WO2018230164A1

WO2018230164A1 - Two-dimensional color measurement device and two-dimensional color measurement method

Info

Publication number: WO2018230164A1
Application number: PCT/JP2018/016700
Authority: WO
Inventors: 宜弘西川
Original assignee: コニカミノルタ株式会社
Priority date: 2017-06-14
Filing date: 2018-04-25
Publication date: 2018-12-20
Also published as: JPWO2018230164A1; JP7070568B2

Abstract

This two-dimensional color measurement device comprises a two-dimensional imaging unit that has two-dimensionally arranged first pixels and images a color image displayed on a color display screen (for example, a DUT screen) and a determination unit that sets a plurality of light measurement areas including two or more of the first pixels so as to correspond to a plurality of measurement areas and determines a plurality of measurement-area measured light amounts corresponding to each of the plurality of measurement areas. For each of the plurality of measurement areas, the determination unit carries out first processing in which a plurality of set positions for the light measurement area corresponding to the measurement area are set and the measured light amount for the measurement area is determined on the basis of the measurement-area measured light amounts obtained at each of the set positions.

Description

Two-dimensional color measuring device and two-dimensional color measuring method

The present invention is a technique relating to setting of a photometric area in colorimetry on a color display screen.

The color measuring device calculates the light measurement amount based on the color image information signal obtained from the measurement object, and calculates the chromaticity and luminance of the measurement object based on the light measurement amount. The photometric quantity is a generic term for chromaticity and luminance obtained by performing arithmetic processing from the color image information signal (X signal, Y signal, Z signal) output from the two-dimensional image sensor and the color image information signal. It is a physical quantity.

The two-dimensional color measurement device includes a two-dimensional image sensor and has a feature that can measure a plurality of measurement regions simultaneously, and is used for color measurement of a two-dimensional region. The two-dimensional region is a screen of a color display such as a liquid crystal display or an organic electroluminescence display.

As an example of a two-dimensional color measuring device, Patent Document 1 discloses a first, second, and third optical filter that splits light from a sample into three, and the first, second, and third optical filters. Two-dimensional light receiving detection means for receiving the passed light at a plurality of measurement points on the sample surface, a spectral detection means for detecting spectral radiance for light from a specific point among the measurement points, and the detected above An arithmetic means for calculating a tristimulus value at a measurement point other than the specific point using a relationship between the tristimulus value calculated based on the spectral radiance and the detection result of the two-dimensional light receiving detection means at the specific point; Are disclosed.

FIG. 7 is a diagram showing a relationship between a color display (DUT = Device Under Test) to be measured and the two-dimensional colorimetric apparatus 300. A DUT screen (hereinafter referred to as DUT screen 1) has pixels arranged two-dimensionally. Similarly, the two-dimensional image sensor provided in the two-dimensional colorimetric apparatus 300 has pixels arranged two-dimensionally. Hereinafter, the pixel of the two-dimensional image sensor is referred to as a first pixel, and the pixel of the DUT screen 1 is referred to as a second pixel. For example, the second pixel includes a pair of red Sub-Pixel, green Sub-Pixel, and blue Sub-Pixel.

In the standard for measuring chromaticity and luminance, the number of second pixels constituting the measurement region is determined to be 500 or more (for example, IEC 62341-5-3 Measuring methods of image sticking and lifetime). Therefore, a case where the number of second pixels constituting the measurement region is 500 will be described. In the case of a DUT having a structure in which a red Sub-Pixel, a green Sub-Pixel, and a blue Sub-Pixel are repeatedly arranged only in the horizontal direction, Sub-Pixels of the same color are arranged in the vertical direction. No need to think. Therefore, since it may be considered in one dimension in the horizontal direction, the number of pixels in the measurement region may be considered in the measurement region where 22.4 (= √500) which is the square root of the number 500 of the second pixels. For this reason, an area corresponding to the number 22.4 of the second pixels is a photometric area. However, there is a difference in the number of red sub-pixels, the number of green sub-pixels, and the number of blue sub-pixels depending on the set position of the photometric area. FIG. 23 is an explanatory diagram for explaining the relationship between the set position of the photometry area 33-2 and the number of Sub-Pixels 11 of each color in the photometry area 33-2. 0 to 24 arranged in the horizontal direction in the figure indicate the order of the second pixels 13. For example, “0” indicates the 0th second pixel 13. Example 1, Example 2, and Example 3 are different in the setting position of the photometric area 33-2. In the case of Example 1, the number of red Sub-Pixels 11-r is 22, the number of green Sub-Pixels 11-g is 23, and the number of blue Sub-Pixels 11-b is 23. In the case of Example 2, the number of red Sub-Pixels 11-r is 23, the number of green Sub-Pixels 11-g is 22, and the number of blue Sub-Pixels 11-b is 23. In the case of Example 3, the number of red Sub-Pixels 11-r is 23, the number of green Sub-Pixels 11-g is 23, and the number of blue Sub-Pixels 11-b is 22.

The present inventor calculated the chromaticity xy for each of Example 1, Example 2, and Example 3 when the DUT is LCD (Liquid Crystal Display). Similarly, when the DUT is OLED (Organic Light Emitting Diode), the chromaticity xy was calculated for each of Example 1, Example 2, and Example 3. Since LCD and OLED have different spectral radiance, LCD and OLED have different chromaticity xy values. FIG. 24 is a graph showing the spectral radiance of the LCD. FIG. 25 is a graph showing the spectral radiance of the OLED. 24 and 25, the horizontal axis indicates the wavelength, and the vertical axis indicates the spectral radiance.

Table 1 and Table 2 show the calculation results of LCD and OLED in white display, respectively. “Max” indicates the maximum value of each chromaticity xy in Examples 1, 2, and 3, and “Min” indicates the minimum value of each chromaticity xy in Examples 1, 2, and 3. “Δ” indicates a difference between “Max” and “Min”. “Δ” means a variation in measurement of chromaticity caused by the positional relationship between the two-dimensional color measurement device and the DUT. In the case of an LCD, the chromaticity x value is 0.3157 in Example 1, 0.3189 in Example 2, and 0.3216 in Example 3. Therefore, “Max” is 0.3216, “Min” is 0.3157, and “Δ” is 0.0059. The y value of chromaticity is 0.3155 in Example 1, 0.3090 in Example 2, and 0.3185 in Example 3. Therefore, Δ is 0.095. Further, in the case of an OLED having a color reproduction range wider than that of an LCD, the chromaticity x value Δ is 0.0071, and the y value Δ is 0.0106, which is larger than that of the LCD. In recent years, the display has a wide color gamut, and the measurement variation due to the positional relationship between the two-dimensional colorimetric device and the DUT has expanded. On the other hand, when the chromaticity of a light source or the like that does not have an RGB matrix type structure is measured with a colorimeter, the measurement accuracy of the chromaticity of the colorimeter is ± 0.0015, and the two-dimensional colorimeter and the DUT There is a problem that the measurement variation due to the positional relationship becomes larger.

The chromaticity measurement variation Δ shown in Tables 1 and 2 is the case where the number of each Sub-Pixel 11 in the photometric area is 22 to 23, respectively, and the photometric area is increased (that is, the second in the photometric area is the second). The number of pixels 13 is increased), and the chromaticity measurement variation Δ is reduced. FIG. 26 is a graph showing the relationship between chromaticity measurement variation and the number of second pixels 13 in the photometric area. The horizontal axis indicates the number of second pixels 13 in the photometric area, and the vertical axis indicates the measurement variation of chromaticity x and chromaticity y.

For example, when the number of the second pixels 13 in the photometry area is 5000, 70.7 (= √5000). For this reason, the number of sub-pixels in the photometric area is 70 to 71, respectively, so that the chromaticity measurement variation according to the set position of the photometric area can be reduced.

On the other hand, if the photometry area is excessively widened, the chromaticity and luminance are spatially averaged, so that the evaluation of the spatial luminance, chromaticity Mura, and uniformity of the DUT becomes insufficient. For example, the DUT has a resolution of 1920 * 1080 (the number of second pixels 13 is 2073600), and the number of first pixels 31 constituting the photometric area is 5000.

2073600/5000 = 414

Therefore, the measurement resolution in the horizontal and vertical directions is 20 * 20 (= √414).

As described above, when the photometric quantity is obtained using a predetermined measurement area, as shown in FIG. 23, the number of red Sub-Pixels 11-r, the green Sub-Pixel 11-r in the photometric area 33-2. There may be a difference between the number of g and the number of blue Sub-Pixels 11-b. As a result, even if the area of the photometric area 33-2 is the same, the chromaticity and the luminance are different if the set position of the photometric area 33-2 is different (Tables 1 and 2). That is, large measurement variations occur in chromaticity and luminance. In the two-dimensional colorimetric apparatus, since the number of points for measuring the luminance and chromaticity on the DUT is large (for example, 980 * 980), the number of the second pixels 13 in the photometric area is small. For example, the resolution of the DUT is 1920 * 1080, and the number of points to be measured is 980 * 980. The number of second pixels 13 in the photometric area is 2.16 (= 1920 * 1080 / (980 * 980)). Therefore, the number of sub-pixels 11 in the photometric area is 2 to 3, respectively, and there is a problem that large measurement variations occur as can be seen from FIG.

JP-A-6-2014472

An object of the present invention is to provide a two-dimensional color measurement device and a two-dimensional color measurement method capable of improving the measurement accuracy of the photometric quantity without excessively increasing the photometric area.

In order to achieve the above-described object, a two-dimensional colorimetric apparatus reflecting one aspect of the present invention is a two-dimensional colorimetric apparatus that measures a plurality of measurement regions in a color display screen, and includes a two-dimensional imaging unit. And a determination unit. The two-dimensional imaging unit includes first pixels arranged two-dimensionally and captures a color image displayed on the color display screen. The determination unit sets a plurality of photometric areas including two or more first pixels in correspondence with the plurality of measurement areas, and measures the light quantity of the plurality of measurement areas corresponding to each of the plurality of photometry areas. To decide. The determination unit provides a plurality of setting positions of the photometry area corresponding to the measurement area, and determines the photometry quantity of the measurement area based on the photometry quantity of the measurement area obtained at each of the setting positions. The first process is executed for each of the plurality of measurement regions.

The advantages and features afforded by one or more embodiments of the invention will be more fully understood from the detailed description and accompanying drawings provided below. The detailed description and the accompanying drawings are given by way of example only and are not intended as a definition of the limitations of the invention.

It is explanatory drawing explaining the photometry area | region arrange | positioned in the 1st setting position about the two-dimensional colorimetric apparatus which concerns on embodiment. It is explanatory drawing explaining the photometry area | region arrange | positioned in the 2nd setting position about the two-dimensional colorimetric apparatus which concerns on embodiment. It is explanatory drawing explaining the photometry area | region arrange | positioned in the 3rd setting position about the two-dimensional colorimetric apparatus which concerns on embodiment. It is explanatory drawing explaining the photometry area | region arrange | positioned in the 4th setting position about the two-dimensional colorimetric apparatus which concerns on embodiment. It is explanatory drawing explaining the photometry area | region arrange | positioned in the 5th setting position about the two-dimensional colorimetric apparatus which concerns on embodiment. It is explanatory drawing explaining the photometry area | region of the comparative example 2. FIG. It is a figure which shows the relationship between the color display (DUT) used as a to-be-measured object, and a two-dimensional colorimetry apparatus. It is a schematic diagram of the plane of a DUT screen. It is a block diagram which shows the structure of the two-dimensional colorimetric apparatus which concerns on embodiment. It is a schematic diagram which shows an example of an optical filter. It is a schematic diagram which shows the type 1 of the 2nd pixel which comprises a DUT screen. It is a schematic diagram which shows the type 2 of the 2nd pixel which comprises a DUT screen. It is a top view of a part of DUT screen. It is a top view of a part of a two-dimensional image sensor. It is a top view which shows the relationship between the photometry area | region arrange | positioned in the 1st setting position, a DUT screen, and a two-dimensional image sensor. It is a top view which shows the relationship between the photometry area | region arrange | positioned in the 2nd setting position, a DUT screen, and a two-dimensional image sensor. It is a top view which shows the relationship between the photometry area | region arrange | positioned in the 3rd setting position, a DUT screen, and a two-dimensional image sensor. It is a top view which shows the relationship between the photometry area | region arrange | positioned in the 4th setting position, a DUT screen, and a two-dimensional image sensor. It is a top view which shows the relationship between the photometry area | region arrange | positioned in the 5th setting position, a DUT screen, and a two-dimensional image sensor. It is a flowchart explaining the measurement of the photometric quantity using the two-dimensional colorimetric apparatus which concerns on embodiment. It is a top view of an example of a two-dimensional image sensor. It is a top view of an example of a DUT screen. FIG. 20 is a plan view showing a state in which the DUT screen shown in FIG. 20 is imaged on the two-dimensional imaging device shown in FIG. 19. It is the enlarged view to which a part of FIG. 21 was expanded. It is explanatory drawing explaining the relationship between the setting position of a photometry area | region, and the number of Sub-Pixels of each color in a photometry area | region. It is a graph which shows the spectral radiance of LCD. It is a graph which shows the spectral radiance of OLED. It is a graph which shows the relationship between the measurement variation of chromaticity, and the number of the 2nd pixels in a photometry area | region.

Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments.

Before describing the embodiment, the measurement area and the photometry area will be described. FIG. 7 is a diagram illustrating the relationship between the DUT and the two-dimensional colorimetric apparatus 300 as described above. FIG. 19 is a plan view of an example of the two-dimensional imaging device 3 built in the two-dimensional colorimetric apparatus 300 of FIG. In the two-dimensional image sensor 3, the first pixels 31 are arranged in a matrix. In this example, the number of pixels in the horizontal direction is 20, and the number of pixels in the vertical direction is 20. Actually, the number of pixels in the horizontal direction and the vertical direction is larger, for example, the number of pixels in the horizontal direction is 1600 and the number of pixels in the vertical direction is 1200.

FIG. 20 is a plan view of an example of the DUT screen 1 provided in the DUT of FIG. In FIG. 19 and FIG. 20, the two-dimensional imaging device 3 and the DUT screen 1 are drawn to substantially the same size, but the actual sizes of both are greatly different. For example, when the DUT screen 1 is a 55-inch television, the horizontal display size is 1217 mm, and the vertical display size is 684 mm. When the two-dimensional imaging device 3 is a 1-inch CCD, the horizontal imaging size is 22 mm, and the vertical imaging size is 12 mm. FIG. 20 shows a DUT screen 1 having a structure in which the same colors are arranged in the vertical direction. Sub-Pixels 11 constituting the second pixel 13 are represented by red Sub-Pixel 11-r, green Sub-Pixel 11-g, and blue Sub-Pixel 11 -B. The second pixel 13 includes three second pixels 13 in order to show a state where the second pixel 13 is repeatedly arranged in the horizontal direction (horizontal direction).

FIG. 21 is a plan view showing a state in which the DUT screen 1 shown in FIG. 20 is imaged on the two-dimensional imaging device 3 shown in FIG. Since the two-dimensional colorimetric apparatus 300 needs to image the entire DUT screen 1, the two-dimensional image sensor 3 is normally set to be larger than the DUT screen 1. In this figure, the first pixel 31 of the two-dimensional image pickup device 3 is larger than the second pixel 13 of the DUT screen 1, but it may be reversed.

FIG. 22 is an enlarged view of a part of FIG. Referring to FIG. 22, the DUT screen 1 includes sub-pixels 11 in which sub-pixels 11 having the same color are arranged in the vertical direction and arranged in the order of RGB along the horizontal direction. The Sub-Pixel 11 includes a red Sub-Pixel 11-r, a green Sub-Pixel 11-g, and a blue Sub-Pixel 11-b. The Sub-Pixels 11 are repeatedly arranged in the order of red, green, and blue. One set of red Sub-Pixel 11-r, green Sub-Pixel 11-g, and blue Sub-Pixel 11-b constitutes one second pixel 13.

The measurement area is a position on the DUT screen 1 that the measurer wants to measure, and is determined by the coordinates of the second pixel 13 on the DUT screen 1. The photometric area is an area actually measured by the color measuring device. In the case of the two-dimensional colorimetric apparatus 300, the photometric area is determined by the coordinates of the first pixel 31.

In the case of the two-dimensional colorimetric apparatus 300, the photometric area is determined by the position of the first pixel 31 of the two-dimensional image sensor 3. For example, in the example shown in FIG. 22, the coordinates (501, 501) of the first pixel 31, the coordinates (504, 501) of the first pixel 31, the coordinates (501, 505) of the first pixel 31, and the first pixel An area defined by 31 coordinates (504, 505) is a photometric area 33-1. The number of first pixels 31 used for photometry (the number of first pixels 31 constituting the photometry area 33-1) is 20 (= 4 pixels in the horizontal direction * 5 pixels in the vertical direction).

In the case of the two-dimensional color measuring apparatus 300, referring to FIG. 22, in the horizontal direction, the number of red Sub-Pixels 11-r is 4, the number of green Sub-Pixels 11-g is 3, and the number of blue Sub-Pixels 11-b Becomes 3.6. Therefore, the number of the second pixels 13 in the photometric area 33-1 is 3.53 (= (4 + 3 + 3.6) / 3).

As can be seen from the above description, the number of the second pixels 13 in the photometric area is not an integer. In other words, the number of red sub-pixels 11-r, the number of green sub-pixels 11-g, and the number of blue sub-pixels 11-b are not equal. Such an event occurs because the positions of the measurement area and the photometry area do not match. This is because, in the case of the two-dimensional colorimetric apparatus 300, the size of the first pixel 31 of the two-dimensional image sensor 3 and the size of the second pixel 13 of the DUT screen 1 imaged on the two-dimensional image sensor 3 are different.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the characteristics of the two-dimensional colorimetric apparatus 300 according to the embodiment will be described in comparison with a comparative example. The two-dimensional colorimetric apparatus 300 according to the embodiment provides a plurality of setting positions of one photometric area corresponding to one measurement area, and based on the photometric quantity of the measurement area obtained at each setting position, The photometric quantity of the measurement area is determined. Specifically, the setting position of one photometry area set for one measurement area is shifted (for example, the first pixel 31 is shifted to one or two setting positions) and obtained at each setting position. Average the measured light intensity. This reduces the difference between the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, and the number of blue Sub-Pixels 11-b in the photometric area, and improves the measurement accuracy of chromaticity and luminance.

FIGS. 1 to 5 are explanatory diagrams for explaining the photometric area 33-3 arranged at the first setting position to the fifth setting position in the two-dimensional colorimetric apparatus 300 according to the embodiment. FIG. 1 is also a photometric area 33-3 of Comparative Example 1. The number of first pixels 31 constituting the photometric area 33-3 is 30 (= 5 pixels in the horizontal direction * 6 pixels in the vertical direction). FIG. 6 is an explanatory diagram for explaining the photometric area 33-4 of the second comparative example. The number of first pixels 31 constituting the photometric area 33-4 is 54 (= 9 pixels in the horizontal direction * 6 pixels in the vertical direction). In these drawings, the DUT screen 1 is imaged on the two-dimensional imaging device 3 (imaging surface), and a part of the two-dimensional imaging device 3 (part of the imaging surface) and a part of the DUT screen 1 are displayed. Shown in a plane. The structure of the two-dimensional image sensor 3 and the structure of the DUT screen 1 are the same as the structure of the two-dimensional image sensor 3 and the structure of the DUT screen 1 shown in FIGS. “501” to “512” indicate the coordinates (plane coordinates) of the first pixel 31. The first pixel 31 is a pixel of the two-dimensional image sensor 3. In FIG. 1, the set position of the photometric area 33-3 is a position defined by coordinates (504, 503), coordinates (508, 503), coordinates (504, 508) and coordinates (508, 508). This is set as a reference setting position (first setting position). In FIG. 2, the second setting position of the photometric area 33-3 is shifted to the right by one first pixel 31 from the first setting position. In FIG. 3, the third setting position of the photometric area 33-3 is shifted to the right by two first pixels 31 from the first setting position. In FIG. 4, the fourth setting position of the photometry area 33-3 is shifted to the left by one first pixel 31 from the first setting position. In FIG. 5, the fifth setting position of the photometric area 33-3 is shifted to the left by two first pixels 31 from the first setting position. Thus, in the embodiment, the photometric area 33-3 is wobbled. Here, wobbling means to move the set position of the photometry area 33-3 up, down, left and right with reference to the first set position.

Referring to FIG. 6, the photometric area 33-3 of Comparative Example 2 has a larger area than the photometric area 33-3 of the embodiment and Comparative Example 1. The set position of the photometric area 33-4 is a position defined by coordinates (502, 503), coordinates (510, 503), coordinates (502, 508), and coordinates (510, 508).

In Comparative Example 1 (FIG. 1), the measurement area designated by the measurer is set as the photometric area 33-3, the photometric quantity is calculated, and chromaticity and luminance are measured based on the photometric quantity. In this method, the photometric quantity is obtained from the photometric area 33-3 centered on the position of the measurement area shown in FIG. 1 designated by the measurer, so that the contribution of the photometric quantity at the designated position is high. The advantages of Comparative Example 1 are as follows. (1) The area of the measurement region is constant. (2) The center position of the measurement area is the position designated by the measurer. The disadvantages of Comparative Example 1 are as follows. As described with reference to FIG. 23, when the positional relationship between the two-dimensional imaging device 3 and the DUT screen 1 changes slightly (the setting position of the photometric region 33-3 changes slightly), the measurement result (chromaticity, luminance) A relatively large measurement variation occurs.

The photometric area 33-3 of Comparative Example 2 (FIG. 6) has a larger area than the photometric area 33-3 of Comparative Example 1 (FIG. 1). As described with reference to FIG. 26, the comparative example 2 can reduce the measurement variation generated in the measurement results (chromaticity and luminance) as compared with the comparative example 1, but the evaluation of the spatial luminance and the like of the DUT is insufficient. Become.

Disadvantages of the embodiment (FIGS. 1 to 5) are as follows. (1) Although the center position of the measurement area is specified by the measurer, since the photometry area 33-3 is wobbling, the center position is slightly shifted. (2) The area of the photometry region 33-3 is larger than the area of the measurement region designated by the measurer. The advantages of the embodiment are as follows. (1) Even if the positional relationship between the two-dimensional imaging device 3 and the DUT screen 1 changes slightly (the setting position of the photometric area 33-3 changes slightly), measurement variations that occur in the measurement results (chromaticity, luminance) Is relatively small. (2) In Comparative Example 2 (FIG. 6), since the area of the photometric region 33-4 is increased, the area of the measurement region is increased, and the influence of the center position of the measurement region on the measurement result is reduced (measurer Want to know the chromaticity and brightness at the center of the measurement area). Since the area of the photometric area 33-3 of the embodiment can be made smaller than that of the photometric area 33-4 of Comparative Example 2, the influence of the center position of the measurement area on the measurement result can be increased.

Regarding the difference in the number of red sub-pixels 11-r, the number of green sub-pixels 11-g, and the number of blue sub-pixels 11-b in the photometry area 33, the embodiment (FIGS. 1 to 5) and the comparative example 1 ( FIG. 1) is compared with Comparative Example 2 (FIG. 6). Table 3 is a table regarding the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, and the number of blue Sub-Pixels 11-b in the photometry area 33-3 for the embodiment.

Table 3 will be described with an example where Wobbling is -2. Referring to FIG. 5, the number of red sub-pixels 11-r in the photometry area 33-3 is 3.4, and the number of green sub-pixels 11-g in the photometry area 33-3 is 3.2. And the number of blue Sub-Pixels 11-b in the photometric area 33-3 is four. The sum of these is 10.6.

1 to 5, the average value of the number of red Sub-Pixels 11-r in the photometric area 33-3 is 3.48, and the average number of green Sub-Pixels 11-g in the photometric area 33-3 The value is 3.50, the average value of the number of blue Sub-Pixels 11-b in the photometry area 33-3 is 3.62, and the total average value is 10.6.

Table 4 is a table regarding the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, and the number of blue Sub-Pixels 11-b in the photometry area 33 for Comparative Example 1, Comparative Example 2, and the embodiment. is there.

For Comparative Example 1 (FIG. 1), the number of red Sub-Pixels 11-r in the photometric area 33-3 is 3.7, and the number of green Sub-Pixels 11-g in the photometric area 33-3 is 3 .9, and the number of blue sub-pixels 11-b in the photometric area 33-3 is 3.0. For Comparative Example 2 (FIG. 6), the number of red Sub-Pixels 11-r in the photometric area 33-4 is 6.1, and the number of green Sub-Pixels 11-g in the photometric area 33-4 is 6 .3, and the number of blue Sub-Pixels 11-b in the photometric area 33-4 is 7.0. For the embodiment (FIGS. 1 to 5), the average value of the number of red Sub-Pixels 11-r in the photometric area 33-3 is 3.48, and the green Sub-Pixel 11-g in the photometric area 33-3 The average value of the number of blue sub-pixels 11-b in the photometry area 33-3 is 3.50.

The difference is a value represented by the following formula.

Difference = {(maximum / minimum) -1} * 100

In the case of Comparative Example 1, the difference is 30% (= {(3.9 / 3.0) -1} * 100). In the case of Comparative Example 2, the difference is 15% (≈ {(7.0 / 6.1) -1} * 100). In the case of the embodiment (average shown in Table 3), the difference is 4% (≈ {(3.62 / 3.48) -1} * 100). As described above, according to the embodiment, compared to Comparative Example 1 and Comparative Example 2, the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, and the blue Sub-Pixels 11-b in the photometry area 33 are compared. Therefore, the measurement accuracy of chromaticity and luminance can be improved. In addition, according to the embodiment, the photometry area 33-3 is wobbled around the center position designated by the measurer (FIG. 1) (FIGS. 2 to 5), so that the center position of the measurement area is the measurement result. The effect it has can be increased.

Referring to FIG. 7, a color image (for example, a white image) is displayed on DUT screen 1. The measurement object of the two-dimensional color measuring device 300 is the DUT screen 1 (two-dimensional region). The two-dimensional colorimetric apparatus 300 sets a plurality of measurement areas on the DUT screen 1 based on an instruction from the measurer, and performs colorimetry on the plurality of measurement areas simultaneously. FIG. 8 is a schematic diagram of a plane of the DUT screen 1. Here, for example, 25 measurement areas 15 are set on the DUT screen 1.

FIG. 9A is a block diagram showing a configuration of the two-dimensional colorimetric apparatus 300. The two-dimensional colorimetric apparatus 300 includes an optical lens 301, an optical filter 302, a two-dimensional imaging device 3, a signal processing unit 303, an A / D conversion unit 304, an arithmetic processing unit 305, a communication unit 306, Is provided. The optical lens 301 converges the light L from the entire DUT screen 1. The light L converged by the optical lens 301 is received by the two-dimensional image sensor 3 through the optical filter 302.

The two-dimensional imaging device 3 is, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary MOS), and is an optical sensor having a two-dimensional region as a measurement range. The two-dimensional imaging device 3 receives the light L through the optical filter 302 to capture a color image displayed on the entire DUT screen 1 and an electrical signal (color image information) indicating information of the captured color image. Signal SG).

The optical filter 302 will be described with reference to FIG. 9B. FIG. 9B is a schematic diagram illustrating an example of the optical filter 302. The optical filter 302 includes an X filter 302a that transmits the X component, a Y filter 302b that transmits the Y component, a Z filter 302c that transmits the Z component, and a disc-shaped holder 302d that holds these filters. It is. The X filter 302a is set so that the combined spectral sensitivity of the spectral response of the first pixel 31 and the X filter 302a becomes x (λ) defined by CIE1931. The Y filter 302b is set so that the combined spectral sensitivity of the spectral response of the first pixel 31 and the Y filter 302b becomes y (λ) defined by CIE1931. The Z filter 302c is set so that the combined spectral sensitivity of the spectral response of the first pixel 31 and the Z filter 302c becomes z (λ) defined by CIE1931. The holder 302d is rotated by a rotation mechanism (not shown), and the positions of the X filter 302a, the Y filter 302b, and the Z filter 302c can be sequentially switched to positions facing the two-dimensional imaging device 3. The two-dimensional imaging device 3 receives light L that has passed through a filter located at a position facing the two-dimensional imaging device 3.

The optical filter 302 and the two-dimensional imaging element 3 constitute a two-dimensional imaging unit 310. The two-dimensional imaging unit 310 has a structure in which the first pixels 31 are two-dimensionally arranged, and images a color image displayed on the DUT screen 1 (an example of a color display screen).

The signal processing unit 303 is a circuit that performs known signal processing on the color image information signal SG output from the two-dimensional image sensor 3. For example, when the two-dimensional imaging device 3 is a CCD, the signal processing unit 303 includes a CDS (Correlated Double Sampling), and the CDS removes reset noise from the color image information signal SG.

The A / D conversion unit 304 is a circuit that converts the color image information signal SG subjected to signal processing by the signal processing unit 303 from analog to digital.

The calculation processing unit 305 executes various settings and calculations necessary for measuring chromaticity and luminance. The arithmetic processing unit 305 is a microcomputer implemented by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The CPU is an example of a hardware processor. The arithmetic processing unit 305 includes a storage unit 307, a determination unit 308, a first calculation unit 309, and a second calculation unit 310 as functional blocks. These will be described later.

Note that some or all of the functions of the arithmetic processing unit 305 may be realized by processing by a DSP (Digital Signal Processor) instead of or by processing by the CPU. Similarly, some or all of the functions of the arithmetic processing unit 305 may be realized by processing by a dedicated hardware circuit in place of, or together with, processing by software.

The communication unit 306 is a communication interface (communication interface circuit) that communicates with a PC (Personal Computer) 400 outside the two-dimensional colorimetric apparatus 300. The measurer operates the PC 400 to make various settings necessary for colorimetry on the DUT screen 1 to the two-dimensional colorimetric apparatus 300 (for example, designation of the center position of the measurement region 15 and the number of measurement regions 15). Instructs to execute color measurement.

There are various types of second pixels 13 constituting the DUT screen 1. Here, two types will be described. FIG. 10A is a schematic diagram showing type 1 of the second pixel 13 constituting the DUT screen 1. FIG. 10B is a schematic diagram showing type 2 of the second pixel 13 constituting the DUT screen 1. Referring to FIG. 10A, type 1 of the second pixel 13 includes one red Sub-Pixel 11-r, one green Sub-Pixel 11-g, and one blue Sub-Pixel 11-b. Referring to FIG. 10B, type 2 of the second pixel 13 includes one red Sub-Pixel 11-r, two green Sub-Pixels 11-g, and one blue Sub-Pixel 11-b.

Measurement of the photometric quantity using the two-dimensional colorimetric apparatus 300 according to the embodiment will be described. FIG. 18 is a flowchart for explaining this. In the DUT screen 1, a plurality of measurement areas 15 (for example, 25 measurement areas 15 shown in FIG. 8) are set. Referring to FIG. 9A, the determination unit 308 sets a plurality of photometry areas 33 corresponding to the plurality of measurement areas 15 (if another expression is used, the plurality of photometry areas 33 are assigned to the plurality of measurement areas 15 by one. In other words, a plurality of photometric areas 33 are displayed on a color image (color image displayed on the DUT screen 1) captured by the two-dimensional image sensor 3. Are determined in correspondence with the plurality of measurement areas 15), and the light measurement amounts of the plurality of measurement areas 15 corresponding to the plurality of photometry areas 33 are determined. Since the determination method of the photometric quantity in these measurement areas 15 is the same, a description will be given by taking one measurement area 15 as an example. FIG. 11 is a plan view of a part of the DUT screen 1. The second pixel 13 is the type 1 described above. Each second pixel 13 constituting the DUT screen 1 is specified by xy plane coordinates. The x-coordinate and y-coordinate are 301 to 309, respectively.

Referring to FIG. 9A and FIG. 11, the measurer operates the PC 400 to input the coordinates serving as the center of the measurement region 15 and the size of the measurement region 15. Here, it is assumed that (305, 305) is input as coordinates and 3 * 3 is input as size. 3 * 3 means that the number of the second pixels 13 in the xy direction is 3, respectively.

The PC 400 transmits the input coordinates and size to the two-dimensional colorimetric apparatus 300, and the determination unit 308 determines the second pixel 13 located at the input coordinates (305, 305) and the second pixel 13. Eight second pixels 13 positioned around are set as the measurement region 15 (step S1 in FIG. 18). The set position of the measurement region 15 is a position defined by coordinates (304, 304), coordinates (306, 304), coordinates (304, 306), and coordinates (306, 306). The number of second pixels 13 constituting the measurement region 15 is nine. The number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, and the number of blue Sub-Pixels 11-b in the measurement region 15 are equal. In this example, both numbers are nine.

Next, the determination unit 308 sets a photometric area 33-5 (FIG. 12) corresponding to the measurement area 15 shown in FIG. 11 (step S2 in FIG. 18). FIG. 12 is a plan view of a part of the two-dimensional image sensor 3. Each first pixel 31 constituting the two-dimensional imaging device 3 (imaging surface) is specified by xy plane coordinates. The x coordinate indicates 501 to 516, and the y coordinate indicates 501 to 515. The determination unit 308 is the closest to the coordinates (304, 304) of the DUT screen 1 and the position on the xy coordinates in a state where the DUT screen 1 shown in FIG. 11 is imaged on the two-dimensional imaging device 3 shown in FIG. The coordinates on the two-dimensional image sensor 3 are obtained. Here, it is assumed that coordinates (507, 506) are obtained. Similarly, the determination unit 308 obtains coordinates on the two-dimensional image sensor 3 for the coordinates (306, 304), the coordinates (304, 306), and the coordinates (306, 306). Here, it is assumed that coordinates (510, 506), coordinates (507, 509), and coordinates (510, 509) are obtained.

The determination unit 308 sets the photometric area 33-5. The set position of the photometric area 33-5 is a position defined by coordinates (507, 506), coordinates (510, 506), coordinates (507, 509), and coordinates (510, 509). This is the first set position. The number of first pixels 31 constituting the photometric area 33-5 is 16. Note that the number of the first pixels 31 constituting the photometric area 33-5 is not limited to 16, but may be two or more. Since the size of the first pixel 31 and the size of the second pixel 13 are different, the size of the measurement region 15 (FIG. 11) and the size of the photometry region 33-5 (FIG. 12) do not match. In addition to the first setting position, the setting positions include a second setting position to a fifth setting position, which will be described later (FIGS. 14 to 17). Of these five setting positions, the first setting position is the setting position where the overlap between the measurement region 15 and the photometry region 33-5 is the largest. The remaining set positions are set positions where the first pixel 31 is shifted by one from the first set position.

FIG. 13 is a plan view showing the relationship among the photometry area 33-5, the DUT screen 1, and the two-dimensional image sensor 3 arranged at the first set position. The DUT screen 1 is the DUT screen 1 shown in FIG. The two-dimensional image sensor 3 is the two-dimensional image sensor 3 shown in FIG. FIG. 13 shows a state in which the DUT screen 1 is imaged on the two-dimensional image sensor 3. The same applies to FIGS. 14 to 17 below.

In the photometric area 33-5 at the first setting position, the number of red Sub-Pixels 11-r is 6.0, the number of green Sub-Pixels 11-g is 6.6, and the blue Sub-Pixels 11-b Is 4.7. These numbers are included in the photometric area 33-5 at the first set position shown in FIG. 13 for the purpose of understanding the contents of the embodiment (in other words, to explain that these numbers differ for each set position). Only the specific value of the number of each Sub-Pixel 11 located in is shown. The two-dimensional color measuring device 300 does not calculate these numbers. The same applies to the number of sub-pixels 11 at each setting position described below.

Referring to FIG. 9A, the two-dimensional colorimetric apparatus 300 captures a white image displayed on the DUT screen 1 in a state where the X filter 302a (FIG. 9B) faces the two-dimensional image sensor 3, and the white image is displayed. It memorize | stores in the memory | storage part 307 (step S3 of FIG. 18). Since the two-dimensional image sensor 3 faces the X filter 302a, it receives the light that has passed through the X filter 302a. Similarly, the two-dimensional colorimetric apparatus 300 captures a white image displayed on the DUT screen 1 with the Y filter 302 b (FIG. 9B) facing the two-dimensional image sensor 3 and stores the white image in the storage unit 307. The white image displayed on the DUT screen 1 is captured in a state where the Z filter 302c (FIG. 9B) faces the two-dimensional image sensor 3, and the white image is stored in the storage unit 307. The determination unit 308 performs a first process for determining a photometric amount for each of these white images. Since the manner of the first processing is the same, a description will be given by taking a white image taken as an example in a state where the X filter 302a and the two-dimensional imaging device 3 face each other.

The determination unit 308 reads a white image (a white image captured in a state where the X filter 302a and the two-dimensional image sensor 3 face each other) stored in the storage unit 307, and sets the position of the photometric area 33-5 Are set to the first setting position to the fifth setting position, and the photometric amount of the measurement region 15 (FIG. 11) is obtained at each setting position. More specifically, the determination unit 308 uses the value of the color image information signal SG output from the Sub-Pixel 11 in the photometric area 33-5 (FIG. 13) at the first setting position to determine the photometric amount of the measurement area 15. Calculation is performed (step S4 in FIG. 18).

Next, the determination unit 308 changes the setting position of the photometry area 33-5 to the second setting position. FIG. 14 is a plan view showing the relationship among the photometric region 33-5, the DUT screen 1, and the two-dimensional imaging device 3 arranged at the second setting position (one pixel wobbling to the right with respect to the first setting position). FIG. The second set position is a position defined by coordinates (508, 506), coordinates (511, 506), coordinates (508, 509), and coordinates (511, 509). The second setting position is a position where the first pixel 31 is shifted by 1 in the x direction from the first setting position (FIG. 13).

In the photometry area 33-5 at the second setting position, the number of red Sub-Pixels 11-r is 8.7, the number of green Sub-Pixels 11-g is 7.0, and the blue Sub-Pixels 11-b Is 5.1. As described above, the two-dimensional colorimetric apparatus 300 does not calculate these numbers.

The determination unit 308 calculates the photometric amount of the measurement region 15 using the value of the color image information signal SG output from the Sub-Pixel 11 in the photometry region 33-5 (FIG. 14) at the second set position (FIG. 14). 18 step S5).

Next, the determination unit 308 changes the setting position of the photometry area 33-5 to the third setting position. FIG. 15 is a plan view showing the relationship between the photometric area 33-5, the DUT screen 1, and the two-dimensional image sensor 3 arranged at the third setting position (one pixel wobbling to the left with respect to the first setting position). FIG. The third set position is a position defined by coordinates (506, 506), coordinates (509, 506), coordinates (506, 509), and coordinates (509, 509). The third set position is a position where the first pixel 31 is shifted by minus 1 in the x direction from the first set position (FIG. 13).

In the photometric area 33-5 at the third setting position, the number of red Sub-Pixels 11-r is 6.0, the number of green Sub-Pixels 11-g is 8.0, and the blue Sub-Pixels 11-b Is 4.6.

The determination unit 308 calculates the photometric amount of the measurement region 15 using the value of the color image information signal SG output from the Sub-Pixel 11 in the photometry region 33-5 (FIG. 15) at the third setting position (FIG. 15). 18 step S6).

Next, the determination unit 308 changes the setting position of the photometry area 33-5 to the fourth setting position. FIG. 16 is a plan view showing the relationship among the photometric area 33-5, the DUT screen 1, and the two-dimensional image sensor 3 arranged at the fourth setting position (one pixel wobbling above the first setting position). FIG. The fourth set position is a position defined by coordinates (507, 505), coordinates (510, 505), coordinates (507, 508), and coordinates (510, 508). The fourth setting position is a position where the first pixel 31 is shifted by minus 1 in the y direction from the first setting position (FIG. 13).

In the photometry area 33-5 at the fourth setting position, the number of red Sub-Pixels 11-r is 4.0, the number of green Sub-Pixels 11-g is 4.4, and the blue Sub-Pixels 11-b Is 7.5.

The determination unit 308 calculates the photometric amount of the measurement region 15 using the value of the color image information signal SG output from the Sub-Pixel 11 in the photometric region 33-5 (FIG. 16) at the fourth setting position (FIG. 16). 18 step S7).

Next, the determination unit 308 changes the setting position of the photometry area 33-5 to the fifth setting position. FIG. 17 is a plan view showing the relationship among the photometric region 33-5, the DUT screen 1, and the two-dimensional image sensor 3 arranged at the fifth setting position (one pixel wobbling below the first setting position). FIG. The fifth set position is a position defined by coordinates (507, 507), coordinates (510, 507), coordinates (507, 510), and coordinates (510, 510). The fifth setting position is a position where the first pixel 31 is shifted by 1 in the y direction from the first setting position (FIG. 13).

In the photometry area 33-5 at the fifth setting position, the number of red Sub-Pixels 11-r is 4.8, the number of green Sub-Pixels 11-g is 5.3, and the blue Sub-Pixels 11-b The number of is 6.9.

The determination unit 308 calculates the photometric amount of the measurement region 15 using the value of the color image information signal SG output from the Sub-Pixel 11 in the photometry region 33-5 (FIG. 17) at the fifth setting position (FIG. 17). 18 step S8).

The determination unit 308 calculates the light metering amount of the measurement region 15 (step S4) in which the photometry region 33-5 is calculated at the first set position (FIG. 13), and the photometry region 33-5 is calculated in the second set position (FIG. 14). The measured light amount of the measurement area 15 (step S5), the photometric area 33-5 is calculated at the third set position (FIG. 15) (step S6), and the photometric area 33-5 is the fourth. The photometric amount of the measurement region 15 calculated at the set position (FIG. 16) (step S7) and the photometric amount of the measurement region 15 calculated at the fifth set position (FIG. 17) (step S8). ) Is determined, and this average value is determined as the photometric quantity in the measurement region 15 (FIG. 11) (step S9). The determination unit 308 performs steps S4 to S9 for each of the plurality of measurement regions 15 in the DUT screen 1. As described above, the determination unit 308 provides a plurality of setting positions (here, five setting positions) of the photometry area 33-5 corresponding to the measurement area 15, and the photometric quantity of the measurement area 15 obtained at each setting position. Based on the above, the first process for determining the photometric amount of the measurement region 15 is executed for each of the plurality of measurement regions 15. In addition, although five setting positions were demonstrated to the example, the number of setting positions may be larger than this.

As described above, the photometric amount of the measurement region 15 for the captured white image is determined in a state where the X filter 302a and the two-dimensional imaging device 3 face each other. The two-dimensional colorimetric device 300 is a white image captured with the Y filter 302b and the two-dimensional image sensor 3 facing each other, and a white image captured with the Z filter 302c and the two-dimensional image sensor 3 facing each other. Similarly, for the image, the photometric amount of the measurement region 15 is determined. Referring to FIG. 9A, the first calculation unit 309 calculates chromaticity (colorimetric values) for each of the plurality of measurement regions 15 based on these photometric amounts. The second calculation unit 310 calculates the luminance for each of the plurality of measurement regions 15 based on these photometric amounts.

The main effects of the embodiment will be described. Referring to FIG. 9A and FIG. 18, the determination unit 308 provides a plurality of setting positions of the photometry area 33-5 corresponding to the measurement area 15 (FIG. 11) (FIGS. 13 to 17), and obtains at each setting position. Based on the measured light amount of the measurement area 15 (steps S4 to S8), a first process for determining the light amount of the measurement area 15 is performed (step S9). The determination unit 308 executes the first process for each of the plurality of measurement regions 15 in the DUT screen 1. Therefore, the photometric quantity can be averaged for each of the plurality of measurement areas 15 (the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, the blue Sub-Pixels 11-b in the photometric area 33-5). Can reduce the difference in number). As described above, according to the two-dimensional colorimetric apparatus 300 according to the embodiment, since the photometric amounts can be averaged for each of the plurality of measurement regions 15, even in the DUT screen 1 (an example of a color display screen) The measurement accuracy of the photometric quantity can be improved without excessively increasing the photometric area 33-5.

The determination unit 308 reads the white image stored in the storage unit 307 in step S3 from the storage unit 307, and uses the white image (for each of the plurality of measurement regions 15 captured in the white image). The first process is executed (steps S4 to S9). As described above, according to the embodiment, it is not necessary to capture the white image displayed on the DUT screen 1 every time the setting position of the photometric area 33-5 is changed, so that the DUT screen 1 can be measured at high speed. Can do.

The areas of the photometric areas 33-5 (FIGS. 13 to 17) set in the first to fifth setting positions are the same as each other. As described above, according to the embodiment, the area of the photometric region 33-5 is not changed according to the set position, so that the processes in steps S4 to S9 can be simplified.

Although a white image has been described as an example of a color image displayed on the DUT screen 1, it is not limited to this. The color image displayed on the DUT screen 1 may be a color image other than the primary color. For example, complementary colors such as cyan and magenta and intermediate colors may be used. In the case of a primary color image, even if the number of sub-pixels 11 is different, the chromaticity is the same, and therefore there is no measurement variation reducing effect according to this embodiment.

Although the sub-pixels 11 constituting the second pixel 13 have been described by taking three examples of red sub-pixels 11-r, green sub-pixels 11-g, and blue sub-pixels 11-b as examples, the present invention is not limited thereto. For example, the embodiment can be applied to the case where the Sub-Pixel 11 configuring the second pixel 13 is four cases of red Sub-Pixel, green Sub-Pixel, blue Sub-Pixel, and white Sub-Pixel. The embodiment can also be applied to the four cases of Sub-Pixel, Green Sub-Pixel, Blue Sub-Pixel, and Yellow Sub-Pixel.

The determination of the photometric quantity in the measurement area 15 (FIG. 11) has been described with reference to the first setting position (FIG. 13) to the fifth setting position (FIG. 17) as the setting position of the photometry area 33-5. The position is not limited to these. As the setting positions of the photometry area 33-5, for example, there are a sixth setting position to a thirteenth setting position.

The sixth setting position (two pixels wobbling to the right with respect to the first setting position) is a position where the first pixel 31 is shifted by +2 in the x direction from the first setting position shown in FIG. The sixth set position is a position defined by coordinates (509, 506), coordinates (512, 506), coordinates (509, 509), and coordinates (512, 509). In the photometric area 33-5 at the sixth setting position, the number of red Sub-Pixels 11-r is 6.0, the number of green Sub-Pixels 11-g is 7.8, and the blue Sub-Pixels 11-b Is 5.0. As described above, the two-dimensional colorimetric apparatus 300 does not calculate these numbers. The same applies hereinafter.

The seventh setting position (two pixels wobbling on the left with respect to the first setting position) is a position where the first pixel 31 is shifted by minus 2 in the x direction from the first setting position shown in FIG. The seventh set position is a position defined by coordinates (505, 506), coordinates (508, 506), coordinates (505, 509), and coordinates (508, 509). In the photometry area 33-5 at the seventh setting position, the number of red Sub-Pixels 11-r is 8.0, the number of green Sub-Pixels 11-g is 6.0, and the blue Sub-Pixels 11-b Is 4.7.

The eighth setting position (upper two pixels wobbling with respect to the first setting position) is a position where the first pixel 31 is shifted by minus 2 in the y direction from the first setting position shown in FIG. The eighth set position is a position defined by coordinates (507, 504), coordinates (510, 504), coordinates (507, 507), and coordinates (510, 507). In the photometry area 33-5 at the eighth setting position, the number of red Sub-Pixels 11-r is 5.6, the number of green Sub-Pixels 11-g is 6.3, and the blue Sub-Pixel 11-b The number of is 6.0.

The ninth setting position (2 pixels wobbling below the first setting position) is a position where the first pixel 31 is shifted by +2 in the y direction from the first setting position shown in FIG. The ninth set position is a position defined by coordinates (507, 508), coordinates (510, 508), coordinates (507, 511), and coordinates (510, 511). In the photometry area 33-5 at the ninth setting position, the number of red Sub-Pixels 11-r is 6.0, the number of green Sub-Pixels 11-g is 6.8, and the blue Sub-Pixels 11-b The number of is 7.4.

The tenth setting position (one pixel on the right and one pixel wobbling on the first setting position) is the first pixel 31 in the x direction plus the first pixel 31 in the x direction from the first setting position shown in FIG. One pixel 31 is shifted by minus one. The tenth set position is a position defined by coordinates (508, 505), coordinates (511, 505), coordinates (508, 508), and coordinates (511, 508). In the photometric area 33-5 at the tenth setting position, the number of red Sub-Pixels 11-r is 5.5, the number of green Sub-Pixels 11-g is 4.7, and the blue Sub-Pixels 11-b The number of is 6.8.

The eleventh set position (one pixel on the left and one pixel on the top with respect to the first set position) is the first pixel 31 in the x direction from the first set position shown in FIG. One pixel 31 is shifted by minus one. The tenth set position is a position defined by coordinates (506, 505), coordinates (509, 505), coordinates (506, 508), and coordinates (509, 508). In the photometry area 33-5 at the eleventh set position, the number of red Sub-Pixels 11-r is 4.0, the number of green Sub-Pixels 11-g is 5.3, and the blue Sub-Pixels 11-b The number of is 6.8.

The twelfth set position (one pixel to the right and one pixel wobbling to the first set position) is the first pixel 31 in the x direction plus the first pixel in the y direction from the first set position shown in FIG. One pixel 31 is a position shifted by plus one. The twelfth set position is a position defined by coordinates (508, 507), coordinates (511, 507), coordinates (508, 510), and coordinates (511, 510). In the photometry area 33-5 at the twelfth set position, the number of red Sub-Pixels 11-r is 6.6, the number of green Sub-Pixels 11-g is 5.5, and the blue Sub-Pixels 11-b The number of is 6.0.

The thirteenth set position (one pixel on the left and one pixel on the bottom with respect to the first set position) is the first pixel 31 in the x direction from the first set position shown in FIG. One pixel 31 is a position shifted by plus one. The thirteenth set position is a position defined by coordinates (506, 507), coordinates (510, 507), coordinates (506, 510), and coordinates (510, 510). In the photometry area 33-5 at the thirteenth set position, the number of red Sub-Pixels 11-r is 4.8, the number of green Sub-Pixels 11-g is 6.5, and the blue Sub-Pixels 11-b The number of is 6.4.

Table 5 shows the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 11-g, and the number of blue Sub-Pixels 11-b in the photometry region 33-5 from the first setting position to the thirteenth setting position. It is.

Table 6 is a table showing various values obtained based on the results of Table 5.

“No wobbling” indicates the case of the first setting position, “Up / down / left / right 1 pixel” indicates the average value from the first setting position to the fifth setting position, and “Up / down / left / right 2 pixels” The average value in the case of the 1st setting position to the 13th setting position is shown. In the case of the red Sub-Pixel 11-r, “no wobbling” is a value of 6.0 in the case of the first setting position shown in Table 5 (FIG. 13), and “one pixel in the vertical and horizontal directions” is shown in Table 5. The average value in the case of the first setting position to the fifth setting position is 5.90 (= (6.0 + 8.7 + 6.0 + 4.0 + 4.8) ÷ 5). Average value 5.85 from the 1st setting position to the 13th setting position (total value of the number of red Sub-Pixels in Table 5/13).

Δr, Δg, and Δb are 100% of the value obtained by dividing the number of red Sub-Pixels 11-r, the number of green Sub-Pixels 1-g, and the number of blue Sub-Pixels 11-b by the maximum value. Explaining “without wobbling”, the number of red sub-pixels 11-r (6.0), the number of green sub-pixels 1-g (6.6), and the number of blue sub-pixels 11-b (4.7). Of these, the number of green sub-pixels 11-g is the largest. Δr is 91% (= (6.0 / 6.6) * 100), Δg is 100% (= (6.6 / 6.6) * 100), and Δb is 71% ( = (4.7 / 6.6) * 100).

ΔMax is the maximum value among Δr, Δg, and Δb, and ΔMin is the minimum value among Δr, Δg, and Δb. Explaining “without wobbling”, among Δr (91%), Δg (100%), and Δb (71%), the maximum value is Δg (100%), and the minimum value is Δb (71%). is there.

It can be seen that the difference between ΔMax and ΔMin is smaller in “one pixel in the upper, lower, left, and right” and “two pixels in the upper, lower, left, and right” as compared with “no wobbling”. That is, the “upper and lower left and right one pixel” and the “upper and lower left and right two pixels” are compared with “no wobbling” and the number of red sub-pixels 11-r in the photometry area 33-5, green sub-pixels 11-g The difference in the number of blue sub-pixels 11-b can be reduced. Therefore, the “upper and lower left and right one pixel” and the “upper and lower left and right two pixels” can improve the measurement accuracy of the photometric quantity compared with “no wobbling”.

(Summary of embodiment)
A two-dimensional colorimetric apparatus according to an aspect of the embodiment is a two-dimensional colorimetric apparatus that measures a plurality of measurement regions in a color display screen, and includes first pixels arranged two-dimensionally, A plurality of photometric areas, each of which includes a two-dimensional imaging unit that captures a color image displayed on a color display screen and a plurality of photometric areas including two or more first pixels, corresponding to the plurality of measurement areas. And a determination unit that determines light measurement amounts of the plurality of measurement regions corresponding to each of the plurality of measurement regions, wherein the determination unit provides a plurality of setting positions of the photometry regions corresponding to the measurement regions, Based on the obtained photometric quantity of the measurement area, a first process for determining the photometric quantity of the measurement area is executed for each of the plurality of measurement areas.

The color display screen has second pixels arranged two-dimensionally. The second pixel includes a plurality of sub-pixels (for example, a red sub-pixel, a green sub-pixel, and a blue sub-pixel). The color image displayed on the color display screen may be a white image or an image of a color other than the primary color. In the case of a primary color image, even if the number of sub-pixels is different, the chromaticity is the same, so there is no measurement variation reduction effect according to the embodiment.

The determining unit provides a plurality of set positions of the photometry area corresponding to the measurement area, and performs a first process of determining the photometry of the measurement area based on the photometry of the measurement area obtained at each set position. The determination unit executes the first process for each of the plurality of measurement regions. For this reason, the photometric quantity can be averaged for each of the plurality of measurement areas (in the case of a color display screen, the difference in the number of sub-pixels of each color located in the photometry area can be reduced). Thus, according to the two-dimensional colorimetric apparatus according to one aspect of the embodiment, the photometric amount can be averaged for each of the plurality of measurement regions, so that even if the two-dimensional region is a color display screen, the photometric region The measurement accuracy of the photometric quantity can be improved without excessively increasing.

The first process is, for example, a process of determining an average value of the light measurement amount of the measurement area obtained at each set position as the light measurement amount of the measurement area.

The plurality of setting positions are, for example, a first setting position where the overlap between the measurement area and the photometry area is the largest, and the remaining setting where one or more of the one pixel is deviated from the first setting position. (Including one or more integers).

In the above configuration, the image processing apparatus further includes a storage unit that stores the image, and the determination unit executes the first process using the color image read from the storage unit.

According to this configuration, it is not necessary to take a color image displayed on the color display screen every time the setting position of the photometry area is changed, and thus the color display screen can be measured at high speed. A mode in which the two-dimensional imaging unit captures a color image displayed on the color display screen every time the setting position of the photometric area is changed is also possible. For example, when the setting position is changed five times, the two-dimensional imaging unit images the color image displayed on the color display screen five times.

In the above configuration, the areas of the photometry areas set at the plurality of setting positions are the same as each other.

According to this configuration, since the area of the photometry area is not changed according to the set position, the first process can be simplified.

In the configuration described above, the second process of calculating the colorimetric value of the measurement region based on the light measurement amount of the measurement region determined by the determination unit is performed on each of the plurality of measurement regions. 1 calculation part is further provided.

According to this configuration, since the calorimetric value is calculated based on the photometric quantity with improved measurement accuracy, the accuracy of the calorimetric value can be improved.

In the above-described configuration, a second process of calculating a luminance value of the measurement region based on the light measurement amount of the measurement region determined by the determination unit is performed for each of the plurality of measurement regions. A calculation unit is further provided.

According to this configuration, since the luminance value is calculated based on the photometric quantity with improved measurement accuracy, the accuracy of the luminance value can be improved.

A two-dimensional colorimetric method according to another aspect of the embodiment is a two-dimensional colorimetric method for measuring a plurality of measurement regions in a color display screen, and the two-dimensional colorimetric method includes first pixels arranged two-dimensionally. An imaging step of imaging a color image displayed on the color display screen by an imaging unit and a plurality of photometric areas including two or more first pixels are set corresponding to the plurality of measuring areas, and the plurality Determining a photometric quantity of the plurality of measurement areas corresponding to each of the photometric areas, wherein the determining step provides a plurality of setting positions of the photometric areas corresponding to the measurement areas, Based on the photometric amount of the measurement area obtained at the set position, a first process for determining the photometric amount of the measurement area is executed for each of the plurality of measurement areas.

The two-dimensional colorimetric method according to another aspect of the embodiment defines the two-dimensional colorimetric apparatus according to one aspect of the embodiment from the viewpoint of the method, and the two-dimensional colorimetric apparatus according to one aspect of the embodiment It has the same effect.

Although embodiments of the present invention have been illustrated and described in detail, it is merely exemplary and illustrative and not limiting. The scope of the invention should be construed by the language of the appended claims.

The entire disclosure of Japanese Patent Application No. 2017-116617 filed on June 14, 2017 is incorporated herein by reference in its entirety.

According to the present invention, a two-dimensional color measurement device and a two-dimensional color measurement method can be provided.

Claims

A two-dimensional colorimetric device for measuring a plurality of measurement areas in a color display screen,
A two-dimensional imaging unit having first pixels arranged two-dimensionally and imaging a color image displayed on the color display screen;
A determination unit configured to set a plurality of photometric areas including two or more first pixels corresponding to the plurality of measurement areas, and to determine the photometric amounts of the plurality of measurement areas corresponding to the plurality of photometric areas, respectively. And comprising
The determination unit provides a plurality of setting positions of the photometry area corresponding to the measurement area, and determines the photometry quantity of the measurement area based on the photometry quantity of the measurement area obtained at each of the setting positions. A two-dimensional colorimetric apparatus that executes a first process on each of the plurality of measurement regions.
A storage unit for storing the color image;
The two-dimensional colorimetric apparatus according to claim 1, wherein the determination unit executes the first process using the color image read from the storage unit.
3. The two-dimensional measurement according to claim 1, wherein the first process is a process of determining an average value of the light measurement amount of the measurement region obtained at each of the set positions as a light measurement amount of the measurement region. Color device.
The plurality of setting positions include a first setting position where the overlap between the measurement area and the photometry area is the largest, and the remaining setting positions in which one or more of the first pixels are shifted from the first setting position. The two-dimensional colorimetric apparatus according to any one of claims 1 to 3, further comprising:
The two-dimensional colorimetric apparatus according to any one of claims 1 to 4, wherein areas of the photometric areas set in each of the plurality of setting positions are the same.
A first calculation unit configured to execute, for each of the plurality of measurement regions, a second process of calculating a colorimetric value of the measurement region based on the photometric amount of the measurement region determined by the determination unit; The two-dimensional colorimetric device according to any one of claims 1 to 5, further comprising:
A second calculation unit that executes a third process for calculating the luminance value of the measurement region based on the photometric amount of the measurement region determined by the determination unit, for each of the plurality of measurement regions; The two-dimensional colorimetric apparatus according to any one of claims 1 to 6, further comprising:
The two-dimensional colorimetric apparatus according to any one of claims 1 to 7, wherein the color display screen has a structure in which second pixels including a plurality of color sub-pixels are two-dimensionally arranged.
A two-dimensional colorimetric method for measuring a plurality of measurement areas in a color display screen,
An imaging step of imaging a color image displayed on the color display screen by a two-dimensional imaging unit having first pixels arranged two-dimensionally;
A determination step of setting a plurality of photometric areas including two or more first pixels in correspondence with the plurality of measurement areas, and determining a photometric quantity of the plurality of measurement areas corresponding to each of the plurality of photometric areas. And comprising
In the determining step, a plurality of setting positions of the photometry area corresponding to the measurement area are provided, and the photometry quantity of the measurement area is determined based on the photometry quantity of the measurement area obtained at each of the setting positions. A two-dimensional colorimetric method, wherein a first process is executed for each of the plurality of measurement regions.