JP2018169267A - Measurement assist device, control method therefor, and program - Google Patents

Abstract

To provide a measurement assist device that assists in measurement that utilizes the dynamic range of a measuring instrument for measuring the emitted light of an image display device that uses a combination of a narrow-band high-intensity light source and a wide-band low-intensity light source as backlight, and a method for controlling the same.SOLUTION: Provided is a measurement assist device that assists in measurement by a measuring instrument 111 that measures the light emitted by an image display device 100 having first light sources 106, 107 and a second light source 105 whose bandwidth is narrower than the first light sources, comprising: first acquisition means for acquiring a measured value when the emission intensity of the second light source is lowered from a first emission intensity to a second emission intensity; second acquisition means for acquiring a parameter for converting a measured value when the second light source emits light with the second emission intensity into a measured value when light is emitted with the first emission intensity; and estimation means for estimating, on the basis of the measured value by the first acquisition means and the parameter, a measured value when the second light source emits light with the first emission intensity.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a measurement support apparatus, a control method thereof, and a program.

In recent years, display standards with a wide color gamut have been proposed, such as the international standard for Super Hi-Vision TV (ITU-R Recommendation BT.2020: Parameter values for UHDTV systems for production and international program exchange). In order to realize a wide color gamut with a liquid crystal display device, an image display device employing a laser instead of a conventional LED (Light Emitting Diode) has been proposed (Patent Document 1 and Patent Document 2). reference).

On the other hand, in order to reproduce a color image with high accuracy by an image display device, it is necessary to measure the display characteristics of each display color with a high-precision measurement device and finely calibrate the image display device. A spectral luminance meter is a measuring device that accurately measures display characteristics of an image display device such as a liquid crystal display device. The spectral luminance meter spectrally separates light with a diffraction grating or the like, and a CCD (Charge-
A spectral characteristic that is the intensity of the dispersed light is measured by an optical sensor such as Coupled Device. The dynamic range of a general optical sensor such as a CCD is about 2000: 1 to 3000: 1.

JP 2014-26132 A JP 2013-246186 A

  However, when the backlight of the liquid crystal display device includes a light source with a remarkably narrow band such as a laser and a light source with a relatively wide band such as an LED, the peak value of the spectrum of the narrow band light source The peak value of the spectrum of the light source is far away. For this reason, when the measurement condition of the spectral luminance meter is measured in accordance with the peak of the emission spectrum of the narrow-band light source, the emission spectrum of the broadband light source is measured by a part of the measurable range of the optical sensor. For this reason, the measurement resolution of the spectral luminance meter may be lower than that in the case where measurement is performed according to the emission spectrum of a broadband light source, which may cause an error in measurement. Therefore, the present invention supports a measurement that effectively uses the dynamic range of a measuring device that measures the emitted light of an image display device that is used as a backlight by mixing a light source having a narrow band with high emission intensity and a light source having a wide band with low emission intensity. An object of the present invention is to provide a measurement support apparatus and a control method thereof.

The first aspect of the present invention is:
Measuring light emitted from a display device having a plurality of light sources including a first light source that emits light of a first color and a second light source that emits light of a second color and has a narrower band than the first light source. A measurement support device for supporting measurement by the measurement device,
A first measurement value obtained by the measuring device is obtained when the emission intensity of the second light source is decreased from the first emission intensity to a second emission intensity lower than the first emission intensity. Acquisition means of
The measurement value measured by the measurement device when the second light source is caused to emit light at the second emission intensity, and the measurement device when the second light source is caused to emit light at the first emission intensity. Second acquisition means for acquiring a parameter used in the conversion process for converting into a measurement value measured by
Estimating means for estimating a measured value of the measuring device when the second light source emits light at the first emission intensity based on the measured value and the parameter acquired by the first acquiring means; ,
It is a measurement assistance apparatus characterized by having.

The second aspect of the present invention is:
Light emitted from an image display device having a plurality of light sources including a first light source that emits light of a first color and a second light source that emits light of a second color and has a narrower band than the first light source. A method for controlling a measurement support apparatus that supports measurement of a measurement apparatus to be measured,
A first measurement value obtained by the measuring device is obtained when the emission intensity of the second light source is decreased from the first emission intensity to a second emission intensity lower than the first emission intensity. The acquisition step of
The measurement value measured by the measurement device when the second light source is caused to emit light at the second emission intensity, and the measurement device when the second light source is caused to emit light at the first emission intensity. A second acquisition step of acquiring a parameter used in the conversion process for converting into a measurement value measured by
An estimation step for estimating a measurement value of the measurement device when the second light source emits light at the first emission intensity based on the measurement value and the parameter acquired in the first acquisition step; ,
It is a control method of the measurement assistance apparatus characterized by having.

  A third aspect of the present invention is a program for causing a computer to execute each step of the control method of the measurement support apparatus according to the present invention.

  The present invention enables measurement that effectively utilizes the dynamic range of a measuring device that measures the emitted light of an image display device that is used as a backlight by mixing a light source with a narrow band with high emission intensity and a light source with a wide band with low emission intensity. .

The block diagram which shows schematic structure of an image display apparatus and a measurement assistance apparatus Transmission characteristics of each color filter of the liquid crystal panel Spectral characteristics when the image display device displays white Control flow chart of measurement system according to embodiment 1 The flowchart which specifies the wavelength range in which the emitted light intensity which concerns on Example 1 is converted. Control flow chart of measurement system according to embodiment 2 Example of matrix with tristimulus values according to embodiment 2

<Example 1>
The measurement method of the image display apparatus according to Example 1 will be specifically described with reference to the drawings. The measurement method of the image display device according to the present embodiment is applied to measure the emitted light of the image display device using a backlight having a plurality of light sources having different narrow bands and wide bands using a spectral luminance meter. A case is assumed.

FIG. 1 is a block diagram illustrating a schematic configuration of a measurement system according to the present embodiment. The measurement system according to this embodiment includes an image display device 100, a computer 110, and a measurement device 111. The image display apparatus 100 further includes a control unit 101, R-Gain 102, G-Gain 103, B
-Gain 104, R-laser 105, G-LED 106, B-LED 107, backlight 108, and liquid crystal panel 109 are provided.

  The control unit 101 controls the image display device 100. The control unit 101 controls the backlight 108 and the liquid crystal panel 109. For example, the control unit 101 controls the light emission of the light source included in the backlight 108 to change the light emission intensity of each color corresponding to each light source. The control unit 101 controls the modulation of the liquid crystal panel 109 to display a desired image. Note that the control of the control unit 101 may be executed by an instruction from the computer 110.

  The backlight 108 is a light emitting unit composed of a plurality of light sources, and irradiates the liquid crystal panel 109 from the back side. The backlight 108 according to the present embodiment is assumed to include a light source having a narrow spectral line width and high emission intensity, and a light source having a wide spectral line width and relatively low emission intensity. In this specification, a narrow spectral line width is also expressed as a narrow band, and a wide spectral line width is also expressed as a wide band. The narrow-band light source is, for example, a laser, and the wide-band light source is, for example, an LED. However, the kind of light source described here is an example, and the light source used in this embodiment is not limited to this. In this embodiment, the backlight 108 includes a light source that emits red, blue, and green. The light source that emits red light is a laser, and the light source that emits green light and the light source that emits blue light are LEDs. Further, the backlight 108 may include a light guide member or a diffusion member. The combination of red, blue and green colors of the light source is an example, and other combinations may be used. Further, the correspondence between the color and type of the light source is not limited to the example described here.

  The R-laser 105 is a red light source provided in the backlight 108. The G-LED 106 is a green light source provided in the backlight 108. The B-LED 107 is a blue light source provided in the backlight 108. The R-Gain 102 adjusts the emission intensity of the R-laser 105 based on the set gain value. The G-Gain 103 adjusts the emission intensity of the G-LED 106 based on the set gain value. The B-Gain 104 adjusts the emission intensity of the B-LED 107 based on the set gain value. The R-laser 105, the G-LED 106, and the B-LED 107 emit light with brightness according to the set gain value.

The liquid crystal panel 109 is a transmissive panel that displays a desired image by modulating light emitted from the backlight 108. In the following, an example in which the image display device 100 according to the present embodiment is a transmissive liquid crystal display device will be described. However, the image display device 100 according to the present embodiment is not limited to a transmissive liquid crystal display device. . The image display apparatus 100 according to the present embodiment may be an image display apparatus having a light emitting unit and a display unit that displays an image on a screen by modulating light from the light emitting unit based on image data. For example, the image display device 100 according to the present embodiment may be a reflective liquid crystal display device. In addition, the image display apparatus 100 according to the present embodiment is provided with a MEMS (Micro Electro Mechanical) instead of the liquid crystal element.
(System) A MEMS shutter type display device using a shutter may be used.

The computer 110 is a measurement support apparatus that supports measurement by the measurement system shown in FIG. The computer 110 acquires a measurement value obtained by the measurement device 111. Further, the computer 110 calculates a parameter related to the conversion process of the measurement value of the emission intensity of the narrow band light source of the backlight 108 based on the measurement value by the measurement device 111. Further, the computer 110 performs measurement in a state before the light emission intensity of the narrow-band light source is reduced based on the measurement value obtained by the measurement device 111 when the light emission intensity of the narrow-band light source is reduced and the above-described parameters. Estimate the value. The acquisition of the measurement value from the measurement apparatus 111 and the control of the operation of the image display apparatus 100 may be executed manually by the measurer, or may be executed in whole or in part by the computer 110. For example, as shown in FIG. 1, the computer 110 is connected to the image display device 100 and the measurement device 111 through control lines, and the computer 110 controls operations related to measurement processing described later, whereby an automatic measurement system may be configured. . Alternatively, the measurement value obtained by the measurement device 111 may be manually input by a measurer or the like.

  The measuring device 111 is a spectral luminance meter, and can measure luminance and chromaticity with a built-in spectroscope. The measuring device 111 may be controlled by an instruction from the computer 110 or may be manually controlled by a measurer. The measurement device 111 has a function of adjusting the exposure time so that an optical sensor such as a CCD of the spectroscope is not saturated when performing the measurement. In addition, the measuring device 111 may be capable of changing the measurable range by setting. For example, the measurement apparatus 111 may increase the upper limit value of the measurable range by decreasing the lower limit value of the measurable range by increasing the exposure time and shortening the exposure time.

  FIG. 2 is a diagram illustrating the transmission characteristics of the filter of the liquid crystal panel 109 according to the present embodiment. The horizontal axis indicates the wavelength in the visible light region, and the vertical axis indicates the normalized transmittance. The solid line, the broken line, and the dotted line correspond to the transmission characteristics of the green, red, and blue filters, respectively.

FIG. 3A shows spectral characteristics of emitted light when the image display apparatus 100 according to the present embodiment performs white display. In the state of FIG. 3A, the display color of the image display apparatus 100 is CIE 1976.
This corresponds to the case where the u′v ′ chromaticity coordinates are adjusted to (0.194, 0.469) in the UCS chromaticity diagram. The horizontal axis in FIG. 3A indicates the wavelength in the visible light region, and the vertical axis indicates the emission intensity. In this case, the peak intensity of the spectrum 901 by the R-laser 105 is about 11 times higher than the peak intensity of the spectrum 902 by the G-LED 106 and the spectrum 903 by the B-LED 107.

  FIG. 3B shows the spectral characteristics of the emitted light when the image display apparatus 100 according to the present embodiment performs white display in a state where the emission intensity of the R-laser 105 is reduced. In the state of FIG. 3B, the display color of the image display device 100 corresponds to the case where the u′v ′ chromaticity coordinate is adjusted to (0.109, 0.444) in the CIE 1976 UCS chromaticity diagram. Similar to FIG. 3A, the horizontal axis of FIG. 3B indicates the wavelength in the visible light region, and the vertical axis indicates the emission intensity. In FIG. 3B, the gain of the R-laser 105 is reduced to 1/11 in the case of FIG. 3A. For this reason, the peak intensity of the spectrum 905 by the R-laser 105 is approximately the same as the peak intensity of the spectrum 906 by the G-LED 106 and the spectrum 907 by the B-LED 107. When measuring the emitted light of the image display apparatus 100 in the state of FIG. 3B with the measuring device 111, the peak intensity of each spectrum is the same, so each spectrum is measured with the same resolution. When the measurable range of the measuring device 111 is variable, the upper limit value of the measurable range is matched to the peak intensity of each spectrum, thereby making it possible to perform measurement using the dynamic range of the measuring device 111 effectively. In addition, the state of FIG. 3A assumes the state where the image display apparatus 100 is used normally, for example. Further, as will be described later, the state of FIG. 3B assumes a case where the emission intensity of the light source in a narrow band is intentionally reduced, for example, at the time of measurement for calibration.

  A measurement processing flow according to the present embodiment will be described with reference to the flowchart of FIG. In step S <b> 101, the control unit 101 sets G-Gain 103 and B-Gain 104 to a minimum and sets a condition that red is lit alone. In this state, the measuring device 111 measures an appropriate exposure time for the light emitted from the image display device 100. Then, the computer 110 acquires the appropriate exposure time measured by the measuring device 111.

In step S <b> 102, the control unit 101 restores G-Gain 103, minimizes R-Gain 102, and sets a condition in which green lights alone. In this state, the measuring device 111
Measures the appropriate exposure time for the light emitted by the image display device 100. Then, the computer 110 acquires the appropriate exposure time measured by the measuring device 111.

  In step S <b> 103, the control unit 101 restores the B-Gain 104, minimizes the G-Gain 103, and sets the condition that the blue light alone is turned on. In this state, the measuring device 111 measures an appropriate exposure time for the light emitted from the image display device 100. Then, the computer 110 acquires the appropriate exposure time measured by the measuring device 111.

  In step S104, the computer 110 calculates a control value for reducing the emission intensity of the R-laser 105 based on the appropriate exposure time measured in steps S101 to S103. For example, the computer 110 stores the appropriate exposure time acquired in step S101 when only the R-laser 105 is turned on as t1. In addition, the computer 110 stores, as t2, an appropriate exposure time measured when only a light source having the highest emission spectrum intensity is turned on among broadband light sources (LEDs in this embodiment). In this case, the computer 110 can reduce the emission intensity of the R-laser 105 to the same level as the emission intensity of the broadband light source by multiplying the gain of the R-laser 105 by t1 / t2. Note that the above-described control method of the R-laser 105 is an example, and other methods may be used as long as the emission intensity is reduced to the same level as the emission intensity of a broadband light source.

  In step S105, the control unit 101 decreases the emission intensity of the R-laser 105 based on the control value calculated in step S104. As a result, as shown in FIG. 3B, the emission intensity of the R-laser 105 is reduced to the same level as the emission intensity of the LED. When the upper limit value of the measurable range of the measuring device 111 is fixed, the control unit 101 may reduce the emission intensity of the R-laser 105 to the upper limit value of the measurable range of the measuring device 111.

  In step S106, the measurable range of the measuring device 111 is adjusted. For example, when the measurable range of the emission intensity can be changed by adjusting the exposure time of the measuring apparatus 111, the upper limit value of the measurable range is adjusted to be approximately the same as the emission intensity adjusted in step S105. The Note that when the measuring apparatus 111 automatically performs this adjustment, the process of step S106 is omitted. This adjustment may be performed manually by the measurer or may be performed based on control by the computer 110.

  In step S107, a parameter for estimating a measurement value by the measurement device 111 before the emission intensity is reduced is calculated from a measurement value by the measurement device 111 in a state where the emission intensity of the R-laser 105 is reduced. As an example of the parameter calculation method, for example, the ratio of the appropriate exposure time obtained in step S104 may be used as the parameter. Of the spectral characteristics acquired by the measuring device 111 in a state where the emission intensity of the R-laser 105 is lowered, only the wavelength range of the emission spectrum of the R-laser 105 may be multiplied by t2 / t1. . Alternatively, the correspondence relationship between the ratio (t2 / t1) of the appropriate exposure time and the change in the light emission intensity (for example, how many times the light emission intensity is increased) is acquired in advance, and the appropriate exposure time acquired in step S104 is obtained. The conversion of the light emission intensity may be determined by the ratio (t2 / t1). Note that a method for specifying a part of the emission spectrum (wavelength range in which the emission intensity is converted) of the R-laser 105 among the spectral characteristics acquired by the measuring apparatus 111 will be described later.

In step S108, the computer 110 performs image quality adjustment (calibration) of the image display apparatus 100 using the parameters calculated in step S107. Hereinafter, the process of step S108 will be described in detail. The measuring device 111 measures the image display device 100 when the emission intensity of the R-laser 105 is lowered. The computer 110 acquires a measurement value obtained by the measurement device 111 in this case. Further, the computer 110 estimates a measured value before the emission intensity of the R-laser 105 is lowered from the parameter calculated in step S107 and the measured value when the emission intensity of the R-laser 105 is lowered. In the present embodiment, the measuring apparatus 111 acquires spectral characteristics (emission intensity with respect to wavelength) as measurement values. The measurement before reducing the emission intensity of the R-laser 105 as shown in FIG. 3A from the measurement value obtained by the measuring device 111 when the emission intensity of the R-laser 105 as shown in FIG. A measured value by the device 111 is estimated. Further, the computer 110 performs image quality adjustment (calibration) such as color adjustment and γ characteristics based on the estimated measurement value. In step S109, the control unit 101 returns the emission intensity of the R-laser 105 to the emission intensity before the decrease.

  Next, a method for identifying the portion of the emission spectrum by the R-laser 105 among the spectral characteristics acquired by the measuring apparatus 111 referred to in step S107 will be described with reference to the flowchart of FIG. In executing the flow of FIG. 5, it is assumed that spectral characteristics including the wavelength region of the emission spectrum of the R-laser 105 are acquired in advance. Further, as spectral characteristic data, it is assumed that tabular data corresponding to the discretized emission intensity (referred to as An) with respect to the discretized wavelength (referred to as λn) is prepared.

  In step S201, the computer 110 sets one wavelength among the plurality of discrete wavelengths described above as a processing target. Here, it is assumed that the computer 110 selects λn as an object to be processed and further acquires the emission intensity An corresponding to λn. In step S202, the computer 110 determines whether An is equal to or less than a threshold value. If An exceeds the threshold value (step S202: NO), the process proceeds to step S203. If An is equal to or smaller than the threshold (step S202: YES), the process proceeds to step S204.

  In step S203, the computer 110 determines that the light emission intensity at λn is to be converted by the parameter, and stores λn. In step S204, the computer 110 determines whether λn is the last wavelength among the discrete wavelengths of the spectral characteristic data. If λn is the last wavelength (step S204: YES), this flow ends. If λn is not the last wavelength (step S204: NO), the process returns to step S201, and proceeds to the subsequent processes using λn + 1 as the processing target.

  By executing the flow of FIG. 5, the wavelength range whose emission intensity is to be converted by the parameter is specified. The flow in FIG. 5 assumes a case where the emission spectrum by the R-laser 105 does not overlap with the emission spectrum by another broadband light source. However, when it overlaps with the emission spectrum of the broadband light source, this flow can be executed by considering the influence of the emission spectrum of the broadband light source. For example, if the wavelength range or emission intensity of the emission spectrum of a broadband light source is known, the threshold value is set by excluding the affected wavelength range from the processing target or by taking into account the emission spectrum intensity of the broadband light source. This flow can be executed.

  As a result, in step S106, measurement that effectively uses the dynamic range of the measurement apparatus is performed, and high-precision image quality adjustment is realized based on the spectral characteristics measured with improved measurement accuracy. That is, a measurement that effectively utilizes the dynamic range of a measuring device that measures light emitted from an image display device that is used as a backlight by mixing a light source having a high emission intensity in a narrow band and a light source having a low emission intensity in a wide band is realized.

In the flowchart of FIG. 4, the control of the control unit 101 of the image display apparatus 100 and the operation control of the measurement apparatus 111 may be manually executed by a measurer, or part or all of the control may be performed from the computer 110. It may be executed based on the instruction. In that case, the measurement system according to the present embodiment can be constructed as an automatic measurement system.

<Example 2>
In this embodiment, an example in which the conversion method from the measurement value when the light emission intensity of the light source of the narrow band is reduced to the measurement value before the reduction is different from the first embodiment is shown. The configuration of the image display apparatus 100 is the same as that of the first embodiment. Next, the difference between the control flow of the measurement system of the second embodiment and that of the first embodiment will be described with reference to the flowchart of FIG. 6 that have the same reference numerals as those in FIG. 4 have the same processing.

  In step S301, each light source of the backlight 108 emits light with the light emission intensity set at the initial stage. The liquid crystal panel 109 modulates the transmitted light to be red. Further, the measuring device 111 measures transmitted light.

  In step S302, the liquid crystal panel 109 modulates the transmitted light so that it becomes green. And the measuring apparatus 111 measures the transmitted light. In step S303, the liquid crystal panel 109 modulates the transmitted light to be blue. And the measuring apparatus 111 measures the transmitted light. That is, in step S301 to step S303, the image display apparatus 100 sequentially displays red, blue, and green in a state where the backlight 108 emits light with the standard emission intensity, and the measurement apparatus 111 performs measurement for each color. .

  In step S <b> 304, the control unit 101 sets a preset reduction ratio of the emission intensity of the narrow-band light source to R-Gain 102. Then, the emission intensity of the R-laser 105, which is a narrow band light source, decreases according to the set value.

  In step S305, the liquid crystal panel 109 modulates the transmitted light to red with the emission intensity of the R-laser 105 of the backlight 108 lowered. Then, the measuring device 111 measures the transmitted light.

  In step S306, the liquid crystal panel 109 modulates the transmitted light to become green. Then, the measuring device 111 measures the transmitted light. In step S307, the liquid crystal panel 109 modulates the transmitted light to be blue. Then, the measuring device 111 measures the transmitted light. That is, in step S305 to step S307, the image display device 100 sequentially displays red, blue, and green in a state where the emission intensity of the R-laser 105 of the backlight 108 is reduced, and the measurement device 111 measures each color. I do.

  Note that the display gradation data used for the liquid crystal panel 109 in step S301 and step S305, step S302 and step S306, and step S303 and step S307 is the same for each color.

  In step S308, a conversion matrix (parameter) relating to a decrease in the emission intensity of the R-laser 105 is created using the measurement results in steps S301 to S303, step S305, and step S307. Hereinafter, creation of a transformation matrix will be described.

FIG. 7A is a 3 × 3 matrix generated by arranging tristimulus values obtained based on the spectral characteristics measured in steps S301 to S303 for each color display. FIG. 7B is a 3 × 3 matrix generated by arranging tristimulus values obtained based on the spectral characteristics measured in steps S305 to S307 for each color display. FIG. 7C is an inverse matrix of the matrix of FIG. 7B. FIG. 7D is a transformation matrix generated by multiplying the matrix of FIG. 7A by the matrix of FIG. 7C. When the matrix in FIG. 7A and the matrix in FIG. 7B are expressed as A and B, respectively, the matrices in FIGS. 7C and 7D can be expressed as B ⁻¹ and AB ⁻¹ , respectively.

In step S309, the measurement device 111 performs measurement for image quality adjustment (calibration) with the emission intensity of the R-laser 105 lowered. The measurement value obtained by the measuring device 111 is converted into a tristimulus value and expressed as C. Then, the measured value (C) in a state where the emission intensity of the R-laser 105 is lowered is measured by the conversion matrix calculated in step S301 (X and the measured value before the emission intensity of the R-laser 105 is lowered). To be converted). Specifically, the measured value of the state before reducing the emission intensity of the R-laser 105 is estimated by the conversion X = AB ⁻¹ C. Then, the computer 110 performs image quality adjustment (calibration) using the calculated measurement value (X).

  According to the present embodiment, measurement that effectively uses the dynamic range of the measurement apparatus is performed, and high-accuracy image quality adjustment is realized based on tristimulus values measured with improved measurement accuracy. That is, a measurement that effectively utilizes the dynamic range of a measuring device that measures light emitted from an image display device that is used as a backlight by mixing a light source having a high emission intensity in a narrow band and a light source having a low emission intensity in a wide band is realized.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

  In addition, Example 1-2 is an example to the last, and the structure obtained by changing and changing suitably the structure of Example 1-2 within the range of the summary of this invention is also contained in this invention. Configurations obtained by appropriately combining the configurations of Examples 1 and 2 are also included in the present invention.

100: Image display device 105: R-laser 106: G-LED 107: B-LED 110: Computer 111: Measuring device

Claims (15)

Light emitted from an image display device having a plurality of light sources including a first light source that emits light of a first color and a second light source that emits light of a second color and has a narrower band than the first light source. A measurement support device for supporting measurement of a measurement device to be measured,
A first measurement value obtained by the measuring device is obtained when the emission intensity of the second light source is decreased from the first emission intensity to a second emission intensity lower than the first emission intensity. Acquisition means of
The measurement value measured by the measurement device when the second light source is caused to emit light at the second emission intensity, and the measurement device when the second light source is caused to emit light at the first emission intensity. Second acquisition means for acquiring a parameter used in the conversion process for converting into a measurement value measured by
Estimating means for estimating a measured value of the measuring device when the second light source emits light at the first emission intensity based on the measured value and the parameter acquired by the first acquiring means; ,
A measurement support apparatus comprising: The image display device further includes a third light source that emits light of a third color,
The measurement support apparatus according to claim 1, wherein the first color, the second color, and the third color correspond to any one of blue, green, and red. The second emission intensity is substantially the same as the emission intensity of the first light source,
The second acquisition means includes the appropriate exposure time of the measuring device when the second light source emits light alone with the first light emission intensity, and the measurement when the first light source emits light alone. The measurement support apparatus according to claim 1, wherein the parameter is calculated based on an appropriate exposure time of the apparatus. 4. The measurement support apparatus according to claim 1, wherein the estimation unit estimates a spectral characteristic of the second light source that emits light with the first emission intensity as the measurement value. 5. . The second acquisition means includes
The measurement in which the second light source emits light at the first emission intensity and measures light emitted from the image display device that sequentially displays the first color, the second color, and the third color. Three measurements of the device;
The measurement in which the second light source emits light at the second emission intensity and measures light emitted from the image display device that sequentially displays the first color, the second color, and the third color. Three measurements of the device;
The measurement support apparatus according to claim 2, wherein the parameter is calculated based on the parameter. The measurement support apparatus according to claim 5, wherein the measurement value is a tristimulus value. The first light source is a laser;
The measurement support apparatus according to claim 1, wherein the second light source is an LED. Light emitted from an image display device having a plurality of light sources including a first light source that emits light of a first color and a second light source that emits light of a second color and has a narrower band than the first light source. A method for controlling a measurement support apparatus that supports measurement of a measurement apparatus to be measured,
A first measurement value obtained by the measuring device is obtained when the emission intensity of the second light source is decreased from the first emission intensity to a second emission intensity lower than the first emission intensity. The acquisition step of
The measurement value measured by the measurement device when the second light source is caused to emit light at the second emission intensity, and the measurement device when the second light source is caused to emit light at the first emission intensity. A second acquisition step of acquiring a parameter used in the conversion process for converting into a measurement value measured by
An estimation step for estimating a measurement value of the measurement device when the second light source emits light at the first emission intensity based on the measurement value and the parameter acquired in the first acquisition step; ,
A method for controlling a measurement support apparatus, comprising: The image display device further includes a third light source that emits light of a third color,
The control of the measurement support apparatus according to claim 8, wherein the first color, the second color, and the third color correspond to any one of blue, green, and red. Method. The second emission intensity is substantially the same as the emission intensity of the first light source,
In the second acquisition step, the appropriate exposure time of the measuring device when the second light source emits light alone with the first light emission intensity, and the measurement when the first light source emits light alone. 10. The method for controlling a measurement support apparatus according to claim 8, wherein the parameter is calculated based on an appropriate exposure time of the apparatus. 11. The measurement support according to claim 8, wherein in the estimation step, a spectral characteristic of the second light source that emits light at the first emission intensity is estimated as the measurement value. 11. Control method of the device. In the second acquisition step,
The measurement in which the second light source emits light at the first emission intensity and measures light emitted from the image display device that sequentially displays the first color, the second color, and the third color. Three measurements of the device;
The measurement in which the second light source emits light at the second emission intensity and measures light emitted from the image display device that sequentially displays the first color, the second color, and the third color. Three measurements of the device;
10. The method of controlling a measurement support apparatus according to claim 9, wherein the parameter is calculated based on the parameter. The method according to claim 12, wherein the measurement value is a tristimulus value. The first light source is a laser;
The method for controlling a measurement support apparatus according to claim 8, wherein the second light source is an LED.   The program for making a computer perform each step of the control method of the measurement assistance apparatus of any one of Claims 8-14.

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