JP2018032923A - Projector device and method for controlling projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device for quickly adjusting before projecting an image. A projector device includes a display unit that projects an image with a light beam emitted from a light source unit, a photographing unit that captures an image projected by the display unit, and an image quality of an image projected by the display unit. The correction control unit 163 for correcting the image and the elapsed time that has elapsed since the output of the light source unit 111 is changed, and the photographing unit 140 is used for adjustment based on the variation information indicating the variation in the characteristic value of the image during the elapsed time. A control unit 160 that corrects the characteristic value of the adjustment pattern from the elapsed time when the pattern is captured, and causes the correction control unit 163 to correct the image quality based on the corrected characteristic value. [Selection] Figure 1

Description

  The present invention relates to a projector device and a method for controlling the projector device.

Conventionally, a light source unit, a light modulation device that modulates a light beam emitted from the light source unit with a modulation unit to form an image according to image information, a projection optical device that enlarges and projects the formed image on a screen, and the like, There is known a projector apparatus provided with
For example, in a projector apparatus as shown in Patent Document 1 below, before starting and projecting content, as an adjustment process, the output of the light source unit is changed to roughly adjust the brightness of the test image projected on the screen, The brightness and color characteristics are finely adjusted by changing the setting of the modulation means of the light modulation device after a certain time has elapsed.

JP 2002-72359 A

However, the time required for the output to stabilize after adjusting the output of the light source unit varies depending on the output adjustment amount, the elapsed time since the projector device was started, etc. It was necessary to set a long time, and the adjustment process could not be performed in a short time.
The present invention has been made in view of the above-described problems, and an object thereof is to quickly make adjustments when using a projector device.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
The projector apparatus according to this application example corrects the image quality of the image projected by the projection unit that projects an image by the light beam emitted from the light source, the imaging unit that captures the image projected by the projection unit, and the image projected by the projection unit. A correction unit that measures the elapsed time that has elapsed since the output of the light source is changed, and the imaging unit captures an adjustment image based on variation information that indicates a variation in the characteristic value of the image during the elapsed time. And a control unit that corrects the characteristic value of the adjustment image based on the elapsed time and causes the correction unit to correct the image quality based on the corrected characteristic value.

  According to such a configuration, the elapsed time that has elapsed since the output of the light source is changed is measured, and the imaging unit captures the adjustment image based on the variation information indicating the variation in the characteristic value of the image during the elapsed time. Since the characteristic value of the adjustment image is corrected based on the elapsed time and the image quality is corrected based on the corrected characteristic value, it is necessary to wait until a certain time elapses to correct the image quality after changing the light source output Therefore, the projector device can be adjusted in a short time.

[Application Example 2]
In the projector device according to the application example, the control unit sequentially projects a plurality of adjustment images having different color characteristics on the projection unit, and the characteristic values in the plurality of adjustment images captured by the imaging unit. Calculating the fluctuation in the elapsed time when the adjustment image was taken based on the fluctuation information, correcting the characteristic value for each color characteristic based on the obtained fluctuation, It is preferable to calculate an adjustment value for correcting the image quality based on the characteristic value.

  According to such a configuration, the characteristic values of a plurality of adjustment images having different color characteristics are calculated, and fluctuations in the elapsed time when the adjustment images were taken are acquired based on the fluctuation information. Since the characteristic value is corrected for each color characteristic and the adjustment value for correcting the image quality is calculated based on the corrected characteristic value, the adjustment value for correcting the image quality from a plurality of adjustment images having different color characteristics can be quickly obtained. Can be calculated.

[Application Example 3]
In the projector device according to the application example described above, it is preferable that the correction unit corrects at least one of luminance, chromaticity, and gradation of the image projected by the projection unit based on the calculated adjustment value. .

  According to such a configuration, it is possible to project an image with excellent color reproducibility and visibility by correcting at least one of the luminance, chromaticity, and gradation of the image projected by the projection unit.

[Application Example 4]
In the projector device according to the application example described above, it is preferable that the change information is at least one of a mathematical expression and a numerical value table that indicate a relationship between the elapsed time and the change in the characteristic value.

  According to such a configuration, the variation information is at least one of a mathematical expression and a numerical value table indicating the relationship between the elapsed time and the variation of the characteristic value, and can be easily referred to.

[Application Example 5]
In the projector device according to the application example, it is preferable that the mathematical expression is a quadratic approximate expression.

  According to such a configuration, the relationship between the elapsed time and the fluctuation of the characteristic value can be approximated in detail by the quadratic approximation formula.

[Application Example 6]
The projector apparatus according to this application example corrects the image quality of the image projected by the projection unit that projects an image by the light beam emitted from the light source, the imaging unit that captures the image projected by the projection unit, and the image projected by the projection unit. And a correction unit that measures the elapsed time that has elapsed since the output of the light source is changed, and projects a reference image on the projection unit at a first elapsed time and a second elapsed time to cause the photographing unit to take an image. The adjustment image is projected onto the projection unit at the third elapsed time from the first elapsed time until reaching the second elapsed time, and the imaging unit captures the first elapsed time. The third characteristic value of the adjustment image at the third elapsed time is corrected based on variation information indicating variation in the characteristic value of the reference image from time to the second elapsed time, and the corrected Based on the third characteristic value A control unit for correcting the image quality Tadashibu, characterized in that it comprises a.

  According to such a configuration, a change in the first characteristic value of the reference image taken at the first elapsed time and the second characteristic value of the reference image taken at the second elapsed time is shown. In order to correct the third characteristic value of the adjustment image at the third elapsed time based on the variation information, and to correct the image quality based on the corrected third characteristic value, the image quality is changed after changing the output of the light source. Since it is not necessary to wait until a certain period of time elapses to correct the projector, the projector device can be adjusted in a short time.

[Application Example 7]
In the projector device according to the application example, the variation information includes a first characteristic value of the reference image captured at the first elapsed time and a first characteristic value of the reference image captured at the second elapsed time. 2 is a first-order approximation formula that approximates the amount of change between the characteristic value and the control value, and the control unit corrects the third characteristic value by interpolating the variation information according to the third elapsed time. It is preferable.

  According to such a configuration, the amount of change between the first characteristic value of the reference image captured at the first elapsed time and the second characteristic value of the reference image captured at the second elapsed time is calculated. Since the third characteristic value is corrected by approximating and interpolating according to the third elapsed time, it can be corrected with high accuracy.

[Application Example 8]
The projector device according to the application example includes a communication unit that communicates with another projector device, and the control unit displays information on whether or not the image quality is corrected by the correction unit based on the corrected characteristic value. It is preferable to communicate with the other projector device.

  According to such a configuration, in the plurality of projector apparatuses, the correction information of the image quality in the correction unit can be shared, and one image can be divided and projected in cooperation with the plurality of projector apparatuses.

[Application Example 9]
The control method of the projector device according to this application example measures the elapsed time that has elapsed since the output of the light source for projecting the image is changed, and uses the variation information indicating the variation of the characteristic value of the image during the elapsed time. On the basis of this, the characteristic value of the adjustment image is corrected based on the elapsed time at which the adjustment image was captured, and the image quality of the image is corrected based on the corrected characteristic value.

  According to such a method, the elapsed time after the output of the light source is changed is measured, and based on the fluctuation information indicating the fluctuation of the characteristic value of the image in the elapsed time, from the elapsed time when the adjustment image is captured. Since the characteristic value of the adjustment image is corrected and the image quality is corrected based on the corrected characteristic value, there is no need to wait until a certain time elapses after the light source output is changed to correct the image quality. The projector device can be adjusted in a short time.

[Application Example 10]
The control method of the projector apparatus according to this application example measures the elapsed time since the output of the light source for projecting the image is changed, and projects the reference image at the first elapsed time and the second elapsed time. The image for adjustment is projected and photographed at a third elapsed time from the first elapsed time to the second elapsed time, and from the first elapsed time to the first elapsed time. The third characteristic value corrected by correcting the third characteristic value of the adjustment image at the third elapsed time on the basis of the fluctuation information indicating the fluctuation of the characteristic value of the reference image reaching the elapsed time of 2, and the corrected third characteristic The image quality of the image is corrected based on the value.

  According to such a configuration, a change in the first characteristic value of the reference image taken at the first elapsed time and the second characteristic value of the reference image taken at the second elapsed time is shown. In order to correct the third characteristic value of the adjustment image at the third elapsed time based on the variation information, and to correct the image quality based on the corrected third characteristic value, the image quality is changed after changing the output of the light source. Since it is not necessary to wait until a certain period of time elapses to correct the projector, the projector device can be adjusted in a short time.

1 is a configuration diagram illustrating a configuration of a projector device according to a first embodiment. 5 is a flowchart showing a flow of adjustment processing executed when the projector apparatus according to the first embodiment projects an image. 5 is a flowchart for explaining details of processing for correcting panel characteristics according to the first embodiment. FIG. 3 is a diagram for explaining correction of a photographing value photographed by a photographing unit in the first embodiment. 9 is a flowchart for explaining details of processing for correcting panel characteristics according to the second embodiment. FIG. 6 is a view for explaining correction of a photographing value photographed by a photographing unit in the second embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram illustrating a configuration of the projector device 100.
An image supply device 200 is connected to the projector device 100. The image supply device 200 is a device that supplies an image signal to the projector device 100. The projector device 100 projects an image based on an image signal of content supplied from the image supply device 200 or image data stored in advance in the storage unit 170 described later on the screen SC. For example, a video playback device, a DVD (Digital Versatile Disk) playback device, a TV tuner device, a CATV (Cable television) set-top box, a video output device such as a video game device, a personal computer, or the like is used as the image supply device 200. It is done.

The projector device 100 includes an image input unit 151. The image input unit 151 includes a connector for connecting a cable and an interface circuit (both not shown), and inputs an image signal supplied from the image supply device 200 connected via the cable. The image input unit 151 converts the input image signal into image data and outputs the image data to the image processing unit 152.
The interface provided in the image input unit 151 may be, for example, an interface for data communication such as Ethernet (registered trademark), IEEE 1394, or USB. The interface of the image input unit 151 may be an interface for image data such as MHL (registered trademark), HDMI (registered trademark), DisplayPort, or the like.

Further, the image input unit 151 may have a configuration including a VGA terminal to which an analog video signal is input and a DVI (Digital Visual Interface) terminal to which digital video data is input as a connector. Further, the image input unit 151 includes an A / D conversion circuit, and when an analog video signal is input via the VGA terminal, the analog video signal is converted into image data by the A / D conversion circuit, and the image processing unit 152 Output to.
The projector apparatus 100 includes a display unit (projection unit) 110 that forms an optical image and projects (displays) the image on the screen SC. The display unit 110 includes a light source unit 111 as a light source, a light modulation device 112, and a projection optical system 113.

  The light source unit 111 includes a light source such as a xenon lamp, an ultra high pressure mercury lamp, an LED (Light Emitting Diode), or a laser light source. The light source unit 111 may include a reflector and an auxiliary reflector that guide the light beam emitted from the light source to the light modulation device 112. Furthermore, the light source unit 111 includes a lens group for increasing the optical characteristics of the projection light, a polarizing plate, a light control element that reduces the amount of light emitted by the light source on the path to the light modulation device 112, and the like (both shown) Abbreviation) may be provided.

  The light source unit 111 is driven by the light source driving unit 121. The light source driving unit 121 is connected to the internal bus 180. The light source driving unit 121 turns on and off the light source of the light source unit 111 under the control of the control unit 160.

  The light modulation device 112 includes, for example, three liquid crystal panels corresponding to the three primary colors of RGB as modulation means. The light emitted from the light source unit 111 is separated into three color lights of RGB and is incident on the corresponding liquid crystal panel. The three liquid crystal panels are transmissive liquid crystal panels, and modulate the transmitted light to generate image light. The image light modulated by passing through each liquid crystal panel is combined by a combining optical system such as a cross dichroic prism and emitted to the projection optical system 113.

The light modulation device 112 is connected to the light modulation device 112 for driving the liquid crystal panel of the light modulation device 112. The light modulator driving unit 122 is connected to the internal bus 180.
The light modulation device driving unit 122 generates R, G, and B image signals based on the display image data input from the image processing unit 152, respectively. The light modulator driving unit 122 drives the corresponding liquid crystal panel of the light modulator 112 based on the generated R, G, B image signals, and draws an image on each liquid crystal panel.

  The projection optical system 113 includes a lens group that projects the image light modulated by the light modulation device 112 toward the screen SC and forms an image on the screen SC. Further, the projection optical system 113 may include a zoom mechanism for enlarging / reducing the projected image of the screen SC and adjusting the focus, and a focus adjusting mechanism for adjusting the focus.

The projector device 100 includes an operation panel 131 and a processing unit 133. The processing unit 133 is connected to the internal bus 180.
The operation panel 131 functioning as a user interface displays various operation keys and a display screen composed of a liquid crystal panel. When the operation key displayed on the operation panel 131 is operated, the processing unit 133 outputs data corresponding to the operated key to the control unit 160. Further, the processing unit 133 displays various screens on the operation panel 131 under the control of the control unit 160.
In addition, the operation panel 131 is integrally formed with a touch sensor that detects contact with the operation panel 131. The processing unit 133 detects the position of the operation panel 131 touched by the user's finger or the like as an input position, and outputs data corresponding to the detected input position to the control unit 160.

In addition, the projector device 100 includes a remote control light receiving unit 132 that receives an infrared signal transmitted from the remote control 5 used by the user. The remote control light receiving unit 132 is connected to the processing unit 133.
The remote control light receiving unit 132 receives an infrared signal transmitted from the remote control 5. The processing unit 133 decodes the infrared signal received by the remote control light receiving unit 132, generates data indicating the operation content in the remote control 5, and outputs the data to the control unit 160.

The projector device 100 includes a photographing unit 140.
The imaging unit 140 includes an imaging optical system, a camera having an imaging device such as a CCD, an interface circuit, and the like, and images the projection direction of the projection optical system 113 under the control of the control unit 160.
The photographing range of the photographing unit 140, that is, the angle of view is an angle of view in which the range including the screen SC and its peripheral portion is the photographing range. The photographing unit 140 outputs the photographed captured image data to the control unit 160.

  The projector device 100 includes a communication unit 175. The communication unit 175 is an interface that performs data communication. The communication unit 175 can transmit and receive various data to and from other projector devices (not shown) via communication under the control of the control unit 160. In the first embodiment, the communication unit 175 may be a wired interface or a wireless communication interface that performs wireless communication such as a wireless LAN or Bluetooth (registered trademark).

  The projector device 100 includes an image processing system. The image processing system is configured with a control unit 160 that controls the entire projector device 100 as a whole, and further includes an image processing unit 152, a frame memory 155, and a storage unit 170. The control unit 160, the image processing unit 152, and the storage unit 170 are connected to the internal bus 180.

The image processing unit 152 expands the image data input from the image input unit 151 in the frame memory 155 under the control of the control unit 160. The image processing unit 152 performs, for example, resolution conversion (scaling) processing or resizing processing, distortion correction, shape correction processing, digital zoom processing, image color tone and brightness on the image data developed in the frame memory 155. Perform adjustments and other processing. The image processing unit 152 executes processing specified by the control unit 160 and performs processing using parameters input from the control unit 160 as necessary. Of course, the image processing unit 152 can also execute a combination of a plurality of processes.
The image processing unit 152 reads the processed image data from the frame memory 155 and outputs it as display image data to the light modulation device driving unit 122.

The control unit 160 includes hardware such as a CPU, a ROM, and a RAM, all of which are not shown. The ROM is a nonvolatile storage device such as a flash ROM, and stores a control program and data. The RAM constitutes a work area of the CPU. The CPU expands the control program read from the ROM and the storage unit 170 in the RAM, and controls each unit of the projector device 100 by executing the control program expanded in the RAM.
In addition, the control unit 160 includes a projection control unit 161, a photographing control unit 162, and a correction control unit 163 as functional blocks. These functional blocks are realized by the cooperation of the CPU and a control program stored in the ROM or the storage unit 170.

The projection control unit 161 adjusts the display mode of the image on the display unit 110 and controls the projection of the image onto the screen SC.
Specifically, the projection control unit 161 controls the image processing unit 152 to execute image processing on the image data input from the image input unit 151. At this time, the projection control unit 161 may read out parameters necessary for processing by the image processing unit 152 from the storage unit 170 and output the parameters to the image processing unit 152.
In addition, the projection control unit 161 controls the light source driving unit 121 to turn on the light source of the light source unit 111 and instructs the light source unit 111 on the luminance of the light source.
The photographing control unit 162 causes the photographing unit 140 to perform photographing, and acquires photographed image data photographed by the photographing unit 140.

The correction control unit (correction unit) 163 corrects the modulation characteristics (panel characteristics) of the liquid crystal panel of the light modulation device 112, and the brightness, chromaticity (for example, hue and saturation) of the projection image projected by the projector device 100, and the like. The image quality including at least one gradation is adjusted.
The storage unit 170 is a nonvolatile storage device, and is realized by a storage device such as a flash memory, an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), or an HDD (Hard Disc Drive). In addition, the storage unit 170 stores a variation detection pattern, which is image data projected on the screen SC by the display unit 110, and image data of an adjustment pattern.

In the first embodiment, it is assumed that the projector device 100 projects an image on the screen SC as a single unit (one unit), but is not limited thereto. For example, a mode in which a plurality of projector apparatuses share and project one image can be assumed. That is, the projector device 100 and other projector devices (not shown) are arranged adjacent to each other in a certain direction (for example, the horizontal direction), and the projector device 100 and other projector devices share an image in an adjacent region of the screen SC. And project.
In this case, the projector device 100 and the other projector devices are respectively connected to the image supply device 200. For example, the projector device 100 serves as a master, and each projector device is assigned based on an image supplied from the image supply device 200. An image of the area to be projected is projected onto the screen SC.

FIG. 2 is a flowchart showing a flow of adjustment processing (control method) executed when the projector apparatus 100 projects an image.
When the projector device 100 starts projection, the control unit 160 performs correction based on the installation position of the projector device 100 (step S200).
In the first embodiment, the control unit 160 drives the light source and starts projecting a test image having a predetermined marker. Then, the control unit 160 causes the photographing unit 140 to photograph the test image projected on the screen SC, and calculates the coordinate position of the marker from the photographed image. Further, the control unit 160 corrects the geometric deformation or the like of the projected image caused by the installation position based on the coordinate position.

Next, the control unit 160 adjusts the brightness of the light source (step S210). In this case, the control unit 160 may acquire the brightness of the projected image from the captured image, and the projection control unit 161 may automatically adjust the luminance of the light source based on the brightness of the image. The user may operate the remote controller 5 and the projection control unit 161 may adjust the luminance of the light source based on the operation instruction.
Next, the control unit 160 corrects the panel characteristics (step S220) and ends the adjustment process.
FIG. 3 is a flowchart for explaining the details of the process of correcting the panel characteristics (step S220) in the first embodiment. FIG. 4 is a diagram for explaining correction of the photographing value as the characteristic value of the image photographed by the photographing unit 140, and details of the process of correcting the panel characteristic (step S220) will be described with reference to FIG. To do. In the first embodiment, RGB values are used as shooting values.
When this process is started, the control unit 160 initializes a timer that measures the elapsed time (step S230), and measures the time that elapses after the adjustment of the light source is completed.

Next, the control unit 160 waits until a predetermined time has elapsed (step S232). FIG. 4 shows the change in the photographing value (Y) with the passage of time when the horizontal axis is the elapsed time (t: for example, minutes), the vertical axis is the photographing value (Y), and the light source is adjusted. ing. Generally, immediately after the output of the light source is adjusted, the photographing value (Y) may be greatly reduced (fluctuated). Therefore, in the present embodiment, the predetermined time (t0) for waiting is set to 1 minute or less, The effect of fluctuations is avoided.
Next, the control unit 160 selects one adjustment pattern (adjustment image) (step S234). In the first embodiment, the adjustment pattern is a single-color raster image prepared for each color of red (R), green (G), and blue (B), and is created for each preset gradation. It is stored in the storage unit 170. For example, in the case of 8 gradations, 22 adjustment patterns are created. The adjustment pattern is an image in which marks having a predetermined shape are arranged at a plurality of lattice points.

Next, the control unit 160 projects the selected adjustment pattern onto the screen SC, and causes the photographing unit 140 to photograph the adjustment pattern projected onto the screen SC (step S236).
Next, the control unit 160 calculates a captured value from the captured adjustment pattern, and stores the calculated captured value in association with the elapsed time in the storage unit 170 (step S238). In the first embodiment, values such as chromaticity and gradation at the grid points of the image for each color in the photographed adjustment pattern are obtained, and the average value of the obtained values is calculated and used as the photographed value. It is not limited to.
Next, the control unit 160 determines whether or not all (here, 22) adjustment patterns have been photographed (step S240).

Here, when all the adjustment patterns are not photographed (No in step S240), the control unit 160 selects the next adjustment pattern having different color characteristics from the adjustment patterns stored in the storage unit 170. Select (step S242) and return to step S236 to sequentially project.
On the other hand, when all the adjustment patterns are photographed (Yes in step S240), the control unit 160 applies the elapsed time to the correction value for each photographing value of the adjustment pattern stored in the storage unit 170, and obtains the photographing value. Is corrected (step S244).
Here, a method of correcting the photographing value will be described with reference to FIG. In the first embodiment, the correction value is calculated from variation information (approximate expression) indicating the relationship between the elapsed time after adjusting the brightness of the light source and the variation of the photographing value. That is, the control unit 160 approximates the fluctuation of the photographing value Y after the elapsed time t0 by a mathematical expression, that is, a quadratic approximation represented by the following formula (1). In the first embodiment, 22 shooting values Y are stored. However, in FIG. 4, description is limited to 4 shooting values Y out of 22.

In Equation (1), a, b, and c are constants, which are determined in advance according to the conditions for applying the correction, that is, for each model of the projector apparatus 100 and the adjustment amount of the light source, and are stored in the storage unit 170 as a table. ing. The variation information is not limited to a mathematical expression such as an approximate expression, and may be in the form of a numerical table. In addition, when the user uses the projector device 100, the photographing unit 140 may detect the brightness variation accompanying the time variation, and the constant value may be corrected based on the detection result.
Here, the control unit 160 reads the photographing value Y1 stored in the storage unit 170 and the elapsed time t1. The control unit 160 sets a value obtained by applying the elapsed time t1 to the equation (1) and a value obtained by applying the elapsed time t4 at which the last photographed image value (Y4) is obtained to the equation (1). And the correction value Y′1 at the elapsed time t1 is calculated. The correction value Y′1 indicates a photographing value that may be obtained when the output of the light source is stable at the elapsed time t4.

  Next, the control unit 160 reads the photographing value Y2 stored in the storage unit 170 and the elapsed time t2. Similarly, the control unit 160 applies the value obtained by applying the elapsed time t2 to the expression (1) and the value obtained by applying the elapsed time t4 to the expression (1) to the following expression (3), and the elapsed time t2 A correction value Y′2 is calculated.

  Next, the control unit 160 reads the captured value Y3 and the elapsed time t3 stored in the storage unit 170. Similarly, the control unit 160 applies the value obtained by applying the elapsed time t3 to the expression (1) and the value obtained by applying the elapsed time t4 to the expression (1) to the following expression (4), and the elapsed time t3 A correction value Y′3 is calculated.

  Next, the control unit 160 reads the photographing value Y4 stored in the storage unit 170 and the elapsed time t4. Since the elapsed time t4 is the last shooting, the correction value Y′4 becomes the shooting value Y4 as shown in the following equation (5).

Returning to FIG. 3, the control unit 160 calculates an adjustment value from the correction value, that is, the corrected photographing value (step S246). In the first embodiment, an average value of correction values for each adjustment pattern is calculated and used as an adjustment value. The adjustment value may be calculated by comparing with a predetermined target value. For example, when an image is shared and projected by a plurality of projector apparatuses, the difference between the photographing values of the plurality of projector apparatuses may be determined to be a reference value or less.
Next, the control unit 160 corrects the image quality by correcting the panel characteristics based on the adjustment value (step S248), and ends the process.
Note that as a method of correcting the panel characteristics by calculating the adjustment value from each lattice point, for example, a method disclosed in JP-A-2002-72359 can be employed.

According to Embodiment 1 described above, there exist the following effects.
(1) When the output of the light source is changed, the adjustment pattern is sequentially projected and shot until the output of the light source is stabilized, and the shooting value is calculated. Then, by correcting the shooting value based on the elapsed time after changing the output of the light source, the shooting value that will be obtained when the output of the light source is stabilized is acquired, and based on the acquired shooting value The panel characteristics of the liquid crystal panel of the light modulation device 112 are corrected. Therefore, it is not necessary to wait for a certain period of time until the output of the light source is stabilized, and the time required for adjusting the projector device 100 can be shortened.

  (2) Preliminary parameters for correction of shooting values are stored in advance, and parameters are determined according to the conditions for applying corrections. Since approximate equations that match the application conditions can be used, shooting values can be corrected with high accuracy. it can.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described. In the first embodiment, the process of correcting the panel characteristics (step S220) is obtained when the change in the photographing value Y considering the passage of time is approximated by a quadratic function corresponding to the application condition, and the output of the light source is stabilized. In the second embodiment, the temporal change of the light source is measured, and the captured value is corrected in consideration of the measured temporal change.
In the adjustment process shown in FIG. 2, step S200 and step S210 are the same as those in the first embodiment, and a description thereof will be omitted. In addition, the configuration of the projector device 100 according to the second embodiment is the same as the configuration according to the first embodiment, and thus the description regarding the configuration of the projector device 100 is omitted.

FIG. 5 is a flowchart for explaining the details of the process of correcting the panel characteristic (step S220) in the second embodiment. FIG. 6 is a diagram for explaining correction of photographing values (RGB values) photographed by the photographing unit 140, and details of processing for correcting panel characteristics (step S220) will be described with reference to FIG. .
When this process is started, the control unit 160 initializes a timer that measures the elapsed time (step S250), and measures the time that elapses after the adjustment of the light source is completed.
Next, the control unit 160 waits until a predetermined time elapses (step S252). In FIG. 6, the horizontal axis is the elapsed time (t), the vertical axis is the shooting value (Y), and the change in the shooting value (Y) with the passage of time when the light source is adjusted is shown. In general, immediately after the output of the light source is adjusted, the photographing value (Y) may greatly decrease (fluctuate). Therefore, in this embodiment, the predetermined time tA to stand by is set to 1 minute or less, and due to the fluctuation. The effect is avoided.

Next, the control unit 160 selects a variation detection pattern (reference image) (step S254). In the second embodiment, the variation detection pattern is assumed to be a raster image such as white, red, green, and blue.
Next, the control unit 160 projects the selected variation detection pattern onto the screen SC, and causes the photographing unit 140 to photograph the variation detection pattern projected onto the screen SC (step S256).

Next, the control unit 160 calculates a captured value from the captured variation detection pattern, and stores the calculated captured value in association with the elapsed time in the storage unit 170 (step S258).
Next, the control unit 160 selects one adjustment pattern (step S260). In the second embodiment, the adjustment pattern is a single-color raster image prepared for each color of red (R), green (G), and blue (B), and is created for each preset gradation. It is stored in the storage unit 170. For example, in the case of 8 gradations, 22 adjustment patterns are created. The adjustment pattern is an image in which marks having a predetermined shape are arranged at a plurality of lattice points.

Next, the control unit 160 projects the selected adjustment pattern onto the screen SC, and causes the photographing unit 140 to photograph the adjustment pattern projected onto the screen SC (step S262).
Next, the control unit 160 calculates a captured value from the captured adjustment pattern, and stores the calculated captured value in association with the elapsed time in the storage unit 170 (step S264). In the second embodiment, values such as chromaticity and gradation at the lattice points of the image for each color in the captured adjustment pattern are acquired, and an average value of the acquired values is calculated and used as a shooting value. It is not limited to.
Next, the control unit 160 determines whether or not the planned adjustment pattern has been photographed (step S266). In the second embodiment, a variation detection pattern is photographed three times before the elapsed time tC when the photographing value is stabilized, and about half (about 11 types) of adjustment patterns are photographed before the next variation detection pattern is photographed. Is assumed.

Here, when the planned adjustment pattern is not captured (No in step S266), the control unit 160 selects the next adjustment pattern from the adjustment patterns stored in the storage unit 170 (step S268), The process returns to step S262.
On the other hand, when the planned adjustment pattern is photographed (Yes in step S266), the control unit 160 determines whether or not all the variation detection patterns are photographed (step S270).
Here, when not all the variation detection patterns have been captured (No in step S270), the control unit 160 selects the next variation detection pattern (step S272), and returns to step S256. In the second embodiment, it is assumed that the same variation detection pattern is captured three times, but it may be switched to a different variation detection pattern.

On the other hand, when all the variation detection patterns have been photographed (Yes in step S270), the control unit 160 corrects the photographing value of the adjustment pattern from the two photographed variation detection patterns (step S274).
Here, a method of correcting the photographing value will be described with reference to FIG. In FIG. 6, when tA (first elapsed time) elapses, tB (second elapsed time) elapses, and tC elapses after the adjustment of the light source is completed, the fluctuation detection pattern is imaged, and the captured values (YA, YB). , YC). Further, during the period from tA to tB, that is, at t1, t2, t3 and t4 corresponding to the third elapsed time, the adjustment pattern is photographed, and the photographed values (Y1, Y2, Y3, Y4) are photographed. ) Respectively.

Further, during the period from tB to tC, that is, at t (n−1) and tn, the adjustment pattern is photographed, and the photographed values (Y (n−1), Yn) are calculated. Yes.
The control unit 160 captures the lapsed time between the photographic values (for example, YA (corresponding to the first characteristic value), YB (corresponding to the second characteristic value)) of the variation detection pattern photographed at intervals. And taking the difference (YB-YA) linearly with the elapsed time, the imaging values at the elapsed times t1 to t4 when the adjustment pattern is captured are calculated. Note that the approximation formula (variation information) for interpolation is not limited to the primary approximation formula, but may be a multi-order approximation formula.
For example, for Y1 and Y2 corresponding to the third characteristic value, correction values Y′1 and Y′2 are calculated by the following equations (6) and (7).

  Similarly, the control unit 160 calculates the correction value Y ′ by the following formulas (8) and (9) from the captured values Y (n−1) and Yn at the elapsed times t (n−1) and tn when the adjustment pattern is captured. (N-1) and Y′n are calculated.

According to Embodiment 2 described above, in addition to the effect (1) described in Embodiment 1, the following effects can be obtained.
(3) In addition to photographing a plurality of variation detection patterns at a predetermined time, an adjustment pattern is photographed while a plurality of variation detection patterns are photographed, and the amount of change in the photographing value of the variation detection pattern is linearly interpolated. Thus, in order to correct the photographing value of the adjustment pattern, in addition to fluctuations caused by changing the output of the light source, it is possible to avoid influences such as changes in ambient light and temperature of the projector device 100 and deterioration due to the life of the light source.

As mentioned above, although this invention was demonstrated based on Embodiment 1 and Embodiment 2 which illustrated, this invention is not limited to these embodiment, The modification as described below can also be assumed.
(1) Although the projector apparatus 100 assumes a mode of projecting alone, when projecting an image by sharing a plurality of projector apparatuses, the fact that the image quality correction has been completed in each projector apparatus communicates between the projector apparatuses. May be.

  DESCRIPTION OF SYMBOLS 5 ... Remote control, 100 ... Projector apparatus, 110 ... Display part, 111 ... Light source part, 112 ... Light modulation apparatus, 113 ... Projection optical system, 121 ... Light source drive part, 122 ... Light modulation apparatus drive part, 131 ... Operation panel, 132: Remote control light receiving unit, 133 ... Processing unit, 140 ... Imaging unit, 151 ... Image input unit, 152 ... Image processing unit, 155 ... Frame memory, 160 ... Control unit, 161 ... Projection control unit, 162 ... Shooting control unit, Reference numeral 163: Correction control unit, 170: Storage unit, 175: Communication unit, 180: Internal bus, 200: Image supply device

Claims (10)

A projection unit that projects an image with a light beam emitted from a light source;
A photographing unit for photographing the image projected by the projection unit;
A correction unit for correcting the image quality of the image projected by the projection unit;
The elapsed time that has elapsed since the output of the light source is changed is measured, and based on the variation information that indicates the variation in the characteristic value of the image at the elapsed time, the elapsed time from when the imaging unit has captured the adjustment image And a control unit that corrects the characteristic value of the adjustment image and causes the correction unit to correct the image quality based on the corrected characteristic value. The projector device according to claim 1,
The control unit sequentially projects a plurality of adjustment images having different color characteristics on the projection unit, calculates the characteristic values of the plurality of adjustment images photographed by the photographing unit, and the adjustment image is The variation in the elapsed time taken is acquired based on the variation information, the characteristic value is corrected for each color characteristic based on the acquired variation, and the image quality is corrected based on the corrected characteristic value A projector apparatus that calculates an adjustment value for performing the operation. The projector device according to claim 2,
The correction device corrects at least one of luminance, chromaticity, and gradation of the image projected by the projection unit based on the calculated adjustment value. The projector device according to any one of claims 1 to 3,
The change information is at least one of a mathematical expression and a numerical value table showing a relationship between the elapsed time and the change in the characteristic value. The projector device according to claim 4,
The projector is characterized in that the mathematical expression is a quadratic approximate expression. A projection unit that projects an image with a light beam emitted from a light source;
A photographing unit for photographing the image projected by the projection unit;
A correction unit for correcting the image quality of the image projected by the projection unit;
The elapsed time that has elapsed since the output of the light source is changed is measured, a reference image is projected on the projection unit at the first elapsed time and the second elapsed time, and the photographing unit is photographed. An adjustment image is projected on the projection unit to be photographed by the photographing unit at a third elapsed time from the elapsed time to the second elapsed time, and from the first elapsed time to the second time. The third characteristic value of the adjustment image is corrected by correcting the third characteristic value of the image for adjustment at the third elapsed time based on the fluctuation information indicating the fluctuation of the characteristic value of the reference image up to the elapsed time. A control unit that causes the correction unit to correct the image quality based on the projector. The projector device according to claim 6,
The variation information includes an amount of change between a first characteristic value of the reference image taken at the first elapsed time and a second characteristic value of the reference image taken at the second elapsed time. Is a first-order approximation that approximates
The control unit corrects the third characteristic value by interpolating the variation information according to the third elapsed time. The projector apparatus according to any one of claims 1 to 7,
It has a communication unit that communicates with other projector devices,
The control unit communicates with the other projector device information about whether or not the image quality has been corrected by the correction unit based on the corrected characteristic value.   The elapsed time of measuring the elapsed time since the output of the light source for projecting the image is changed, and shooting the adjustment image based on the fluctuation information indicating the fluctuation of the characteristic value of the image in the elapsed time And correcting the characteristic value of the adjustment image, and correcting the image quality of the image based on the corrected characteristic value.   The elapsed time after the output of the light source for projecting the image is changed is measured, the reference image is projected and photographed at the first elapsed time and the second elapsed time, and the first elapsed time is calculated. A characteristic value of the reference image from the first elapsed time to the second elapsed time after the adjustment image is projected and photographed at a third elapsed time after the second elapsed time. Correcting the third characteristic value of the image for adjustment at the third elapsed time based on fluctuation information indicating the fluctuation of the image, and correcting the image quality of the image based on the corrected third characteristic value. A control method of a projector apparatus characterized by the above.

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