WO2020054209A1

WO2020054209A1 - Two-dimensional flicker measurement device, two-dimensional flicker measurement method, and two-dimensional flicker measurement program

Info

Publication number: WO2020054209A1
Application number: PCT/JP2019/027847
Authority: WO
Inventors: 智寛村田; 増田　敏
Original assignee: コニカミノルタ株式会社
Priority date: 2018-09-13
Filing date: 2019-07-16
Publication date: 2020-03-19
Also published as: JP7189515B2; JPWO2020054209A1

Abstract

This two-dimensional flicker measurement device is provided with: a two-dimensional imaging element; a calculation unit for calculating, on the basis of a photometric quantity obtained by imaging a device under test (DUT screen) by the two-dimensional imaging element, a flicker value of each of multiple measurement regions set on the device under test; and a correction part for correcting the flicker value of the each of the respective multiple measurement regions to an equivalent flicker value obtained when each of the multiple measurement regions is measured at a predetermined angle and direction.

Description

Two-dimensional flicker measurement device, two-dimensional flicker measurement method, and two-dimensional flicker measurement program

<< The present invention relates to a technique for measuring a flicker value of a screen of a liquid crystal display, for example.

As a flicker measuring device, there are a spot type flicker measuring device and a two-dimensional flicker measuring device. The spot-type flicker measurement device includes a probe, and measures a flicker value of the measurement region while the probe is close to the measurement region (spot region) (for example, Patent Document 1). The two-dimensional flicker measurement device includes a two-dimensional image sensor, and measures a flicker value in a two-dimensional area (for example, Patent Document 2).

(4) In order to evaluate the flicker unevenness occurring on the display screen, flicker values of a plurality of measurement areas set on the display screen are measured. According to the two-dimensional flicker measuring device, it is possible to measure the flicker value of the two-dimensional region, so that one flicker measuring device can measure each flicker value of a plurality of measuring regions at once. .

The two-dimensional flicker measuring device measures a flicker value in a two-dimensional area. For this reason, the angle and direction of the measurement area viewed from the two-dimensional flicker measurement device differ depending on the position of the measurement area. The present inventor has found that, in the case of a liquid crystal display screen, if the angle is different, the flicker value is different, and if the direction is different even at the same angle (for example, a left 45 ° angle and a right 45 ° angle), the flicker value is changed. I found something different. The present inventor believes that the alignment is caused by the orientation of the liquid crystal arranged in the liquid crystal display.

角度 The angle and direction of the measurement area viewed from the two-dimensional flicker measurement device differ depending on the position of the measurement area. As a result, there is a difference between the flicker unevenness based on the flicker value measured by the two-dimensional flicker measuring device and the flicker unevenness felt by a human looking at the screen of the liquid crystal display. The details will be described below.

For example, in the case of large and medium-sized liquid crystal displays, the position at which a person looks at the liquid crystal display screen is relatively far from the liquid crystal display screen. On the other hand, when the flicker value of the screen of the liquid crystal display is measured using the two-dimensional flicker measuring device, the distance between the screen of the liquid crystal display and the two-dimensional flicker measuring device is relatively short. If the distance is relatively large, the following disadvantages occur. Since the screen of the liquid crystal display photographed by the two-dimensional image sensor of the two-dimensional flicker measuring device becomes smaller, the number of measurement areas that can be set on this screen becomes smaller (decrease in measurement resolution). In addition, since the area required for measuring the flicker value of the screen of the liquid crystal display increases, the degree of freedom of the layout of the facility is reduced in the facility where the flicker value is measured.

As described above, the distance between the position where a person looks at the screen of the liquid crystal display and the screen of the liquid crystal display may be significantly different from the distance between the two-dimensional flicker measuring device and the screen of the liquid crystal display. In this case, the respective angles and directions of the plurality of measurement regions viewed from the two-dimensional flicker measurement device are different from the respective angles and directions of the plurality of measurement regions viewed from the position where the human looks at the screen of the liquid crystal display. . As a result, there is a difference between the flicker unevenness based on the flicker value measured by the two-dimensional flicker measuring device and the flicker unevenness that a person feels when looking at the screen of the liquid crystal display.

Since the size of a mobile liquid crystal display is small, the screens of a plurality of liquid crystal displays are arranged and the flicker value is measured collectively. The screen of the liquid crystal display, which is not arranged near the optical axis of the two-dimensional flicker measuring device, among the screens of the plurality of liquid crystal displays arranged in an oblique direction is viewed from the two-dimensional flicker measuring device. For this reason, with respect to the screen of these liquid crystal displays, the flicker value is measured from an angle and a direction different from the angle and the direction at which a person looks at the screen of the liquid crystal display. As a result, with respect to the screens of these liquid crystal displays, the flicker unevenness based on the flicker value measured by the two-dimensional flicker measuring device and the flicker unevenness felt when a human is looking at the screen of the liquid crystal display. Differences occur.

Although the screen of the liquid crystal display has been described as an example, the same problem occurs if the measurement target has a property in which the flicker value of the measurement region has a different property according to the angle and direction of the measurement region viewed from the two-dimensional flicker measurement device. .

JP-A-2002-350284 JP 2005-109535 A

The present invention relates to a two-dimensional flicker measurement device capable of measuring flicker values of a plurality of measurement regions set on a measurement target in consideration of an angle and a direction of a measurement region viewed from the two-dimensional flicker measurement device. It is an object to provide a two-dimensional flicker measurement method and a two-dimensional flicker measurement program.

In order to achieve the above-described object, a two-dimensional flicker measurement device according to one aspect of the present invention includes a two-dimensional image sensor, a calculation unit, and a correction unit. The calculation unit is configured to measure each of a plurality of measurement areas set in the measurement target based on a light measurement amount of the measurement target obtained by capturing the measurement target by the two-dimensional imaging device. Is calculated. The correction unit corrects the flicker value of each of the plurality of measurement regions to the flicker value corresponding to a case where each of the plurality of measurement regions is measured from a predetermined angle and direction.

Advantages and features provided by one or more embodiments of the invention will be more fully understood from the detailed description given below and the accompanying drawings. These detailed descriptions and accompanying drawings are provided by way of example only and are not intended as limiting definitions of the present invention.

FIG. 2 is a diagram showing a relationship between a liquid crystal color display (DUT) having a screen to be measured and a two-dimensional flicker measuring device. It is a schematic diagram of a plane of a DUT screen in which a plurality of measurement areas are set. FIG. 1 is a block diagram illustrating a configuration of a two-dimensional flicker measurement device according to an embodiment and a PC that can communicate with the measurement device. FIG. 9 is an explanatory diagram illustrating an example of a table. FIG. 4 is a schematic diagram of a state in which a DUT screen is viewed from a two-dimensional flicker measurement device. It is the first half of the flowchart explaining the 1st generation method of a table. It is the latter half of the flowchart explaining the 1st generation method of a table. FIG. 9 is an explanatory diagram illustrating an initial state of a setting screen. FIG. 9 is an explanatory diagram illustrating a setting screen after a model name and respective positions of a plurality of measurement areas B are input. FIG. 7 is an explanatory diagram illustrating a setting screen including measurement results of a horizontal angle and a vertical angle. FIG. 11 is an explanatory diagram illustrating a setting screen after a horizontal angle and a vertical angle for which a flicker value is to be measured are input. FIG. 9 is a schematic diagram showing a state where a flicker value is measured from a horizontal angle of 0 ° and a vertical angle of 0 ° (an example of a predetermined angle and direction) in a measurement area B-1. FIG. 9 is an explanatory diagram illustrating a setting screen in a state where a flicker value has been input. FIG. 13 is an explanatory diagram illustrating a setting screen switched by operating a next key included in the setting screen illustrated in FIG. 12. FIG. 14 is an explanatory diagram illustrating a setting screen in which a flicker value has been input in the measurement area column illustrated in FIG. 13. FIG. 9 is an explanatory diagram illustrating a setting screen including a table. It is the first half of the flowchart explaining the 2nd generation method of a table. It is the latter half of the flowchart explaining the 2nd generation method of a table. FIG. 7 is an explanatory diagram illustrating a setting screen including measurement results of a horizontal angle and a vertical angle. FIG. 9 is a schematic diagram showing a state where a flicker value is measured by changing a horizontal angle and a vertical angle in a measurement area B-8 (measurement area C). FIG. 9 is an explanatory diagram illustrating a setting screen in a state where a flicker value has been input. FIG. 20 is an explanatory diagram illustrating a setting screen switched by operating a next key included in the setting screen illustrated in FIG. 19. FIG. 21 is an explanatory diagram illustrating a setting screen displayed when the horizontal angle and the vertical angle input in the angle column do not match any of the 15 combinations of the horizontal angle and the vertical angle included in the measurement region column illustrated in FIG. is there. FIG. 9 is an explanatory diagram illustrating a setting screen including a table. 5 is a flowchart illustrating an operation in which the two-dimensional flicker measuring device according to the embodiment measures flicker using a table. It is a schematic diagram of the some smart phone arranged side by side for the measurement of a flicker value.

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.

において In each drawing, configurations denoted by the same reference numerals indicate the same configurations, and descriptions of the configurations that have already been described will be omitted. In the present specification, when referring to individual components, they are indicated by reference numerals with hyphens (for example, the measurement area 10-1), and when they are collectively referred to, reference numerals without hyphens (for example, the measurement area 10) are used. Show.

FIG. 1 is a diagram showing a relationship between a liquid crystal color display (DUT = Device \ Under \ Test) having a screen 1 to be measured and a two-dimensional flicker measuring device 3. The measurement target has a function of displaying an image. In the embodiment, a description will be given of a DUT screen 1 (hereinafter, DUT screen 1) as an example. The object to be measured is not limited to the screen of the liquid crystal display, but also includes, for example, a projection screen and a projection screen of a liquid crystal projector.

(2) The two-dimensional flicker measurement device 3 sets a plurality of measurement areas on the DUT screen 1 based on the instruction of the measurer, and simultaneously measures flicker values for the plurality of measurement areas. FIG. 2 is a schematic plan view of the DUT screen 1 on which a plurality of measurement areas 10 are set. On the DUT screen 1, fifteen measurement areas 10-1 to 10-15 are set two-dimensionally. The number of the measurement areas 10 set on the DUT screen 1 may be a plurality, and is not limited to fifteen. Although no gap is formed between adjacent measurement areas 10, a gap may be formed. The shape of the measurement region 10 is rectangular, but is not limited thereto, and may be circular.

FIG. 3 is a block diagram showing the respective configurations of the two-dimensional flicker measurement device 3 according to the embodiment and a PC (Personal Computer) 5 that can communicate with the measurement device. The two-dimensional flicker measurement device 3 includes an optical lens 31, a two-dimensional image sensor 32, an arithmetic processing unit 33, an operation unit 34, and a communication unit 35. The optical lens 31 converges light L from the entire DUT screen 1. The light L converged by the optical lens 31 is received by the two-dimensional image sensor 32.

The two-dimensional image sensor 32 is an image sensor having a two-dimensional imaging area (for example, a CMOS sensor or a CCD sensor). The two-dimensional image sensor 32 shoots the DUT screen 1 displaying an image at a set frame rate, and outputs a luminance signal SG of the shot image. The luminance signal SG is a specific example of a signal indicating the light intensity measurement.

Luminance is the light intensity of the DUT screen 1 measured by the two-dimensional image sensor 32 having the spectral sensitivity characteristic of the visibility curve V (λ). The luminance signal SG is a signal indicating the light intensity. Although the description will be made using the luminance signal SG as an example, an image information signal may be used. The image information signal is a light intensity signal (RAW image data) generated by the two-dimensional imaging device 32 when the two-dimensional imaging device 32 having an arbitrary spectral sensitivity characteristic photographs the DUT screen 1. The photometric light quantity is a physical quantity that generically refers to the luminance and the image information signal.

The calculation processing unit 33 is a hardware processor that executes various calculations and processes necessary for measuring the flicker value. The arithmetic processing unit 33 is realized by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a HDD (Hard Disk Drive), and the like. The arithmetic processing unit 33 includes a calculation unit 331, a correction unit 332, and a storage unit 333 as functional blocks.

Referring to FIGS. 2 and 3, calculation unit 331 determines a plurality of values set in DUT screen 1 based on the measured light amounts of DUT screen 1 obtained by two-dimensional image sensor 32 capturing DUT screen 1. The flicker value of each of the measurement areas 10 (in FIG. 2, the measurement areas 10-1 to 10-15) is calculated. As a method for calculating the flicker value, there are a contrast method and a JEITA (Japan Electronics and Information Information Technology Industries Association) method. The calculation unit 331 can calculate the flicker value by either the contrast method or the JEITA method.

The correction unit 332 corrects each flicker value of the plurality of measurement regions 10 to a flicker value corresponding to a case where each of the plurality of measurement regions 10 is measured from a predetermined angle and direction. The predetermined angle and direction will be described with reference to FIG. The predetermined angle and direction are determined based on, for example, the normal line of the DUT screen 1. When the optical axis AX of the two-dimensional flicker measuring device 3 is set to an angle and a direction defined by a horizontal angle of 0 degrees and a vertical angle of 0 degrees, the optical axis AX and the normal line coincide. The predetermined angle and direction may be, for example, the same as or substantially the same as the angle and direction of the measurement region 10 as viewed from the position where the person views the DUT screen 1. The term “substantially the same” refers to the flicker unevenness based on the flicker value measured by the two-dimensional flicker measuring device 3 and the flicker unevenness felt when a person looks at the DUT screen 1 from the position where the DUT screen 1 is viewed. It means the degree of no difference.

記憶 Referring to FIGS. 2 and 3, storage unit 333 stores table 334 in advance. The table 334 includes a plurality of correction coefficients assigned to each of the plurality of measurement regions 10. The table 334 converts the flicker value of each of the plurality of measurement regions 10 calculated by the calculation unit 331 into a flicker value corresponding to a case where each of the plurality of measurement regions 10 is subjected to photometry from a predetermined angle and direction. Used for The correction unit 332 performs correction using the table 334.

FIG. 4 is an explanatory diagram illustrating an example of the table 334. Angles and directions are defined by horizontal and vertical angles. The table 334 stores the values of the horizontal angle and the vertical angle of the measurement areas 10-1 to 10-15 (FIG. 2) viewed from the two-dimensional flicker measurement device 3. The horizontal angle and the vertical angle at the center of the measurement area 10-1 are the horizontal angle and the vertical angle of the measurement area 10-1. The same applies to the measurement areas 10-2 to 10-15. The table 334 stores correction coefficients assigned to each of the measurement areas 10-1 to 10-15.

When the angle and the direction are defined by the horizontal angle and the vertical angle, the horizontal angle and the vertical angle can be measured by the same method as that by which the surveying instrument measures the horizontal angle and the vertical angle. In this case, the two-dimensional flicker measuring device 3 has the same function as that of the surveying instrument for measuring the horizontal angle and the vertical angle, and measures the horizontal angle and the vertical angle using this function.

Angle and direction can be defined by the surveying instrument using a method different from the method of measuring the horizontal angle and the vertical angle. This example will be described. FIG. 5 is a schematic diagram showing a state in which the DUT screen 1 is viewed from the two-dimensional flicker measurement device 3. For example, the angle of view range of the two-dimensional image sensor 32 is divided into a case where the angle of view is less than 10 degrees, a case where it is 10 degrees or more and less than 20 degrees, a case where it is 20 degrees or more and less than 30 degrees, and a case where it is 30 degrees or more and less than 40 degrees. A table indicating the correspondence between the coordinates of the effective pixel area of the two-dimensional image sensor 32 and the angle of view range is stored in the storage unit 333 in advance.

The arithmetic processing unit 33 converts the coordinates of the center of the measurement area 10-1 on the DUT screen 1 into coordinates on the effective pixel area of the two-dimensional image sensor 32. The transformed coordinates (hereinafter referred to as transformed coordinates) indicate the direction of the measurement area 10-1. The arithmetic processing unit 33 specifies the angle of view range to which the transformed coordinates belong with reference to the table. The specified angle-of-view range indicates the angle of the measurement area 10-1. The same applies to the measurement areas 10-2 to 10-15.

参照 Referring to FIG. 3, operation unit 34 is realized by a touch panel, hard keys, and the like. The operation unit 34 is used for focusing the optical lens 31, setting the frame rate of the two-dimensional image sensor 32, inputting a flicker value measurement command, and the like. The operation unit 34 performs an operation of selecting a mode for correcting a flicker value and a mode for not correcting a flicker value. When the mode for correcting the flicker value is selected, the correction unit 332 corrects the flicker value of each of the plurality of measurement regions 10 calculated by the calculation unit 331. When the mode in which the flicker value is not corrected is selected, the correction unit 332 does not correct the flicker values of the plurality of measurement regions 10 calculated by the calculation unit 331.

The communication unit 35 is a communication interface through which the two-dimensional flicker measurement device 3 communicates with the external PC 5.

The PC 5 includes a communication unit 51, an arithmetic processing unit 52, an input unit 53, and a display unit 54.

The communication unit 51 is a communication interface with which the PC 5 communicates with the external two-dimensional flicker measurement device 3.

The operation processing unit 52 is a hardware processor that executes various operations and processes for realizing the functions of the PC 5. The arithmetic processing unit 52 is realized by a CPU, a RAM, a ROM, an HDD, and the like. The arithmetic processing unit 52 includes a setting unit 521, a generation unit 522, and a storage unit 523 as functional blocks.

The setting unit 521 performs various settings (for example, designation of the center position of the measurement area 10 and the number of the measurement areas 10) necessary for measuring the flicker value. The generation unit 522 generates the table 334. The storage unit 523 stores information (horizontal angle, vertical angle, flicker value, and the like) necessary for generating the table 334.

The input unit 53 is a device that inputs commands, data, information, and the like to the PC 5, and is realized by a keyboard, a mouse, and the like. The display unit 54 functions as an output unit of the PC 5, and is realized by a liquid crystal display or the like.

Note that some or all of the functions of the

arithmetic processing units

33 and 52 may be realized by processing by an FPGA (field programmable gate array) instead of or together with processing by the CPU. Similarly, some or all of the functions of the

arithmetic processing units

33 and 52 may be realized by processing by a dedicated hardware circuit instead of or together with processing by software.

The arithmetic processing unit 33 includes a plurality of elements shown in FIG. Therefore, a program for realizing these elements is stored in the HDD, which is hardware for realizing the arithmetic processing unit 33. That is, the HDD stores programs for realizing each of the calculation unit 331 and the correction unit 332. These programs are expressed as a calculation program and a correction program.

{Similarly, the arithmetic processing unit 52 is constituted by a plurality of elements shown in FIG. Therefore, a program for realizing these elements is stored in the HDD, which is hardware for realizing the arithmetic processing unit 52. That is, a program for realizing each of the setting unit 521 and the generation unit 522 is stored in the HDD. These programs are referred to as a setting program and a generation program.

These programs are expressed using element definitions. The calculation unit 331 and the calculation program will be described as examples. The calculation unit 331 is configured to calculate each of the plurality of measurement regions 10 set on the measurement target based on the measured light amounts of the measurement target obtained by the two-dimensional imaging device 32 capturing the measurement target. Calculate the flicker value. The calculation program calculates the flicker of each of the plurality of measurement areas 10 set on the measurement target based on the measured light intensity of the measurement target obtained by imaging the measurement target with the two-dimensional image sensor 32. This is a program that calculates the value.

The flowcharts of these programs (calculation program, correction program, setting program, generation program) executed by the CPU that is the hardware that realizes the

arithmetic processing units

33 and 52 will be described later with reference to FIGS. 6A, 6B, and 16A. 16B and FIG.

A method for generating the table 334 will be described. FIG. 6A is the first half of a flowchart illustrating a first generation method of the table 334. FIG. 6B is the latter half of the flowchart for explaining the first generation method of the table 334. With reference to FIG. 2, when the DUT screen 1 is set at the flicker measurement position, the optical axis AX is located at the center of the DUT screen 1, and the two-dimensional flicker measurement device 3 can photograph the entire DUT screen 1. Is set to the position.

および Referring to FIGS. 3 and 6A, the measurer operates input unit 53 to input a command to generate table 334 to PC 5. Thereby, the arithmetic processing unit 52 activates the generation program of the table 334, and causes the display unit 54 to display the setting screen 60 shown in FIG. 7 (Step S1). FIG. 7 is an explanatory diagram illustrating an initial state of the setting screen 60. The setting screen 60 includes a character area 600, a model name field 601, a measurement area field 602, and a next key 603.

In the text area 600 of the setting screen 60 shown in FIG. 7, "Please input the model name of the DUT and the flicker measurement area. Of the DUTs of the input model name, one out of the DUTs for which flicker is measured this time. Please select one and set it to the flicker measurement position. "Is displayed. The screen of the DUT set at the measurement position (DUT screen 1) becomes the screen of a DUT of the same model as this DUT (DUT screen A).

Referring to FIGS. 3, 6A and 7, the measurer inputs the model name of the DUT to be measured for flicker into model type field 601 using input unit 53, and enters a plurality of model names into measurement area field 602. The respective positions of the measurement area B are input (step S2). A plurality of measurement areas B are set on the DUT screen A.

FIG. 8 is an explanatory diagram illustrating the setting screen 60 after the model name and the respective positions of the plurality of measurement areas B have been input. In the model name column 601, “XXX” is input as a model name. The setting unit 521 sets a plurality of measurement areas B on the DUT screen A according to the input position, and displays the set plurality of measurement areas B in the measurement area column 602 shown in FIG. The number of the measurement areas B is set to 15. In the measurement area column 602, measurement areas B-1 to B-15 set on the DUT screen A are displayed. The number and position of the measurement areas B are the same as the number and position of the measurement areas 10 (FIG. 2) set on the DUT screen 1. Note that these may be different. If they are different, the generation unit 522 obtains a required flicker value by interpolating the flicker values of the plurality of measurement areas B.

(4) The measurer operates the next key 603 included in the setting screen 60 shown in FIG. According to this operation, the generation unit 522 instructs the two-dimensional flicker measurement device 3 to measure the horizontal angle and the vertical angle of each of the measurement areas B-1 to B-15 set on the DUT screen A ( Step S3). The communication unit 51 transmits this command to the communication unit 35.

(4) When the communication unit 35 receives the command, the two-dimensional flicker measurement device 3 measures the horizontal angle and the vertical angle of each of the measurement areas B-1 to B-15 (step T1). The arithmetic processing unit 33 instructs the communication unit 35 to transmit the measurement results of the horizontal angle and the vertical angle. The communication unit 35 transmits these measurement results to the communication unit 51 (Step T2).

When the communication unit 51 receives the measurement result, the arithmetic processing unit 52 causes the display unit 54 to display the setting screen 60 shown in FIG. 9 (step S4). FIG. 9 is an explanatory diagram illustrating the setting screen 60 including the measurement results of the horizontal angle and the vertical angle. The measurement area column 602 shows the horizontal angle and the vertical angle of each of the measurement areas B-1 to B-15.

「“ Enter the horizontal and vertical angles for which you want to measure flicker values ”is displayed in the character area 600 of the setting screen 60 shown in FIG. The horizontal angle and the vertical angle for which the flicker value is to be measured mean predetermined angles and directions. An angle field 604 is added to the setting screen 60. The measurer operates the input unit 53 to input a horizontal angle and a vertical angle (predetermined angle and direction) for which the flicker value is to be measured in the angle column 604 (step S5). For example, assume that a horizontal angle of 0 degrees and a vertical angle of 0 degrees are input.

(5) The measurer operates the next key 603 included in the setting screen 60 shown in FIG. The arithmetic processing unit 52 displays the setting screen 60 shown in FIG. 10 on the display unit 54 (Step S6). FIG. 10 is an explanatory diagram illustrating the setting screen 60 after the horizontal angle and the vertical angle for which the flicker value is to be measured are input. In the measurement area column 602, a horizontal angle of 0 degree and a vertical angle of 0 degree are displayed for each of the measurement areas B-1 to B-15, and the flicker value is blank. In the character area 600, "Please measure the flicker value at a horizontal angle of 0 degree and a vertical angle of 0 degree for each measurement area. Then, enter the measured flicker value." Is done.

FIG. 11 is a schematic diagram showing a state where the flicker value is measured from the horizontal angle of 0 ° and the vertical angle of 0 ° (an example of a predetermined angle and direction) in the measurement area B-1. First, the measurer operates the operation unit 34 (FIG. 3) to set a mode in which the flicker value is not corrected. Then, the measurer sets the two-dimensional flicker measuring device 3 at a position where the measurement area B-1 has a horizontal angle of 0 ° and a vertical angle of 0 ° as viewed from the two-dimensional flicker measuring device 3. The measurer measures the flicker value of the measurement area B-1 using the two-dimensional flicker measurement device 3. In this measurement, since the correction unit 332 is not used, the measured flicker value is the flicker value calculated by the calculation unit 331 (the flicker value before correction). Assume that the measured flicker value is F-1.

Next, the measurer sets the two-dimensional flicker measuring device 3 at a position where the measurement area B-2 has a horizontal angle of 0 ° and a vertical angle of 0 ° when viewed from the two-dimensional flicker measuring device 3. The flicker value of the measurement area B-2 is measured in the same manner as the measurement of the flicker value of the measurement area B-1. Assume that the measured flicker value is F-2. Flicker values are similarly measured for the measurement areas B-3 to B-15.

As described above, the flicker values F-1 to F-15 (the flicker values before correction) measured at the horizontal angle of 0 degree and the vertical angle of 0 degree are measured for each of the measurement areas B-1 to B-15. Is done. The flicker values F-1 to F-15 are determined by a predetermined angle and direction for each of a plurality of measurement areas B set on a measurement object A (DUT screen A) of the same model as the measurement object (DUT screen 1). Is a flicker value measured from. Note that, instead of the two-dimensional flicker measuring device 3, a spot type flicker measuring device is used to measure the flicker value of each of the measurement areas B-1 to B-15 under a horizontal angle of 0 degree and a vertical angle of 0 degree. May be measured.

測定 Referring to FIGS. 3, 6A and 10, the measurer determines whether or not flicker values F-1 to F-15 are normal. If it is abnormal, it cannot be used as the basis of the table 334, so the measurer starts over from step S1. When the measurer determines that the flicker values F-1 to F-15 are normal, the operator uses the input unit 53 to enter the flicker values F-1 to F-15 in the flicker value column included in the measurement area column 602. Input (step S7). FIG. 12 is an explanatory diagram illustrating the setting screen 60 in a state where the flicker value has been input. The arithmetic processing unit 52 causes the storage unit 523 to store information included in the model name column 601, the measurement region column 602, and the angle column 604 shown in FIG. The storage unit 523 stores such information. The measurer operates the next key 603 included in the setting screen 60 shown in FIG.

演算 Referring to FIGS. 3 and 6B, arithmetic processing unit 52 causes display unit 54 to display setting screen 60 shown in FIG. 13 (step S8). FIG. 13 is an explanatory diagram illustrating the setting screen 60 switched by operating the next key 603 included in the setting screen 60 illustrated in FIG. The measurement area column 602 includes a flicker value input column in addition to the contents of the measurement area column 602 shown in FIG. In the character area 600, "Please set the two-dimensional flicker measurement device 3 to the original position and measure the flicker value before correction of each measurement region using the two-dimensional flicker measurement device 3" is displayed. You. When the DUT screen A is set at the flicker measurement position, the optical axis AX is located at the center of the DUT screen A, and the two-dimensional flicker is set at a position where the entire DUT screen A can be photographed. The measuring device 3 is set (for example, the position shown in FIG. 2).

(4) Using the input unit 53, the measurer inputs a command to measure the uncorrected flicker value of each of the measurement areas B-1 to B-15 (step S9). The communication unit 51 transmits this command to the communication unit 35.

(4) When the communication unit 35 receives the command, the two-dimensional flicker measurement device 3 measures the uncorrected flicker value of each of the measurement areas B-1 to B-15 (step T3). The uncorrected flicker value of each of the measurement areas B-1 to B-15 is obtained as follows. The position of the two-dimensional flicker measurement device 3 is the original position. That is, the position is the same as the position where the flicker value of each of the measurement areas 10-1 to 10-15 set on the DUT screen 1 is measured. In this state, the two-dimensional image sensor 32 captures an image of the DUT screen A, and the calculating unit 331 determines the measurement area B-1 based on the light intensity of the DUT screen A obtained by capturing the DUT screen A. The flicker value of each of B15 to B-15 is calculated. Assume that the calculated flicker values are f-1 to f-15. These flicker values are the pre-correction flicker values of the measurement areas B-1 to B-15. That is, when the flicker value of each of the measurement areas 10-1 to 10-15 set on the DUT screen 1 is measured, the two-dimensional flicker measurement device 3 is moved from the position where the two-dimensional flicker measurement device 3 is installed. These are the flicker values of the measurement areas B-1 to B-15 before correction, which are obtained by using this method.

The arithmetic processing unit 33 instructs the communication unit 35 to transmit the measurement results of the flicker value before correction (flicker values f-1 to f-15). The communication unit 35 transmits the measurement result of the flicker value before correction to the communication unit 51 (step T4).

When the communication unit 51 receives the measurement result, the arithmetic processing unit 52 causes the display unit 54 to display a setting screen 60 including the received measurement result, as shown in FIG. 14 (step S10). FIG. 14 is an explanatory diagram illustrating the setting screen 60 in which the flicker value has been input to the measurement area column 602 shown in FIG. Flicker values f-1 to f-15 are displayed in the respective flicker value columns of the measurement areas B-1 to B-15. The arithmetic processing unit 52 causes the storage unit 523 to store information included in the model name column 601, the measurement region column 602, and the angle column 604 shown in FIG. The storage unit 523 stores such information.

(4) The measurer operates the next key 603 of the setting screen 60 shown in FIG. Accordingly, the generation unit 522 determines the measurement areas 10-1 to 10-15 based on the flicker values F-1 to F-15 shown in FIG. 12 and the flicker values f-1 to f-15 shown in FIG. The respective correction coefficients of FIG. 2 are calculated, and a table 334 (FIG. 4) is generated (step S11). The measurement areas 10-1 to 10-15 correspond to the measurement areas B-1 to B-15, respectively. For the same measurement region B, a value obtained by reducing the flicker value F shown in FIG. 12 by the flicker value f shown in FIG. 14 is a correction coefficient assigned to the measurement region 10 corresponding to the measurement region B. A description will be given taking the measurement area B-1 as an example. Flicker value F-1 / flicker value f-1 is a correction coefficient assigned to measurement area 10-1.

After the generation unit 522 generates the table 334, the calculation processing unit 52 causes the display unit 54 to display the setting screen 60 shown in FIG. 15 (step S12). FIG. 15 is an explanatory diagram illustrating the setting screen 60 including the table 334. The setting screen 60 includes an enter key 605 instead of the next key 603. In the character area 600, "Please check the contents of the table. If there is no problem, operate the enter key." Is displayed.

(4) The measurer operates the input unit 53 to operate the enter key 605. In accordance with this operation, the generation unit 522 sends to the two-dimensional flicker measurement device 3 a table 334 in which the model name input in the model name field 601 and the angle input in the angle field 604 are linked. do. Furthermore, the generation unit 522 causes the storage unit 523 to store the table 334 to which these are linked (Step S13).

The communication unit 51 transmits a table 334 in which a model name and an angle are linked to the communication unit 35 in accordance with the instruction.

When the communication unit 35 receives the table 334 in which the model name and the angle are linked, the arithmetic processing unit 33 causes the storage unit 333 to store the table 334 in which the model name and the angle are linked (step T5).

The above is the first generation method of the table 334. A second generation method of the table 334 will be described. FIG. 16A is the first half of a flowchart illustrating the second generation method of table 334. FIG. 16B is the latter half of the flowchart for explaining the second generation method of the table 334. Steps S1 to S3 and steps T1 and T2 are the same as those in FIG. 6A, and thus description thereof is omitted.

(4) When the communication unit 51 receives the measurement results of the horizontal angle and the vertical angle, the arithmetic processing unit 52 displays the setting screen 60 shown in FIG. 17 on the display unit 54 (Step S21). FIG. 17 is an explanatory diagram illustrating a setting screen 60 including the measurement results of the horizontal angle and the vertical angle. The measurement area column 602 displays the measurement results of the horizontal angle and the vertical angle for each of the measurement areas B-1 to B-15, and the flicker value is blank. The number of combinations of the horizontal angle and the vertical angle is 15 (plural).

In the text area 600 of the setting screen 60 shown in FIG. 17, “One measurement area (measurement area C) is selected from the measurement areas B-1 to B-15, and the measurement is performed on the selected measurement area C. Measure the flicker value for all combinations of the horizontal angle and the vertical angle (angle and direction) shown in the area column 602. The measurement results are transferred to the measurement areas B-1 to B-15 shown in the measurement area column 602. Please input in the field of flicker value corresponding to each of "."

Here, it is assumed that a measurement area B-8 defined by a horizontal angle of 0 degrees and a vertical angle of 0 degrees is selected as the measurement area C. FIG. 18 is a schematic diagram showing a state where the flicker value is measured for the measurement area B-8 (measurement area C) while changing the horizontal angle and the vertical angle. First, the measurer operates the operation unit 34 (FIG. 3) to set a mode in which the flicker value is not corrected. Then, as viewed from the two-dimensional flicker measurement device 3, the measurer places the two-dimensional flicker at a position where the measurement area B-8 has a horizontal angle of -60 degrees and a vertical angle of +40 degrees (corresponding to the position of the measurement area B-1). The flicker measuring device 3 is set. The measurer measures the flicker value of the measurement area B-8 using the two-dimensional flicker measurement device 3. In this measurement, since the correction unit 332 is not used, the measured flicker value is the flicker value calculated by the calculation unit 331 (the flicker value before correction). Assume that the measured flicker value is f-1.

Next, as viewed from the two-dimensional flicker measurement device 3, the measurer positions the measurement area B-8 at a position where the horizontal angle is −40 degrees and the vertical angle is +40 degrees (corresponding to the position of the measurement area B-2). The dimension flicker measuring device 3 is set. The measurer measures the flicker value of the measurement area B-8 using the two-dimensional flicker measurement device 3. The measured flicker value is assumed to be f-2. Flicker values are measured for the remaining combinations of the horizontal angle and the vertical angle in the same manner. Assume that the measured flicker value is f-3 to f-15.

The flicker values f-1 to f-15 are a plurality of flicker values measured in a predetermined measurement area C under a plurality of combinations of angles and directions. Note that these flicker values may be measured using a spot-type flicker measuring device instead of the two-dimensional flicker measuring device 3.

A plurality of combinations of the horizontal angle and the vertical angle (angle and direction) correspond to the horizontal angle and the vertical angle (angle and direction) of the measurement areas 10-1 to 10-15 set on the DUT screen 1 (FIG. 2). Although the description has been given of the case where they match, they do not have to match. If they do not match, the generation unit 522 determines that the flicker values among the flicker values measured from the horizontal angle and the vertical angle (angle and direction) of each of the measurement areas B-1 to B-15 set on the DUT screen A are sufficient. For the horizontal and vertical angles that do not exist, the flicker value is obtained by interpolation.

(4) The measurer determines whether the flicker values f-1 to f-15 are normal. If it is abnormal, it cannot be used as the basis of the table 334, so the measurer starts over from step S1. When the measurer determines that the flicker values f-1 to f-15 are normal, the input unit 53 is used to enter the flicker values f-1 to f-15 in the flicker value column included in the measurement area column 602 shown in FIG. f-15 is input (step S22). FIG. 19 is an explanatory diagram illustrating the setting screen 60 in a state where the flicker value has been input. The measurer operates the next key 603 included in the setting screen 60 shown in FIG.

According to this operation, the arithmetic processing unit 52 causes the display unit 54 to display the setting screen 60 shown in FIG. 20 (step S23). FIG. 20 is an explanatory diagram illustrating the setting screen 60 switched by operating the next key 603 included in the setting screen 60 illustrated in FIG. An angle field 604 is added to the setting screen 60. In the character area 600, "Please input the horizontal angle and the vertical angle for which you want to measure the flicker value" is displayed. The horizontal angle and the vertical angle for which the flicker value is to be measured mean predetermined angles and directions.

Referring to FIG. 3, FIG. 16B and FIG. 20, the measurer operates input unit 53 to input a horizontal angle and a vertical angle (predetermined angle and direction) for which flicker value is to be measured in angle field 604. (Step S24). For example, assume that a horizontal angle of 0 degrees and a vertical angle of 0 degrees are input. In this case, the flicker value f-8 of the measurement area B-8 is equal to the flicker value measured from a predetermined angle and direction for a predetermined measurement area C set on the measurement object A of the same model as the measurement object. Become. The arithmetic processing unit 52 causes the storage unit 523 to store information included in the model name column 601, the measurement region column 602, and the angle column 604 shown in FIG. The storage unit 523 stores such information.

(4) The measurer operates the input unit 53 to operate the next key 603. According to this operation, the generation unit 522 matches the horizontal angle and the vertical angle input in the angle column 604 with any one of the 15 combinations of the horizontal angle and the vertical angle included in the measurement area column 602 shown in FIG. It is determined whether or not (step S25).

Since the horizontal angle of 0 degrees and the vertical angle of 0 degrees are input in the angle column 604, the generating unit 522 determines that the horizontal angle and the vertical angle input in the angle column 604 match any one of the 15 combinations. Is determined (Yes in step S25). Then, the generation unit 522 generates the table 334 (Step S27). This will be described later.

For example, when a horizontal angle of 0 degrees and a vertical angle of +20 degrees are input in the angle column 604, the generating unit 522 determines that the horizontal angle and the vertical angle input in the angle column 604 do not match any of the fifteen combinations. (No in step S25). Then, the arithmetic processing unit 52 causes the display unit 54 to display the setting screen 60 shown in FIG. 21 (Step S26). FIG. 21 is a setting screen displayed when the horizontal angle and the vertical angle input in the angle column 604 do not match any of the 15 combinations of the horizontal angle and the vertical angle included in the measurement area column 602 shown in FIG. FIG. A blank column for inputting a flicker value is added to the angle column 604. In the character area 600, "Please measure the flicker value for the selected measurement area (measurement area B-8 = measurement area C) under the horizontal angle and the vertical angle at which you want to measure the flicker value." Is displayed.

(4) The measurer operates the operation unit 34 to set the mode in which the flicker value is not corrected. Then, the measurer sets the two-dimensional flicker measuring device 3 at a position where the measurement area B-8 has a horizontal angle of 0 degrees and a vertical angle of +20 degrees as viewed from the two-dimensional flicker measuring device 3. The measurer measures the flicker value of the measurement area B-8 using the two-dimensional flicker measurement device 3. In this measurement, since the correction unit 332 is not used, the measured flicker value is the flicker value calculated by the calculation unit 331 (the flicker value before correction). Assume that the measured flicker value is f-0. Using the input unit 53, the measurer inputs the flicker value f-0 into the blank column of the item of flicker value included in the angle column 604. The arithmetic processing unit 52 causes the storage unit 523 to store information included in the model name column 601, the measurement region column 602, and the angle column 604 shown in FIG. The storage unit 523 stores such information. Then, a key 603 is operated. Thereby, the generation unit 522 generates the table 334 (Step S27).

Note that the generating unit 522 determines that the horizontal angle and the vertical angle input in the angle column 604 do not match any of the 15 (plural) combinations of the horizontal angle and the vertical angle included in the measurement region column 602 shown in FIG. (No in step S25), the flicker value may be calculated using interpolation. explain in detail. The generation unit 522 interpolates the horizontal angle, the vertical angle, and the 15 (plural) combinations of the flicker values shown in the measurement area column 602 shown in FIG. Calculate the flicker value measured under the vertical angle. As described above, according to the second generation method of the table 334, even if the horizontal angle and the vertical angle for which the flicker value is to be measured are changed, it is possible to cope with the change by interpolation.

The generation of the table 334 will be described by taking as an example a case where the determination is Yes in step S25. The generation unit 522 calculates the respective correction coefficients of the measurement areas 10-1 to 10-15 (FIG. 2) based on the flicker values f-1 to f-15 and the flicker value f-8 shown in FIG. Then, a table 334 is generated. The measurement areas 10-1 to 10-15 correspond to the measurement areas B-1 to B-15, respectively. Each of the flicker values f-1 to f-15 is used as a numerator, and the value obtained by using the flicker value f-8 as a denominator is a correction coefficient. A description will be given taking the measurement area B-1 as an example. The flicker value f−8 / the flicker value f−1 is a correction coefficient assigned to the measurement area 10-1. When No is determined in step S25, the generation unit 522 generates the table 334 by using the flicker value f-0 instead of the flicker value f-8.

After the generation unit 522 generates the table 334, the calculation processing unit 52 causes the display unit 54 to display the setting screen 60 shown in FIG. 22 (step S28). FIG. 22 is an explanatory diagram illustrating the setting screen 60 including the table 334. This table 334 corresponds to the case where the horizontal angle and the vertical angle for which the flicker value is to be measured are each 0 degree (the case where it is determined Yes in step S25). The setting screen 60 includes an enter key 605 instead of the next key 603. In the character area 600, "Please check the contents of the table. If there is no problem, operate the enter key." Is displayed.

(4) The measurer operates the input unit 53 to operate the enter key 605. The subsequent steps S13 and T5) are the same as steps S13 and T5 shown in FIG. 6B. The above is the second generation method of the table 334.

The table 334 is generated in advance for each DUT model and stored in the storage unit 333. The table 334 is used for measuring the flicker of the current time and measuring the flicker of the DUT of the same model after the current time.

Next, an operation in which the two-dimensional flicker measuring device 3 according to the embodiment measures flicker using the table 334 will be described. FIG. 23 is a flowchart for explaining this. Referring to FIGS. 2, 3 and 23, a DUT screen 1 to be measured is set at a flicker measurement position. The measurer operates the operation unit 34 to set a mode for correcting the flicker value (step T31).

In addition, for example, in the case of a liquid crystal display for a PC, a mode in which the flicker value is not corrected is set. In the case of a liquid crystal display for a PC, the distance between the position where a person looks at the screen of the liquid crystal display and the screen of the liquid crystal display is relatively short, and is equal to the distance between the two-dimensional flicker measuring device 3 and the liquid crystal display screen. In this case, when the flicker value is corrected, on the contrary, the flicker unevenness based on the flicker value measured by the two-dimensional flicker measuring device 3 and the flicker unevenness felt when a human is looking at the screen of the liquid crystal display. And a difference occurs. Therefore, in such a case, the flicker measurer operates the operation unit 34 to set a mode in which the flicker value is not corrected.

(4) The measurer operates the operation unit 34 to give a command to measure the flicker value. The arithmetic processing unit 33 causes the two-dimensional image sensor 32 to photograph the DUT screen 1 at a predetermined frame rate according to the instruction (step T32). As a result, the luminance signal SG indicating the luminance of each pixel of the DUT screen 1 output from the two-dimensional image sensor 32 is input to the arithmetic processing unit 33.

The calculation unit 331 calculates the flicker value of each of the measurement areas 10-1 to 10-15 set on the DUT screen 1 based on the luminance signal SG (an example of the light measurement amount) input to the arithmetic processing unit 33. Is calculated (step T33).

The correction unit 332 corrects the flicker value of each of the measurement areas 10-1 to 10-15 using the table 334 allocated to the DUT screen 1 (step T34). The arithmetic processing unit 33 displays the corrected flicker value of each of the measurement areas 10-1 to 10-15 on the display of the operation unit 34 (step T35).

モバイル Since mobile liquid crystal displays are small, a plurality of liquid crystal displays are arranged and the flicker value is measured at a time. This will be described using a liquid crystal display for a smartphone as an example. FIG. 24 is a schematic diagram of a plurality of smartphones SP arranged side by side for measuring a flicker value. A plurality of smartphones SP are arranged in a matrix within a shooting range R of a two-dimensional image sensor 32 provided in the two-dimensional flicker measurement device 3. A plurality of measurement areas (not shown) are set for each liquid crystal display screen (DUT screen 1) of the plurality of smartphones SP, or one measurement area (not shown) is set at the center of the screen. .

(Summary of Embodiment)
The two-dimensional flicker measurement device according to the first aspect of the embodiment, based on a two-dimensional image sensor, based on the light intensity of the measurement object obtained by imaging the measurement object by the two-dimensional image sensor, the A calculating unit that calculates a flicker value of each of the plurality of measurement regions set in the measurement target; and the flicker value of each of the plurality of measurement regions, the plurality of measurement regions from a predetermined angle and direction. And a correction unit that corrects the flicker value corresponding to a case where each of the photometric values is measured.

The measured light quantity (brightness) is a physical quantity that generically refers to the luminance and the image information signal. The luminance is the light intensity of the measurement object measured by the two-dimensional imaging device having the spectral sensitivity characteristic of the visibility curve V (λ). The image information signal is a light intensity signal (RAW image data) generated by the two-dimensional imaging device when the two-dimensional imaging device having an arbitrary spectral sensitivity characteristic captures an image of the measurement target.

The predetermined angle and direction are determined based on, for example, the normal to the surface of the measurement target. When the optical axis of the two-dimensional flicker measuring device is set to an angle and a direction defined by a horizontal angle of 0 ° and a vertical angle of 0 °, the optical axis and the normal line coincide. The predetermined angle and direction may be, for example, the same as or substantially the same as the angle and direction of the measurement region viewed from the position where the person views the measurement target. Approximately the same is the difference between the flicker unevenness based on the flicker value measured by the two-dimensional flicker measurement device and the flicker unevenness felt when a person is looking at the measurement target from the position where the user views the measurement target. Does not occur.

The correction unit corrects the flicker value of each of the plurality of measurement areas to a flicker value corresponding to a case where each of the plurality of measurement areas is measured from a predetermined angle and direction. Therefore, according to the two-dimensional flicker measurement device according to the first aspect of the embodiment, in consideration of the angle and direction of the measurement region viewed from the two-dimensional flicker measurement device, a plurality of measurement regions set in the measurement target are considered. Each flicker value can be measured.

In the above configuration, a table for converting the flicker value of each of the plurality of measurement regions into the flicker value corresponding to a case where each of the plurality of measurement regions is measured from the predetermined angle and direction is stored in advance. The storage device further includes a storage unit, and the correction unit performs the correction using the table.

This configuration corrects the flicker value using a table stored in the storage unit in advance. This is an example of a method for correcting a flicker value. As another example, there is a method in which a correction formula is stored in a storage unit in advance, and the correction unit corrects the flicker value using the correction formula.

The above configuration further includes an operation unit capable of performing an operation of selecting whether or not the correction unit corrects the flicker value of each of the plurality of measurement areas calculated by the calculation unit.

For example, in the case of a liquid crystal display for a PC, the distance between the position at which a person looks at the screen of the liquid crystal display and the screen of the liquid crystal display is relatively short, which is equivalent to the distance between the two-dimensional flicker measurement device and the liquid crystal display screen. In this case, when the flicker value is corrected, on the contrary, the flicker unevenness based on the flicker value measured by the two-dimensional flicker measurement device and the flicker felt when a human is looking at the screen of the liquid crystal display for the PC. And a difference is generated. Therefore, in such a case, the measurer operates the operation unit to select not to correct the flicker value.

In the two-dimensional flicker measurement method according to the second aspect of the embodiment, the two-dimensional image sensor is set to the measurement target based on a light measurement amount of the measurement target obtained by photographing the measurement target. A calculating step of calculating a flicker value of each of the plurality of measurement areas, and the flicker value of each of the plurality of measurement areas, wherein each of the plurality of measurement areas is measured from a predetermined angle and direction. And a correction step of correcting to the flicker value corresponding to

The two-dimensional flicker measurement method according to the second aspect of the embodiment defines the two-dimensional flicker measurement device according to the first aspect of the embodiment from the viewpoint of the method, and the two-dimensional flicker measurement according to the first aspect of the embodiment. It has the same function and effect as the device.

In the two-dimensional flicker measurement program according to the third aspect of the embodiment, the two-dimensional image sensor is set in the measurement target based on a light measurement amount of the measurement target obtained by photographing the measurement target. A calculating step of calculating a flicker value of each of the plurality of measurement areas, and the flicker value of each of the plurality of measurement areas, wherein each of the plurality of measurement areas is measured from a predetermined angle and direction. And a correcting step of correcting to the flicker value corresponding to the above.

The two-dimensional flicker measurement program according to the third aspect of the embodiment defines the two-dimensional flicker measurement device according to the first aspect of the embodiment from the viewpoint of the program, and the two-dimensional flicker measurement program according to the first aspect of the embodiment. It has the same function and effect as the device.

In the above configuration, the correcting step calculates the flicker value of each of the plurality of measurement regions, which is calculated by the calculation step, when each of the plurality of measurement regions is measured from the predetermined angle and direction. The correction is performed using a table for converting to the corresponding flicker value.

構成 This configuration corrects the flicker value using a table.

In the above configuration, before the calculation step, the computer is further caused to execute a generation step of generating the table including a plurality of correction coefficients assigned to each of the plurality of measurement regions in advance.

According to this configuration, the user (measurer) of the two-dimensional flicker measurement program can generate a table using the two-dimensional flicker measurement program.

In the above configuration, the generation step includes: setting the measurement target A of the same model as the measurement target; for each of the plurality of measurement regions B, the flicker value measured from the predetermined angle and direction; When the flicker value of each of the plurality of measurement areas is measured, from the position where the two-dimensional flicker measurement device equipped with the two-dimensional imaging device is installed, obtained using the two-dimensional flicker measurement device, The plurality of correction coefficients are calculated based on the pre-correction flicker values of the plurality of measurement areas B.

The contents of the table differ depending on the model of the object to be measured. According to this configuration, it is possible to generate a table corresponding to the model of the measurement target. The measurement object A is the same model as the measurement object, and a plurality of measurement areas B are set. Hereinafter, the measurement object and the measurement object A are separately described, and the plurality of measurement regions and the plurality of measurement regions B are separately described.

数 The number and position of the plurality of measurement regions B set on the measurement target A may be the same as or different from the number and position of the plurality of measurement regions set on the measurement target. If they are different, the generation step obtains a required flicker value by interpolating the flicker values of the plurality of measurement areas B.

フリ The pre-correction flicker value of each of the plurality of measurement areas B is obtained as follows. The position of the two-dimensional flicker measurement device is the same as when measuring the flicker value of each of a plurality of measurement areas set on the measurement target. In this state, the two-dimensional image sensor measures the light of each of the plurality of measurement areas B, and outputs a signal indicating the measured light amount. The calculation unit calculates the flicker value of each of the plurality of measurement areas B based on the signal indicating the light intensity measurement. These flicker values are the flicker values of the plurality of measurement areas B before correction.

The correction coefficient will be described with a specific example. The plurality of measurement areas set on the measurement target are 15 measurement areas 10-1 to 10-15, and the plurality of measurement areas B set on the measurement target A are 15 measurement areas B-1. B-15. The fifteen measurement areas B-1 to B-15 are located at the same positions as the fifteen measurement areas 10-1 to 10-15. For the measurement area B-1, the flicker value measured from a predetermined angle and direction is F-1. It is assumed that the flicker value f-1 before correction of the measurement area B-1 is obtained by using the two-dimensional flicker measuring device. The correction coefficient assigned to the measurement area 10-1 is F-1 / f-1. The correction coefficients assigned to the measurement areas 10-2 to 10-15 are obtained in the same manner.

In the above configuration, the generation step includes: for a predetermined measurement area C set on the measurement target A of the same model as the measurement target, the flicker value measured from the predetermined angle and direction; For the measurement area C, the plurality of correction coefficients are calculated based on the plurality of flicker values measured under a plurality of combinations of angles and directions.

The contents of the table differ depending on the model of the object to be measured. According to this configuration, it is possible to generate a table corresponding to the model of the measurement target.

When the predetermined angle and direction are included in a plurality of combinations of the angle and the direction, the measurement of the flicker value from the predetermined angle and the direction can be omitted for the predetermined measurement region C.

複数 A plurality of combinations of angles and directions may or may not match the respective angles and directions of the plurality of measurement regions set on the measurement target. A description will be given of an example in which the number of a plurality of measurement regions set in the measurement target is fifteen. The former is that the angle and direction of each of the 15 measurement areas set on the measurement object match the 15 combinations of angle and direction. In the latter case, in the generation step, among the flicker values measured from the respective angles and directions of the fifteen measurement areas set in the measurement object, the flicker values of the missing angles and directions are obtained by interpolation. That is, the flicker value of the missing angle and direction is obtained by interpolating the flicker value measured under a plurality of combinations of the angle and direction in the predetermined measurement region C.

The correction coefficient will be described with a specific example. The plurality of measurement areas set on the measurement target are 15 measurement areas 10-1 to 10-15, and the plurality of measurement areas B set on the measurement target A are 15 measurement areas B-1. B-15. The fifteen measurement areas B-1 to B-15 are located at the same positions as the fifteen measurement areas 10-1 to 10-15. For a predetermined measurement area C, the flicker value measured from a predetermined angle and direction is f-0. For a predetermined measurement area C, the flicker value measured from the angle and direction of the measurement area B-1 is f-1. The correction coefficient assigned to the measurement area 10-1 is f-0 / f-1. The correction coefficients assigned to the measurement areas 10-2 to 10-15 are obtained in the same manner.

While the embodiments of the present invention have been shown and described in detail, it has been presented by way of example only and not limitation. The scope of the invention should be construed in accordance with the language of the appended claims.

Japanese Patent Application No. 2018-171560 filed on Sep. 13, 2018, the entire disclosure of which is incorporated herein by reference in its entirety.

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

Claims

A two-dimensional image sensor,
The flicker value of each of a plurality of measurement areas set in the measurement target is calculated based on the light intensity of the measurement target obtained by the two-dimensional imaging device capturing an image of the measurement target. A calculating unit to perform
A correction unit that corrects the flicker value of each of the plurality of measurement areas to the flicker value corresponding to a case where each of the plurality of measurement areas is measured from a predetermined angle and direction. measuring device.
A storage unit that stores in advance a table that converts the flicker value of each of the plurality of measurement regions into the flicker value corresponding to a case where each of the plurality of measurement regions is measured from the predetermined angle and direction. Prepared,
The two-dimensional flicker measurement device according to claim 1, wherein the correction unit performs the correction using the table.
3. The apparatus according to claim 1, further comprising an operation unit configured to perform an operation of selecting whether or not the correction unit performs the correction on the flicker value of each of the plurality of measurement regions calculated by the calculation unit. 4. 2. The two-dimensional flicker measuring device according to 1.
A flicker value is calculated for each of a plurality of measurement areas set on the measurement target based on the measured light intensity of the measurement target obtained by imaging the measurement target with the two-dimensional imaging device. A calculating step;
Correcting the flicker value of each of the plurality of measurement regions to the flicker value corresponding to a case where each of the plurality of measurement regions is measured from a predetermined angle and direction. Measuring method.
A flicker value is calculated for each of a plurality of measurement areas set on the measurement target based on the measured light intensity of the measurement target obtained by imaging the measurement target with the two-dimensional imaging device. A calculating step;
Correcting the flicker value of each of the plurality of measurement regions to the flicker value corresponding to a case where each of the plurality of measurement regions is measured from a predetermined angle and direction. Dimensional flicker measurement program.
The correcting step calculates the flicker value of each of the plurality of measurement areas calculated by the calculation step, and calculates the flicker corresponding to a case where each of the plurality of measurement areas is measured from the predetermined angle and direction. The two-dimensional flicker measurement program according to claim 5, wherein the correction is performed using a table that converts the value into a value.
7. The two-dimensional flicker measurement according to claim 6, further comprising, before the calculation step, causing the computer to further execute a generation step of generating the table including a plurality of correction coefficients assigned to each of the plurality of measurement regions in advance. program.
The generating step includes:
The flicker value measured from the predetermined angle and direction for each of a plurality of measurement areas B set for the measurement target A of the same model as the measurement target,
When the flicker value of each of the plurality of measurement areas is measured, from the position where the two-dimensional flicker measurement device equipped with the two-dimensional imaging device is installed, obtained using the two-dimensional flicker measurement device, The flicker value before the correction of each of the plurality of measurement areas B,
The two-dimensional flicker measurement program according to claim 7, wherein the plurality of correction coefficients are calculated based on:
The generating step includes:
The flicker value measured from the predetermined angle and direction for a predetermined measurement area C set on the measurement target A of the same model as the measurement target,
For the predetermined measurement area C, a plurality of flicker values measured under a plurality of combinations of angles and directions,
The two-dimensional flicker measurement program according to claim 7, wherein the plurality of correction coefficients are calculated based on: