JPWO2020054209A1 - Two-dimensional flicker measuring device, two-dimensional flicker measuring method, and two-dimensional flicker measuring program - Google Patents

Abstract

The two-dimensional flicker measuring device is set as a measurement object based on the two-dimensional image pickup element and the photometric amount of the measurement object obtained by the two-dimensional image pickup element photographing the measurement object (DUT screen). It corresponds to the case where the calculation unit that calculates the flicker value of each of the plurality of measurement areas and the flicker value of each of the plurality of measurement areas are photometrically measured from each of the plurality of measurement areas from a predetermined angle and direction. It is provided with a correction unit for correcting the flicker value.

Description

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

As the flicker measuring device, there are a spot type flicker measuring device and a two-dimensional flicker measuring device. The spot-type flicker measuring device includes a probe, and measures the flicker value in the measuring region in a state where the probe is close to the measuring region (spot region) (for example, Patent Document 1). The two-dimensional flicker measuring device includes a two-dimensional imaging element and measures a flicker value in a two-dimensional region (for example, Patent Document 2).

In order to evaluate the unevenness of flicker generated on the screen of the display, the flicker value of each of the plurality of measurement areas set on the screen of the display is measured. According to the two-dimensional flicker measuring device, the flicker value in the two-dimensional region can be measured, so that one two-dimensional flicker measuring device can measure the flicker value of each of a plurality of measurement regions at once. ..

The two-dimensional flicker measuring device measures the flicker value in the two-dimensional region. Therefore, the angle and direction of the measurement area as seen from the two-dimensional flicker measuring device differ depending on the position of the measurement area. In the case of a liquid crystal display screen, the present inventor has different flicker values if the angles are different, and if the directions are different even at the same angle (for example, an angle of 45 degrees to the left and an angle of 45 degrees to the right), the flicker value is different. I found it different. The present inventor considers that the cause is the orientation of the liquid crystal arranged on the liquid crystal display.

The angle and direction of the measurement area as seen from the two-dimensional flicker measuring 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 that a human feels when looking at the screen of the liquid crystal display. The details will be described below.

For example, in the case of a large-sized or medium-sized liquid crystal display, the distance between the position where a human looks at the screen of the liquid crystal display and the screen of the liquid crystal display is relatively large. On the other hand, when the flicker value of the screen of the liquid crystal display is measured by 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 close. This is because if this distance is relatively long, the following disadvantages will occur. Since the screen of the liquid crystal display captured by the two-dimensional image pickup element of the two-dimensional flicker measuring device becomes small, the number of measurement areas that can be set on this screen is reduced (decrease in measurement resolution). Further, since the area required for measuring the flicker value of the screen of the liquid crystal display becomes large, the degree of freedom in the layout of the equipment is reduced in the facility where the flicker value is measured.

As described above, the distance between the position where a human 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 angles and directions of the plurality of measurement areas as seen from the two-dimensional flicker measuring device and the angles and directions of the plurality of measurement areas as seen from the position where a human looks at the screen of the liquid crystal display are different. .. 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 human feels when looking at the screen of the liquid crystal display.

In the case of a mobile liquid crystal display, since the size is small, the screens of a plurality of liquid crystal displays are arranged side by side, and the flicker value is measured collectively. Of the screens of the plurality of liquid crystal displays arranged side by side, the screen of the liquid crystal display that is not arranged near the optical axis of the two-dimensional flicker measuring device is located obliquely when viewed from the two-dimensional flicker measuring device. Therefore, for the screens of these liquid crystal displays, the flicker value is measured from an angle at which a human looks at the screen of the liquid crystal display, an angle different from the direction, and a direction. As a result, regarding 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 liquid crystal display screen. Makes a difference.

Although the screen of the liquid crystal display has been described as an example, the same problem occurs if the measurement object has a property that the flicker value of the measurement area differs depending on the angle and direction of the measurement area as seen from the two-dimensional flicker measuring device. ..

JP-A-2002-350284 Japanese Unexamined Patent Publication No. 2005-109535

The present invention is a two-dimensional flicker measuring device capable of measuring the flicker value of each of a plurality of measuring areas set on a measurement object in consideration of the angle and direction of the measuring area seen from the two-dimensional flicker measuring device. , A two-dimensional flicker measurement method, and a two-dimensional flicker measurement program.

In order to realize the above-mentioned object, the two-dimensional flicker measuring device reflecting one aspect of the present invention includes a two-dimensional image pickup element, a calculation unit, and a correction unit. The calculation unit is a plurality of measurement regions set for the measurement object, respectively, based on the photometric amount of the measurement object obtained by the two-dimensional image sensor photographing the measurement object. Calculate the flicker value of. The correction unit corrects the flicker value of each of the plurality of measurement regions to the flicker value corresponding to the case where each of the plurality of measurement regions is photometrically measured from a predetermined angle and direction.

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

It is a figure which shows the relationship between the liquid crystal color display (DUT) which has the screen which is the object of measurement, and the two-dimensional flicker measuring apparatus. It is a schematic diagram of the plane of the DUT screen in which a plurality of measurement areas are set. It is a block diagram which shows each structure of the 2D flicker measuring apparatus which concerns on embodiment, and PC which can communicate with this measuring apparatus. It is explanatory drawing explaining an example of a table. It is a schematic diagram of the state which the DUT screen is seen from the two-dimensional flicker measuring device. It is the first half of the flowchart explaining the first generation method of a table. It is the latter half of the flowchart explaining the first method of generating a table. It is explanatory drawing explaining the initial state of a setting screen. It is explanatory drawing explaining the setting screen after the model name and the position of each of a plurality of measurement areas B are input. It is explanatory drawing explaining the setting screen which includes the measurement result of a horizontal angle and a vertical angle. It is explanatory drawing explaining the setting screen after the horizontal angle and the vertical angle which we want to measure a flicker value are input. It is a schematic diagram which shows the state which the flicker value is measured from the horizontal angle 0 degree and the vertical angle 0 degree (an example of a predetermined angle and direction) about the measurement area B-1. It is explanatory drawing explaining the setting screen in the state which the flicker value is input. It is explanatory drawing explaining the setting screen which was switched by operating the next key included in the setting screen shown in FIG. It is explanatory drawing explaining the setting screen in which the flicker value is input in the measurement area column shown in FIG. It is explanatory drawing explaining the setting screen including a table. It is the first half of the flowchart explaining the second generation method of a table. It is the latter half of the flowchart explaining the second generation method of a table. It is explanatory drawing explaining the setting screen which includes the measurement result of a horizontal angle and a vertical angle. It is a schematic diagram which shows the state which the flicker value is measured about the measurement area B-8 (measurement area C) by changing the horizontal angle and the vertical angle. It is explanatory drawing explaining the setting screen in the state which the flicker value is input. It is explanatory drawing explaining the setting screen which was switched by operating the next key included in the setting screen shown in FIG. In the explanatory diagram explaining the setting screen displayed when the horizontal angle and the vertical angle entered in the angle field do not match any of the 15 combinations of the horizontal angle and the vertical angle included in the measurement area field shown in FIG. be. It is explanatory drawing explaining the setting screen including a table. It is a flowchart explaining the operation which the 2D flicker measuring apparatus which concerns on embodiment measures flicker using a table. It is a schematic diagram of a plurality of smartphones arranged side by side for measuring 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.

In each figure, the configurations with the same reference numerals indicate that they are the same configuration, and the description of the configurations already described will be omitted. In the present specification, when referring to an individual configuration, it is indicated by a reference code with a hyphen (for example, measurement area 10-1), and when it is generically referred to, it is indicated by a reference code without a hyphen (for example, measurement area 10). show.

FIG. 1 is a diagram showing a relationship between a liquid crystal color display (DUT = Device Under Test) having a screen 1 as a measurement object and a two-dimensional flicker measuring device 3. The object to be measured has a function of displaying an image, and in the embodiment, the DUT screen 1 (hereinafter referred to as the DUT screen 1) will be described as an example. The object to be measured is not limited to the screen of the liquid crystal display, and other objects include, for example, a projection screen of a liquid crystal projector and a projection screen.

The two-dimensional flicker measuring device 3 sets a plurality of measurement areas on the DUT screen 1 based on the instruction of the measurer, and simultaneously measures the flicker value for the plurality of measurement areas. FIG. 2 is a schematic view of a plane of the DUT screen 1 in which a plurality of measurement areas 10 are set. On the DUT screen 1, 15 measurement areas 10-1 to 10-15 are set in two dimensions. The number of measurement areas 10 set on the DUT screen 1 may be a plurality, and is not limited to 15. Although no gap is formed between the adjacent measurement regions 10, a gap may be formed. The shape of the measurement region 10 is rectangular, but is not limited to this, and may be circular.

FIG. 3 is a block diagram showing the configurations of the two-dimensional flicker measuring device 3 according to the embodiment and the PC (Personal Computer) 5 capable of communicating with the measuring device. The two-dimensional flicker measuring 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 the 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 photographing region (for example, a CMOS sensor or a CCD sensor). The two-dimensional image sensor 32 captures the DUT screen 1 displaying the image at a set frame rate, and outputs the luminance signal SG of the captured image. The luminance signal SG is a specific example of a signal indicating a photometric quantity.

The brightness is the light intensity of the DUT screen 1 measured by the two-dimensional imaging device 32 having the spectral sensitivity characteristic of the luminosity curve V (λ). The luminance signal SG is a signal indicating this light intensity. Although the luminance signal SG will be described as an example, it may be an image information signal. The image information signal is a light intensity signal (RAW image data) generated by the two-dimensional image sensor 32 when the two-dimensional image sensor 32 having an arbitrary spectral sensitivity characteristic captures the DUT screen 1. The photometric quantity is a physical quantity that collectively refers to the luminance and the image information signal.

The arithmetic processing unit 33 is a hardware processor that executes various arithmetics 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), an 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.

With reference to FIGS. 2 and 3, the calculation unit 331 is set on the DUT screen 1 based on the photometric amount of the DUT screen 1 obtained by the two-dimensional image pickup element 32 photographing the DUT screen 1. The flicker value of each of the measurement areas 10 (in the case of FIG. 2, 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 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 the flicker value of each of the plurality of measurement areas 10 to a flicker value corresponding to the case where each of the plurality of measurement areas 10 is photometrically measured from a predetermined angle and direction. A predetermined angle and direction will be described with reference to FIG. The predetermined angle and direction are determined, for example, with reference to the normal of the DUT screen 1. When the optical axis AX of the two-dimensional flicker measuring device 3 is oriented at an angle defined by a horizontal angle of 0 degrees and a vertical angle of 0 degrees, the optical axis AX and the normal line coincide with each other. The predetermined angle and direction may be, for example, the same as or substantially the same as the angle and direction of the measurement area 10 as viewed from the position where a human looks at the DUT screen 1. Approximately the same is the unevenness of flicker based on the flicker value measured by the two-dimensional flicker measuring device 3, and the unevenness of flicker felt when a human is looking at the DUT screen 1 from the position where the person looks at the DUT screen 1. It means the degree to which there is no difference.

With reference to FIGS. 2 and 3, the storage unit 333 stores the table 334 in advance. Table 334 includes a plurality of correction coefficients assigned to each of the plurality of measurement areas 10. Table 334 converts each flicker value of the plurality of measurement areas 10 calculated by the calculation unit 331 into a flicker value corresponding to the case where each of the plurality of measurement areas 10 is photometrically measured from a predetermined angle and direction. Used for The correction unit 332 makes a 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. Table 334 stores the values of the horizontal angle and the vertical angle of the measurement areas 10-1 to 10-15 (FIG. 2) seen from the two-dimensional flicker measuring device 3. The horizontal angle and the vertical angle of the center of the measurement area 10-1 are defined as 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 correction coefficient assigned to each of the measurement areas 10-1 to 10-15 is stored in the table 334.

When the angle and 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 the method used by the surveying instrument to measure the horizontal angle and the vertical angle. In this case, the two-dimensional flicker measuring device 3 has the same function as the surveying instrument measuring the horizontal angle and the vertical angle, and measures the horizontal angle and the vertical angle by using this function.

Angles and directions can also be specified using a method different from the method by which the surveying instrument measures the horizontal and vertical angles. An example of this will be described. FIG. 5 is a schematic view of a state in which the DUT screen 1 is viewed from the two-dimensional flicker measuring device 3. For example, the angle of view range of the two-dimensional image sensor 32 is divided into cases of less than 10 degrees, 10 degrees or more and less than 20 degrees, 20 degrees or more and less than 30 degrees, and 30 degrees or more and less than 40 degrees. A table showing the correspondence between the coordinates of the effective pixel region of the two-dimensional image sensor 32 and the angle of view range is stored in advance in the storage unit 333.

The arithmetic processing unit 33 converts the coordinates of the center of the measurement area 10-1 on the DUT screen 1 into the coordinates on the effective pixel area of the two-dimensional image sensor 32. The converted coordinates (hereinafter referred to as converted coordinates) indicate the direction of the measurement region 10-1. The arithmetic processing unit 33 refers to the table and specifies the angle of view range to which the converted coordinates belong. 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.

With reference to FIG. 3, the operation unit 34 is realized by a touch panel, hard keys, or 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. Further, the operation unit 34 is operated to select a mode for correcting the flicker value and a mode for not correcting the 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 areas 10 calculated by the calculation unit 331. When the mode for not correcting the flicker value is selected, the correction unit 332 does not correct the flicker value of each of the plurality of measurement areas 10 calculated by the calculation unit 331.

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

The arithmetic processing unit 52 is a hardware processor that executes various arithmetic operations and processes for realizing the functions of the PC 5. The arithmetic processing unit 52 is realized by a CPU, RAM, ROM, 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 makes various settings (for example, designation of the center position of the measurement area 10 and the number of 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, etc.) necessary for generating the table 334.

The input unit 53 is a device for inputting commands, data, information, etc. to the PC 5, and is realized by a keyboard, a mouse, or 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.

In addition, a part or all of the functions of the arithmetic processing units 33 and 52 may be realized by the processing by the FPGA (field programmable gate array) instead of the processing by the CPU or together with the processing by the CPU. Similarly, a part or all of the functions of the arithmetic processing units 33 and 52 may be realized by processing by a dedicated hardware circuit in place of or in combination with processing by software.

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

Similarly, the arithmetic processing unit 52 is composed of a plurality of elements shown in FIG. Therefore, the HDD, which is the hardware that realizes the arithmetic processing unit 52, stores a program for realizing these elements. That is, a program for realizing each of the setting unit 521 and the generation unit 522 is stored in this HDD. These programs are expressed as a setting program and a generation program.

These programs are represented using element definitions. The calculation unit 331 and the calculation program will be described as an example. The calculation unit 331 is a plurality of measurement areas 10 set in the measurement object based on the photometric amount of the measurement object obtained by the two-dimensional image sensor 32 photographing the measurement object. Calculate the flicker value. The calculation program is based on the photometric amount of the measurement object obtained by the two-dimensional image pickup element 32 photographing the measurement object, and the flicker of each of the plurality of measurement areas 10 set in the measurement object. It is a program that calculates the value.

The flowcharts of these programs (calculation program, correction program, setting program, generation program) executed by the CPU, which is the hardware that realizes the arithmetic processing units 33 and 52, are shown in FIGS. 6A, 6B, and 16A, which will be described later. 16B and 23.

The method of generating the table 334 will be described. FIG. 6A is the first half of the flowchart illustrating the first method of generating the table 334. FIG. 6B is the latter half of the flowchart illustrating the first method of generating the table 334. With reference to FIG. 2, in the two-dimensional flicker measuring device 3, when the DUT screen 1 is set at the flicker measuring position, the optical axis AX is located at the center of the DUT screen 1 and the entire DUT screen 1 can be photographed. It is set in the position.

With reference to FIGS. 3 and 6A, the measurer operates the input unit 53 to input the generation instruction of the table 334 to the PC 5. As a result, the arithmetic processing unit 52 activates the generation program of the table 334 and displays the setting screen 60 shown in FIG. 7 on the display unit 54 (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 character area 600 of the setting screen 60 shown in FIG. 7, "Enter the model name of the DUT and the measurement area of the flicker. Of the DUTs of the input model names, one of the DUTs for measuring the flicker this time Please select one and set it to the measurement position of the flicker. "Is displayed. The DUT screen (DUT screen 1) set at the measurement position becomes the DUT screen (DUT screen A) of the same model as this DUT.

With reference to FIGS. 3, 6A and 7, the measurer inputs the model name of the DUT to be measured by the flicker in the model name field 601 using the input unit 53, and a plurality of DUTs in the measurement area field 602. Each position of the measurement area B is input (step S2). The plurality of measurement areas B are set on the DUT screen A.

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

The measurer operates the next key 603 included in the setting screen 60 shown in FIG. 8 using the input unit 53. According to this operation, the generation unit 522 gives a command to the two-dimensional flicker measuring device 3 to measure the horizontal angle and the vertical angle 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.

When the communication unit 35 receives the command, the two-dimensional flicker measuring device 3 measures the horizontal angle and the vertical angle of the measurement areas B-1 to B-15, respectively (step T1). The arithmetic processing unit 33 gives an instruction to 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 a setting screen 60 including measurement results of a horizontal angle and a vertical angle. In the measurement area column 602, the horizontal angle and the vertical angle of each of the measurement areas B-1 to B-15 are shown.

In the character area 600 of the setting screen 60 shown in FIG. 9, "Enter 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 a predetermined angle and direction. An angle field 604 is added to the setting screen 60. The measurer operates the input unit 53 to input the horizontal angle and the vertical angle (predetermined angle and direction) for which the flicker value is to be measured into the angle field 604 (step S5). For example, it is assumed that a horizontal angle of 0 degrees and a vertical angle of 0 degrees are input.

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

FIG. 11 is a schematic view showing a state in which the flicker value is measured from a horizontal angle of 0 degrees and a vertical angle of 0 degrees (an example of a predetermined angle and direction) for the measurement area B-1. First, the measurer operates the operation unit 34 (FIG. 3) 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-1 has a horizontal angle of 0 degrees and a vertical angle of 0 degrees when viewed from the two-dimensional flicker measuring device 3. The measurer measures the flicker value in the measurement area B-1 using the two-dimensional flicker measuring device 3. Since the correction unit 332 is not used in this measurement, the measured flicker value is the flicker value (flicker value before correction) calculated by the calculation unit 331. Let the measured flicker value be 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 degrees and a vertical angle of 0 degrees when viewed from the two-dimensional flicker measuring device 3. The flicker value in the measurement area B-2 is measured in the same manner as in the measurement of the flicker value in the measurement area B-1. The measured flicker value is F-2. The flicker value is measured in the same manner for the measurement areas B-3 to B-15.

As described above, the flicker values F-1 to F-15 (flicker values before correction) measured at a horizontal angle of 0 degrees and a vertical angle of 0 degrees are measured in each of the measurement areas B-1 to B-15. Will be done. The flicker values F-1 to F-15 are predetermined angles and directions for each of the plurality of measurement areas B set in the measurement object A (DUT screen A) of the same model as the measurement object (DUT screen 1). It is a flicker value measured from. In addition, instead of the two-dimensional flicker measuring device 3, a spot type flicker measuring device is used, and the flicker value is set to 0 degrees in the horizontal angle and 0 degrees in the vertical angle for each of the measurement areas B-1 to B-15. May be measured.

With reference to FIGS. 3, 6A and 10, 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 measurer uses the input unit 53 to display 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 a setting screen 60 in a state in which a flicker value is input. The arithmetic processing unit 52 stores the information included in the model name column 601, the measurement area column 602, and the angle column 604 shown in FIG. 12 in the storage unit 523. The storage unit 523 stores this information. The measurer operates the next key 603 included in the setting screen 60 shown in FIG.

With reference to FIGS. 3 and 6B, the arithmetic processing unit 52 causes the display unit 54 to display the setting screen 60 shown in FIG. 13 (step S8). FIG. 13 is an explanatory diagram illustrating a setting screen 60 that has been switched by operating the next key 603 included in the setting screen 60 shown in FIG. In the measurement area column 602, in addition to the contents of the measurement area column 602 shown in FIG. 9, there is an input field for a flicker value. In the character area 600, "Set the two-dimensional flicker measuring device 3 in the original position, and use the two-dimensional flicker measuring device 3 to measure the flicker value before correction in each measurement area." Is displayed. NS. Set to the original position means that when the DUT screen A is set to the measurement position of the flicker, the optical axis AX is located at the center of the DUT screen A, and the entire DUT screen A can be photographed. The measuring device 3 is set (for example, the position shown in FIG. 2).

The measurer uses the input unit 53 to input an instruction to measure the flicker value before correction in each of the measurement areas B-1 to B-15 (step S9). The communication unit 51 transmits this command to the communication unit 35.

When the communication unit 35 receives the command, the two-dimensional flicker measuring device 3 measures the flicker value before correction in each of the measurement areas B-1 to B-15 (step T3). The flicker value before correction of each of the measurement areas B-1 to B-15 is obtained as follows. The position of the two-dimensional flicker measuring device 3 is the original position. That is, it is the same as the position where each flicker value 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 photographs the DUT screen A, and the calculation unit 331 takes the measurement area B-1 based on the photometric amount of the DUT screen A obtained by photographing the DUT screen A. Calculate the flicker value for each of ~ B-15. The calculated flicker value is f-1 to f-15. These flicker values are the flicker values of the measurement regions B-1 to B-15 before correction. That is, when the flicker values of the measurement areas 10-1 to 10-15 set on the DUT screen 1 are measured, the two-dimensional flicker measuring device 3 is moved from the position where the two-dimensional flicker measuring device 3 is installed. It is the flicker value before correction of each of the measurement areas B-1 to B-15 obtained by using.

The arithmetic processing unit 33 gives an instruction to the communication unit 35 to transmit the measurement result (flicker value f-1 to f-15) of the flicker value before correction. 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 the setting screen 60 including the received measurement result (step S10). FIG. 14 is an explanatory diagram illustrating a setting screen 60 in which a flicker value is input to the measurement area column 602 shown in FIG. Flicker values f-1 to f-15 are displayed in the flicker value columns of the measurement areas B-1 to B-15. The arithmetic processing unit 52 stores the information included in the model name column 601, the measurement area column 602, and the angle column 604 shown in FIG. 14 in the storage unit 523. The storage unit 523 stores this information.

The measurer operates the key 603 next to the setting screen 60 shown in FIG. As a result, the generation unit 522 has the measurement regions 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. Each correction coefficient of (FIG. 2) is calculated to generate table 334 (FIG. 4) (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 area B, the value obtained by graduating the flicker value F shown in FIG. 12 by the flicker value f shown in FIG. 14 becomes the correction coefficient assigned to the measurement area 10 corresponding to the measurement area B. The measurement area B-1 will be described as an example. The flicker value F-1 / flicker value f-1 is a correction coefficient assigned to the measurement area 10-1.

After the generation unit 522 generates the table 334, the arithmetic 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 a setting screen 60 including a table 334. The setting screen 60 includes a confirmation 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 confirmation key." Is displayed.

The measurer operates the input unit 53 to operate the confirmation key 605. According to this operation, the generation unit 522 sends a command to transmit the 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 to the two-dimensional flicker measuring device 3. do. Further, the generation unit 522 stores the table 334 to which these are associated in the storage unit 523 (step S13).

According to this command, the communication unit 51 transmits the table 334 in which the model name and the angle are associated with the communication unit 35 to the communication unit 35.

When the communication unit 35 receives the table 334 associated with the model name and the angle, the arithmetic processing unit 33 stores the table 334 associated with the model name and the angle in the storage unit 333 (step T5).

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

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

In the character 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 measurement is performed with respect to the selected measurement area C. Measure the flicker value for all combinations of horizontal and vertical angles (angles and directions) shown in the area column 602. Measure the measurement results in the measurement areas B-1 to B-15 shown in the measurement area column 602. Please enter in the flicker value field corresponding to each of. "Is displayed.

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

Next, the measurer sets 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) when viewed from the two-dimensional flicker measuring device 3. Set the dimension flicker measuring device 3. The measurer measures the flicker value in the measurement area B-8 using the two-dimensional flicker measuring device 3. Let the measured flicker value be f-2. The flicker value is measured in the same manner for the remaining combinations of horizontal and vertical angles. Let the measured flicker values be f-3 to f-15.

The flicker values f-1 to f-15 are a plurality of flicker values measured under a plurality of combinations of angles and directions in a predetermined measurement region C. Instead of the two-dimensional flicker measuring device 3, a spot-type flicker measuring device may be used to measure these flicker values.

Multiple combinations of horizontal and vertical angles (angles and directions) are applied to the respective horizontal and vertical angles (angles and directions) of the measurement areas 10-1 to 10-15 set on the DUT screen 1 (FIG. 2). Although it was explained in the case of matching, it does not have to match. If they do not match, the generation unit 522 has sufficient flicker values measured from the horizontal and vertical angles (angles and directions) of the measurement areas B-1 to B-15 set on the DUT screen A. Find the flicker value by interpolation for the non-horizontal and vertical angles.

The measurer determines whether or not 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 measurer uses the input unit 53 to display the flicker values f-1 to the flicker value column included in the measurement area column 602 shown in FIG. Input f-15 (step S22). FIG. 19 is an explanatory diagram illustrating a setting screen 60 in a state in which a flicker value is 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 a setting screen 60 that has been switched by operating the next key 603 included in the setting screen 60 shown in FIG. An angle field 604 is added to the setting screen 60. In the character area 600, "Enter 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 a predetermined angle and direction.

With reference to FIGS. 3, 16B and 20, the measurer operates the input unit 53 to input the horizontal angle and the vertical angle (predetermined angle and direction) for which the flicker value is to be measured into the angle column 604. (Step S24). For example, it is assumed 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 the flicker value measured from a predetermined angle and direction with respect to the predetermined measurement area C set in the measurement object A of the same model as the measurement object. Become. The arithmetic processing unit 52 stores the information included in the model name column 601, the measurement area column 602, and the angle column 604 shown in FIG. 20 in the storage unit 523. The storage unit 523 stores this information.

The measurer operates the input unit 53 and then operates the key 603. According to this operation, the generation unit 522 matches any of the 15 combinations of the horizontal angle and the vertical angle included in the measurement area column 602 shown in FIG. 20 with the horizontal angle and the vertical angle input in the angle column 604. Whether or not it is determined (step S25).

Since the horizontal angle of 0 degrees and the vertical angle of 0 degrees are input to the angle column 604, the generation unit 522 has the horizontal angle and the vertical angle input to the angle column 604 matching any of the 15 combinations. (Yes in step S25). Then, the generation unit 522 generates the table 334 (step S27). This will be explained later.

For example, when the horizontal angle 0 degree and the vertical angle +20 degree are input to the angle field 604, the generation unit 522 does not match any of the 15 combinations of the horizontal angle and the vertical angle input to the angle field 604. (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 field 604 do not match any of the 15 combinations of the horizontal angle and the vertical angle included in the measurement area field 602 shown in FIG. It is explanatory drawing explaining 60. A blank field for inputting a flicker value is added to the angle field 604. In the character area 600, "Measure the flicker value with respect to the above-selected measurement area (measurement area B-8 = measurement area C) under the horizontal angle and the vertical angle for which the flicker value is to be measured." Is displayed.

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 when viewed from the two-dimensional flicker measuring device 3. The measurer measures the flicker value in the measurement area B-8 using the two-dimensional flicker measuring device 3. Since the correction unit 332 is not used in this measurement, the measured flicker value is the flicker value (flicker value before correction) calculated by the calculation unit 331. The measured flicker value is f-0. The measurer inputs the flicker value f-0 in the blank of the flicker value item included in the angle column 604 by using the input unit 53. The arithmetic processing unit 52 stores the information included in the model name column 601, the measurement area column 602, and the angle column 604 shown in FIG. 21 in the storage unit 523. The storage unit 523 stores this information. Then, the key 603 is operated next. As a result, the generation unit 522 generates the table 334 (step S27).

In the generation unit 522, 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 area column 602 shown in FIG. If it is determined (No in step S25), the flicker value may be calculated using interpolation. explain in detail. The generation unit 522 interpolates the 15 (plural) combinations of the horizontal angle, the vertical angle, and the flicker value shown in the measurement area column 602 shown in FIG. 20 with the horizontal angle input to the angle column 604. Calculate the flicker value measured below 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 can be dealt with by interpolation.

The generation of the table 334 will be described by taking the case where Yes is determined in step S25 as an example. The generation unit 522 calculates the respective correction coefficients of the measurement regions 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. And generate table 334. The measurement areas 10-1 to 10-15 correspond to the measurement areas B-1 to B-15, respectively. The correction coefficient is a value in which each of the flicker values f-1 to f-15 is used as a numerator and the flicker value f-8 is used as the denominator of these. The measurement area B-1 will be described as an example. The flicker value f-8 / flicker value f-1 is a correction coefficient assigned to the measurement region 10-1. If No is determined in step S25, the generation unit 522 uses the flicker value f-0 instead of the flicker value f-8 to generate the table 334.

After the generation unit 522 generates the table 334, the arithmetic 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 a setting screen 60 including a 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 0 degrees (when it is determined to be Yes in step S25). The setting screen 60 includes a confirmation 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 confirmation key." Is displayed.

The measurer operates the input unit 53 to operate the confirmation key 605. 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 model of the DUT and stored in the storage unit 333. Table 334 is used for the measurement of the flicker this time and the measurement of the flicker of the same model DUT after this time.

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

For example, in the case of a liquid crystal display for a PC, the mode is set so that the flicker value is not corrected. In the case of a liquid crystal display for a PC, the distance between the position where a human 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 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 that a human feels when looking at the screen of the liquid crystal display. And there is a difference. Therefore, in such a case, the flicker measurer operates the operation unit 34 to set the mode in which the flicker value is not corrected.

The measurer operates the operation unit 34 to give an instruction to measure the flicker value. In accordance with this command, the arithmetic processing unit 33 causes the two-dimensional image sensor 32 to take a picture of the DUT screen 1 at a predetermined frame rate (step T32). As a result, the luminance signal SG indicating the brightness 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 is based on the luminance signal SG (an example of photometric quantity) input to the arithmetic processing unit 33, and the flicker value of each of the measurement areas 10-1 to 10-15 set on the DUT screen 1. Is calculated (step T33).

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

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

(Summary of embodiments)
The two-dimensional flicker measuring device according to the first aspect of the embodiment is based on the two-dimensional imaging element and the photometric amount of the measurement object obtained by the two-dimensional imaging element photographing the measurement object. A calculation unit that calculates the flicker value of each of the plurality of measurement regions set in the measurement object, and the flicker value of each of the plurality of measurement regions are set to the plurality of measurement regions from a predetermined angle and direction. Each of the above is provided with a correction unit for correcting the flicker value corresponding to the case where the light is measured.

The photometric quantity (brightness) is a physical quantity that collectively refers to the brightness and the image information signal. Luminance is the light intensity of a measurement object measured by a two-dimensional imaging device having a spectral sensitivity characteristic of a luminosity curve V (λ). The image information signal is a light intensity signal (RAW image data) generated by the two-dimensional image sensor when the two-dimensional image sensor having an arbitrary spectral sensitivity characteristic images the object to be measured.

The predetermined angle and direction are determined, for example, with reference to the normal of the surface of the object to be measured. When the optical axis of the two-dimensional flicker measuring device is oriented at an angle defined by a horizontal angle of 0 degrees and a vertical angle of 0 degrees, the optical axis and the normal line coincide with each other. The predetermined angle and direction may be, for example, the same as or substantially the same as the angle and direction of the measurement area as seen from the position where the human looks at the object to be measured. Approximately the same is the difference between the unevenness of flicker based on the flicker value measured by the two-dimensional flicker measuring device and the unevenness of flicker that humans feel when looking at the object to be measured from the position where they are looking at the object to be measured. Means the extent to which

The correction unit corrects the flicker value of each of the plurality of measurement regions to the flicker value corresponding to the case where each of the plurality of measurement regions is photometrically measured from a predetermined angle and direction. Therefore, according to the two-dimensional flicker measuring device according to the first aspect of the embodiment, the plurality of measurement areas set in the measurement object are set in consideration of the angle and direction of the measurement area as seen from the two-dimensional flicker measuring device. 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 the case where each of the plurality of measurement regions is photometrically measured from the predetermined angle and direction is stored in advance. A storage unit is further provided, and the correction unit makes the correction using the table.

In this configuration, the flicker value is corrected by using the table stored in advance in the storage unit. This is an example of a method for correcting a flicker value. As another example, the correction formula is stored in the storage unit in advance, and the correction unit has a method of correcting the flicker value by using this correction formula.

In the above configuration, an operation unit capable of selecting whether or not the correction unit corrects the flicker value of each of the plurality of measurement regions calculated by the calculation unit is further provided.

For example, in the case of a liquid crystal display for a PC, the distance between the position where a human 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 measuring device and the liquid crystal display screen. In this case, when the flicker value is corrected, the flicker unevenness based on the flicker value measured by the two-dimensional flicker measuring device and the flicker that a human feels when looking at the screen of the liquid crystal display for a PC are rather. There is a difference with the unevenness of. Therefore, in such a case, the measurer operates the operation unit to select not to correct the flicker value.

The two-dimensional flicker measurement method according to the second aspect of the embodiment is set for the measurement object based on the photometric amount of the measurement object obtained by the two-dimensional image pickup element photographing the measurement object. When the calculation step of calculating the flicker value of each of the plurality of measurement regions and the flicker value of each of the plurality of measurement regions are measured from a predetermined angle and direction in each of the plurality of measurement regions. A correction step for correcting the flicker value corresponding to the above.

The two-dimensional flicker measuring method according to the second aspect of the embodiment defines the two-dimensional flicker measuring 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 effect as the device.

The two-dimensional flicker measurement program according to the third aspect of the embodiment is set for the measurement object based on the photometric amount of the measurement object obtained by the two-dimensional image pickup element photographing the measurement object. When the calculation step of calculating the flicker value of each of the plurality of measurement regions and the flicker value of each of the plurality of measurement regions are measured from a predetermined angle and direction in each of the plurality of measurement regions. The computer is made to perform a correction step of correcting to the flicker value corresponding to.

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 according to the first aspect of the embodiment. It has the same effect as the device.

In the above configuration, the correction step is when each of the plurality of measurement regions is photometrically measured from the predetermined angle and direction with respect to the flicker value of each of the plurality of measurement regions calculated by the calculation step. The correction is made using a table that converts to the corresponding flicker value.

This configuration uses a table to correct the flicker value.

In the above configuration, prior to the calculation step, a computer is further executed to generate the table including the plurality of correction coefficients assigned to each of the plurality of measurement regions.

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

In the above configuration, the generation step includes the flicker value measured from the predetermined angle and direction for each of the plurality of measurement regions B set in the measurement object A of the same model as the measurement object. When the flicker value of each of the plurality of measurement regions is measured, it is obtained by using the two-dimensional flicker measuring device from a position where the two-dimensional flicker measuring device including the two-dimensional imaging element is installed. The plurality of correction coefficients are calculated based on the flicker value before the correction in each of the plurality of measurement regions 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 according to the model of the object to be measured. 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 described separately, and the plurality of measurement areas and the plurality of measurement areas B are described separately.

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

The flicker value before correction of each of the plurality of measurement areas B is obtained as follows. The position of the two-dimensional flicker measuring device is the same as when measuring the flicker value of each of the plurality of measurement areas set in the measurement object. In this state, the two-dimensional image sensor measures each of the plurality of measurement areas B and outputs a signal indicating the amount of photometry. The calculation unit calculates the flicker value of each of the plurality of measurement areas B based on the signal indicating the photometric amount. 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 for the measurement object are 15 measurement areas 10-1 to 10-15, and the plurality of measurement areas B set for the measurement object A are 15 measurement areas B-1. ~ B-15. The 15 measurement regions B-1 to B-15 are in the same positions as the 15 measurement regions 10-1 to 10-15. For the measurement area B-1, the flicker value measured from a predetermined angle and direction is F-1. Let it be the flicker value f-1 before correction of the measurement area B-1 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 also obtained in the same manner.

In the above configuration, in the generation step, the flicker value measured from the predetermined angle and direction and the predetermined predetermined measurement area C set in the measurement object A of the same model as the measurement object. With respect to the measurement region 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 according to the model of the object to be measured.

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

The 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 object. The number of the plurality of measurement areas set in the measurement object will be described by taking 15 as an example. The former is that the angles and directions of the 15 measurement regions set on the measurement object match the 15 combinations of the angles and directions. In the latter case, the generation step obtains the flicker value of the insufficient angle and direction among the flicker values measured from the respective angles and directions of the 15 measurement regions set in the measurement object by interpolation. That is, the flicker value of the insufficient angle and direction is obtained by interpolating the flicker value measured under a plurality of combinations of the angle and the direction for the predetermined measurement region C.

The correction coefficient will be described with a specific example. The plurality of measurement areas set for the measurement object are 15 measurement areas 10-1 to 10-15, and the plurality of measurement areas B set for the measurement object A are 15 measurement areas B-1. ~ B-15. The 15 measurement regions B-1 to B-15 are in the same positions as the 15 measurement regions 10-1 to 10-15. For the 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 also obtained in the same manner.

Although embodiments of the present invention have been illustrated and described in detail, they are merely illustrations and examples and are not limited. The scope of the invention should be construed by the wording of the accompanying claims.

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

According to the present invention, it is possible to provide a two-dimensional flicker measuring device, a two-dimensional flicker measuring method, and a two-dimensional flicker measuring program.

Claims (9)

Two-dimensional image sensor and
Based on the photometric amount of the measurement object obtained by the two-dimensional image sensor photographing the measurement object, the flicker value of each of the plurality of measurement regions set in the measurement object is calculated. Calculation unit and
A two-dimensional flicker including a correction unit that corrects the flicker value of each of the plurality of measurement regions to the flicker value corresponding to the case where each of the plurality of measurement regions is photometrically 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 the case where each of the plurality of measurement regions is photometrically measured from the predetermined angle and direction is further provided. Prepare,
The two-dimensional flicker measuring device according to claim 1, wherein the correction unit makes the correction using the table. Claim 1 or 2 further includes an operation unit capable of selecting whether or not the correction unit corrects the flicker value of each of the plurality of measurement regions calculated by the calculation unit. The two-dimensional flicker measuring device described in 1. Based on the photometric amount of the measurement object obtained by the two-dimensional image sensor photographing the measurement object, the flicker value of each of the plurality of measurement regions set in the measurement object is calculated. Calculation steps and
A two-dimensional flicker comprising a correction step of correcting the flicker value of each of the plurality of measurement regions to the flicker value corresponding to the case where each of the plurality of measurement regions is photometrically measured from a predetermined angle and direction. Measuring method. Based on the photometric amount of the measurement object obtained by the two-dimensional image sensor taking a picture of the measurement object, the flicker value of each of the plurality of measurement areas set in the measurement object is calculated. Calculation steps and
A computer is made to perform a correction step of correcting the flicker value of each of the plurality of measurement regions to the flicker value corresponding to the case where each of the plurality of measurement regions is photometrically measured from a predetermined angle and direction. Dimension flicker measurement program. The correction step corresponds to the case where each of the plurality of measurement regions is photometrically measured from the predetermined angle and direction with respect to the flicker value of each of the plurality of measurement regions calculated by the calculation step. The two-dimensional flicker measurement program according to claim 5, wherein the correction is performed using a table that converts the values. The two-dimensional flicker measurement according to claim 6, wherein, prior to the calculation step, a computer is further subjected to 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 generation step
The flicker value measured from the predetermined angle and direction for each of the plurality of measurement regions B set in the measurement object A of the same model as the measurement object.
When the flicker value of each of the plurality of measurement regions is measured, it is obtained by using the two-dimensional flicker measuring device from a position where the two-dimensional flicker measuring device including the two-dimensional imaging element is installed. The flicker value before the correction of each of the plurality of measurement regions B and the flicker value.
The two-dimensional flicker measurement program according to claim 7, which calculates the plurality of correction coefficients based on the above. The generation step
With respect to the predetermined measurement area C set in the measurement object A of the same model as the measurement object, the flicker value measured from the predetermined angle and direction, and the flicker value.
A plurality of the flicker values measured under a plurality of combinations of angles and directions with respect to the predetermined measurement region C.
The two-dimensional flicker measurement program according to claim 7, which calculates the plurality of correction coefficients based on the above.

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