that converts the color of the input image into a device-independent color with reference to the input profile 4a, and a converted device-independent color image. The device value conversion unit 5 converts the device value to the device value according to the characteristics of the image output apparatus 2 with reference to the profile 5a and outputs the image.

  As shown in FIG. 2, the device independent color conversion unit 4 includes an input profile creation unit 6 that calculates an input profile 4a in accordance with input image input device information and environmental information related to a color reproduction environment, and an input An input profile operation unit 7 that performs color conversion by applying an input profile to an image. As shown in FIG. 4, the input profile creation unit 6 can be configured as a matrix creation unit 9, and the input profile operation unit 7 can also be configured as a matrix calculation unit 8.

  As described above, since the input profile can be applied by matrix calculation, the input image can be converted to a device-independent color image at high speed.

  Further, as shown in FIG. 3, the color correction unit 3 includes an input profile 4a created by the input profile creation unit 6 and an output profile 5a created by the output profile creation unit 10 based on the image output device information. A configuration in which an input / output profile creation unit 11 and an input / output profile operation unit 13 for creating the output profile 12 are provided and the input profile and the output profile are connected to achieve high speed is also conceivable.

  Since the input profile creation unit 6 described above creates an input profile in consideration of various information for creating a color reproduction image, the input image can be accurately converted into a device-independent color image.

  The image input device information shown in FIG. 2 is the characteristics of the image input device used for shooting, the setting state thereof (hereinafter referred to as shooting characteristics), and the environment information is the image of the object. Spectral data of illumination light (hereinafter referred to as “photographing illumination light data”) when photographing with the input device, and spectral data of illumination light (hereinafter, referred to as observation illumination light data) at a place where an image of the photographed object is desired to be observed. And information such as the statistical properties of the spectrum of the photographed object (hereinafter referred to as subject characteristics).

  By using this photographing characteristic, a color reproduction image can be accurately estimated for each image input device. Color reproduction is possible even when the image input device is a multispectral camera that captures a plurality of spectral images or when it is captured by a digital camera.

  By using the photographic illumination light data, the influence of the illumination light at the time of photographing can be canceled. In other words, the accurate spectral reflectance of the object itself can be calculated regardless of the illumination light (for example, fluorescent lamp, incandescent lamp, sun, etc.). Further, by using the observation illumination light data, it is possible to calculate the color under illumination at the place where the image is actually observed. By using subject characteristics, a color reproduction image can be accurately estimated even if the input image has only a small amount of spectral information.

  Next, environment information input to the correction unit 3 will be described with reference to FIGS. 5 and 6.

  This environment information is supplied from any of the image input device 1, the dedicated input device 14, the network 15, or the storage medium 16.

  When environmental information is obtained from the image input device 1 or other input devices, environmental information at the time of image capture can be obtained in real time, and even when the environment changes from moment to moment, it is accurately converted into a device-independent color image. An input profile that can be created.

  Further, when the environment information is obtained from the network 15 or the storage medium 16, an input profile can be created in accordance with the remote environment or the past environment.

  The color correction unit 3 is mainly composed of a device independent color conversion unit 4 and a device value conversion unit 5 as shown in FIG. The input profile creation unit 6 of the device independent color conversion unit 4 includes an illumination light data selection unit 18 to which image input device information and environment information are input from the input device 14 and the like, a subject characteristic selection unit 19, and a photographing characteristic selection unit. 20 and an input profile calculation unit 21 that calculates the input profile 4a based on the respective outputs. In addition, the input profile operation unit 7 performs color conversion on the input image and performs color conversion on the selected image based on the input profile and processes the selected image into a device-independent color image. Part 23.

  The output profile application unit 24 of the device value conversion unit 5 selects a color conversion unit 25 that performs color conversion on a device-independent color image based on the output profile 5a and reproduces it, and selects an output destination of the reproduced image. The image output device 17, the storage medium 16, or the image output destination selection unit 26 that outputs to the network 15. The output profile creation unit 10 that creates the output profile 5a includes an output device characteristic selection unit 27 that selects necessary information from the image output apparatus information, and an output profile calculation unit that calculates the output profile 5a based on the selected output device characteristic. 28. Of course, each configuration of the present embodiment can be variously modified and changed.

  For example, the image input device 1 is a multispectral camera using a plurality of bandpass filters, a multispectral camera using a wavelength tunable filter using liquid crystal, a multispectral camera in which an optical path is divided by a prism, or a digital camera. May be. The image output device 17 may be a monitor, a projector, or a printer.

  The input device 14 can also use a spectroscope or a multispectral camera when obtaining spectral data. The same system as the present system may be installed in a remote place of the network 15 to transmit image and environmental information data to each other. A floppy (registered trademark) disk, MO, or the like is used as the storage medium.

  In such a configuration, as shown in FIG. 7, the color correction unit 3 is divided into a pre-process color correction unit 3a and a post-process color correction unit 3b, and the color conversion unit 23 converts the color correction unit 3 into a device-independent color image. After that, the output destination may be selected by the image output destination selection unit 31, stored in the storage medium 29, moved, or transmitted using the network 30.

  The device independent color image sent to the output profile operation unit 24 is selected by the device independent color image selection unit 32, and the selected image is reproduced by the color conversion unit 25 based on the output profile 5a. The

  In this embodiment, the device-independent color image has a smaller data size than an image in a format that can be converted to illumination, and may be effective when storing or transmitting image data.

  In this configuration, parts that are the same as the parts shown in FIG. 6 are given the same reference numerals, and descriptions thereof are omitted.

  Next, a configuration for creating and using the input / output profile 12 in which the input profile 4a and the output profile 5a are connected will be described with reference to FIG. 8 and FIG.

  The input / output profile operation unit 13 of the color correction unit 3 includes an input image selection unit 33 that selects an input image, and an input image conversion unit 34 that converts the selected image based on the generated input / output profile 12. The image converted here is output by selecting an output destination by the image output destination selection unit 35.

  With such a configuration, the input image needs to be converted only once, so that the processing speed is further increased compared to the configuration shown in FIG.

  FIG. 9 illustrates a specific configuration example when the color reproduction apparatus according to the first embodiment is actually constructed. The present embodiment is an example of a system that is constructed on computer software and creates a color reproduction image and displays it on a monitor.

  As shown in FIG. 9, a multispectral camera 41 that captures a multispectral image of an object 53, spectrometers 42 and 43 that measure illumination light data at the time of shooting and observation, and a color that measures the profile of the monitor 44. It is composed of a meter 45, a computer 46 and a monitor 44.

  In each component part constructed on software by the computer 46 and functioning as described above, parts that function in the same way as those described with reference to FIG. 6 are given the same reference numerals, and descriptions thereof are omitted.

  The computer 46 includes a multispectral image capturing unit 47 that captures a captured image from the multispectral camera 41 and an input profile 4a in addition to a part (software) for generating an input profile and an output profile. An illumination light data measurement unit 48 that controls the spectrometers 42 and 43 to obtain illumination light data, and a monitor measurement unit 49 that controls the chromaticity meter 45 to obtain data of the monitor 44 for creating the output profile 5a. And a color reproduction image display unit 50 for causing the monitor 44 to display an image in which the color is reproduced.

  In such a configuration, it is necessary to create an input profile and an output profile before color reproduction image creation processing.

  For creating the input profile, the spectral data of the illumination light at the time of photographing or observation is measured using the spectrometers 42 and 43. Since the reference plates 51 and 52 used for the measurement only need to be able to measure the spectral data of the illumination light, it is sufficient to use a plate having a known spectral reflectance. A standard white plate or the like having high reflectivity and little change with time is preferable. Although a light bulb type illumination is used for the photographing illumination light and a fluorescent lamp type illumination is used for the observation illumination light, the same illumination may be used. In addition, you may measure using natural sunlight instead of artificial illumination light.

  The imaging characteristics of the multispectral camera 41 calculated from the illumination light data measured by the illumination light data measurement unit 48 and the characteristics of the object are separately input, and the input profile creation unit 6 creates the input profile 4a. The created input profile 4a may be stored on a memory (not shown) or stored on a disk, and may be read again at the time of use.

  The output profile 5a can be created by displaying an appropriate color on the monitor 44 and using the measured value measured by the chromaticity meter 45. Specifically, the relationship between the chromaticity value of the light emitter of the monitor 44, the RGB digital value input to the monitor 44, and the actually emitted luminance (generally known as γ characteristics) may be calculated. .

  Based on the data measured by the monitor measurement unit 49, the output profile creation unit 10 creates an output profile 5a. The created output profile 5a may be saved on a memory or a disk and read again at the time of use, like the input profile 4a.

  In the present embodiment, a chromaticity meter is separately provided as monitor measurement, but a spectrometer used for illumination light data measurement can also be used.

  In order to create a color reproduction image of the measurement object, the measurement object 53 is measured by the multispectral camera 41, and the input profile 4a and the output profile 5a are applied in order to match the characteristics of the monitor 44 that outputs the image. To create an image. The multispectral camera 41 may be a multispectral camera having a rotary color filter composed of a plurality of bandpass filters or a multispectral camera using a transmission wavelength variable filter.

  If the input profile 4a is created for three-dimensional data, a normal RGB camera or digital camera can be used.

  In this embodiment, the color reproduction device is realized by a single personal computer, but a color reproduction device that accurately transmits colors between a plurality of personal computers connected to a network can also be realized.

An example of a software processing algorithm will be described below. First, when the output signal of the multispectral camera is gi, gi is

It can be expressed. Actually, the stimulus value XYZ when a human observes the object is

So,

What is necessary is just to calculate the matrix M. t represents a transposed matrix. The evaluation function is

Design M to minimize. E [] represents an operator for obtaining an expected value.

M obtained as is a least square filter,

Given in.

E [f (λ) · f (λ ′)] in Equation (6) represents the spectral correlation term of the measurement object. When the evaluation function is averagely reduced for all objects, it becomes a unit matrix. The filter M is as follows.

  If the object to be measured is limited to some extent and the spectral reflectance distribution can be expressed by a small number of bases, the color can be accurately estimated from a small number of spectral images. For example, in telemedicine, the skin color can be accurately reproduced from a small number of spectral images by measuring the spectral reflectance of the skin color and obtaining the correlation matrix in advance as a statistical property.

  That is, the input profile creation is to calculate Equation (6) when performing color reproduction processing using subject characteristics, and to calculate Equation (7) when subject properties are not used. The input profile operation unit is to apply the filter M to the signal obtained by the multispectral image capturing unit, that is, to calculate Equation (3).

  Next, a second embodiment of the color reproduction device according to the present invention will be described.

  As shown in FIG. 10, in the present embodiment, an image input apparatus 1 that captures an image of an object and a device independent that converts the color of the input image into a device independent color image with reference to the input profile 4a. A dent color conversion unit 4, a device value conversion unit 5 that converts the converted device independent color image into a device value that matches the characteristics of the image output device 2 while referring to the output profile 5 a, and outputs an output image; An image output device 2 that outputs (displays and prints) an image and an information database 54 that can freely refer to image input device information or environment information when creating an input profile.

  In this information database, the aforementioned image input device information and environment information are stored in a database and can be referred to when creating an input profile. By making it possible to refer to these pieces of information freely when creating an input profile, the input image can be converted into a device-independent color image in an arbitrary environment. Of course, the information database may be saved in a network destination or a storage medium such as a CD-ROM, and called and referred to when it is created. It is also possible to provide an information database (not shown) having information relating to the same image output apparatus and to refer to it when creating an output profile. Therefore, a device independent color image can be converted into an output image in an arbitrary environment.

  Next, a third embodiment of the color reproduction device according to the present invention will be described with reference to FIGS. In this embodiment, the input image itself has a part of image input device information or environment information necessary for creating an input profile, and performs color correction of image data having a data structure capable of illumination conversion. is there.

  In the present embodiment, as shown in FIG. 11, an image input apparatus 1 that captures an image of an object, a combination of captured image data and various types of information necessary for creating an input profile, is used to change the color due to the influence of illumination light. A color correction pre-processing unit 3c that converts an image format that can be color-converted with respect to a change (referred to as illumination variable image format), and an input profile and output for the illumination variable image data 55 that is output from the pre-processing unit 3c. The color correction unit 3d outputs image data that has been color-corrected by applying a profile, and the image output device 2 that outputs (displays and prints) the color-corrected image data.

  The color correction unit 3d includes an input data dividing unit 59 that again divides the input illumination variable image data 55 into image data and various types of information necessary for creating an input profile, and a device independence by applying the input profile to the image data. A device independent color conversion unit 4 that outputs a dent color image, and a device value conversion that converts the converted device independent color image into a device value that matches the characteristics of the output device while referring to the output profile, and outputs the image. Part 5.

  Here, the device independent color conversion unit 4 includes an input profile creation unit 6 that creates an input profile from input image input device information and environment information, and a device independent that causes the input profile to act on input image data. It comprises an input profile action unit 7 for converting to a dent color image.

  The illumination variable image data 55 includes, for example, a plurality of image data 55a identified by the number of bands as image data as in the format example shown in FIG. 12, photographing illumination light data 55b as environment information, and image input device information. As filter information 55c1 and shutter speed information 55c2 used in the image input apparatus, and various header information 55d.

  In this configuration, the image data itself input to the device independent color conversion unit 4 has part of the image input device information and environment information, and the image input device information is not included in the input image data. The environment information is input from the outside of the color correction unit as in the other embodiments.

  Therefore, by making part of the image data, the image input device information, and the environment information into one data structure in the color correction preprocessing unit 3c, it is possible to easily use data that can arbitrarily change the observation illumination light. Further, instead of the device independent color conversion unit 4 and the device value conversion unit 5, a configuration as shown in FIG. 8 may be used.

  Next, FIGS. 13 and 14 show and describe a modification of the above-described third embodiment.

  In this embodiment, the color correction unit as shown in FIG. 7 described above is divided into a pre-processing unit and a post-processing unit, and the image data format between them is approximated to the spectral reflectance data of the object (this) Is also a variable illumination image format) and is moved and transmitted.

  In this embodiment, the image input apparatus 1 that captures an image of an object and the color of the input image are converted into image data (illumination variable image) that approximates the spectral reflectance of the object with reference to the input profile A57. Then, the color correction preprocessing unit 3e having the image format conversion unit 56 to which header information is added, and the illumination variable image data 58 composed of the image data and the header information are taken in, and the device independence is referred to while referring to the input profile B4a. Independent color image conversion unit 4 for converting to a dent color image, and further, the converted device independent color image is converted into a device value that matches the characteristics of the image output device 2 with reference to the output profile 5a and output. Outputs (displays and prints) an output image and a color correction unit 3f including a device value conversion unit 5 as an image. And an image output device 3.

  This color reproduction device is characterized in that an input image is pre-format-converted with photographing characteristics and photographing illumination light data to form an illumination-convertible data structure that approximates the spectral reflectance of an object.

  As an example of the illumination variable image data 58 represented by the illumination variable image format, FIG. 14 shows a format example of subject image data representing the spectral reflectance of the object.

  In the present modification, the captured input image is converted by the color correction pre-processing unit 3e into image data (data approximating the spectral reflectance of the object) including shooting characteristics and shooting illumination light data. Compared to the image format of FIG. 11 shown in the third embodiment, the data volume can be reduced, and the processing speed can be increased.

  Next, a specific configuration example of the above-described third embodiment will be described.

  FIG. 15 and FIG. 16 show and explain a first specific configuration example of the third embodiment.

  This embodiment uses a recording medium that records product image data and a database of various illumination light data in a data format that can be converted to illumination in order to confirm the color sample of the product using a personal computer. is there.

  First, for example, the CD-ROM 60 of the storage medium is a product catalog viewer software, an illumination light database composed of illumination light information assumed to be provided at a place where the product is viewed, and product image data (illumination). Data that can be converted).

  As this configuration, the product catalog viewer software and the illumination light database, a CD-ROM 60 in which image data of products that can be converted to illumination are recorded, a personal computer 61 that operates the product catalog viewer software, and the installation location of the personal computer An illumination detection sensor 62 that detects illumination light and a monitor 63 that outputs an image from a personal computer.

  This personal computer 61 is necessary for color correction based on an output profile selection unit 64 that selectively outputs a suitable output profile from a plurality of preset output profiles, a read illumination light database, and a detection signal from the illumination detection sensor 62. An observation illumination selection unit 65 that selects and outputs data; a color correction unit 66 that performs color correction with reference to the input profile and the output profile from the illumination variable image data of the subject and outputs an image to the monitor 63; It consists of In addition, various kinds of hardware such as a hard disk, ROM, and RAM necessary for operating the viewer software are included.

  The input profile may be created by the color correction unit 66 using the illumination variable image data and the data from the illumination light database. Alternatively, the input profile may be created and saved in a storage medium such as a memory. Also good.

  According to this embodiment, the user inserts into the personal computer 61 that owns the CD-ROM 60, activates the product catalog viewer software, and displays the product catalog. At that time, the illumination light data is also called, and the change in color when the displayed product is under fluorescent light, incandescent light, or sunlight can be viewed as an image. It is also possible to connect an illumination light detection sensor to a personal computer and reproduce the color of the product at the installation location on the screen. Further, an object movie or the like that allows viewing of an image from various angles and illumination variable image data may be combined.

  In this embodiment, image data is supplied using a storage medium, but data may be provided via the Internet or the like. In addition, the product is not limited to clothing such as clothes, but is effective for color confirmation of cosmetics, furniture, electrical appliances, paintings, and the like.

  Next, a second specific configuration example of the third embodiment will be described with reference to FIGS. 17 to 19.

  In this embodiment, as shown in FIG. 17, in addition to the first specific configuration example described above, an image captured by a digital camera is inserted into image data of a product read from a CD-ROM, Can freely convert lighting.

  As shown in FIG. 18, the digital camera 67 includes a photographing lens 68, an image sensor 69 that converts an image photographed by photoelectric conversion into an electric signal, and a signal processing unit that processes image information including the electric signal. 70, a photographing characteristic storage unit 71 for storing photographing characteristics of the camera, an illumination detection sensor 72 for detecting illumination at the photographing location, and photographing illumination data detection for processing a sensor signal detected by the illumination detection sensor 72 And a memory card 74 that is detachable and stores subject image data, photographing characteristics, and photographing illumination data.

  Next, the color reproduction device includes a CD-ROM 60 in which the product catalog viewer software, the illumination light database, and the illumination variable image data are recorded, a personal computer 61 that operates the product catalog viewer software, and illumination of the installation location of the personal computer. An illumination detection sensor 62 for detecting light, a memory card 74 in which image data and the like are stored by a digital camera 67, a subject characteristic database 76 comprising characteristics of each subject stored on the hard disk, and a personal clothing database 77; Consists of.

  In addition to the configuration of the first specific example, the personal computer 61 includes a subject designation unit 78 for designating data corresponding to a subject from the subject characteristic database 76, and a subject image read from the memory card 74 with reference to the output profile. A color correction unit 79 that performs color correction based on data, shooting illumination data, and shooting characteristics, and an image combining unit 80 that combines the color-corrected images are provided.

  In the color reproduction device configured as described above, when the product catalog viewer software is activated and the product catalog is displayed, the user's own face photograph (67a) taken with the digital camera 67 and the product are combined (67b). ) Or with a software that can be coordinated while referring to the personal clothing database 77 that stores the clothes you have bought (already owned). Once the user has purchased the product, it can be easily simulated how it can be used and how it can be combined and dressed.

  In this embodiment, image data is supplied using a storage medium, but data may be provided via the Internet or the like. In addition, the product is not limited to clothing such as clothes, but is effective for color confirmation of cosmetics, furniture, electrical appliances, paintings, and the like.

  Next, a fourth embodiment of the color reproduction device according to the present invention will be described.

  The present embodiment includes an image input device 1 that can measure a part of environmental information at the same time as shooting an object, and the above-described device independent color conversion unit, device value conversion unit, and image output device. Is done.

  FIG. 20 shows a configuration of a multispectral camera that can simultaneously obtain a captured image of an object and a part of environment information that can be used in the present embodiment.

  In this configuration, the light beam collected by the photographing lens 81 is divided into optical paths by the half mirror 82 and the mirror 83, and is branched into an image sensor, for example, a CCD 84 and a spectroscope 85 to receive light.

  This frame-sequential multispectral camera captures a plurality of multispectral images while rotating a turret 86 composed of a plurality of bandpass filters by a motor 87 for capturing an image.

  In the meantime, the spectroscope 85 measures the spectral data of a certain spot a plurality of times, obtains the statistical property of the spectral data of the object, and sends it to the subject characteristic calculator 88a. That is, it is possible to simultaneously capture subject characteristics from image data and environmental information.

  The multispectral camera shown in FIG. 21 is an example in which the arrangement of spectrometers and the optical path in the camera shown in FIG. 20 are changed.

  This multispectral camera acquires spectral data of illumination light at the time of photographing directly from the outside by a spectroscope 89 disposed on the upper part of the camera, and based on this spectral data, photographing illumination light data is calculated by a photographing illumination light data calculation unit 88b. Is calculated. That is, it is possible to simultaneously capture image data and photographing illumination light data based on photographing spectrum data among environment information.

  Note that this embodiment can be applied to a multispectral camera using a plurality of bandpass filters, a multispectral camera using a wavelength tunable filter using liquid crystal, a multispectral camera in which an optical path is divided by a prism, or a digital camera. Of course it doesn't matter.

  Next, a fifth embodiment of the color reproduction device according to the present invention will be described.

  In this embodiment, an image input apparatus 1 that captures an image of an object similar to that described above, and a device independent that converts the color of the input image into a device independent color image with reference to the input profile 4a. A color conversion unit 4; a device value conversion unit 5 that converts the converted device-independent color image into a device value that matches the characteristics of the image output device with reference to the output profile 5a; The image output device 2 is configured to output (display and print). The image input device 1 is provided with a photographing characteristic storage unit that can store image input device information (all or part), and can be freely referred to when performing color correction.

  FIG. 22 shows a configuration of an example multispectral camera as the image input apparatus 1.

  This multispectral camera is interposed between the taking lens 81, a lens control unit 93 that drives and controls the taking lens, an image pickup device such as a CCD 84 that obtains a taken image as an electrical signal, and the taking lens 81 and the CCD 84. , A rotary filter turret 86 composed of a plurality of bandpass filters used for photographing an image, a motor 87 for rotating the filter turret 86, and a filter provided for each filter turret. A filter characteristic storage unit (photographing characteristic storage unit) 90 that stores data, a filter characteristic reading unit 91 that reads the filter characteristics, and a photographing characteristic conversion unit 92 that converts lens information, shutter speed control, and filter characteristics into photographing characteristics. Is done.

  This multispectral camera stores the filter characteristics of the filter attached to the filter turret 86, and when the filter turret 86 is replaced, the filter characteristics are read by the filter characteristic reading unit 91 each time.

  Further, information on the taking lens 81 can be read from the lens control device 93. The filter characteristic information and the lens information are converted into shooting characteristic data by the shooting characteristic conversion unit 92 and sent to the color reproduction apparatus side. The spectral sensitivity characteristics of the CCD 84 may be given as data stored in the camera.

  Note that the present embodiment is not limited to a multispectral camera using a plurality of bandpass filters, a multispectral camera using a tunable filter using liquid crystal, a multispectral camera in which an optical path is divided by a prism or the like, a digital camera But of course it does n’t matter.

  Next, a sixth embodiment of the color reproduction device according to the present invention will be described.

  In the present embodiment, only the device value conversion unit 5 is different from the configuration shown in FIG. 1, and the other configurations are the same.

  As shown in FIG. 23, the device value converter 5 subtracts the offset from the output profile generator 10 that generates the output profile 5a according to the input image output device information and the input device independent color image. An offset subtracting unit 94 that performs color conversion on the value obtained by subtracting the offset with reference to the output profile 5a.

Usually, offset light and external light are added to an image that is originally displayed.

As shown in this equation (8), the obtained XYZ value is obtained by adding the bias value (X0, Y0, Z0) to the RGB value to be output.

Therefore, only the bias values of offset light and external light are measured, and the bias values are subtracted from the XYZ values input to the profile. By this processing, the output profile obtained in the dark room or the like can be used as it is, so that much labor for profile creation is not required. In particular,

The bias value (X0, Y0, Z0) may be subtracted from the color desired to be displayed as shown in FIG.

  Next, a seventh embodiment of the color reproduction device according to the present invention will be described.

Usually, monitor offset light and external light are measured separately or simultaneously, and are subtracted from the XYZ values to be displayed. If the XYZ values due to the monitor offset light are Ox, Oy, Oz and the XYZ values due to the external light are Lx, Ly, Lz, the bias values X0, Y0, Z0 are

become. A conceptual diagram of the monitor tube surface is shown in FIG.

  FIG. 25 shows a configuration example in which a bias value is measured using a chromaticity meter.

  FIG. 25 (a) shows a case where XYZ values Ox, Oy, Oz are measured by monitor offset light. A monitor and a chromaticity meter are installed in a dark room, and the monitor is turned on and R = G = B =. 0 is output and the chromaticity value is detected. FIG. 25B shows a case where XYZ values Lx, Ly, Lz due to external light are measured, and FIG. 25C shows a case where bias values X0, Y0, Z0 are directly measured.

  FIG. 26 shows a configuration example of the device value conversion unit of FIG. 23 and its peripheral part.

This device value conversion unit 5 receives the bias values X0, Y0, Z0 obtained by adding the values from the Lx, Ly, Lz storage unit 95 and the Ox, Oy, Oz storage unit 96 based on the equation (10). Subtraction units 97a, 79b, 79c for subtracting from the XYZ values, and a matrix conversion unit 98 for matrix conversion of the subtracted XYZ values based on the above-described equation (9) in consideration of the coefficients read from the matrix coefficient storage unit. And γ correction units 99a, 99b, and 99c that respectively γ-correct the converted R′G′B ′. (See FIG. 36 for the output profile storage unit)
With this configuration, subtraction units 97a, 79b, and 79c are provided in front of the matrix conversion unit 98, and the bias values X0, Y0, and Z0 are subtracted from the input XYZ values.

  As shown in FIG. 25C, when the bias value is directly obtained, the bias memory 100 is provided, and the subtraction process is performed using the bias value stored in the bias memory 100.

  In this embodiment, since it is not necessary to change the output profile at all, the output profile can be operated very simply and at high speed.

  Next, an eighth embodiment of the color reproduction device according to the present invention will be described.

  In the present embodiment, a bias detection sensor is provided and used for detection of monitor offset light and external light.

  As shown in FIG. 27A, the chromaticity detection sensor 101 is brought into close contact with the monitor tube surface to detect offset light. As shown in FIG. 27B, when detecting external light, the external light detection adapter 102 is attached to the chromaticity detection sensor 101, for example, at the top of the monitor.

  In this case, since the chromaticity value obtained from the sensor is not a value from reflection on the monitor tube surface, it is converted into XYZ values Lx, Ly, and Lz of external light by the external light calculation unit.

  The offset light of the monitor stabilizes after a while after the monitor is turned on, but the change in outside light is very large, particularly when outdoor light is incident, and changes rapidly with time.

  According to this configuration, it is possible to instantly capture a change in external light that changes rapidly, and it is possible to always realize stable color reproduction.

  FIGS. 28A and 28B show a configuration example of a chromaticity detection sensor that can detect both offset light and external light. Windows 103a and 103b for capturing offset light and external light are provided at opposing positions, and an external light detection adapter 102 is attached to the external light window 103b. A rotatable mirror 104 is provided between these windows, and the captured light is bent by a chromaticity detection sensor 105 disposed below, and detection of offset light and detection of external light are switched by the rotating mirror 104.

  FIG. 28C shows a modification. In this configuration, the chromaticity detection sensor 105 and the spectrum detection sensor 106 are provided, and a mirror 107 is disposed above, and monitor offset light and external light detection are performed simultaneously. In particular, external light can be used as observation illumination light data as environment information necessary for creating the input profile as a configuration capable of detecting a spectrum.

  Next, a ninth embodiment of the color reproduction device according to the present invention will be described.

  In the present embodiment shown in FIG. 29, a chromaticity meter is provided in a hood that blocks external light from the monitor in the configuration shown in FIG.

  When the influence of outside light is very large, accurate color reproduction is impossible even if the above-described outside light or offset processing is performed. In places where accurate color reproduction is required, such as recognizing an affected area at a medical site, a hood 109 is inevitably attached to the monitor 108 to remove the influence of external light as in this configuration.

  Therefore, the chromaticity meter 101 is attached to the hood 109 for preventing external light, and the bias value is detected.

  In this embodiment, when the reset button 110 is pressed, an image of R = G = B = 0 is displayed on the monitor 108, and the chromaticity meter 101 measures the bias values X0, Y0, Z0. Using the hood 109, the influence of external light is reduced and the influence of external light due to processing is further removed, so that accurate color reproduction is possible.

  In this embodiment, the bias value is detected when the reset button 110 is pressed. However, an image of R = G = B = 0 is always displayed on a part of the image, for example, the lower right part on the monitor 108. Thus, the bias value due to the influence of external light may be constantly updated.

  Also, the bias value may be different depending on the area of the monitor screen.

In such a case, a camera capable of measuring XYZ values is attached instead of the chromaticity meter, and the bias value is obtained for each pixel or each block of the image displayed on the monitor 108, for example. A different bias value may be subtracted for each pixel. When the hood 109 is used, outside light is reduced in the upper part of the monitor 108, but the influence of outside light still remains in the lower part of the monitor 108. Therefore, if a bias value corresponding to the position of the monitor 108 is used, Accurate color reproduction is possible on the entire monitor.

  Next, a description will be given of a tenth embodiment of the color reproduction device according to the present invention.

  In this embodiment, information necessary for profile creation is prepared in advance in the monitor, and a chromaticity meter is not required when creating a profile.

  As shown in FIG. 30, the monitor 110 has a time measuring unit 111 that measures the operating time of the monitor, a thermometer 112 that measures the temperature of the monitor 110, and an RGB that stores the XYZ chromaticity values of the RGB phosphors. A phosphor XYZ value storage unit 113 and a tone curve data storage unit 114 for storing tone curve data are provided, and a contrast adjustment unit 115 and a brightness adjustment unit 116 are further provided.

  The output profile calculation unit 117 is provided with a matrix coefficient calculation unit 118 and a γ correction calculation unit 119, and the output profile storage unit 120 further includes a matrix coefficient storage unit 121 for storing these calculation results, and an R , G and B gamma correction tables 122a, 122b and 122c.

  In such an embodiment, the XYZ chromaticity values and tone curve data of the RGB phosphors according to various conditions are stored in each storage unit provided in the monitor 110, and the selected XYZ chromaticity values and tones are selected. With reference to the curve data, each of the matrix coefficient and the γ correction value is calculated in the output profile calculation unit. The various conditions include the use time after the monitor is manufactured (total time during which the power is turned on), temperature, contrast, brightness adjustment values, and the like.

  In the present embodiment, since the output profile is generated without using a chromaticity meter, the output profile can be operated very easily.

  In this embodiment, the XYZ chromaticity values and tone curve data of the RGB phosphors according to various conditions are stored inside the monitor. However, they are stored as file data in a personal computer or the like and read out as necessary. It may be used.

  Next, an eleventh embodiment of the color reproduction device according to the present invention will be described.

In the present embodiment, a device value conversion unit that performs bias value correction using a table when referring to an output profile will be described.

  As shown in FIG. 31, the device value conversion unit subtracts the bias values X0, Y0, and Z0 from the input XYZ values and the R table 123, G table 124, and B table 125, which are output profiles. Part 126 is provided.

  Therefore, RGB values corresponding to the input XYZ values can be output according to the output profile of each table.

  In the present embodiment, the method described in the seventh embodiment is effective for a monitor that satisfies the expression (11), but there is a monitor that does not satisfy the expression (11) in other monitors.

  In that case, a method is known in which RGB values corresponding to XYZ values are tabulated. In this case, the bias value is corrected by subtracting the bias values X0, Y0, Z0 from the XYZ values to be output, as in the seventh embodiment, and referring to the table.

  In this embodiment, even when a table is used to refer to the output profile, the bias value of offset light or external light can be corrected well.

As mentioned above, although demonstrated based on embodiment, this invention includes the following inventions.

(1). In a color reproduction device that performs color conversion on an image photographed by an image input device, color conversion by color correction means, and display or print output on the image output device,
The color correction means is
A color reproduction device that performs color conversion from an input image to an output image using information relating to a color reproduction environment comprising information at the time of photographing and observation, information relating to the image input device, and information relating to the image output device .

(Corresponding Embodiment) The first embodiment corresponds.

(Effect) When performing color reproduction, color correction is performed based on information on a color reproduction environment including information at the time of photographing and observation, information on an image input device, and information on an image output device. As described above, it is possible to convert an input image into an output image with high accuracy by considering various information.

(2). The color reproduction device according to item (1), wherein information on an object to be photographed is further used as information on the color reproduction environment.

(Corresponding Embodiment) All the embodiments correspond. See especially the first embodiment.

(Function and effect) By using the information of the object to be photographed as the color reproduction environment information, the input image can be accurately converted into an output image even if the input image has only a small amount of spectral information.

(3). In a color reproduction device that performs color conversion on an image photographed by an image input device, color conversion by color correction means, and display or print output on the image output device,
The color correction means is
An input profile creation unit that creates an input profile according to information about the image input device and information about the color reproduction environment;
A device-independent color image conversion means having an input profile operation unit that converts an input image into a device-independent color image with reference to the input profile;
An output profile creation unit that creates an output profile according to information on the image output device;
Device value conversion means having an output profile operation unit that converts a device-independent color image into an output image with reference to the output profile;
The color reproduction device according to the above items (1) and (2), characterized by comprising:

(Corresponding Embodiment) The first embodiment corresponds.

(Effect) When performing color reproduction, color correction is performed based on an input profile based on information on the color reproduction environment and information on the image input device and an output profile based on information on the image output device, As described above, an input image can be converted into an output image with high accuracy by using an input profile and an output profile in consideration of various information.

(4). In a color reproduction device that performs color conversion on an image photographed by an image input device, color conversion by color correction means, and display or print output on the image output device,
The color correction means is
An input / output profile creation unit that creates an input / output profile based on information on the image input device, information on the color reproduction environment, and information on the image output device;
With reference to the input / output profile, an input / output profile operation unit that converts a captured image into an output image;
The color reproduction device according to the above items (1) and (2), characterized by comprising:

(Corresponding Embodiment) The first embodiment corresponds.

(Operational effect) Since the image captured by the input / output profile operation unit is converted into an output image, the image conversion is performed only once, so that the color correction process is further accelerated.

(5). The information about the image input device is information obtained from the characteristics of the image input device used for shooting and the setting state thereof, and the information about the color reproduction environment is an image input of an object to be a subject. The color reproduction device according to (1) above, which is spectral data of illumination light at the time of photographing with the device and spectral data of illumination light at a place where the photographed object image is desired to be observed.

(Corresponding Embodiment) All the embodiments correspond.

(Function / Effect) When performing color reproduction, information on the color reproduction environment consisting of information at the time of photographing and observation, that is, spectral data of illumination light when photographing an image of an object to be a subject with an image input device and photographing Color correction is performed based on an input profile based on spectral data of illumination light at a location where an image of an object is desired to be observed and information on the image input device, and an output profile based on information on the image output device. As described above, by using an input profile and an output profile in consideration of various information, an input image can be converted into an output image with high accuracy.

(6). The information on the object to be photographed added to the color reproduction environment is spectrum statistical data of the object to be photographed.

(Corresponding Embodiment) All the embodiments correspond.

(Effect) By using the information of the object to be photographed as the information of the color reproduction environment regarding the input profile, that is, the spectrum statistics data of the object, the input image can be accurately converted into the output image even if the input image has little spectrum information. Can be converted.

(7). The device independent color image converting means is
A selection unit that selects appropriate information for the information about the image input device and the information about the color reproduction environment, an input profile creation unit that creates an input profile in a matrix format based on the selected information,
The color reproduction apparatus according to (3), further comprising: an input profile operation unit that converts an input image into a device-independent color image by matrix calculation using the matrix-type input profile.

(Corresponding Embodiment) The first embodiment corresponds.

(Operational Effect) Since the input profile can be operated by matrix calculation, the input image can be converted into a device-independent color image at high speed.

(8). The input profile creation unit, the input profile action unit, the output profile creation unit, and the output profile action unit each have a selection unit for various information to be input,
The input image, the information about the image input device, the information about the color reproduction environment, and the information about the image output device can be obtained from any of the image input device, a dedicated input device, a network connected to an external device, and a storage medium. The color reproduction device according to item (3), wherein the color reproduction device is supplied.

(Corresponding Embodiment) The first embodiment corresponds.

(Operation and effect) Various information can be selectively obtained from an image input device, a dedicated input device, a network connected to an external device, or a storage medium by a selection unit of various information. Therefore, color correction can be performed using arbitrary information (real-time information, past information, etc.) when creating an input or output profile or when a profile is applied.

(9). The input profile creation unit, the output profile operation unit, and the input / output profile operation unit each have a selection unit for various information to be input to each,
The input image, the information about the image input device, the information about the color reproduction environment, and the information about the image output device can be obtained from any of the image input device, a dedicated input device, a network connected to an external device, and a storage medium. The color reproduction device according to item (4), wherein the color reproduction device is supplied.

(Corresponding Embodiment) The first embodiment corresponds.

(Operation and effect) Various information can be selectively obtained from an image input device, a dedicated input device, a network connected to an external device, or a storage medium by a selection unit of various information. Therefore, it is possible to perform color correction using arbitrary information (real-time information, past information, etc.) when creating an input / output profile or when an input / output profile is applied.

(10). The color correction means is
An information database in which at least one of the information on the image input device, the information on the color reproduction environment, and the information on the image output device is databased,
The color reproduction device according to (3) and (4) above, wherein desired data is selectively obtained when an input profile is created or when an output profile is created.

(Corresponding Embodiment) The second embodiment corresponds.

(Operation and Effect) When an input profile is created or an output profile is created, desired data can be selectively obtained by this information database, so that an input image can be converted into an output image in an arbitrary environment.

(11). The color reproduction device further includes a color correction preprocessing unit,
The color correction pre-processing unit includes image data captured by the image input device, information on the image input device, spectral data of illumination light when an image of an object to be a subject is captured by the image input device, Using at least one of the spectrum statistics data of the object to be photographed, the format is converted into a data structure that can be converted to illumination, and the color correction means processes the image data that can be converted to illumination, under a desired observation illumination light. The color reproduction apparatus according to the above items (3) and (4), wherein the color reproduction device outputs the corrected color.

(Corresponding Embodiment) The third embodiment and its modification correspond.

(Effect) The color correction pre-processing unit uses the image data of the input image as at least one of the information related to the image input device, the spectrum data of the illumination light when photographing the subject, and the spectrum statistical data of the photographing object. Since the format is converted to a data structure that can be converted to illumination, it is possible to obtain easy-to-use data for data processing in the color correction means.

(12). The image input device includes image data detection means for detecting image data from a light image by photoelectric conversion, and a spectroscope for detecting spectrum data.
The above image data;
Among the information on the color reproduction environment, it is possible to simultaneously measure spectral data of illumination light when photographing an image of an object to be a subject with the image input device or spectrum statistical data of the object to be photographed. The color reproduction device according to item (3) or item (4), characterized in that

(Corresponding Embodiment) The fourth embodiment corresponds.

(Function and effect) Since the image input device includes the image data detecting means and the spectroscope, the spectrum data of the subject illumination light at the time of shooting (image input) or the shooting of the image data and information on the color reproduction environment The spectrum statistical data of the object can be acquired simultaneously.

(13). The image input device includes a storage unit that stores information related to the image input device,
The color reproduction apparatus according to (3) and (4) above, wherein desired information relating to the image input apparatus can be freely read out by the color correction means.

(Corresponding Embodiment) The fifth embodiment corresponds.

(Effect) Since the image input apparatus itself includes a storage unit for storing information related to the image input apparatus, desired information related to the image input apparatus can be freely read out to the color correction means during color correction.

(14). A bias in which the device value converting means subtracts a bias value of a color signal due to ambient external light irradiated on an output surface of the image output device and an offset of the image output device from the device independent color image; Has a subtraction part,
The color reproduction device according to (3) above, wherein after the bias value is subtracted, the output profile operation unit converts the output value into an output image while referring to the output profile.

(Corresponding Embodiment) The sixth to ninth embodiments correspond.

(Function and effect) The bias value of the color signal due to the ambient light irradiated on the output surface of the image output device by the bias subtracting unit and the offset of the image output device is subtracted from the device independent color image, and then In addition, since the output profile is converted into the output image while referring to the output profile, the output profile obtained in advance in the dark room can be used as it is, and the output profile creation does not require much effort. .

  As described above in detail, according to the present invention, color reproduction comprising information on an image input device, information on spectral data of illumination light at the time of photographing and observation, and information on statistical properties of the spectrum of the photographed object, etc. Image conversion is performed with reference to environmental information, and the shooting location and reproduction location of the image can be remoted, and accurate color reproduction with an easy and high-speed output profile is possible even when offset light or outside light fluctuates. Therefore, it is possible to provide a color reproduction device capable of achieving the above.

1 is a diagram showing a schematic configuration of a first embodiment as a color reproduction device according to the present invention. FIG. It is a figure which shows the structural example of the device independent color conversion part shown in FIG. 1, and a device value conversion part. It is a figure which shows the other structural example of the color correction part shown in FIG. It is a figure for demonstrating the structural example of a device independent color conversion part. It is a figure for demonstrating an example of the input method of the environmental information input into a correction | amendment part. It is a figure for demonstrating an example of the input method of the environmental information input into a correction | amendment part. It is a figure which shows the structural example of the color correction part divided into the color correction part of a pre-process, and the color correction part of a post-process. It is a figure which shows the structural example which produces and uses the input-output profile which connected the input profile and the output profile. It is a figure which shows the specific structural example of the color reproduction apparatus in 1st Embodiment. It is a figure which shows the schematic structural example of 2nd Embodiment of the color reproduction apparatus by this invention. It is a figure for demonstrating the illumination variable image data input into the color correction part of 3rd Embodiment. It is a figure which shows the example of a format of illumination variable image data used for 3rd Embodiment. It is a figure which shows the modification of 3rd Embodiment. It is a figure which shows the example of a format of illumination variable image data in the modification of 3rd Embodiment. It is a figure which shows the external appearance of the 1st specific structural example of 3rd Embodiment. It is a figure which shows the 1st specific structural example of 3rd Embodiment. It is a figure which shows the external appearance of the 2nd specific structural example of 3rd Embodiment. It is a figure which shows the structural example of the digital camera used for the 2nd specific structural example of 3rd Embodiment. It is a figure which shows the 2nd specific structural example of 3rd Embodiment. It is a figure which shows the structural example of the multispectral camera used for 4th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the 2nd structural example of the multispectral camera used for 4th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the structural example of the multispectral camera used for 5th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the structural example of the device value conversion part in 6th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the conceptual diagram of the monitor pipe surface in 7th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the structural example which measures a bias value using the chromaticity meter in 7th Embodiment. It is a figure which shows the structural example of the device value conversion part in 7th Embodiment. It is a figure for demonstrating the chromaticity detection sensor in 8th Embodiment of the color reproduction apparatus by this invention. It is a figure for demonstrating the modification of the chromaticity detection sensor in 8th Embodiment. It is a figure which shows the structure of 9th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the structure of 10th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the structure of the device value conversion part in 11th Embodiment of the color reproduction apparatus by this invention. It is a figure which shows the schematic structural example of the conventional color reproduction apparatus. It is a figure which shows the schematic structural example of the color correction part of the conventional color reproduction apparatus. It is a figure which shows the structural example in which image reproduction is possible in the place away from the imaging | photography place with the conventional color reproduction apparatus. It is a figure which shows the structural example of the output profile preparation part in the color correction part of the conventional color reproduction apparatus. It is a figure which shows the structural example which performs a series of processes which perform matrix conversion and (gamma) correction in the color correction part of the conventional color reproduction apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image input device, 2 ... Image output device, 3 ... Color correction part, 4 ... Device independent color conversion part, 4a ... Input profile, 5 ... Device value conversion part, 5a ... Output profile, 6 ... Input profile creation Part, 7 ... input profile action part.

Claims (5)

In a color reproduction device capable of accurate color reproduction in an image display device that displays an image according to an input signal value,
A tone curve storage means for storing a tone curve according to various conditions;
Condition detecting means for detecting the various conditions;
Based on the condition detected by the condition detection means, a tone curve is read from the tone curve storage means, and γ correction calculation means for performing γ correction;
A color reproduction device comprising:   2. The color according to claim 1, wherein the various conditions are any one of a use time of the image display device, a temperature of the image display device, a contrast value of the image display device, or an adjustment value of brightness. Reproduction device. In a color reproduction device comprising: a device value conversion unit that converts a device-independent color image into an output image; and an image display device that outputs the output image.
The image display device includes tone curve storage means for storing tone curves according to various conditions,
The device value converter is
An output having condition detection means for detecting the various conditions, and γ correction calculation means for reading a tone curve from the tone curve storage means and calculating a γ correction value based on the conditions detected by the condition detection means A profile creation unit;
With reference to the γ correction value, an output profile operation unit having γ correction means for γ correcting the device independent color image;
A color reproduction device comprising:   The color according to claim 3, wherein the various conditions are any one of a use time of the image display device, a temperature of the image display device, a contrast value of the image display device, or an adjustment value of brightness. Reproduction device. The image display device includes RGB phosphor XYZ value storage means for storing XYZ chromaticity values of RGB phosphors,
The output profile creation unit further includes matrix coefficient calculation means for calculating matrix coefficients with reference to XYZ chromaticity values selected from the RGB phosphor XYZ value storage means,
The output profile operation unit further includes matrix conversion means for performing matrix conversion on the device independent color image based on the matrix coefficient,
5. The color reproduction apparatus according to claim 3, wherein the γ correction means performs γ correction on the image data of the RGB values subjected to matrix conversion.

Images