JP2018187235A - Visual dynamic range measurement device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for easily performing measurement of a visual dynamic range which contributes to evaluation of photophobia or the like or a measurement method of a visual dynamic range capable of executing easily the measurement thereof.SOLUTION: A visual dynamic range measurement device of the invention comprises control means for controlling display means 2 and input means 4, in which the display means 2 displays a gradation target 20 which is a target in which brightness gradually changes from a brightest part to a darkest part, the input means 4 receives at least one of an input of a brightest part supposition boundary which is a boundary between a part which is supposed so that appearance is same to that in the brightest part for a subject, and a part which is not supposed so that appearance is same to that in the brightest part for a subject, and an input of a darkest part supposition boundary which is a boundary between a part which is supposed so that appearance is same to that in the darkest part for a subject and a part which is not supposed so that appearance is same to that in the darkest part, in the gradation target 20, and the control means calculates a visual dynamic range measurement value based on at least one of the position of the brightest part supposition boundary and the position of the darkest part supposition boundary.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus for measuring the visual dynamic range of a subject and a method for measuring the visual dynamic range of a subject.

The visual dynamic range is the range of brightness that can be seen at first glance, and is the ratio of the maximum and minimum values of light that can be distinguished at one time. It is related to dawn, or dawn, which is a condition that causes no discomfort or eye pain when receiving strong light from the outside. Dawn can occur in healthy individuals with intense light, but it can be felt in patients with eye diseases and in former patients after treatment of eye diseases, even if the light is not so strong.
As a system for evaluating glare, a system described in JP 2016-140612 A (Patent Document 1 below) is known. In this system, a subject in a darkroom subjectively evaluates the degree of glare of an evaluation target light source such as a lighting fixture, and the evaluation result input unit selects any one of a plurality of degrees of glare. Select and enter the degree of glare. There are a plurality of illumination conditions for the evaluation target light source, which are sequentially switched. During the switching, a predetermined reset time corresponding to the previous illumination condition is ensured with the evaluation target light source turned off.
Japanese Patent Laid-Open No. 2013-250651 (the following patent document) discloses a light-shielding device that performs appropriate light-shielding related to light incident from the outside by a light-shielding unit that can be switched between a light-shielded state and a non-light-shielded state. Those described in 2) are known. In this device, a near-infrared light is applied to the face of the driver to capture a face image, and the pupil diameter is measured from the face image, thereby grasping the reaction to light incident from the outside, and the measured pupil Based on the size of the diameter, the ratio of the light-shielding period and the non-light-shielding period per cycle, which is switched between the light shielding state and the non-light shielding state in the light shielding means, is changed to a predetermined ratio where the driver does not feel dazzling. .

JP 2016-140612 A JP 2013-250651 A

In the system of Patent Document 1, when a subject selects and inputs the degree of glare of an evaluation target light source, a dark room, an evaluation target light source, illumination condition changing means, and an evaluation result input unit are all required, which is relatively large. There will be a cost. In addition, it is necessary to secure a reset time, and it takes time to evaluate glare.
In the apparatus of Patent Document 2, the response to light incident from the outside is grasped by measuring the pupil diameter. However, a set of near infrared light irradiation means, imaging means, and face image analysis means are necessary, which are relatively Is costly and expensive. In addition, the pupil diameter varies from driver to driver, and also depends on the driver's psychological state. Therefore, there are cases in which it is relatively inaccurate to grasp the response to light by measuring the pupil diameter. However, it is difficult to compare the degree of light reaction between different drivers.
Therefore, a main object of the present invention is to provide a device that can easily measure a visual dynamic range that leads to evaluation such as dawn, or a visual dynamic range measuring method that can be easily executed.

In order to achieve the above object, according to the first aspect of the present invention, in the visual dynamic range measuring apparatus, display means for displaying various information, input means for receiving input by a subject, the display means, and the input means Control means for controlling the display, the display means displays a gradation target that is a target whose brightness changes stepwise from the brightest part to the darkest part, and the input means Of the marks, the input of the assumed brightest part boundary that is the boundary between the part that is assumed to be the same as the brightest part in the subject and the part that is not the same, and the same appearance as the darkest part in the subject Accepting at least one of an input of an assumed darkest part boundary that is a boundary between a part that is assumed to be and a part that is not, the control means The visual dynamic range measurement value or a visual dynamic range related value, which is a value related to the visual dynamic range measurement value, is calculated based on at least one of the position of the darkest part assumed boundary and the position of the darkest part assumed boundary. .
The invention described in claim 2 is characterized in that, in the above invention, the change in brightness in the gradation target is proportional to the distance from the darkest portion.
The invention described in claim 3 is characterized in that, in the above invention, the brightest part is white and the darkest part is black.
The invention according to claim 4 is characterized in that, in the above-mentioned invention, the brightest portion exhibits white by additive color mixing of light of a predetermined color.
The invention according to claim 5 is characterized in that, in the above-mentioned invention, the display means can display by changing the brightness of the background portion of the gradation target.
The invention according to claim 6 is characterized in that, in the above invention, the control means measures a response time of input by the subject.
The invention according to claim 7 is the above invention, wherein the control means measures ambient illuminance.
According to an eighth aspect of the present invention, in the above invention, the control means corrects the visual dynamic range measurement value or the visual dynamic range related value based on a predetermined correction formula that is a function of the illuminance. It is a feature.
The invention according to claim 9 is characterized in that, in the above invention, the control means determines whether or not the visual dynamic range measurement value or the visual dynamic range related value is within a predetermined range. To do.
The invention according to claim 10 is the above invention, wherein the input means receives at least one of the input of the brightest part assumed boundary and the input of the darkest part assumed boundary a plurality of times, and the control means includes: An average value of at least one of the positions of the plurality of assumed brightest part boundaries and the positions of the plurality of assumed darkest part boundaries is calculated.
The invention according to claim 11 is a visual dynamic range measurement method, wherein a gradation target display step for displaying a gradation target that is a target whose brightness changes stepwise from the brightest part to the darkest part, Of the gradation targets, the input of the assumed brightest part boundary that is the boundary between the part that is assumed to be the same as the brightest part in the subject and the part that is not, and the same appearance as the darkest part in the subject An input receiving step for receiving at least one of an input of a darkest part assumed boundary that is a boundary between a part that is assumed to be a part and a part that is not, a position of the brightest part assumed boundary, and the darkest part assumed boundary Based on at least one of the positions of the visual dynamic range measurement or related visual dynamic range And visual dynamic range calculation step of calculating a continuous value, is characterized in that it has a.

  The main effect of the present invention is to provide a device that can easily measure a visual dynamic range that leads to evaluation such as dawn, or a visual dynamic range measuring method that can be easily executed.

It is a block diagram of the visual dynamic range measuring device concerning the present invention. It is explanatory drawing of the display means of FIG. It is a flowchart which concerns on the operation example thru | or visual dynamic range measuring method of the measuring device of FIG.

  Hereinafter, examples of embodiments according to the present invention will be described with reference to the drawings as appropriate. In addition, the form of this invention is not limited to the following.

≪Configuration etc.≫
As shown in FIG. 1, a visual dynamic range measuring device (measuring device) 1 according to the present invention includes a display means 2, an input means 4, an illuminance sensor 8, a counter 10, a storage means 11, and controls these. And control means 12 for performing the above.
The measuring device 1 is formed by executing a visual dynamic range measurement program (program) 14 stored in the storage unit 11 by the control unit 12 in a tablet device (including a tablet and a smartphone) provided with these units. Is done.
The measuring apparatus 1 may be formed by a device (computer) other than a tablet device such as a desktop computer, a notebook computer, or a packaged integrated circuit.

As shown in FIG. 2, the display unit 2 is a tablet monitor, and can display a gradation target 20 that is a band-like rectangle including a gradation from white to black inside in a horizontally long manner.
In the gradation target 20, each vertical line segment has the same brightness, the left side (left end) is white with the highest brightness (the brightest part), and the right side (right end) is the black with the lowest brightness. (Darkest part). The brightness of each line segment in the gradation target 20 changes so as to decrease in proportion to the distance (distance) from the left side between the brightest part and the darkest part (linear change of gradation). For example, the lightness of the pixel in the display unit 2 is specified stepwise as a pixel lightness designation value that is lighter as the numerical value is smaller by a numerical value of 0 or more and 65535 or less, and the pixel column related to the left side of the gradation target 20 65535, the pixel column related to the right side of the gradation target 20 is set to the pixel brightness specification value 0, and the pixel brightness specification value of the pixel column between these is reduced in proportion to the distance from the left side. . In the gradation target 20, the change in the brightness related to the adjacent line segment is slight, and it can be considered that the brightness changes continuously according to the position, and a monochrome gradation appears.
In general, the left part of the gradation target 20 (the length of 1/3 of the whole horizontal direction) is a bright part based on white, and the right part (the length of 1/3 of the whole horizontal direction) is black. The dark part becomes the middle part based on gray. The left half is a bright part and the right half is a dark part. The intermediate part may not be considered, or the bright part, the dark part, and the intermediate part may be grasped in other ways.
The white color in the bright part (including the brightest part) of the gradation target 20 is configured by additive color mixing of predetermined color light. More specifically, each pixel has a red light emitting portion, a green light emitting portion, and a blue light emitting portion capable of emitting light in a state in which strength is specified for three colors of red, green, and blue. As a result of the additive color mixture of yellow having an intensity distribution peak around 560 nm generated by the additive color mixture and blue having an intensity distribution peak around 440 nm generated by the blue light emitting part, the gradation target 20 is brightened. The white color in the area is emitted. Similarly, the gray portions of the bright portion, the intermediate portion, and the dark portion are also configured by additive color mixing.
Note that the gradation target 20 may be displayed vertically, may be square, or may be a band along a ring or polygon. Further, the gradation in the gradation target 20 may change in a curved line, for example, the lightness of the line segment may decrease in proportion to the square of the distance from the brightest part, The lightness of the line segment may decrease in proportion to the 1/2 power of the journey from the brightest part, or the lightness of the line segment may decrease in proportion to the logarithm of the journey from the brightest part. It may be.

In addition, a title 22 and an operation guidance message 24 can be displayed above the gradation target 20.
The title 22 is a “dynamic range test”.
The operation guidance message 24 prompts the user to input the boundary between the part that is assumed to be the same as the brightest part (the brightest part assumed part) and the part that does not appear (the brightest part assumed boundary). Enter the boundary between the part that is supposed to look the same as the darkest part (the darkest part assumed part) and the part that does not appear (the darkest part assumed boundary). "Tap the last spot that looks black" is selectively displayed or hidden depending on the situation. The operation guidance message 24 may be displayed with other contents.

Further, an input stage guidance message 26 and a return button 28 can be displayed below the gradation target 20.
The input stage guidance message 26 is a numerical value indicating which stage is currently selected among a plurality of inputs (a set of input of the brightest part assumed boundary and input of the darkest part assumed boundary) up to a predetermined upper limit for the gradation target 20. And the current number of stages and the upper limit number (here, 10 but other numbers including 1 may be included).
The return button 28 has a description “return one” enclosed in a rectangle.
Note that at least one of the display of the title 22, the operation guidance message 24, the input stage guidance message 26, the return button 28, and the like may be omitted. In addition, other information may be displayed.

And the part other than said display element in the display means 2 is the background part 30. FIG.
The background portion 30 can be changed to white, gray, or black by designating luminance, and can be changed to any lightness.
Note that the display element described above may correspond to white (or the content of the gradation visual target 20) with a black border in order to correspond to the luminance change (discoloration) of the background portion 30. Further, the display elements (except for the gradation target 20) may be changed to a color different from the color according to the luminance change (color change) of the background portion 30.

The input unit 4 includes a touch sensor that covers the display unit 2 in a state where display is not hindered.
The input unit 4 detects an input to any line segment in the displayed gradation target 20 and controls the control unit 12 to obtain information (line segment correspondence information 40) corresponding to the line segment (position). To tell. Input to the line segment is performed by touching the displayed line segment. Examples of the line segment correspondence information 40 include the distance (number of pixels) from the right side of the gradation target 20 to the line segment, the coordinate value of the line segment viewed from a predetermined origin, the brightness of the line segment, or a combination thereof. .
The input means 4 can accept the brightest part assumed boundary line segment correspondence information 40a corresponding to the brightest part assumed boundary in the gradation visual target 20. Further, the input unit 4 can accept the darkest part assumed boundary line segment correspondence information 40 b corresponding to the darkest part assumed boundary in the gradation visual target 20. Any one of the brightest part assumed boundary line segment correspondence information 40a and the darkest part assumed boundary line segment correspondence information 40b may be omitted.
The input means 4 accepts an input regarding a set of the brightest part assumed boundary line segment correspondence information 40a and the darkest part assumed boundary line segment correspondence information 40b for each of a plurality of inputs up to a predetermined upper limit for the gradation target 20. It should be noted that the shape of the gradation visual target 20 displayed in a part of the plurality of inputs to the gradation visual target 20 and the mode of gradation change may be made different from those of other times. In this case, the order of the times for displaying differently from the other times may be determined in advance or may be determined at random. There may be three or more types of the shape of the gradation target 20 and the manner of gradation change. In addition, for the purpose of improving the reliability by discriminating answers based on the inertia of the subject, the results are summarized for each type of the shape of the gradation target 20 and the mode of change of the gradation, and the results are multiplied by a certain amount or more. If they are distant, answers of a predetermined shape or change may be excluded, or input may be re-executed.

The input unit 4 detects contact with various buttons displayed on the display unit 2 and notifies the control unit 12 that there is an input to the button. For example, when the input unit 4 receives an input at a portion corresponding to the displayed return button 28, the input unit 4 notifies the control unit 12 that there is an input to the return button 28.
The input in the input means 4 may be based on contact with the finger of the subject, may be based on the digitizer pen held by the subject, or based on the proximity of the finger or the digitizer pen. May be. The input unit 4 may be a pointing device such as a mouse or a stick.

The illuminance sensor 8 is composed of a photodiode, and can measure the illuminance around the measuring device 1 (gradation target 20).
Illuminance information 42 which is information corresponding to the measured illuminance is transmitted to the control means 12.
The illuminance information 42 is acquired at the time of receiving input of the brightest part assumed boundary line segment correspondence information 40a for the first time.
Note that a plurality of illuminance information 42 may be acquired for each of a plurality of inputs, such as each time, input of the brightest part assumed boundary, or input of the darkest part assumed boundary.

The counter 10 can measure the time between two time points, and starts counting from the previous time point and finishes counting at the later time point.
The counter 10 may be integrated with the control means 12.
The counter 10 can measure a response time that is a time from the start of input acceptance to the gradation target 20 to the completion of the input.
Response time information 44 corresponding to the measured response time is transmitted to the control means 12.

The storage means 11 is composed of a memory, and in addition to the program 14, the line segment correspondence information 40 of the gradation target 20 for each time (a pair of brightest part assumed boundary line correspondence information 40a, darkest part assumed boundary line correspondence) Information 40b), illuminance information 42, response time information 44 for each time, visual dynamic range measurement value information 50 (lightest part assumed part average information 50a, darkest part assumed part average information 50b), correction formula information 52, brightest Various pieces of information such as the assumed part range information 54a and the darkest part assumed part range information 54b are stored. Various types of information may indicate the state as it is, for example, the visual dynamic range measurement value information 50 is the visual dynamic range measurement value itself. Further, the storage means 11 may be stored in a different format corresponding to the state as it is.
The line segment correspondence information 40 is stored in association with the input status (how many times it is, whether it is the brightest part boundary line segment correspondence information 40a or the darkest part boundary line segment correspondence information 40b). The
Similarly, the response time information 44 is also stored in association with the input status.
Further, visual dynamic range measurement value information 50 corresponding to the visual dynamic range measurement value measured according to the line segment correspondence information 40 is stored. The visual dynamic range measurement value information 50 is the brightest part assumed part average information obtained by calculating the average value of the size of the brightest part assumed part indicated by the brightest part assumed boundary line correspondence information 40a acquired a plurality of times. 50a and the darkest part assumed part average information 50b obtained by calculating the average value of the size of the darkest part assumed part indicated by the darkest part assumed boundary line correspondence information 40b acquired a plurality of times. .

Furthermore, according to the illuminance indicated by the illuminance information 42, correction formula information 52 corresponding to a correction formula for converting the visual dynamic range measurement value according to the visual dynamic range measurement value information 50 into a conversion value at a predetermined reference illuminance. Is memorized. Here, the correction formula is the following formula (1), but other formulas may be used.
y = ax + b (1)
y: Value after conversion of the ratio of the lightest part assumed part or the darkest part assumed part to the whole a: correction coefficient (a negative number when y is the lightest part assumed part, a positive number when the darkest part assumed part)
x: Value before conversion of the ratio of the lightest part assumed part or the darkest part assumed part to the whole b: correction constant In addition, the storage means 11 includes the lightest part assumed information indicated by the lightest part assumed boundary line segment correspondence information 40a. Lightest part assumed part range information 54a corresponding to the lightest part assumed part range which is a predetermined range related to the size of the part (the position of the lightest part assumed boundary line segment) and the darkest part assumed boundary line segment correspondence information 40b The darkest part assumed part range information 54b corresponding to the darkest part assumed part range, which is a predetermined range related to the size of the darkest part assumed part (position of the darkest part assumed boundary line segment) shown in FIG. The lightest part assumed part range information 54a is information relating to the range of the size of the lightest part assumed part (position of the lightest part assumed church) in a healthy person measured in advance, and the darkest part assumed part range information 54b is It is the information regarding the range of the magnitude | size of the darkest part assumption part in the healthy person measured beforehand.
The memory may be a flash memory (including a solid state drive), a hard disk drive, or a combination thereof. In addition, the illuminance information 42 corresponds to the number of times of input, and whether the illuminance information 42 is input at any of the bright part assumed boundary line correspondence information 40a or the dark part assumed boundary line correspondence information 40b. And may be stored in association with each other. Furthermore, the brightest part assumed part range information 54a may be determined by analysis based on the size of the brightest part assumed part in a healthy person, and the same applies to the darkest part assumed part range information 54b.

The control means 12 is composed of a central processing unit (CPU).
The control unit 12 calculates or stores various types of received information in the storage unit 11. The control means 12 can also read (receive) information stored in the storage means 11 by designating it.
The control means 12 may be a microprocessor (MPU), a microcomputer (microcomputer), or the like. Further, the control means 12 may be distributed in a cooperatively controllable manner in at least one of various means such as the display means 2 and the input means 4 instead of the CPU or together with the CPU.

≪Operation or measurement method≫
Next, an operation example of the measuring device 1 or a visual dynamic range measuring method (measuring method) executed by the measuring device 1 will be described with reference to FIG. 3 as appropriate.
The processing step is abbreviated as S as appropriate.

The control means 12 first causes the illuminance sensor 8 to transmit the illuminance information 42 by the activation of the program 14 based on the tap of the icon, and stores it in the storage means 11 (S1).
The control means 12 sets the loop counter i = 1 (initial value) (S2). The loop counter i is a counter for repeating a predetermined process a plurality of times (performing a loop process) in order to acquire a set of the brightest part assumed boundary line segment correspondence information 40a and the darkest part assumed boundary line segment correspondence information 40b a plurality of times. Here, i is increased by 1 from 1 to 10 in order to repeat 10 times.

Next, the control means 12 causes the display means 2 to display an input reception screen as shown in FIG. 2 relating to the i-th (first) (S3, gradation target display step). The input acceptance screen includes a gradation target 20. Note that the display process of the gradation target 20 may be performed before the loop process without entering the loop process. In this case, the same gradation target 20 is used each time. The display process of the gradation target 20 may be performed based on one or more types of gradation target 20 patterns stored in advance in the storage unit 11, or the gradation target 20 pattern is calculated each time. Or a combination of these such as correcting a prestored pattern by calculation.
On the input acceptance screen, the control means 12 first displays the operation guidance message 24 “Tap the last spot that looks white” and accepts the input of the assumed brightest part boundary for the gradation target 20. Command (S4, part of input acceptance step). The test subject performs an input to the gradation target 20 by tapping, and the control unit 12 obtains the line segment correspondence information 40 (the brightest part assumed boundary line segment correspondence information 40a) from the input unit 4 and relates to the first time. The data is stored in the storage unit 11.
The control means 12 starts measuring the response time using the counter 10 at the start of display of the input reception screen (at the start of input of the brightest part assumed boundary).
Next, the control means 12 changes the operation guidance message 24 to “tap the last spot that looks black”, and instructs the acceptance of the input of the assumed brightest part boundary for the gradation target 20 (S5). Part of the input acceptance step). The subject inputs in the same manner, and the control unit 12 obtains the line segment correspondence information 40 (darkest part assumed boundary line segment correspondence information 40b) from the input unit 4 and stores it in the storage unit 11 as related to the first time. . Note that when the input of S5 related to i = 1 (first time) is made, the measurement of the response time using the counter 10 is terminated, and the response time information 44 related to the measured response time is stored in the storage unit 11. Let
Subsequently, the control means 12 adds 1 to the loop counter i in S6, returns to S2, and repeats S2 to S6 until the process of i = 10 is completed. The control means 12 rewrites the input stage guidance message 26 based on the loop counter i in each S6. When the control means 12 grasps the input to the return button 28, the current input information can be erased or overwritten, i is decreased by 1 (if i = 1), and the process returns to S2. Continue processing.
Note that S4 and S5 may be performed in the reverse order, and S4 and S5 may be executed by changing the order for each input. Further, one of S4 and S5 may be omitted. Furthermore, the illuminance information 42 may be acquired once at a predetermined input, or may be acquired a plurality of times such as for each input. The response time may be acquired only once or every other time. Still further, the control means 12 may perform processing so as to redo the input when the response time is equal to or greater than a predetermined value. In addition, the control means 12 may change the color of the peripheral portion of the background portion 30 or the gradation target 20 at random or according to the illuminance every time or every input. The color change mode may be changed from a linear change to a curvilinear change or from a curvilinear change to another curvilinear change.

When the control means 12 acquires 10 inputs related to the set of the brightest part assumed boundary line segment correspondence information 40a and the darkest part assumed boundary line segment correspondence information 40b, the control unit 12 of the brightest part assumed part indicated by the former (for 10 times) The average value of the brightest part assumed part average information 50a is obtained by calculating the average value of the magnitude and stored in the storage means 11, and the average value of the size of the darkest part assumed part indicated by the latter (for 10 times) is calculated. The darkest part assumed part average information 50b is acquired and stored in the storage unit 11 (S7).
The control means 12 may calculate the average value of the magnitudes of 8 times, excluding the maximum value and the minimum value of 10 times, and further the second largest value and the second smallest value. The average value of the size for 6 times may be calculated. Further, the control means 12 may calculate an average value by excluding those whose response time is the maximum value or the minimum value, or the response time may be a predetermined value (which may be the same as or different from the above-mentioned predetermined value). It is also possible to calculate the average value by excluding those that are the same). Furthermore, the control means 12 may obtain the lightest part assumed part average information 50a and the darkest part assumed part average information 50b by a weighted average that takes into account the illuminance and response time for each input.

Moreover, the control means 12 is a correction formula with respect to the size of the brightest part assumption part and the size of the darkest part assumption part concerning the obtained brightest part assumption part average information 50a and the darkest part assumption part average information 50b. Correction by the correction formula indicated by the information 52 is performed and stored again in the storage means 11 (S8).
The control means 12 corrects the lightest part assumed boundary line segment correspondence information 40a and the darkest part assumed boundary line segment correspondence information 40b, and then performs the lightest part assumed part average information 50a and the darkest part assumed part. The average information 50b may be calculated. Also, S1 and S8 may be omitted. Furthermore, the correction formula information 52 may be incorporated in the program 14, and the same applies to other information. In addition, in the storage unit 11, the brightest part assumed part average information 50a and the darkest part assumed part average information 50b before correction may be left.

Then, the control means 12 compares the corrected brightest part assumed part average information 50a with the brightest part assumed part range information 54a, and the size of the brightest part assumed part indicated by the former is within the range indicated by the latter. Judge whether it is in or not. If the control means 12 determines that it is not present, it determines that there is a possibility that the visual dynamic range is not healthy in the bright part (generates bright part caution information), and stores it in the storage means 11 (upper part of S9). .
Similarly, the control means 12 determines whether or not the size of the darkest portion assumed portion related to the darkest portion assumed portion average information 50b is within the range indicated by the corrected darkest portion assumed portion range information 54b. If it is determined that the visual dynamic range is not present, it is determined that there is a possibility that the visual dynamic range is not healthy in the dark part (the dark part caution information is generated), and is stored in the storage unit 11 (lower part of S9).
Further, the control means 12 includes a portion sandwiched between the corrected most bright portion assumed portion average information 50a and the darkest portion assumed portion average information 50b, that is, the most bright portion assumed boundary (average position of 10 times) and the darkest portion. A visual dynamic range measurement value is calculated based on the size in the intermediate portion between the assumed boundaries (10 average positions), and the visual dynamic range measurement value information 50 corresponding to this is stored in the storage means 11 (S10). Visual dynamic range calculation step). The visual dynamic range measurement value may be a value obtained by dividing the brightness corresponding to the lightest part assumed part boundary position by the lightness corresponding to the darkest part assumed part boundary position, or a relative value converted according to the value. It may be a small value or may be calculated by another formula.
The average of the size of the lightest part assumed part related to the lightest part assumed part average information 50a (the average of the positions of the lightest part assumed boundary) and the size of the darkest part assumed part related to the darkest part assumed part average information 50b The average (the average of the positions of the darkest possible boundary) is a visual dynamic range related value that is a value related to the visual dynamic range measurement value.
In addition, S9 and S10 may be performed by changing the order, and S9 may be omitted. Further, the control means 12 may determine whether or not the visual dynamic range measurement value is within a predetermined range (such as a healthy person's range).

Subsequently, the control unit 12 causes the display unit 2 to display the measurement result (S11).
That is, when there is a visual dynamic range measurement value and bright portion caution information or dark portion caution information, that fact is displayed.
Note that at least one of these may not be displayed.
In addition, when there is no bright portion caution information or dark portion caution information, a message to that effect may be displayed.
Further, instead of or together with the visual dynamic range measurement value itself, it is determined in stages based on the visual dynamic range measurement value information 50, the brightest part assumed part average information 50a, the darkest part assumed part average information 50b, and the like. An indicator (level 1 or rank A), a message (you may feel dazzling), or the like may be displayed.
Further, other information such as the brightest part assumed part average information 50a, the darkest part assumed part average information 50b, the illuminance information 42, and the response time information 44 may be displayed.
In addition, the control unit 12 does not display the measurement result on the display unit 2 and is a device for a tester (measurement operator) connected to the measurement apparatus 1 so as to be communicable (for example, another tablet device capable of wireless communication) ) May send the measurement result. If the measurement result is displayed on the device for the tester, the tester can explain to the subject according to the condition of the subject based on the result without showing a direct result. In this case, the measurement apparatus 1 is the first apparatus, and the device for the tester is the second apparatus, and these apparatuses constitute a visual dynamic range measurement system.

The tester can evaluate the presence / absence or degree of dawn or the like related to the subject from the measurement result.
For example, in measurements related to subjects who are dawning at brightness that is not usually a problem and who are nightblind in the dark, there is a tendency to obtain results with a narrow visual dynamic range. The higher the value, the more likely the result is that the visual dynamic range becomes narrower.
Further, in the measurement related to the subject who can recognize the light but does not recognize the night blindness, the visual dynamic range tends to be shifted to the bright side.
Furthermore, the tester can grasp the necessity of light-shielding glasses (sunglasses, etc.) in the subject and the degree of light-shielding (transmittance) in the light-shielding glasses based on the size of the visual dynamic range measurement value, etc. it can.
In addition, the tester can confirm the effect of the light shielding glasses by performing visual dynamic range measurement on the subject wearing the light shielding glasses. In this case, the tester can compare the measurement result when the light-shielding glasses are not worn.
When only the brightest part assumed boundary line segment correspondence information 40a or the brightest part assumed part average information 50a is acquired, the control means 12 uses the visual dynamic range bright part side as related information of the visual dynamic range measurement value. Information can be acquired. The control means 12 can also determine the bright part caution information based on the visual dynamic range bright part side information, and display at least one of these pieces of information on the display means 2 or the like to be used for evaluation related to light. be able to.
On the other hand, even when only the darkest part assumed boundary line segment correspondence information 40b or the darkest part assumed part average information 50b is obtained, the visual dynamic range dark part side information can be obtained in the same manner, and determination or issue of dark part caution information is required. Or provide for evaluation of night blindness.

≪Effects≫
The above measuring apparatus 1 includes a display unit 2 for displaying various information, an input unit 4 for receiving input from a subject, and a control unit 12 for controlling the display unit 2 and the input unit 4. 2 displays a gradation target 20 that is a target whose brightness changes stepwise from the brightest part to the darkest part, and the input means 4 has the same appearance as the brightest part of the gradation target 20 in the subject. Input of the brightest part assumed boundary that is the boundary between the part that is assumed to be and the part that is not, and the darkest part assumption that is the boundary between the part that is assumed to be the same as the darkest part in the subject and the part that is not the same The control means 12 receives at least one of the boundary inputs, and the control unit 12 determines the position of the brightest part assumed boundary (the brightest part assumed boundary line segment correspondence information 40a) and the position of the darkest part assumed boundary (darkest part assumption). Based on at least one of the line segment correspondence information 40b), a visual dynamic range measurement value (visual dynamic range measurement value information 50), or a visual dynamic range related value that is a value related thereto (brightest portion assumed portion average) Information 50a, darkest part assumed part average information 50b, etc.).
Therefore, the quantitative measurement of the visual dynamic range that leads to the evaluation such as dawn can be easily performed only by the subject inputting the gradation target 20. The tester and the subject can objectively determine the necessity and type of the light-shielding glasses by grasping the visual dynamic range measurement value, and can quantitatively determine the effect of the light-shielding glasses. Furthermore, the tester and the subject can perform evaluation related to night blindness, etc., and can take into account the subject in the guidance of paying attention at night and in the dark, and ensuring lighting and lighting as much as possible. In addition, quantitative data related to dawn and night blindness can be accumulated, and the tester can use the measuring device 1 for analysis of mechanisms such as eye diseases or dawn and night blindness.

Moreover, the change of the brightness in the gradation target 20 is proportional to the distance from the darkest part. Therefore, the gradation target 20 is easy to understand, and input and analysis thereof are easy.
Furthermore, the brightest part is white and the darkest part is black. Therefore, light and dark are simply expressed and easy to process.
Furthermore, the brightest part exhibits white due to additive color mixing of light of a predetermined color. Therefore, the brightest part is presented more clearly than when the reflected light of the brightest part is visually recognized as in the case where the gradation target 20 is printed on paper.
Moreover, the display means 2 can change and display the brightness of the background part 30 of the gradation target 20. Therefore, there are a plurality of variations in the brightness of the background portion 30, and the combined use of the results displayed at a plurality of brightnesses further improves the accuracy of measurement of the visual dynamic range.
In addition, the control means 12 (counter 10) measures the response time (response time information 44) of the input by the subject. Therefore, in the measurement of the visual dynamic range, the input situation is taken into consideration, and more accurate measurement is performed.
Moreover, the control means 12 measures the illuminance (illuminance information 42) around the measuring device 1 (gradation target 20). Therefore, in the measurement of the visual dynamic range, the ambient illuminance is taken into account, more accurate measurement is performed, and it is not necessary to prepare a dark room, and the measurement is easy.
Further, the control means 12 corrects the visual dynamic range measurement value or the visual dynamic range related value based on a predetermined correction formula (correction formula information 52) that is a function of illuminance. Therefore, ambient illuminance is automatically and more specifically taken into account.
Furthermore, the control means 12 determines whether or not the visual dynamic range measurement value or the visual dynamic range related value is within a predetermined range (the brightest part assumed part range information 54a and the darkest part assumed part range information 54b). to decide. Therefore, if a predetermined range is determined based on a plurality of measurement values for healthy subjects, it is automatically determined whether or not the current visual dynamic range measurement values are within a range where a plurality of healthy people can enter. Can be judged.
In addition, the input unit 4 receives at least one of the input of the brightest part assumed boundary and the input of the darkest part assumed boundary a plurality of times, and the control unit 12 includes a plurality of positions of the brightest part assumed boundary and a plurality of The average value of at least one of the positions of the darkest part assumed boundary (the brightest part assumed part average information 50a, the darkest part assumed part average information 50b) is calculated. Therefore, the measurement of the visual dynamic range is performed more accurately by acquiring or leveling a plurality of samples.

On the other hand, in the above measurement method, the gradation target display step S3 for displaying the gradation target 20 that is a target whose brightness changes stepwise from the brightest part to the darkest part, and among the gradation target 20, the subject The input of the assumed brightest part boundary, which is the boundary between the part that is assumed to be the same as the lightest part and the part that is not, and the part that is assumed to be the same as the darkest part in the subject At least one of input receiving steps S5 and S6 for receiving at least one of the input of the darkest part assumed boundary which is a boundary of the part, the position of the brightest part assumed boundary, and the position of the darkest part assumed boundary Based on the visual dynamic range measurement value or a visual dynamic range related value that is a value related thereto. With a di-calculating step S10, the.
Therefore, by inputting to the gradation target 20 by the subject, it is possible to easily perform quantitative measurement of the visual dynamic range that leads to the evaluation of the dawn and the like, and the analysis regarding the light-shielding glasses and the dawn related to the subject is easily performed.

  1 .... (visual dynamic range) measuring device, 2 .... display means, 4 .... input means, 10 .... counter, 12 .... control means, 20 .... gradation target, 30 ... background part, 40a ... Brightest part assumed boundary line correspondence information, 40b .. Darkest part assumed boundary line correspondence information, 42 .. Illuminance information, 44 .. Response time information, 50 .. Visual dynamic range measurement value information, 50a .. Assumed part average information, 50b .. darkest part assumed part average information, 52 .. correction formula information, 54a .. brightest part assumed part range information, 54b .. darkest part assumed part range information, S3. Display step, S5, S6... Input reception step, S10 .. Visual dynamic range calculation step.

Claims (11)

Display means for displaying various information;
Input means for receiving input by the subject;
Control means for controlling the display means and the input means;
With
The display means displays a gradation target that is a target whose brightness changes stepwise from the brightest part to the darkest part,
In the gradation target, the input means inputs a brightest part assumed boundary that is a boundary between a part that is assumed to be the same as the brightest part in the subject and a part that is not, and the subject. Accept at least one of the input of the assumed darkest part boundary that is the boundary between the part that is assumed to be the same appearance as the darkest part and the part that is not,
The control means is a visual dynamic range measurement value or a visual dynamic range related value which is a value related to the visual dynamic range measurement value based on at least one of the position of the brightest part assumed boundary and the position of the darkest part assumed boundary. Visual dynamic range measuring device characterized by calculating The visual dynamic range measurement apparatus according to claim 1, wherein a change in brightness in the gradation target is proportional to a path from the darkest portion. The brightest part is white,
The visual dynamic range measuring apparatus according to claim 1, wherein the darkest portion is black. The visual dynamic range measuring apparatus according to claim 3, wherein the brightest part exhibits white color by additive color mixture of light of a predetermined color. 5. The visual dynamic range measuring apparatus according to claim 1, wherein the display means can display the gradation target by changing the brightness of the background portion. The visual dynamic range measuring apparatus according to claim 1, wherein the control unit measures a response time of input by the subject. The visual dynamic range measuring apparatus according to claim 1, wherein the control unit measures ambient illuminance. 8. The visual dynamic range measurement according to claim 7, wherein the control unit corrects the visual dynamic range measurement value or the visual dynamic range related value based on a predetermined correction formula that is a function of the illuminance. apparatus. 9. The control unit according to claim 1, wherein the control unit determines whether the visual dynamic range measurement value or the visual dynamic range related value is within a predetermined range. Visual dynamic range measuring device. The input means receives at least one of the input of the brightest part assumed boundary and the input of the darkest part assumed boundary a plurality of times,
10. The control unit according to claim 1, wherein the control unit calculates an average value of at least one of a plurality of positions of the brightest part assumed boundary and a plurality of positions of the darkest part assumed boundary. The visual dynamic range measuring device according to claim 1. A gradation target display step for displaying a gradation target that is a target whose brightness changes stepwise from the brightest part to the darkest part,
Of the gradation target, the input of the assumed brightest part boundary that is the boundary between the part that is assumed to be the same as the brightest part in the subject and the part that is not the same, and the same as the darkest part in the subject An input receiving step for receiving at least one of an input of a darkest possible part boundary that is a boundary between a part that is assumed to be visible and a part that is not visible;
Visual dynamics for calculating a visual dynamic range measurement value or a visual dynamic range related value, which is a value related thereto, based on at least one of the position of the brightest part assumed boundary and the position of the darkest part assumed boundary A range calculation step;
A visual dynamic range measuring method characterized by comprising:

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