WO2017164134A1 - 二次元測色装置 - Google Patents
二次元測色装置 Download PDFInfo
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- WO2017164134A1 WO2017164134A1 PCT/JP2017/011030 JP2017011030W WO2017164134A1 WO 2017164134 A1 WO2017164134 A1 WO 2017164134A1 JP 2017011030 W JP2017011030 W JP 2017011030W WO 2017164134 A1 WO2017164134 A1 WO 2017164134A1
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- 238000005259 measurement Methods 0.000 title claims abstract description 355
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J2003/467—Colour computing
Definitions
- the present invention relates to, for example, a technique for measuring the color of a display screen.
- the two-dimensional color measurement device has a feature that can measure colors in a plurality of measurement areas at the same time, and is used for color measurement in a two-dimensional area.
- the two-dimensional region is a screen of a display such as a liquid crystal display or an organic electroluminescence display.
- Patent Document 1 is a stimulus value direct-reading type two-dimensional colorimetric device that measures colors at each point in a two-dimensional measurement object, and is formed by arranging a plurality of micromirrors two-dimensionally and entering through an objective lens.
- the micromirror array that can reflect the reflected light by sequentially scanning in three or more different directions outside the optical path from the objective lens, and outside the optical path from the objective lens to the micromirror array, From the two-dimensional sensor unit that receives light scanned in the three or more reflection directions of the micromirror array, and the light intensity measured by each sensor element of each two-dimensional sensor unit, the two-dimensional measurement object
- a two-dimensional colorimetric apparatus including a calculation unit that calculates a color at each point.
- Patent Document 2 discloses first, second, and third optical filters that split light from a sample into a three-dimensional color system, and light that has passed through the first, second, and third optical filters.
- two-dimensional light receiving detection means for receiving light at a plurality of measurement points on the sample surface, spectral detection means for detecting a spectral distribution for light from a specific point among the measurement points, and Tristimulus value calculation means for calculating the tristimulus value of the three-dimensional color system, and the specific point using the relationship between the calculated tristimulus value and the detection result of the two-dimensional light receiving detection means at the specific point And a calculation means for calculating the tristimulus values from the detection results of the three-dimensional light receiving detection means for the measurement points other than the above.
- Patent Document 3 discloses that a measurement area to be measured is divided into a plurality of areas and scanned, a scanning optical unit that captures light from each of the divided measurement areas, and each area that is captured by the scanning optical unit
- a light collecting unit for collecting the light from the light a light path separating unit arranged on the light path of the collected light, and separating the light collected into first and second light paths, and the first
- An imaging unit that is arranged on the optical path and acquires image data for each of the divided measurement areas, and a spectral measurement unit that is arranged on the second optical path and acquires spectral data for each of the divided measurement areas
- a color luminance measuring device comprising:
- a scanning optical unit is disposed between a measurement target and an optical path separation unit. This is to acquire image data and spectral data based on the same light over the entire region regardless of the position of the measurement region and the incident direction of the light to be measured (paragraph 0024 of Patent Document 3). ).
- CCFLs cold cathode fluorescent lamps
- LEDs Light Emitting Diodes
- the liquid crystal display has a plurality of LEDs as a backlight (in a large liquid crystal display, for example, 1000 LEDs are used as a backlight).
- the spectral radiance of LEDs varies among individual products. More specifically, among red LEDs of the same product, there are red LEDs having a peak wavelength of, for example, 600 nm and red LEDs having a peak wavelength of, for example, 610 nm.
- the organic electroluminescence display is a self-luminous display using OLED (Organic Light Emitting Diode).
- OLED Organic Light Emitting Diode
- the luminance of each pixel of the display is determined by the film thickness of each layer constituting the OLED and the current flowing through the OLED.
- the organic electroluminescence display varies in chromaticity and luminance depending on the position on the screen.
- the liquid crystal display and the organic electroluminescence display vary in chromaticity and luminance depending on the position on the screen, and thus unevenness occurs in the chromaticity and luminance of the screen. Therefore, in the display production process, it is necessary to measure the chromaticity and luminance of the screen of the display using a two-dimensional colorimetric device and adjust them. In order to adjust accurately, the chromaticity and brightness of the display screen need to be accurately measured.
- the two-dimensional colorimetric apparatus disclosed in Patent Document 2 uses a spectroscopic sensor to measure a tristimulus value (true value) at one specific point on a two-dimensional region, and corrects the tristimulus value using the tristimulus value.
- a coefficient is calculated in advance, and the tristimulus values of each of a plurality of measurement points on the two-dimensional region measured using the imaging unit are corrected using the correction coefficient.
- the specific point and the measurement point are referred to as a measurement region.
- the two-dimensional colorimetric device disclosed in Patent Document 2 calculates a correction coefficient using the tristimulus values of one measurement region as a representative. If there is no unevenness in the chromaticity and brightness of the two-dimensional region, it is considered that the tristimulus values can be accurately corrected for each of the plurality of measurement regions using the two-dimensional colorimetric device disclosed in Patent Document 2. .
- a liquid crystal display using a plurality of LEDs as a backlight and an organic electroluminescence display have uneven chromaticity and luminance of the screen.
- the two-dimensional colorimetric device corrects each tristimulus value in a plurality of measurement regions using the correction coefficient calculated using the tristimulus values in one measurement region, it is accurate. Chromaticity and brightness cannot be obtained.
- the two-dimensional color measurement device disclosed in Patent Document 3 obtains a correction coefficient for each of a plurality of measurement regions on the display screen (paragraph 0105 of Patent Document 3).
- the inventor has created a two-dimensional colorimetric device that can realize the following object with a configuration different from that of Patent Document 3.
- the present invention provides a two-dimensional that can correct tristimulus values accurately for each of a plurality of measurement regions included in a two-dimensional region even when the chromaticity and luminance of light from the two-dimensional region to be measured are uneven.
- An object is to provide a color measuring device.
- a two-dimensional colorimetric device that achieves the above object is a two-dimensional colorimetric device that measures a plurality of measurement regions included in a two-dimensional region, and includes an optical system, an imaging unit, and a light selection unit.
- the optical system forms a first optical path and a second optical path as optical paths of light from the two-dimensional region.
- the imaging unit includes a two-dimensional imaging device, is disposed in the first optical path, and captures a color image of the two-dimensional region.
- the light selection unit is disposed in the second optical path, and selects light from one measurement region out of light from the two-dimensional region.
- the selection control unit causes the light selection unit to select light from the plurality of measurement regions.
- the optical sensor unit has a function of receiving light from a region having an area equal to or smaller than the measurement region, receives light from a plurality of the measurement regions selected by the light selection unit, and a plurality of the measurement A signal indicating the photometric amount of each area is output.
- the first calculation unit calculates tristimulus values of the plurality of measurement regions using the color image information signal of the two-dimensional region output from the imaging unit.
- the second calculation unit calculates the tristimulus values of each of the plurality of measurement regions using a signal indicating the light measurement amounts of the plurality of measurement regions output from the optical sensor unit.
- the third calculation unit uses one tristimulus value calculated by the first calculation unit and one tristimulus value calculated by the second calculation unit for one measurement region,
- the process for calculating the correction coefficient for the measurement area is referred to as a correction coefficient calculation process, and the correction coefficient calculation process is performed for each of the plurality of measurement areas.
- FIG. 6 is a flowchart illustrating a correction coefficient acquisition mode in the two-dimensional colorimetric apparatus according to the present embodiment.
- 10 is a flowchart illustrating step S1 in FIG. 9. It is a flowchart explaining the process of step S4 of FIG. 5 is a flowchart illustrating a color measurement mode in the two-dimensional color measurement device according to the present embodiment. It is explanatory drawing explaining an example of several measurement area
- FIG. 6 is an explanatory diagram for explaining spectral sensitivities of a first filter to a sixth filter. It is a schematic diagram of a spectroscopic type optical sensor part. It is a schematic diagram of an optical sensor part of a filter rotation type.
- FIG. 1 is a schematic diagram illustrating a state in which the two-dimensional colorimetric apparatus 1 according to the present embodiment measures a screen SC of a liquid crystal display.
- the measurement object of the two-dimensional color measuring device 1 is a two-dimensional region.
- the two-dimensional colorimetric device 1 is a self-luminous two-dimensional area (an image is displayed when the two-dimensional area itself outputs light) or a non-self-luminous two-dimensional area (a two-dimensional area). Any one of illumination light and an image displayed by the reflected light can be set as a measurement object.
- the screen SC of the liquid crystal display is an example of a non-self-emitting two-dimensional area.
- the characteristics (for example, chromaticity) relating to the color of the screen SC of the liquid crystal display and the luminance of the screen SC are measured by the two-dimensional colorimetric device 1.
- the color measurement of the screen SC of the liquid crystal display will be described as an example, but it can be applied to the color measurement of the screen of another display.
- FIG. 2 is a schematic plan view of the screen SC of the liquid crystal display.
- the screen SC is divided into, for example, 40 measurement areas 20-1 to 20-40. When these measurement areas are not distinguished, they are referred to as measurement areas 20.
- the screen SC is composed of a large number of pixels. A plurality of adjacent pixels may be one measurement region 20, and one pixel may be one measurement region 20.
- the two-dimensional color measuring device 1 measures 40 measurement areas 20 simultaneously. This is because the two-dimensional colorimetric apparatus 1 measures the entire screen SC. Note that the two-dimensional colorimetric apparatus 1 can also measure a part of the screen SC. In this case, two or more and less than 40 measurement regions 20 (for example, five measurement regions 20) become a plurality of measurement regions 20.
- FIG. 3 is a block diagram showing the configuration of the two-dimensional colorimetric apparatus 1 according to this embodiment.
- the two-dimensional colorimetric apparatus 1 includes an objective optical system 2, a mirror unit 3, a switching unit 4, an imaging unit 5, a DMD 6, a condensing optical system 7, an optical sensor unit 8, a control processing unit 9, an input unit 10, and an output unit 11. Is provided.
- Objective optical system 2 includes an optical lens and focuses light L from the entire screen SC.
- the entire screen SC is in a state of emitting light in a predetermined color (for example, red).
- the mirror unit 3 and the switching unit 4 constitute an optical system.
- the optical system forms a first optical path 21 and a second optical path 22 as the optical path of the light L from the screen SC.
- the switching unit 4 switches the position of the mirror unit 3 between the first position and the second position by rotating the mirror unit 3 by a predetermined angle about one side of the mirror unit 3 as a central axis.
- a step motor or a rotary solenoid can be used as the switching unit 4.
- FIG. 3 shows that the position of the mirror unit 3 is at the first position.
- the first position is a position where the mirror unit 3 can reflect the light L focused by the objective optical system 2, and is a position where the light L focused by the objective optical system 2 is guided to the first optical path 21.
- the mirror unit 3 is a total reflection mirror.
- FIG. 4 is an explanatory diagram for explaining that the position of the mirror unit 3 is in the second position in the block diagram shown in FIG.
- the second position is a position where the mirror unit 3 cannot reflect the light L focused by the objective optical system 2, and is a position where the light L focused by the objective optical system 2 is guided to the second optical path 22. 4 is different from FIG. 3 in that the light L is guided to the second optical path 22 and reflected by the DMD 6.
- the imaging unit 5 is disposed in the first optical path 21.
- the imaging unit 5 is disposed at a position where the light L from the screen SC is imaged.
- the imaging unit 5 includes a color filter 51 and a two-dimensional imaging element 52.
- the color filter 51 includes a filter that transmits only the R component, a filter that transmits only the G component, and a filter that transmits only the B component.
- the two-dimensional imaging device 52 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 image sensor 52 receives the light L through the color filter 51 to capture the entire color image of the screen SC and outputs an electrical signal indicating information of the captured color image. This is the color image information signal SG1 output from the imaging unit 5.
- the color filter 51 includes a plurality of R filters having a spectral transmittance Fr ( ⁇ ), a plurality of G filters having a spectral transmittance Fg ( ⁇ ), and a plurality of B filters having a spectral transmittance Fb ( ⁇ ). . These filters are arranged in a check pattern. Each pixel constituting the two-dimensional image sensor 52 receives the light L that has passed through one of the R filter, G filter, and B filter.
- a DMD (Digital Micromirror Device) 6 is disposed in the second optical path 22.
- the DMD 6 selectively reflects the light L traveling in the second optical path 22 toward the condensing optical system 7.
- the DMD 6 is an example of a light selection unit.
- the light selection unit is arranged in the second optical path 22 and selects light La from one measurement region 20 (FIG. 2) among the light L from the screen SC.
- the light selector can be realized by a spatial light modulator such as DMD6.
- a spatial light modulator using liquid crystal liquid crystal spatial light modulator
- Liquid crystals are classified into a transmission type that selectively transmits incident light and a reflection type that reflects (LCOS: Liquid Crystal On Silicon). Either type can be applied to this embodiment.
- FIG. 5 is a plan view of the DMD 6.
- FIG. 6 is an explanatory diagram for explaining that the DMD 6 selectively reflects light.
- DMD 6 has a structure in which a large number of micromirrors 61 are arranged in a matrix.
- the angle at which the micromirror 61 reflects the light L traveling on the second optical path 22 toward the condensing optical system 7 (that is, the angle at which the light is reflected toward the optical sensor unit 8) is set as the selection angle.
- the angle at which the micromirror 61 does not reflect the light L traveling on the second optical path 22 toward the condensing optical system 7 is the non-selection angle.
- the DMD 6 selectively reflects the light La from one measurement region 20 (for example, the measurement region 20-1) shown in FIG. 2 among the light L that travels along the second optical path 22, the DMD 6 measures the measurement region 20 (
- the angle of the micro mirror 61 corresponding to the measurement region 20-1) is set as a selected angle, and the angles of the other micro mirrors 61 are set as non-selected angles.
- the light La is reflected toward the condensing optical system 7 by the micro mirror 61 having the selected angle.
- the angle of one micromirror 61 is a selected angle, but the longitudinal sectional area of the light La at the position where the light La is reflected by the micromirror 61 (the area of the cross section perpendicular to the traveling direction of the light L). ), The number of micromirrors 61 to be selected is determined.
- the condensing optical system 7 includes an optical lens, and condenses the light La selectively reflected by the DMD 6 by the optical sensor unit 8.
- the optical sensor unit 8 is arranged at a position where the light La from one measurement region 20 forms an image among the light L from the screen SC. As shown in FIG. 2, the optical sensor unit 8 has a function of receiving light from a region having an area equal to or smaller than one measurement region 20 (so-called spot region 23), and light La from one measurement region 20. Is received, and an electric signal indicating the photometric quantity of one measurement region 20 is output. This electric signal is the signal SG2 shown in FIG.
- the optical sensor unit 8 is used for color measurement with higher accuracy than the color measurement using the imaging unit 5.
- FIG. 7 is a schematic diagram of an example of the optical sensor unit 8.
- the optical sensor unit 8 includes photodiodes 80a, 80b, and 80c, an X filter 87a, a Y filter 87b, and a Z filter 87c.
- the photodiode 80a receives the light La that has passed through the X filter 87a
- the photodiode 80b receives the light La that has passed through the Y filter 87b
- the photodiode 80c receives the light La that has passed through the Z filter 87c.
- tristimulus values are X, Y, and Z
- color matching functions are x ( ⁇ ), y ( ⁇ ), and z ( ⁇ ).
- the spectral sensitivity obtained by combining the spectral sensitivity of the X filter 87a and the spectral sensitivity of the photodiode 80a is a spectral sensitivity that matches the color matching function x ( ⁇ ).
- the spectral sensitivity obtained by combining the spectral sensitivity of the Y filter 87b and the spectral sensitivity of the photodiode 80b is a spectral sensitivity that matches the color matching function y ( ⁇ ).
- the spectral sensitivity obtained by combining the spectral sensitivity of the Z filter 87c and the spectral sensitivity of the photodiode 80c is a spectral sensitivity that matches the color matching function z ( ⁇ ).
- Spectral sensitivity can be referred to as spectral response.
- the photodiode 80a When the photodiode 80a receives the light La that has passed through the X filter 87a, the photodiode 80a outputs a light reception signal indicating X.
- the photodiode 80b receives the light La that has passed through the Y filter 87b, the photodiode 80b outputs a light reception signal indicating Y.
- the photodiode 80c receives the light La that has passed through the Z filter 87c
- the photodiode 87c outputs a light reception signal indicating Z.
- these light reception signals are sent to the control processing unit 9 as a signal SG ⁇ b> 2 indicating the light measurement amount of one measurement region 20.
- control processing unit 9 is a microcomputer realized by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.
- the control processing unit 9 includes, as functional blocks, a selection control unit 91, a first calculation unit 92, a second calculation unit 93, a third calculation unit 94, a storage unit 95, a correction unit 96, and a luminance chromaticity calculation unit 97. And a mode setting unit 98.
- the selection control unit 91 controls the DMD 6 (an example of a light selection unit) to cause the DMD 6 to select light from the plurality of measurement regions 20.
- FIG. 8 is an explanatory diagram for explaining the relationship among the measurement region 20 of the screen SC, the pixel 53 of the two-dimensional image sensor 52, and the micromirror 61 of the DMD 6.
- the screen SC is virtually divided into m ⁇ n measurement areas 20. In the y direction (vertical direction) of the screen SC, the number of measurement areas 20 is m, and in the x direction (horizontal direction) of the screen SC, the number of measurement areas 20 is n.
- the screen SC has a structure in which a large number of pixels 24 are arranged in a matrix.
- One measurement region 20 includes a plurality of adjacent pixels 24. In the present embodiment, the number of pixels constituting one measurement region 20 will be described as an example.
- the two-dimensional image sensor 52 is composed of m ⁇ n pixels 53.
- the number of pixels 53 is m
- the number of pixels 53 is n.
- the DMD 6 is composed of m ⁇ n micro mirrors 61.
- the number of micromirrors 61 is m
- the number of micromirrors 61 is n.
- the positions of the measurement region 20, the pixel 53, and the micromirror 61 are specified by coordinates (i, j).
- i is an x coordinate value and is an integer of 1 to n.
- j is a y coordinate value and is an integer of 1 to m.
- the positions of the measurement region 20-1, the pixel 53-1, and the micromirror 61-1 are the coordinates (1, 1).
- the number of measurement regions 20, the number of pixels 53 of the two-dimensional image sensor 52, and the number of micromirrors 61 of the DMD 6 are the same, and the y direction 2, the number of the measurement regions 20, the number of the pixels 53 of the two-dimensional imaging device 52, and the number of the micromirrors 61 of the DMD 6 are the same, and the measurement region 20, the pixels 53, and the micromirrors 61 are one-to-one.
- the measurement region 20-1 located at the coordinate (1,1), the pixel 53-1 located at the coordinate (1,1), and the micromirror 61-1 located at the coordinate (1,1) correspond to each other. is doing.
- the pixel 53-1 can receive the light La (FIG. 4) from the measurement region 20-1
- the micromirror 61-1 can reflect the light La from the measurement region 20-1. it can.
- the number of pixels of the screen SC of the liquid crystal display is 5 * 8
- the number of pixels of the two-dimensional image sensor 52 is 5 * 8
- the number of pixels of the DMD 6 is 5 * 8. is doing.
- the number of pixels of the screen SC of the liquid crystal display is m_display (vertical) * n_display (horizontal direction)
- the number of pixels of the two-dimensional image sensor 52 is m_2d (vertical) * n_2d (horizontal direction)
- the number of pixels of DMD6 Is m_dmd (vertical) * n_dmd (horizontal direction).
- selection control unit 91 controls DMD 6 to select the angle of micromirror 61 (that is, micromirror 61-1) located at coordinates (1, 1).
- the angle of the micromirror 61 other than this is set as a non-selection angle.
- the selection control unit 91 controls the DMD 6 to set the angle of the micromirror 61 located at the coordinates (2, 1) as the selected angle and set the other angles of the micromirror 61 as non-selected angles.
- the light La from the measurement region 20 located at the coordinates (2, 1) is reflected by the micromirror 61 located at the coordinates (2, 1) and travels toward the condensing optical system 7.
- the same control is performed for each of the micromirrors 61 located at coordinates (3, 1) to coordinates (n, m).
- the optical sensor unit 8 sequentially receives the light from the plurality of measurement regions 20 selected in order by the DMD 6, and outputs a signal SG ⁇ b> 2 indicating the light measurement amount of the measurement region 20 for each of the plurality of measurement regions 20. Output in order.
- the selection control unit 91 changes the light from the plurality of measurement regions 20 for each light from one measurement region 20 (in other words, the light from one measurement region 20 as a unit). To select in order.
- the selection control unit 91 causes the DMD 6 to select light from the plurality of measurement regions 20 in a predetermined order, but the light may be randomly selected.
- the tristimulus values are X, Y, and Z
- the color matching functions are x ( ⁇ ), y ( ⁇ ), and z ( ⁇ ).
- the spectral transmittances of the color filters for obtaining X, Y, and Z are Fx ( ⁇ ), Fy ( ⁇ ), and Fz ( ⁇ ), respectively.
- the spectral response of the two-dimensional image sensor 52 is Sm ( ⁇ ). In the measurement region 20 located at the coordinates (i, j) shown in FIG.
- the spectral radiance of the measurement region 20 is E (i, j, ⁇ ), and X, Y, and Z of the measurement region 20 are Let X (i, j), Y (i, j), and Z (i, j).
- Sm ( ⁇ ) * Fx ( ⁇ ), Sm ( ⁇ ) * Fy ( ⁇ ), and Sm ( ⁇ ) * Fz ( ⁇ ) are the combined spectral response.
- An optical filter having Fx ( ⁇ ) capable of matching Sm ( ⁇ ) * Fx ( ⁇ ) with ⁇ x ( ⁇ ), and matching Sm ( ⁇ ) * Fy ( ⁇ ) with ⁇ y ( ⁇ ) If an optical filter having Fy ( ⁇ ) and an optical filter having Fz ( ⁇ ) that can match Sm ( ⁇ ) * Fz ( ⁇ ) and ⁇ z ( ⁇ ) can be realized, the following formula 1 Is established.
- the correction matrix coefficient A (i, j) is a 3 ⁇ 3 matrix and varies depending on the coordinates (i, j).
- the reason why the correction matrix coefficient is A (i, j) is that the spectral radiance differs from place to place due to the influence of color unevenness and brightness unevenness of the display device.
- Equation 2 can be rewritten as Equation 3 below.
- ⁇ Sm ( ⁇ ) * Fg ( ⁇ ) * E (i, j, ⁇ ) d ⁇ indicates a G signal corresponding to the coordinates (i, j) output from the two-dimensional image sensor 52.
- ⁇ Sm ( ⁇ ) * Fb ( ⁇ ) * E (i, j, ⁇ ) d ⁇ indicates a B signal corresponding to the coordinates (i, j) output from the two-dimensional image sensor 52.
- Equation 3 can be modified as follows.
- RGB color filters have higher spectral transmittance than XYZ color filters. Therefore, if an RGB color filter is used as the color filter 51 of the imaging unit 5, the exposure time when the imaging unit 5 captures the screen SC can be shortened, and as a result, the color measurement time can be shortened. Therefore, in the present embodiment, the correction matrix is calculated using Equation 4, RGB of the measurement region 20 located at the coordinates (i, j), and tristimulus values XYZ of the measurement region 20 located at the coordinates (i, j). The coefficient A (i, j) is obtained.
- the first calculation unit 92 calculates the light quantity RGB of each of the plurality of measurement regions 20 using the color image information signal SG1 of the screen SC output from the imaging unit 5. As described above, the first calculation unit 92 calculates R (i, j), G (i, j), and B (i, j) expressed by Expression 4 for the measurement region 20 located at each coordinate. .
- the second calculation unit 93 calculates the tristimulus values XYZ of each of the plurality of measurement regions 20 using the signal SG2 indicating the light measurement amount of the measurement region 20 output in order from the optical sensor unit 8. As described above, the second calculation unit 93 calculates X (i, j), Y (i, j), and Z (i, j) represented by Expression 4 for the measurement region 20 located at each coordinate. .
- the third computing unit 94 computes the correction matrix coefficient A (i, j) expressed by Equation 4. That is, the third calculation unit 94 uses, for one measurement region 20, the photometric quantity RGB calculated by the first calculation unit 92 and the tristimulus values XYZ calculated by the second calculation unit 93.
- the process of calculating the correction coefficient for one measurement region 20 is referred to as a correction coefficient calculation process, and the correction matrix coefficient calculation process is performed for each of the plurality of measurement regions 20.
- the two-dimensional colorimetric apparatus 1 acquires a plurality of correction coefficients (correction matrix coefficient A (1, 1) to correction matrix coefficient A (n, m)) corresponding to each of the plurality of measurement regions 20. Referring to FIG.
- the third calculation unit 94 includes the measurement region 20-1 calculated by the first calculation unit 92.
- the correction matrix coefficient A (1, 1) is calculated using the light measurement amounts RGB and the tristimulus values XYZ of the measurement region 20-1 calculated by the second calculation unit 93.
- correction coefficients (correction matrix coefficient A (1, 1) to correction matrix coefficient A (n, m)) calculated by third calculation unit 94 are stored in storage unit 95.
- the two-dimensional colorimetric apparatus 1 includes a correction coefficient acquisition mode for acquiring a plurality of correction coefficients in advance, and a colorimetry mode for measuring colors (chromaticity, luminance, etc.) of the plurality of measurement regions 20 using these correction coefficients. , Can be performed.
- the mode setting unit 98 selectively sets the correction coefficient acquisition mode and the color measurement mode.
- the first calculation unit 92 calculates the light quantity RGB of each of the plurality of measurement regions 20 using the color image information signal SG1 of the screen SC output from the imaging unit 5, and the second The calculation unit 93 calculates the tristimulus values XYZ of each of the plurality of measurement regions 20 using the signal SG2 indicating the light measurement amount of the measurement region 20 sequentially output from the optical sensor unit 8, and performs the third calculation.
- the unit 94 calculates a plurality of correction coefficients corresponding to each of the plurality of measurement regions 20, and the storage unit 95 converts each of the plurality of correction coefficients calculated by the third calculation unit 94 to the plurality of measurement regions 20. And store them in correspondence.
- the first calculation unit 92 calculates the light quantity RGB of each of the plurality of measurement regions 20 using the color image information signal SG1 of the screen SC output from the imaging unit 5.
- the correction unit 96 correlates the photometric light amounts RGB calculated by the first calculation unit 92 in the colorimetry mode with respect to one measurement region 20 in association with the one measurement region 20 and is stored in the storage unit 95.
- the correction processing is performed as correction processing, and correction processing is performed for each of the plurality of measurement regions 20 in the color measurement mode.
- Equation 4 is used, and the light measurement amounts RGB are set to tristimulus values XYZ.
- the input unit 10 is a device for inputting commands (commands), data, and the like from the outside to the two-dimensional colorimetric device 1, and is realized by a keyboard.
- a mouse or a touch panel may be used as the input unit 10.
- the output unit 11 is a device for outputting commands and data input from the input unit 10, the calculation result of the control processing unit 9, and the like, and is realized by a display.
- a printing apparatus such as a printer may be used as the output unit 11.
- the calculation result of the control processing unit 9 includes the luminance and chromaticity of each of the plurality of measurement areas 20 calculated by the luminance chromaticity calculation unit 97.
- FIG. 9 is a flowchart for explaining the correction coefficient acquisition mode in the two-dimensional colorimetric apparatus 1 according to the present embodiment.
- This mode includes a step S1 for obtaining data relating to the red color of the screen SC, a step S2 for obtaining data relating to the green color of the screen SC, a step S3 for obtaining data relating to the blue color of the screen SC, and a plurality of these data.
- Step 4 for calculating the correction coefficient.
- FIG. 10 is a flowchart for explaining step S1 in FIG. 3 and 10, when the operator of the two-dimensional colorimetric apparatus 1 inputs a command for executing the correction coefficient acquisition mode using the input unit 10, the mode setting unit 98 acquires the correction coefficient. Set to mode.
- the entire screen SC is displayed in red (step S11).
- a liquid crystal display having a screen SC and a personal computer for controlling the two-dimensional colorimetric apparatus 1.
- the control signal is transmitted to the liquid crystal display having the screen SC.
- the two-dimensional colorimetric device 1 may include a display control circuit for display so that the two-dimensional colorimetric device 1 transmits the control signal to the liquid crystal display having the screen SC.
- the selection control unit 91 controls the switching unit 4 to set the position of the mirror unit 3 to the first position shown in FIG. 3 (step S12).
- the control processing unit 9 instructs the imaging unit 5 to capture a color image. Thereby, the imaging part 5 image
- the control processing unit 9 receives the color image information signal SG1 output in step S13.
- the first computing unit 92 computes the photometric quantity RGB of the measurement region 20 for all of the m ⁇ n measurement regions 20 shown in FIG. 8 using the received signal SG1 (step S14). This is the photometric RGB in a state where the entire screen SC is displayed in red, and is described as Rr (i, j), Gr (i, j), Br (i, j).
- the first calculation unit 92 is output from the pixel 53-1 located at the coordinate (1, 1).
- Rr (1,1), Gr (1,1), Br (1,1) in the measurement region 20-1 are calculated using the obtained signals.
- the selection control unit 91 controls the switching unit 4 to set the position of the mirror unit 3 to the second position shown in FIG. 4 (step S15).
- the control processing unit 9 sets the x coordinate value i to 1 and the y coordinate value j to 1 (step S16).
- the control processing unit 9 controls the DMD 6 to set the angle of the micromirror 61 located at the coordinates (i, j) shown in FIG.
- the angle of the micromirror 61 is set to a non-selection angle (step S17).
- the angle of the micromirror 61-1 located at the coordinates (1, 1) is set as the selected angle.
- the optical sensor unit 8 receives the light La reflected by the micromirror 61-1, and a signal SG2 indicating the photometric quantity of the measurement region 20 located at the coordinates (i, j). Output as. Since the coordinate (1, 1) is selected, the optical sensor unit 8 outputs a signal SG2 indicating the light measurement amount of the measurement region 20-1 located at the coordinate (1, 1).
- second calculation unit 93 uses signal SG2 received by control processing unit 9 to calculate tristimulus values XYZ located at coordinates (i, j) shown in FIG. Calculation is performed (step S18).
- This is the tristimulus value XYZ in a state where the entire screen SC is displayed in red, and is described as Xr (i, j), Yr (i, j), Zr (i, j).
- the second calculation unit 93 uses the signal SG2 output from the optical sensor unit 8 to measure the measurement region.
- Xr (1,1), Yr (1,1) and Zr (1,1) of 20-1 are calculated.
- control processing unit 9 determines whether or not the x coordinate value i is n (step S19).
- control processing unit 9 determines that the x coordinate value i is not n (No in Step S19), it sets i + 1 as the x coordinate value i (Step S20). Then, the control processing unit 9 returns to step S17.
- step S21 the control processing unit 9 determines whether the y-coordinate value j is m (step S21).
- control processing unit 9 determines that the y coordinate value j is not m (No in step S21), it sets j + 1 as the y coordinate value j (step S22). Then, the control processing unit 9 returns to step S17.
- step S1 the process of step S1 shown in FIG.
- step S2 the arithmetic control unit starts the process of step S2 shown in FIG.
- the two-dimensional colorimetric apparatus 1 performs the same processing as steps S12 to S22 in FIG.
- the first calculation unit 92 calculates Rg (i, j), Gg (i, j), and Bg (i, j) in step S14. This is the light measurement amount RGB in a state where the entire screen SC is displayed in green.
- step S18 the second computing unit 93 computes Xg (i, j), Yg (i, j), Zg (i, j). This is the tristimulus values XYZ in a state where the entire screen SC is displayed in green.
- the control processing unit 9 starts the process of step S3 of FIG. 9 after performing the process of step S2 of FIG. With the control signal from the personal computer (not shown), the two-dimensional colorimetric apparatus 1 performs the same processing as steps S12 to S22 in FIG. 10 with the entire screen SC displayed in blue.
- the first calculation unit 92 calculates Rb (i, j), Gb (i, j), and Bb (i, j) in step S14. This is the light measurement amount RGB in a state where the entire screen SC is displayed in blue.
- the second computing unit 93 computes Xb (i, j), Yb (i, j), Zb (i, j) in step S18. This is the tristimulus values XYZ in a state where the entire screen SC is displayed in blue.
- FIG. 11 is a flowchart illustrating the process in step S4 of FIG.
- the third calculation unit 94 sets the x coordinate value i to 1 and the y coordinate value j to 1 (step S31).
- the third calculator 94 calculates the correction matrix coefficient A (i, j) (step S32).
- the third computing unit 94 computes the correction matrix coefficient A (i, j) using the following formulas 5 to 7.
- the third calculation unit 94 corrects using the value obtained in step S1 in FIG. 9, the value obtained in step S2 in FIG. 9, and the value obtained in step S3 in FIG.
- the matrix coefficient A (1, 1) is calculated.
- step S1 in FIG. 9 The values obtained in step S1 in FIG. 9 are Xr (1,1), Yr (1,1), Zr (1,1) obtained from the optical sensor unit 8, and the two-dimensional image sensor 52. Rr (1,1), Gr (1,1), and Br (1,1) obtained from the above.
- step S2 in FIG. 9 The values obtained in step S2 in FIG. 9 are Xg (1, 1), Yg (1, 1), Zg (1, 1) obtained from the optical sensor unit 8, and the two-dimensional image sensor 52. Rg (1,1), Gg (1,1), and Bg (1,1) obtained from
- step S3 in FIG. 9 The values obtained in step S3 in FIG. 9 are Xb (1,1), Yb (1,1), Zb (1,1) obtained from the optical sensor unit 8, and the two-dimensional image sensor 52. Rb (1,1), Gb (1,1), and Bb (1,1) obtained from
- the correction matrix coefficient A (1, 1) is a 3 * 3 matrix, there are nine unknowns. Since there are nine equations in the equations (5) to (7), the correction matrix coefficient A (1, 1) can be obtained by solving the nine simultaneous equations.
- the third calculation unit 94 determines whether or not the x coordinate value i is n (step S33).
- the third calculation unit 94 determines that the x coordinate value i is not n (No in Step S33), it sets i + 1 as the x coordinate value i (Step S34). And the 3rd calculating part 94 returns to step S32.
- step S35 the third calculation unit 94 determines whether the y coordinate value j is m (step S35).
- step S35 When the third calculation unit 94 determines that the y coordinate value j is not m (No in step S35), j + 1 is set as the y coordinate value j (step S36). And the 3rd calculating part 94 returns to step S32.
- step S35 When the third calculation unit 94 determines that the y coordinate value j is m (Yes in step S35), the third calculation unit 94 ends the process of step S4 in FIG.
- the third calculation unit 94 stores the plurality of correction coefficients calculated in step S32 in the storage unit 95 in association with the plurality of measurement regions 20.
- the two-dimensional colorimetric apparatus 1 can acquire the correction coefficients (correction matrix coefficient A (1, 1) to correction matrix coefficient A (n, m)) for each measurement region 20 of the screen SC.
- a mode color measurement mode for measuring the measurement area 20 using the acquired correction coefficient.
- FIG. 12 is a flowchart illustrating the color measurement mode.
- step S41 the same processing as step S12 shown in FIG.
- the control processing unit 9 instructs the imaging unit 5 to capture a color image. Thereby, the imaging unit 5 captures the entire color image of the screen SC and outputs the color image information signal SG1 (step S42). This is the same processing as step S13 shown in FIG.
- the control processing unit 9 receives the signal SG1 output in step S42.
- the first computing unit 92 computes the photometric amounts RGB of the measurement region 20 for all of the m ⁇ n measurement regions 20 shown in FIG. 8 using the received signal SG1 (step S43). This is the same processing as step S14 shown in FIG.
- the correction unit 96 includes Equation 4, m ⁇ n correction coefficients (correction matrix coefficient A (1, 1) to correction matrix coefficient A (n, m)) stored in advance in the storage unit 95, and step S43.
- the light quantity RGB of each of the m ⁇ n measurement areas 20 are corrected (step S44). For example, in the case of the measurement region 20 located at the coordinates (1, 1), R (1, 1), G (1, 1), B (1, 1), correction matrix coefficient A is corrected for the photometric quantity RGB.
- (1,1) and Equation 4 X (1,1), Y (1,1), and Z (1,1) are obtained.
- the luminance chromaticity calculation unit 97 calculates the luminance and chromaticity for each of the m ⁇ n measurement regions 20 using the result of step S44 (step S45).
- the output unit 11 outputs the luminance and chromaticity calculated in step S45. It is description of the above colorimetric mode.
- the two-dimensional color measurement device 1 uses the tristimulus values XYZ of one measurement region 20 (generally, the central region of the display) in advance. Even if each of the mxn measurement areas 20 is corrected using the calculated correction coefficient, chromaticity and luminance cannot be obtained accurately.
- m ⁇ n correction coefficients that is, correction matrix coefficient A (1, 1) to correction matrix coefficient A ( n, m)
- each of the light measurement amounts RGB in the m ⁇ n correction areas is corrected with a corresponding correction coefficient. For this reason, even when the chromaticity and luminance of the screen SC are uneven, it is possible to accurately correct the light measurement amounts RGB for each of the m ⁇ n measurement regions 20.
- the two-dimensional colorimetric apparatus 1 measures all the m ⁇ n measurement areas 20 shown in FIG. This is a case where the total area of the plurality of measurement regions 20 is the same as the area of the screen SC. It is also possible when the total area of the plurality of measurement regions 20 is smaller than the area of the screen SC. This will be described as a first modification of the present embodiment.
- FIG. 13 is an explanatory diagram illustrating an example of a plurality of measurement regions 20 whose total area is smaller than the area of the screen SC. In FIG. 13, five measurement areas 20-a, 20-b, 20-c, 20-d, and 20-e are shown as the plurality of measurement areas 20. The number of the plurality of measurement regions 20 may be two or more, and is not limited to five.
- the correction coefficient acquisition mode of the first modification will be described. 3 and 13, in the correction coefficient acquisition mode, the operator of the two-dimensional colorimetric apparatus 1 uses the input unit 10 to display each screen SC of the plurality of measurement regions 20-a to 20-e. Input to specify the upper position.
- the coordinates where the measurement region 20-a is located are (ax, ay), the coordinates where the measurement region 20-b is located are (bx, by), and the coordinates where the measurement region 20-c is located are (cx, ay).
- the coordinates where the measurement region 20-d is located are (dx, dy)
- the coordinates where the measurement region 20-e is located are (ex, ey).
- the first calculation unit 92 calculates the photometric amounts RGB for each of the plurality of measurement regions 20-a to 20-e.
- the selection control unit 91 sets the angle of the micromirror 61 located at the coordinates (ax, ay) as the selection angle.
- the optical sensor unit 8 outputs a signal SG2 indicating the photometric amount of the measurement region 20-a located at the coordinates (ax, ay).
- the second calculator 93 calculates the tristimulus values XYZ of the measurement region 20-a located at the coordinates (ax, ay).
- the selection control unit 91 sets the angle of the micromirror 61 located at the coordinates (bx, by) as the selection angle.
- the optical sensor unit 8 outputs a signal SG2 indicating the photometric quantity of the measurement region 20-b located at the coordinates (bx, by).
- the second calculator 93 calculates the tristimulus values XYZ of the measurement region 20-b located at the coordinates (bx, by).
- the third calculation unit 94 uses the above equations 5 to 7 to correct the correction matrix coefficient A (ax, ay), the correction matrix coefficient A (bx, by), and the correction matrix.
- the coefficient A (cx, cy), the correction matrix coefficient A (dx, dy), and the correction matrix coefficient A (ex, ey) are calculated.
- the third calculation unit 94 calculates the value obtained in step S1 in FIG. 9, the value obtained in step S2 in FIG. A (ax, ay) is calculated using the value obtained in step S3 of step 9.
- step S1 in FIG. 9 The values obtained in step S1 in FIG. 9 are Xr (ax, ay), Yr (ax, ay), Zr (ax, ay), Rr (ax, ay), Gr (ax, ay), and Br (ax, ay).
- the values obtained in step S2 of FIG. 9 are Xg (ax, ay), Yg (ax, ay), Zg (ax, ay), Rg (ax, ay), Gg (ax, ay), and Bg (ax, ay).
- step S3 in FIG. 9 The values obtained in step S3 in FIG. 9 are Xb (ax, ay), Yb (ax, ay), Zb (ax, ay), Rb (ax, ay), Gb (ax, ay), and Bb (ax, ay).
- the third arithmetic unit 94 stores the correction matrix coefficient A (ax, ay) in the storage unit 95 in association with the measurement region 20-a, and the correction matrix coefficient A (bx, ay in association with the measurement region 20-b. by) is stored in the storage unit 95, the correction matrix coefficient A (cx, cy) is stored in the storage unit 95 in association with the measurement region 20-c, and the correction matrix coefficient A ( dx, dy) is stored in the storage unit 95, and the correction matrix coefficient A (ex, ey) is stored in the storage unit 95 in association with the measurement region 20-e.
- the correction coefficient acquisition mode of the first modification is summarized as follows.
- the first calculation unit 92 uses the color image information signal SG1 of the screen SC output from the imaging unit 5, and has a plurality of measurement regions 20 having positions designated using the input unit 10. -A to 20-e are calculated, and the selection control unit 91 sequentially turns the light from the plurality of measurement regions 20-a to 20-e at the positions specified by using the input unit 10.
- the second computing unit 93 uses the input unit 10 by using the signal SG2 indicating the photometric quantity of the measurement regions 20-a to 20-e sequentially output from the optical sensor unit 8.
- the tristimulus values XYZ of the plurality of measurement regions 20-a to 20-e at the specified positions are calculated, and the third calculation unit 94 performs a plurality of measurements at the positions specified by the input unit 10.
- a plurality of correction matrix coefficients A (ax, ay) to A (ex, ey) are calculated, and the storage unit 95 calculates a plurality of correction matrix coefficients A (ax, ay) to A (ax, ay) to Each of A (ex, ey) is stored in association with a plurality of measurement regions 20-a to 20-e at positions designated by using the input unit 10.
- Steps S43 to S45 in FIG. 12 are executed for the plurality of measurement regions 20-a to 20-e. That is, in the color measurement mode, the first calculation unit 92 uses the color image information signal SG1 of the screen SC output from the imaging unit 5, and uses a plurality of measurement regions at positions designated using the input unit 10. The light measurement RGB of each of 20-a to 20-e is calculated, and the correction unit 96 performs the above operation on each of the plurality of measurement regions 20-a to 20-e at the position specified using the input unit 10. Perform correction processing.
- the luminance chromaticity calculation unit 97 calculates the luminance and chromaticity for each of the plurality of measurement regions 20-a to 20-e using the result of the correction process.
- a part of the screen SC specified by the operator is used as a plurality of measurement areas 20 instead of the entire screen SC. For this reason, the time required for obtaining the correction coefficient and the time required for color measurement can be shortened.
- a two-dimensional colorimetric apparatus 1 for example, Patent Document 3 including a scanning optical system instead of the DMD 6.
- the processing speed in the correction coefficient acquisition mode and the color measurement mode is about 157000 times that in the comparative example. 157000 ⁇ (1024 ⁇ 768) ⁇ 5
- the exposure time required for one measurement area 20 is, for example, 1/60 seconds.
- the exposure times of the correction coefficient acquisition mode and the colorimetry mode are about 80 msec in the first modified example and about 218 minutes in the comparative example. Therefore, according to the first modification, the exposure time can be significantly shortened. 5 ⁇ 1 / 60sec ⁇ 80msec 1024 x 768 x 1/60 sec ⁇ 218 minutes
- FIG. 14 is a block diagram showing a configuration of a two-dimensional colorimetric apparatus 1a according to the second modification.
- the two-dimensional colorimetric device 1 shown in FIG. 3 includes a mirror unit 3 and a switching unit 4 (first form of the optical system).
- the two-dimensional colorimetric device 1a includes a light dividing unit 3a ( A second form of the optical system).
- the light splitting unit 3a splits the light L from the screen SC into two, guides one of the split light L1 to the first optical path 21, and guides the other split light L2 to the second optical path 22.
- the light splitting unit is, for example, a half mirror.
- the provision of the light splitting unit 3a eliminates the need to switch the mirror unit 3 between the first position and the second position, as shown in FIGS.
- FIG. 15 is a schematic diagram of a multiband optical sensor unit 800.
- the optical sensor unit 800 includes a first photodiode 801a, a second photodiode 801b, a third photodiode 801c, a fourth photodiode 801d, a fifth photodiode 801e, a sixth photodiode 801f, and a first filter. 802a, a second filter 802b, a third filter 802c, a fourth filter 802d, a fifth filter 802e, and a sixth filter 802f.
- the first photodiode 801a receives the light La that has passed through the first filter 802a.
- the second photodiode 801b receives the light La that has passed through the second filter 802b.
- the third photodiode 801c receives the light La that has passed through the third filter 802c.
- the fourth photodiode 801d receives the light La that has passed through the fourth filter 802d.
- the fifth photodiode 801e receives the light La that has passed through the fifth filter 802e.
- the sixth photodiode 801f receives the light La that has passed through the sixth filter 802f.
- the first filter 802a to the sixth filter 802f have spectral sensitivity in different wavelength bands.
- FIG. 16 is an explanatory diagram for explaining the spectral sensitivities of the first filter 802a to the sixth filter 802f.
- the horizontal axis indicates the wavelength
- the vertical axis indicates the spectral sensitivity.
- the first filter 802a has a spectral sensitivity A1 (thick solid line)
- the second filter 802b has a spectral sensitivity A2 (long dotted wavy line)
- the filter 802c has a spectral sensitivity A3 (one-dot chain line)
- the fourth filter 802d has a spectral sensitivity A4 (two-dot chain line)
- the fifth filter 802e has a spectral sensitivity A5 (short dashed line).
- the sixth filter 802f has a spectral sensitivity A6 (thin solid line).
- the first photodiode 801a when the first photodiode 801a receives the light La that has passed through the first filter 802a, the first photodiode 801a outputs a light reception signal in the case of the spectral sensitivity A1.
- the second photodiode 801b When the second photodiode 801b receives the light La that has passed through the second filter 802b, the second photodiode 801b outputs a light reception signal in the case of the spectral sensitivity A2.
- the third photodiode 801c When the third photodiode 801c receives the light La that has passed through the third filter 802c, the third photodiode 801c outputs a light reception signal in the case of the spectral sensitivity A3.
- the fourth photodiode 801d When the fourth photodiode 801d receives the light La that has passed through the fourth filter 802d, the fourth photodiode 801d outputs a light reception signal in the case of the spectral sensitivity A4.
- the fifth photodiode 801e When the fifth photodiode 801e receives the light La that has passed through the fifth filter 802e, the fifth photodiode 801e outputs a light reception signal in the case of the spectral sensitivity A5.
- the sixth photodiode 801f When the sixth photodiode 801f receives the light La that has passed through the sixth filter 802f, the sixth photodiode 801f outputs a light reception signal in the case of the spectral sensitivity A6.
- These light reception signals are sent to the control processing unit 9 as a signal SG2 indicating the light measurement amount of one measurement region 20, as shown in FIG.
- the multiband optical sensor unit 800 includes four or more filters having different spectral sensitivities, and each of the plurality of measurement regions 20 receives light reception signals via the four or more filters. Is output.
- FIG. 17 is a schematic diagram of a spectroscopic optical sensor unit 810.
- the optical sensor unit 810 includes, for example, an imaging optical system 811, a reflective diffraction grating 812, a line sensor 814, a housing 813 that houses the imaging optical system 811, the reflective diffraction grating 812, and the line sensor 814, Is provided.
- the housing 813 is a box formed of a material having a light shielding property with respect to a wavelength range in which the line sensor 814 can receive light.
- An incident opening (for example, a slit) 815 that guides light La into the housing 813 is formed on one side surface of the housing 813.
- the light La incident from the incident aperture 815 enters the imaging optical system 811, is collimated by the imaging optical system 811, enters the reflective diffraction grating 812, and is diffracted by the reflective diffraction grating 812. And reflected.
- the reflected light is incident on the imaging optical system 811 again and is formed on the light receiving surface 816 of the line sensor 814 by the imaging optical system 811 as a wavelength dispersion image of the optical image.
- the line sensor 814 includes a plurality of photoelectric conversion elements arranged along one direction.
- the photoelectric conversion element is, for example, a silicon photodiode (SPD).
- SPD silicon photodiode
- the line sensor 814 generates an electrical signal representing the intensity level of each wavelength by photoelectrically converting the wavelength dispersion image of the optical image formed on the light receiving surface 816 by each of the plurality of photoelectric conversion elements. Then, the line sensor 814 outputs this electric signal (signal SG2) to the control processing unit 9 (FIG. 4).
- the spectroscopic optical sensor unit 810 splits and receives the light from the measurement region 20 for each of the plurality of measurement regions 20, and outputs a light reception signal of each spectrum.
- FIG. 18 is a schematic diagram of an optical sensor unit 820 of the filter rotation type.
- the optical sensor unit 820 includes a filter unit 81 and a photodiode 82 that receives the light La transmitted through the filter unit 81.
- the filter unit 81 includes an X filter 83, a Y filter 84, a Z filter 85, and a disc-shaped holder 86 that holds these filters.
- the spectral sensitivity obtained by combining the spectral sensitivity of the X filter 83 and the spectral sensitivity of the photodiode 82 becomes a spectral sensitivity that matches the color matching function x ( ⁇ ).
- the spectral sensitivity obtained by combining the spectral sensitivity of the Y filter 84 and the spectral sensitivity of the photodiode 82 becomes a spectral sensitivity that matches the color matching function y ( ⁇ ).
- the spectral sensitivity obtained by combining the spectral sensitivity of the Z filter 85 and the spectral sensitivity of the photodiode 82 becomes a spectral sensitivity that matches the color matching function z ( ⁇ ).
- the holder 86 is rotated by a rotation mechanism (not shown), and the positions of the X filter 83, the Y filter 84, and the Z filter 85 can be sequentially switched to positions facing the light receiving surface of the photodiode 82.
- the photodiode 82 faces the X filter 83 and the photodiode 82 receives the light La
- the photodiode 82 outputs a light receiving signal indicating X.
- the photodiode 82 and the Y filter 84 face each other and the photodiode 82 receives the light La
- the photodiode 82 outputs a light reception signal indicating Y.
- the photodiode 82 When the light receiving surface of the photodiode 82 and the Z filter 85 face each other and the photodiode 82 receives the light La, the photodiode 82 outputs a light receiving signal indicating Z. As shown in FIG. 4, these light reception signals are sent to the control processing unit 9 as a signal SG ⁇ b> 2 indicating the light measurement amount of one measurement region 20.
- a two-dimensional sensor, a one-dimensional sensor, a photomultiplier tube, or the like is used as the light receiving element of light La instead of the photodiodes 80a to 80c, 801a to 801f, and 82. Also good.
- the correction coefficient is calculated for each of the plurality of measurement regions 20, but the third modification example calculates the correction coefficient by paying attention to one of the plurality of measurement regions 20.
- DMD 6 light selector
- selects light from a certain measurement region 20 here, measurement region 20-c shown in FIG. 13 as an example
- the optical sensor unit 8 receives light from the measurement region 20-c selected by the DMD 6 and outputs a signal SG2 indicating the photometric quantity.
- the second calculation unit 93 calculates the tristimulus value of the measurement region 20-c using the signal SG2 indicating the light measurement amount of the measurement region 20-c output from the optical sensor unit 8.
- the first calculation unit 92 calculates the tristimulus values of the measurement region 20-c using the color image information signal of the screen SC (two-dimensional region) output from the imaging unit 5. .
- the third calculation unit 94 calculates the tristimulus value of the measurement region 20-c calculated by the first calculation unit 92 and the tristimulus value of the measurement region 20-c calculated by the second calculation unit 93. And a correction coefficient corresponding to the measurement region 20-c is calculated.
- the control processing unit 9 causes the storage unit 95 to store the correction coefficient calculated by the third calculation unit 94 in association with the measurement region 20-c. The above is the correction coefficient acquisition mode of the third modification.
- the first calculation unit 92 calculates the tristimulus values of the measurement region 20-c using the color image information signal of the screen SC output from the imaging unit 5.
- the correction unit 96 corrects this tristimulus value with a correction coefficient read from the storage unit 95 and associated with the measurement region 20-c.
- the operator can designate the measurement area 20-c (a certain measurement area).
- the operator uses the input unit 10 to input the position of the measurement region to be selected by the DMD 6 among the plurality of measurement regions 20 (that is, the measurement region 20-c).
- the DMD 6 selects the measurement region 20-c based on the position input to the input unit 10.
- the two-dimensional colorimetric apparatus is a two-dimensional colorimetric apparatus that measures a plurality of measurement areas included in a two-dimensional area, and the first optical path is an optical path of light from the two-dimensional area.
- an optical system that forms a second optical path, a two-dimensional imaging device, an imaging unit that is arranged in the first optical path and takes a color image of the two-dimensional region, and is arranged in the second optical path
- a light selection unit that selects light from one of the measurement regions out of the light from the two-dimensional region
- a selection control unit that causes the light selection unit to select light from the plurality of measurement regions, It has a function of receiving light from a region having an area less than or equal to the measurement region, receives light from the plurality of measurement regions selected by the light selection unit, and measures the light quantity of each of the plurality of measurement regions
- An optical sensor unit that outputs a signal indicating
- a first calculation unit that calculates tristimulus values of each of the plurality of measurement regions using the color image information signal of the two-dimensional region, and a plurality of the measurement regions output from the optical sensor unit.
- a second calculation unit that calculates each tristimulus value of each of the plurality of measurement regions using a signal indicating a photometric quantity, and a tristimulus value calculated by the first calculation unit for one measurement region And a process of calculating a correction coefficient of one measurement region using the tristimulus values calculated by the second calculation unit is a correction coefficient calculation process, and the correction is performed for each of the plurality of measurement regions.
- a third calculation unit that performs coefficient calculation processing.
- a plurality of correction coefficients corresponding to each of a plurality of measurement regions included in the two-dimensional region can be obtained. Therefore, even when the chromaticity and luminance of light from the two-dimensional region are uneven, the tristimulus values can be accurately corrected for each of the plurality of measurement regions.
- a mode setting unit that selectively sets a correction coefficient acquisition mode for acquiring a plurality of correction coefficients in advance and a colorimetry mode for measuring a plurality of the measurement regions using the plurality of correction coefficients;
- a storage unit and in the correction coefficient acquisition mode, the first calculation unit uses a color image information signal of the two-dimensional region output from the imaging unit to output a plurality of measurement regions.
- Each tristimulus value is calculated, and the second calculation unit uses a signal indicating the photometric quantity of the plurality of measurement regions output from the optical sensor unit, and uses each of the three stimulations of the plurality of measurement regions.
- a value is calculated, the third calculation unit performs the correction coefficient calculation process for each of the plurality of measurement regions, and the storage unit calculates the plurality of correction coefficients calculated by the third calculation unit. It's Les, in association with each stored with a plurality of the measurement region.
- This configuration calculates a plurality of correction coefficients corresponding to each of the plurality of measurement areas in the correction coefficient acquisition mode, and stores each of the calculated plurality of correction coefficients in association with the plurality of measurement areas. Therefore, a plurality of correction coefficients can be acquired in advance.
- the first calculation unit uses the color image information signal of the two-dimensional region output from the imaging unit in the colorimetry mode, and calculates each tristimulus value of the plurality of measurement regions.
- the two-dimensional colorimetric device calculates the tristimulus values calculated by the first calculation unit in the colorimetry mode for one measurement region, and associates the tristimulus values with the one measurement region.
- a correction unit that performs the correction process for each of the plurality of measurement regions in the colorimetry mode.
- This configuration uses a plurality of correction coefficients acquired in advance, and each tristimulus value of each of a plurality of measurement regions (these tristimulus values are obtained using a color image information signal of a two-dimensional region output from the imaging unit). To be corrected).
- a mode setting unit that selectively sets a correction coefficient acquisition mode for acquiring a plurality of correction coefficients in advance and a colorimetry mode for measuring a plurality of the measurement regions using the plurality of correction coefficients;
- the operator of the two-dimensional colorimetric device determines the position on the two-dimensional region of each of the plurality of measurement regions whose total area is smaller than the area of the two-dimensional region.
- An input unit for inputting, and in the correction coefficient acquisition mode uses the color image information signal of the two-dimensional region output from the imaging unit, A tristimulus value of each of the plurality of measurement regions at a position specified using the input unit is calculated, and the selection controller is configured to determine whether the plurality of measurement regions at the position specified using the input unit
- the light selecting unit selects the light
- the second calculation unit specifies using the input unit using signals indicating the photometric amounts of the plurality of measurement regions output from the optical sensor unit.
- the third calculation unit Calculating the tristimulus values of each of the plurality of measurement regions at the specified position, the third calculation unit, for each of the plurality of measurement regions at the position specified using the input unit, Correction coefficient calculation processing is performed, and the storage unit associates each of the plurality of correction coefficients calculated by the third calculation unit with a plurality of measurement regions at positions designated using the input unit. Then remember.
- This configuration makes a part of the 2D area specified by the operator a plurality of measurement areas instead of the entire 2D area. For this reason, the time required for obtaining the correction coefficient can be shortened.
- the first calculation unit is located at a position specified by using the input unit using the color image information signal of the two-dimensional region output from the imaging unit in the color measurement mode.
- the tristimulus values of each of the plurality of measurement regions are calculated, and the two-dimensional colorimetry apparatus calculates the tristimulus values calculated by the first calculation unit in the colorimetry mode for one measurement region, Correction processing is performed using the correction coefficient stored in the storage unit in association with one measurement area as a correction process, and in the colorimetric mode, a plurality of positions at positions designated using the input unit A correction unit that performs the correction process is further provided for each of the measurement regions.
- This configuration makes a part of the 2D area specified by the operator a plurality of measurement areas instead of the entire 2D area. For this reason, the time required for color measurement can be shortened.
- the optical system has a first form and a second form.
- the first form of the optical system is a mirror section and a position where the mirror section can reflect light from the two-dimensional area, and the light from the two-dimensional area is reflected to the first optical path and the second optical path.
- a first position for guiding the light from the two-dimensional region to a position where the mirror unit cannot reflect the light from the two-dimensional region, and the light from the two-dimensional region to the other of the first optical path and the second optical path And a switching unit that switches the position of the mirror unit to the second position to be guided.
- the second form of the optical system divides the light from the two-dimensional region into two parts, guides the one of the two divided lights to the first optical path, and sends the other divided light to the second light.
- the mirror unit In the first form of the optical system, the mirror unit is switched between the first position and the second position. However, in the second form of the optical system, since the light dividing unit is provided, it is not necessary to switch between them. It becomes.
- the light selection unit has a first form and a second form.
- the first form of the light selection unit includes a DMD.
- the second form of the light selector includes a liquid crystal spatial light modulator.
- the optical sensor unit has a first form to a third form.
- the first form of the optical sensor unit has a spectral sensitivity that matches the CIE-specified color matching functions x ( ⁇ ), y ( ⁇ ), and z ( ⁇ ), and each of the plurality of measurement regions has an XYZ table.
- a light reception signal indicating X of the tristimulus values XYZ of the color system, a light reception signal indicating Y, and a light reception signal indicating Z are output.
- the second form of the optical sensor unit includes four or more filters having different spectral sensitivities, and outputs a light reception signal received through each of the four or more filters for each of the plurality of measurement regions.
- the light from the measurement region is spectrally received for each of the plurality of measurement regions, and a light reception signal of each spectrum is output.
- the selection control unit causes the light selection unit to select light from a plurality of the measurement regions in a predetermined order.
- a two-dimensional colorimetric device can be provided.
Abstract
Description
Y(i,j) = ∫y(λ)*E(i,j,λ)dλ = ∫Sm(λ)*Fy(λ)*E(i,j,λ)dλ
Z(i,j) = ∫z(λ)*E(i,j,λ)dλ = ∫Sm(λ)*Fz(λ)*E(i,j,λ)dλ
・・・式1
Y(i,j) = ∫y(λ)*E(i,j,λ)dλ = A(i,j) ∫Sm(λ)*Fy(λ)*E(i,j,λ)dλ
Z(i,j) = ∫z(λ)*E(i,j,λ)dλ ∫Sm(λ)*Fz(λ)*E(i,j,λ)dλ
・・・式2
Y(i,j) = ∫y(λ)*E(i,j,λ)dλ = A(i,j) ∫Sm(λ)*Fg(λ)*E(i,j,λ)dλ
Z(i,j) = ∫z(λ)*E(i,j,λ)dλ ∫Sm(λ)*Fb(λ)*E(i,j,λ)dλ
・・・式3
Y(i,j) = A(i,j) G(i,j) ・・・式4
Z(i,j) B(i,j)
輝度Y=Y
色度x=X/(X+Y+Z)
色度y=Y/(X+Y+Z)
Yr(i,j) = A(i,j) Gr(i,j) ・・・式5
Zr(i,j) Br(i,j)
Yg(i,j) = A(i,j) Gg(i,j) ・・・式6
Zg(i,j) Bg(i,j)
Yb(i,j) = A(i,j) Gb(i,j) ・・・式7
Zb(i,j) Bb(i,j)
157000≒(1024×768)÷5
5×1/60sec≒80msec
1024×768×1/60sec≒218分
本実施形態に係る二次元測色装置は、二次元領域に含まれる複数の測定領域を測色する二次元測色装置であって、前記二次元領域からの光の光路として、第1の光路と第2の光路とを形成する光学系と、二次元撮像素子を含み、前記第1の光路に配置され、前記二次元領域のカラー画像を撮影する撮像部と、前記第2の光路に配置され、前記二次元領域からの光のうち、一つの前記測定領域からの光を選択する光選択部と、複数の前記測定領域からの光を、前記光選択部に選択させる選択制御部と、前記測定領域以下の面積を有する領域からの光を受光する機能を有し、前記光選択部によって選択された複数の前記測定領域からの光を受光し、複数の前記測定領域のそれぞれの測光量を示す信号を出力する光学センサ部と、前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算する第1の演算部と、前記光学センサ部から出力された複数の前記測定領域の測光量を示す信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算する第2の演算部と、一つの前記測定領域について、前記第1の演算部によって演算された三刺激値と、前記第2の演算部によって演算された三刺激値とを用いて、一つの前記測定領域の補正係数を演算する処理を補正係数演算処理とし、複数の前記測定領域のそれぞれについて、前記補正係数演算処理をする第3の演算部と、を備える。
Claims (16)
- 二次元領域に含まれる複数の測定領域を測色する二次元測色装置であって、
前記二次元領域からの光の光路として、第1の光路と第2の光路とを形成する光学系と、
二次元撮像素子を含み、前記第1の光路に配置され、前記二次元領域のカラー画像を撮影する撮像部と、
前記第2の光路に配置され、前記二次元領域からの光のうち、一つの前記測定領域からの光を選択する光選択部と、
複数の前記測定領域からの光を、前記光選択部に選択させる選択制御部と、
前記測定領域以下の面積を有する領域からの光を受光する機能を有し、前記光選択部によって選択された複数の前記測定領域からの光を受光し、複数の前記測定領域のそれぞれの測光量を示す信号を出力する光学センサ部と、
前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算する第1の演算部と、
前記光学センサ部から出力された複数の前記測定領域の測光量を示す信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算する第2の演算部と、
一つの前記測定領域について、前記第1の演算部によって演算された三刺激値と、前記第2の演算部によって演算された三刺激値とを用いて、一つの前記測定領域の補正係数を演算する処理を補正係数演算処理とし、複数の前記測定領域のそれぞれについて、前記補正係数演算処理をする第3の演算部と、を備える二次元測色装置。 - 複数の前記補正係数を予め取得する補正係数取得モードと、複数の前記補正係数を用いて複数の前記測定領域を測色する測色モードとを選択的に設定するモード設定部と、
記憶部と、をさらに備え、
前記補正係数取得モードにおいて、前記第1の演算部は、前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算し、前記第2の演算部は、前記光学センサ部から出力された複数の前記測定領域の測光量を示す信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算し、前記第3の演算部は、複数の前記測定領域のそれぞれについて、前記補正係数演算処理をし、前記記憶部は、前記第3の演算部によって演算された複数の前記補正係数のそれぞれを、複数の前記測定領域と対応づけて記憶する請求項1に記載の二次元測色装置。 - 前記測色モードにおいて、前記第1の演算部は、前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、複数の前記測定領域のそれぞれの三刺激値を演算し、
前記二次元測色装置は、一つの前記測定領域について、前記測色モードで前記第1の演算部によって演算された三刺激値を、一つの前記測定領域に対応づけて前記記憶部に記憶されている前記補正係数を用いて補正する処理を補正処理とし、前記測色モードにおいて、複数の前記測定領域のそれぞれについて、前記補正処理をする補正部をさらに備える請求項2に記載の二次元測色装置。 - 複数の前記補正係数を予め取得する補正係数取得モードと、複数の前記補正係数を用いて複数の前記測定領域を測色する測色モードとを選択的に設定するモード設定部と、
記憶部と、
前記補正係数取得モードにおいて、合計面積が前記二次元領域の面積より小さい複数の前記測定領域のそれぞれの前記二次元領域上の位置を、前記二次元測色装置の操作者が指定する入力がされる入力部と、をさらに備え、
前記補正係数取得モードにおいて、前記第1の演算部は、前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、前記入力部を用いて指定された位置にある複数の前記測定領域のそれぞれの三刺激値を演算し、前記選択制御部は、前記入力部を用いて指定された位置にある複数の前記測定領域からの光を、前記光選択部に選択させ、前記第2の演算部は、前記光学センサ部から出力された複数の前記測定領域の測光量を示す信号を用いて、前記入力部を用いて指定された位置にある複数の前記測定領域のそれぞれの三刺激値を演算し、前記第3の演算部は、前記入力部を用いて指定された位置にある複数の前記測定領域のそれぞれについて、前記補正係数演算処理をし、前記記憶部は、前記第3の演算部によって演算された複数の前記補正係数のそれぞれを、前記入力部を用いて指定された位置にある複数の前記測定領域と対応づけて記憶する請求項1に記載の二次元測色装置。 - 前記測色モードにおいて、前記第1の演算部は、前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、前記入力部を用いて指定された位置にある複数の前記測定領域のそれぞれの三刺激値を演算し、
前記二次元測色装置は、一つの前記測定領域について、前記測色モードで前記第1の演算部によって演算された三刺激値を、一つの前記測定領域に対応づけて前記記憶部に記憶されている前記補正係数を用いて補正する処理を補正処理とし、前記測色モードにおいて、前記入力部を用いて指定された位置にある複数の前記測定領域のそれぞれについて、前記補正処理をする補正部をさらに備える請求項4に記載の二次元測色装置。 - 前記光学系は、
ミラー部と、
前記二次元領域からの光を前記ミラー部が反射できる位置であり、前記二次元領域からの光を前記第1の光路及び前記第2の光路の一方に導く第1の位置と、前記二次元領域からの光を前記ミラー部が反射できない位置であり、前記二次元領域からの光を前記第1の光路及び前記第2の光路の他方に導く第2の位置とに、前記ミラー部の位置を切り替える切替部と、を含む請求項1~5のいずれか一項に記載の二次元測色装置。 - 前記光学系は、前記二次元領域からの光を二分割し、前記二分割された一方の光を前記第1の光路に導き、前記二分割された他方の光を前記第2の光路に導く光分割部を含む請求項1~5のいずれか一項に記載の二次元測色装置。
- 前記光選択部は、DMDを含む請求項1~7のいずれか一項に記載の二次元測色装置。
- 前記光選択部は、液晶空間光変調器を含む請求項1~7のいずれか一項に記載の二次元測色装置。
- 前記光学センサ部は、CIE規定の等色関数x(λ),y(λ),z(λ)と一致する分光感度を有し、複数の前記測定領域のそれぞれについて、XYZ表色系の三刺激値XYZのXを示す受光信号、Yを示す受光信号、及び、Zを示す受光信号を出力する請求項1~9のいずれか一項に記載の二次元測色装置。
- 前記光学センサ部は、分光感度が互いに異なる4以上のフィルタを含み、複数の前記測定領域のそれぞれについて、前記4以上のフィルタのそれぞれを介して受光した受光信号を出力する請求項1~9のいずれか一項に記載の二次元測色装置。
- 前記光学センサ部は、複数の前記測定領域のそれぞれについて、前記測定領域からの光を分光して受光し、各分光の受光信号を出力する請求項1~9のいずれか一項に記載の二次元測色装置。
- 前記選択制御部は、複数の前記測定領域からの光を、予め定められた順番で前記光選択部に選択させる請求項1~12のいずれか一項に記載の二次元測色装置。
- 二次元領域に含まれる複数の測定領域を測色する二次元測色装置であって、
前記二次元領域のカラー画像を撮像する撮像部と、
前記複数の測定領域のうち、ある測定領域からの光を選択する光選択部と、
前記光選択部によって選択された前記測定領域からの光を受光し測光量を示す信号を出力する光学センサ部と、
前記撮像部から出力された前記二次元領域のカラー画像情報信号を用いて、前記測定領域の三刺激値を演算する第1の演算部と、
前記光学センサ部から出力された前記測定領域の測光量を示す信号を用いて、前記測定領域の三刺激値を演算する第2の演算部と、
前記第1の演算部によって演算された三刺激値と、前記第2の演算部によって演算された三刺激値とを用いて、前記測定領域に対応する補正係数を演算する第3の演算部と、を備える二次元測色装置。 - 前記第3の演算部で演算された補正係数を前記測定領域に対応づけて記憶する記憶部と、
前記第1の演算部で演算された、前記測定領域の三刺激値を、前記記憶部から読み出した、前記測定領域に対応づけた補正係数で補正する補正部をさらに備える請求項14に記載の二次元測色装置。 - 前記複数の測定領域のうち、前記光選択部によって選択されるべき前記測定領域の位置を操作者が入力する入力部をさらに備え、
前記入力部に入力された位置に基づいて前記光選択部が前記測定領域を選択する請求項14又は15に記載の二次元測色装置。
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JP7309640B2 (ja) | 2020-03-18 | 2023-07-18 | 株式会社東芝 | 光学検査装置 |
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CN108780009B (zh) | 2020-08-25 |
JP6341335B2 (ja) | 2018-06-13 |
JPWO2017164134A1 (ja) | 2018-04-05 |
KR102056554B1 (ko) | 2019-12-16 |
CN108780009A (zh) | 2018-11-09 |
KR20180104058A (ko) | 2018-09-19 |
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