JP6883242B2 - Evaluation device, evaluation method, and evaluation program - Google Patents

Description

The present invention relates to an evaluation device, an evaluation method, and an evaluation program.

The corneal reflex method is known as one of the line-of-sight detection techniques. In the corneal reflex method, a subject is irradiated with infrared light emitted from a light source, the subject's eyes irradiated with infrared light are photographed with a camera, and the pupil of the corneal reflex image, which is a reflected image of the light source on the corneal surface. The position is detected to detect the subject's line of sight.

Various evaluations are performed using the results of detecting the line of sight of such a subject. For example, Patent Document 1 describes a technique for examining brain function by detecting eye movements.

Japanese Unexamined Patent Publication No. 2003-0384443

In recent years, it is said that the number of people with cranial nerve diseases such as dementia and persons with disabilities is increasing. In addition, it is required to detect such cranial nerve diseases / disorders at an early stage and quantitatively evaluate the severity of symptoms. For example, it is known that the symptoms of cranial nerve disease / disability affect the ability to follow. Therefore, it is required to evaluate the subject with high accuracy by measuring the tracking ability of the subject.

The present invention has been made in view of the above, and an object of the present invention is to provide an evaluation device, an evaluation method, and an evaluation program capable of evaluating a subject with high accuracy.

The evaluation device according to the present invention has the same appearance as the image data acquisition unit that acquires the image data of the subject's eyeball and the gaze point detection unit that detects the position data of the gaze point of the subject based on the image data. After displaying one of the plurality of objects as a specific object in a display mode different from that of the other objects on the display screen, the specific object is displayed in the same display mode as the other objects. A first display operation for displaying on the display screen, a second display operation for displaying a state in which a plurality of the objects move after performing the first display operation on the display screen in the same display mode, and the above. A third display operation that displays a state in which the movement of a plurality of the objects is stopped on the display screen in the same display mode after the second display operation is performed, a display control unit that performs a display operation including the second display operation, and the display screen. In the area setting unit that sets the corresponding area corresponding to the position of the specific object, and the gaze point exists in the corresponding area during the display period in which the display operation is performed based on the position data of the gaze point. A determination unit that determines whether or not the gaze point is present and outputs the determination data, and a calculation unit that calculates time data indicating the existence time of the gazing point in the corresponding area during the display period based on the determination data. An evaluation unit that obtains the evaluation data of the subject based on the time data and an output control unit that outputs the evaluation data are provided.

The evaluation method according to the present invention includes acquiring image data of the eyeball of a subject, detecting position data of the gazing point of the subject based on the image data, and for a plurality of objects having the same appearance. After displaying one said object as a specific object in a display mode different from that of the other objects on the display screen, the specific object is displayed on the display screen in the same display mode as the other objects. The first display operation is performed, the second display operation for displaying the state in which a plurality of the objects are moving after the first display operation is performed on the display screen in the same display mode, and the second display operation are performed. After that, a third display operation of displaying a state in which the movement of the plurality of objects is stopped on the display screen in the same display mode, a display operation including the display operation, and a position of the specific object on the display screen are performed. Based on the position data of the gazing point, it is determined whether or not the gazing point exists in the corresponding area during the display period in which the display operation is performed, and the determination data is determined. Is output, time data indicating the existence time of the gazing point in the corresponding region during the display period is calculated based on the determination data, and evaluation of the subject is performed based on the time data. It includes obtaining data and outputting the evaluation data.

The evaluation program according to the present invention includes a process of acquiring image data of the eyeball of a subject, a process of detecting position data of the gazing point of the subject based on the image data, and a plurality of objects having the same appearance. After displaying one said object as a specific object in a display mode different from that of the other objects on the display screen, the specific object is displayed on the display screen in the same display mode as the other objects. The first display operation is performed, the second display operation for displaying the state in which a plurality of the objects are moving after the first display operation is performed on the display screen in the same display mode, and the second display operation are performed. A third display operation for displaying a state in which the movement of the plurality of objects is stopped on the display screen in the same display mode, a process for performing a display operation including the operation, and a position of the specific object on the display screen. Based on the process of setting the corresponding area corresponding to the above and the position data of the gaze point, it is determined whether or not the gaze point exists in the corresponding area during the display period in which the display operation is performed, and the determination data is determined. The process of outputting the data, the process of calculating the time data indicating the existence time of the gazing point in the corresponding region during the display period based on the determination data, and the evaluation of the subject based on the time data. The computer is made to execute the process of obtaining the data and the process of outputting the evaluation data.

According to the present invention, it is possible to perform an evaluation using the line-of-sight detection result of a subject with high accuracy.

FIG. 1 is a perspective view schematically showing an example of the line-of-sight detection device according to the first embodiment. FIG. 2 is a diagram schematically showing the positional relationship between the display device, the stereo camera device, the lighting device, and the eyes of the subject according to the present embodiment. FIG. 3 is a diagram showing an example of the hardware configuration of the line-of-sight detection device according to the present embodiment. FIG. 4 is a functional block diagram showing an example of the line-of-sight detection device according to the present embodiment. FIG. 5 is a schematic diagram for explaining a method of calculating the position data of the center of curvature of the cornea according to the present embodiment. FIG. 6 is a schematic diagram for explaining a method of calculating the position data of the center of curvature of the cornea according to the present embodiment. FIG. 7 is a flowchart showing an example of the line-of-sight detection method according to the present embodiment. FIG. 8 is a schematic diagram for explaining an example of the calibration process according to the present embodiment. FIG. 9 is a flowchart showing an example of the calibration process according to the present embodiment. FIG. 10 is a schematic diagram for explaining an example of the gaze point detection process according to the present embodiment. FIG. 11 is a flowchart showing an example of the gaze point detection process according to the present embodiment. FIG. 12 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 13 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 14 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 15 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 16 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 17 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 18 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 19 is a diagram showing an example of an image displayed on the display device by the display control unit according to the present embodiment. FIG. 20 is a time chart showing the time when each video is displayed. FIG. 21 is a flowchart showing an example of the evaluation method according to the present embodiment. FIG. 22 is a diagram showing a modified example of the image displayed on the display device by the display control unit according to the present embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

In the following description, a three-dimensional global coordinate system is set and the positional relationship of each part is described. The direction parallel to the first axis of the predetermined surface is the X-axis direction, the direction parallel to the second axis of the predetermined surface orthogonal to the first axis is the Y-axis direction, and orthogonal to each of the first axis and the second axis. The direction parallel to the third axis is the Z-axis direction. The predetermined plane includes an XY plane.

<First Embodiment>
The first embodiment will be described. FIG. 1 is a perspective view schematically showing an example of the line-of-sight detection device 100 according to the present embodiment. In the present embodiment, the line-of-sight detection device 100 is used as an evaluation device for evaluating an object of interest of a subject.

As shown in FIG. 1, the line-of-sight detection device 100 includes a display device 101, a stereo camera device 102, and a lighting device 103.

The display device 101 includes a flat panel display such as a liquid crystal display (LCD) or an organic electroluminescence display (OLED). The display device 101 functions as a display unit.

In the present embodiment, the display screen 101S of the display device 101 is substantially parallel to the XY plane. The X-axis direction is the left-right direction of the display screen 101S, the Y-axis direction is the vertical direction of the display screen 101S, and the Z-axis direction is the depth direction orthogonal to the display screen 101S.

The stereo camera device 102 has a first camera 102A and a second camera 102B. The stereo camera device 102 is arranged below the display screen 101S of the display device 101. The first camera 102A and the second camera 102B are arranged in the X-axis direction. The first camera 102A is arranged in the −X direction with respect to the second camera 102B. Each of the first camera 102A and the second camera 102B includes an infrared camera, and has, for example, an optical system capable of transmitting near-infrared light having a wavelength of 850 [nm] and an imaging element capable of receiving the near-infrared light. ..

The lighting device 103 has a first light source 103A and a second light source 103B. The lighting device 103 is arranged below the display screen 101S of the display device 101. The first light source 103A and the second light source 103B are arranged in the X-axis direction. The first light source 103A is arranged in the −X direction with respect to the first camera 102A. The second light source 103B is arranged in the + X direction with respect to the second camera 102B. Each of the first light source 103A and the second light source 103B includes an LED (light emitting diode) light source, and can emit near-infrared light having a wavelength of, for example, 850 [nm]. The first light source 103A and the second light source 103B may be arranged between the first camera 102A and the second camera 102B.

FIG. 2 is a diagram schematically showing the positional relationship between the display device 101, the stereo camera device 102, the lighting device 103, and the eyeball 111 of the subject according to the present embodiment.

The illuminating device 103 emits near-infrared light, which is the detection light, to illuminate the eyeball 111 of the subject. The stereo camera device 102 photographs the eyeball 111 with the second camera 102B when the detection light emitted from the first light source 103A irradiates the eyeball 111, and the detection light emitted from the second light source 103B is emitted to the eyeball 111. When irradiated, the eyeball 111 is photographed by the first camera 102A.

A frame synchronization signal is output from at least one of the first camera 102A and the second camera 102B. The first light source 103A and the second light source 103B emit the detection light based on the frame synchronization signal. The first camera 102A acquires the image data of the eyeball 111 when the detection light emitted from the second light source 103B irradiates the eyeball 111. The second camera 102B acquires the image data of the eyeball 111 when the detection light emitted from the first light source 103A irradiates the eyeball 111.

When the eyeball 111 is irradiated with the detection light, a part of the detection light is reflected by the pupil 112, and the light from the pupil 112 is incident on the stereo camera device 102. When the eyeball 111 is irradiated with the detection light, a corneal reflex image 113, which is a virtual image of the cornea, is formed on the eyeball 111, and the light from the corneal reflex image 113 is incident on the stereo camera device 102.

By appropriately setting the relative positions of the first camera 102A and the second camera 102B and the first light source 103A and the second light source 103B, the intensity of the light incident on the stereo camera device 102 from the pupil 112 becomes low, and the corneal membrane The intensity of the light incident on the stereo camera device 102 from the reflected image 113 is increased. That is, the image of the pupil 112 acquired by the stereo camera device 102 has low brightness, and the image of the corneal reflex image 113 has high brightness. The stereo camera device 102 can detect the position of the pupil 112 and the position of the corneal reflex image 113 based on the brightness of the acquired image.

FIG. 3 is a diagram showing an example of the hardware configuration of the line-of-sight detection device 100 according to the present embodiment. As shown in FIG. 3, the line-of-sight detection device 100 includes a display device 101, a stereo camera device 102, a lighting device 103, a computer system 20, an input / output interface device 30, a drive circuit 40, and an output device 50. The input device 60 and the audio output device 70 are provided. The computer system 20 includes an arithmetic processing unit 20A and a storage device 20B.

The computer system 20, the drive circuit 40, the output device 50, the input device 60, and the audio output device 70 communicate data via the input / output interface device 30.

The arithmetic processing device 20A includes a microprocessor such as a CPU (central processing unit). The storage device 20B includes a memory or storage such as a ROM (read only memory) and a RAM (random access memory). The arithmetic processing unit 20A performs arithmetic processing according to the computer program 20C stored in the storage device 20B.

The drive circuit 40 generates a drive signal and outputs the drive signal to the display device 101, the stereo camera device 102, and the lighting device 103. Further, the drive circuit 40 supplies the image data of the eyeball 111 acquired by the stereo camera device 102 to the computer system 20 via the input / output interface device 30.

The output device 50 includes a display device such as a flat panel display. The output device 50 may include a printing device. The input device 60 generates input data by being operated. The input device 60 includes a keyboard or mouse for a computer system. The input device 60 may include a touch sensor provided on the display screen of the output device 50, which is a display device. The voice output device 70 includes a speaker, and outputs, for example, a voice for calling attention to the subject.

In the present embodiment, the display device 101 and the computer system 20 are separate devices. The display device 101 and the computer system 20 may be integrated. For example, when the line-of-sight detection device 100 includes a tablet-type personal computer, the tablet-type personal computer may be equipped with a computer system 20, an input / output interface device 30, a drive circuit 40, and a display device 101.

FIG. 4 is a functional block diagram showing an example of the line-of-sight detection device 100 according to the present embodiment. As shown in FIG. 4, the input / output interface device 30 has an input / output unit 302. The drive circuit 40 generates a display device drive unit 402 that generates a drive signal for driving the display device 101 and outputs the drive signal to the display device 101, and a first camera that generates a drive signal for driving the first camera 102A. The first camera input / output unit 404A that outputs to 102A, the second camera input / output unit 404B that generates a drive signal for driving the second camera 102B and outputs it to the second camera 102B, the first light source 103A, and the first light source 103A. It has a light source driving unit 406 that generates a drive signal for driving the two light source 103B and outputs the drive signal to the first light source 103A and the second light source 103B. Further, the first camera input / output unit 404A supplies the image data of the eyeball 111 acquired by the first camera 102A to the computer system 20 via the input / output unit 302. The second camera input / output unit 404B supplies the image data of the eyeball 111 acquired by the second camera 102B to the computer system 20 via the input / output unit 302.

The computer system 20 controls the line-of-sight detection device 100. The computer system 20 includes a display control unit 202, a light source control unit 204, an image data acquisition unit 206, an input data acquisition unit 208, a position detection unit 210, a curvature center calculation unit 212, and a gazing point detection unit 214. It has an area setting unit 216, a determination unit 218, a calculation unit 220, a storage unit 222, an evaluation unit 224, and an output control unit 226. The functions of the computer system 20 are exhibited by the arithmetic processing unit 20A and the storage device 20B.

The display control unit 202 distinguishes one object as a specific object from a plurality of objects having the same appearance in a display mode different from that of the other objects and displays the specific object on the display screen 101S, and then displays the specific object as another object. A first display operation for displaying on the display screen 101S in the same display mode as an object, and a second display for displaying a state in which a plurality of objects move after performing the first display operation on the display screen 101S in the same display mode. The operation, the third display operation of displaying the state in which the movement of the plurality of objects is stopped after the second display operation is performed on the display screen 101S in the same display mode, and the display operation including the operation are performed. The period during which a plurality of objects are displayed by the display operation is defined as the display period. The display control unit 202 displays, for example, an image to be shown to the subject on the display screen 101S of the display device 101. This video includes a scene in which a plurality of objects are displayed and a scene in which the plurality of objects are hidden. Therefore, the display control unit 202 performs the first display operation, the second display operation, and the third display operation on the display screen 101S by reproducing the video. In addition, this video includes a scene in which character information or the like for giving an instruction to the subject is displayed.

The light source control unit 204 controls the light source drive unit 406 to control the operating states of the first light source 103A and the second light source 103B. The light source control unit 204 controls the first light source 103A and the second light source 103B so that the first light source 103A and the second light source 103B emit the detected light at different timings.

The image data acquisition unit 206 acquires image data of the subject's eyeball 111 acquired by the stereo camera device 102 including the first camera 102A and the second camera 102B from the stereo camera device 102 via the input / output unit 302.

The input data acquisition unit 208 acquires the input data generated by operating the input device 60 from the input device 60 via the input / output unit 302.

The position detection unit 210 detects the position data at the center of the pupil based on the image data of the eyeball 111 acquired by the image data acquisition unit 206. Further, the position detection unit 210 detects the position data of the corneal reflex center based on the image data of the eyeball 111 acquired by the image data acquisition unit 206. The center of the pupil is the center of the pupil 112. The corneal reflex center is the center of the corneal reflex image 113. The position detection unit 210 detects the position data of the center of the pupil and the position data of the center of the corneal reflex for each of the left and right eyeballs 111 of the subject.

The curvature center calculation unit 212 calculates the position data of the corneal curvature center of the eyeball 111 based on the image data of the eyeball 111 acquired by the image data acquisition unit 206.

The gazing point detection unit 214 detects the position data of the gazing point of the subject based on the image data of the eyeball 111 acquired by the image data acquisition unit 206. In the present embodiment, the gazing point position data refers to the position data of the intersection of the subject's line-of-sight vector defined by the three-dimensional global coordinate system and the display screen 101S of the display device 101. The gazing point detection unit 214 detects the line-of-sight vectors of the left and right eyeballs 111 of the subject based on the position data of the center of the pupil and the position data of the center of curvature of the cornea acquired from the image data of the eyeballs 111. After the line-of-sight vector is detected, the gaze point detection unit 214 detects the position data of the gaze point indicating the intersection of the line-of-sight vector and the display screen 101S.

The area setting unit 216 sets the corresponding area corresponding to the position of the specific object on the display screen 101S of the display device 101. For example, in the first display period in which the first display operation is performed, the area setting unit 216 sets the corresponding area based on the display content of the specific object displayed on the display screen in a display mode different from that of other objects. Set. For example, when a display object different from the specific object is displayed in the first display operation, the area setting unit 216 can set the corresponding area so as to include the display object. The area setting unit 216 sets the corresponding area based on the locus of the moving specific object, for example, in the second display period in which the second display operation is performed. The area setting unit 216 can set a corresponding area in a range including a specific object in a stopped state, for example, in the third display period in which the third display operation is performed.

Based on the position data of the gazing point, the determination unit 218 determines whether or not the gazing point exists in a plurality of corresponding regions during the display period in which the display operation is performed, and outputs the determination data. The determination unit 218 determines, for example, whether or not the gazing point exists in the corresponding region at regular time intervals. The fixed time can be, for example, the period of the frame synchronization signal output from the first camera 102A and the second camera 102B (for example, every 50 [msec]).

Based on the determination data of the determination unit 218, the calculation unit 220 calculates time data indicating the existence time when the gazing point was in the corresponding region during the display period. The calculation unit 220 includes first time data indicating the existence time in the first display period in which the first display operation is performed, second time data indicating the existence time in the second display period in which the second display operation is performed, and second. 3 The third time data indicating the existence time in the third display period in which the display operation is performed and the third time data are calculated as time data.

The calculation unit 220 has a management timer that manages the reproduction time of the video, and a detection timer that detects the elapsed time since the video is displayed on the display screen 101S. Based on the detection result of the detection timer, the calculation unit 220 can detect which period of the video displayed on the display screen 101S is the video of a plurality of periods (see periods T1 to T7 in FIG. 20) in the time chart. Is. In addition, the calculation unit 220 counts the number of determinations that it is determined that the gazing point exists in the corresponding area. The calculation unit 220 has a counter that counts the number of determinations for the corresponding area.

The evaluation unit 224 obtains the evaluation data of the subject based on at least the time data. The evaluation data is data indicating how much the subject is tracking the specific object among the plurality of objects displayed on the display screen 101S in the display operation.

The storage unit 222 stores the above-mentioned determination data, time data, and evaluation data. Further, the storage unit 222 has a process of acquiring image data of the subject's eyeball, a process of detecting position data of the subject's gazing point based on the image data, and one object for a plurality of objects having the same appearance. The first display operation of displaying an object as a specific object in a display mode different from that of other objects and then displaying the specific object on the display screen in the same display mode as other objects, and the first display operation. 1 A second display operation in which a state in which a plurality of objects move after performing a display operation is displayed on a display screen in the same display mode, and a state in which movement of a plurality of objects stops after the second display operation is performed. The third display operation of displaying the data on the display screen in the same display mode, the process of performing the display operation including the display operation, the process of setting the corresponding area corresponding to the position of the specific object on the display screen, and the position data of the gazing point. Based on the above, it is determined whether or not the gaze point exists in the corresponding area during the display period in which the display operation is performed, and the judgment data is output. Based on the judgment data, the gaze point is in the corresponding area during the display period. Stores an evaluation program that causes a computer to execute a process of calculating time data indicating the existence time existing in, a process of obtaining evaluation data of a subject based on the time data, and a process of outputting evaluation data.

The output control unit 226 outputs data to at least one of the display device 101, the output device 50, and the audio output device 70. In the present embodiment, the output control unit 226 causes the display device 101 or the output device 50 to display the time data calculated by the calculation unit 220. Further, the output control unit 226 causes the display device 101 or the output device 50 to display the position data of the gazing points of the left and right eyeballs 111 of the subject. Further, the output control unit 226 causes the display device 101 or the output device 50 to display the evaluation data output from the evaluation unit 224.

Next, an outline of the processing of the curvature center calculation unit 212 according to the present embodiment will be described. The curvature center calculation unit 212 calculates the position data of the corneal curvature center of the eyeball 111 based on the image data of the eyeball 111.

5 and 6 are schematic views for explaining a method of calculating the position data of the corneal curvature center 110 according to the present embodiment. FIG. 5 shows an example in which the eyeball 111 is illuminated by one light source 103C. FIG. 6 shows an example in which the eyeball 111 is illuminated by the first light source 103A and the second light source 103B.

First, an example shown in FIG. 5 will be described. The light source 103C is arranged between the first camera 102A and the second camera 102B. The pupil center 112C is the center of the pupil 112. The corneal reflex center 113C is the center of the corneal reflex image 113. In FIG. 5, the pupil center 112C indicates the pupil center when the eyeball 111 is illuminated by one light source 103C. The corneal reflex center 113C indicates the corneal reflex center when the eyeball 111 is illuminated by one light source 103C.

The corneal reflex center 113C exists on a straight line connecting the light source 103C and the corneal curvature center 110. The corneal reflex center 113C is positioned at the midpoint between the corneal surface and the corneal curvature center 110. The corneal curvature radius 109 is the distance between the corneal surface and the corneal curvature center 110.

The position data of the corneal reflex center 113C is detected by the stereo camera device 102. The corneal curvature center 110 exists on a straight line connecting the light source 103C and the corneal reflection center 113C. The curvature center calculation unit 212 calculates the position data in which the distance from the corneal reflection center 113C is a predetermined value on the straight line as the position data of the corneal curvature center 110. The predetermined value is a value predetermined from a general corneal radius of curvature value or the like, and is stored in the storage unit 222.

Next, an example shown in FIG. 6 will be described. In the present embodiment, the first camera 102A and the second light source 103B and the second camera 102B and the first light source 103A are symmetrical with respect to a straight line passing through an intermediate position between the first camera 102A and the second camera 102B. Is placed at the position of. It can be considered that the virtual light source 103V exists at an intermediate position between the first camera 102A and the second camera 102B.

The corneal reflex center 121 indicates the corneal reflex center in the image of the eyeball 111 taken by the second camera 102B. The corneal reflex center 122 indicates the corneal reflex center in the image of the eyeball 111 taken by the first camera 102A. The corneal reflex center 124 indicates a corneal reflex center corresponding to the virtual light source 103V.

The position data of the corneal reflex center 124 is calculated based on the position data of the corneal reflex center 121 and the position data of the corneal reflex center 122 acquired by the stereo camera device 102. The stereo camera device 102 detects the position data of the corneal reflex center 121 and the position data of the corneal reflex center 122 in the three-dimensional local coordinate system defined by the stereo camera device 102. The stereo camera device 102 is calibrated in advance by a stereo calibration method, and conversion parameters for converting the three-dimensional local coordinate system of the stereo camera device 102 into a three-dimensional global coordinate system are calculated. The conversion parameter is stored in the storage unit 222.

The curvature center calculation unit 212 converts the position data of the corneal reflex center 121 and the position data of the corneal reflex center 122 acquired by the stereo camera device 102 into position data in the three-dimensional global coordinate system using conversion parameters. The curvature center calculation unit 212 calculates the position data of the corneal reflex center 124 in the three-dimensional global coordinate system based on the position data of the corneal reflex center 121 and the position data of the corneal reflex center 122 defined in the three-dimensional global coordinate system. To do.

The corneal curvature center 110 exists on a straight line 123 connecting the virtual light source 103V and the corneal reflection center 124. The curvature center calculation unit 212 calculates the position data at which the distance from the corneal reflex center 124 is a predetermined value on the straight line 123 as the position data of the corneal curvature center 110. The predetermined value is a value predetermined from a general corneal radius of curvature value or the like, and is stored in the storage unit 222.

In this way, even when there are two light sources, the corneal curvature center 110 is calculated by the same method as when there is one light source.

The corneal curvature radius 109 is the distance between the corneal surface and the corneal curvature center 110. Therefore, the corneal curvature radius 109 is calculated by calculating the position data of the corneal surface and the position data of the corneal curvature center 110.

[Gaze detection method]
Next, an example of the line-of-sight detection method according to the present embodiment will be described. FIG. 7 is a flowchart showing an example of the line-of-sight detection method according to the present embodiment. In the present embodiment, the calibration process (step S100) including the calculation process of the position data of the corneal curvature center 110 and the calculation process of the distance data between the pupil center 112C and the corneal curvature center 110, and the gaze point detection process (step S200). ) Is implemented.

(Calibration process)
The calibration process (step S100) will be described. FIG. 8 is a schematic diagram for explaining an example of the calibration process according to the present embodiment. The calibration process includes calculating the position data of the corneal curvature center 110 and calculating the distance 126 between the pupil center 112C and the corneal curvature center 110.

A target position 130 is set for the subject to gaze. The target position 130 is defined in the three-dimensional global coordinate system. In the present embodiment, the target position 130 is set, for example, at the center position of the display screen 101S of the display device 101. The target position 130 may be set at the end position of the display screen 101S.

The display control unit 202 causes the target image to be displayed at the set target position 130. This makes it easier for the subject to gaze at the target position 130.

The straight line 131 is a straight line connecting the virtual light source 103V and the corneal reflection center 113C. The straight line 132 is a straight line connecting the target position 130 and the pupil center 112C. The center of curvature 110 of the cornea is the intersection of the straight line 131 and the straight line 132. The curvature center calculation unit 212 is based on the position data of the virtual light source 103V, the position data of the target position 130, the position data of the pupil center 112C, and the position data of the corneal reflection center 113C, and the position data of the corneal curvature center 110. Can be calculated.

FIG. 9 is a flowchart showing an example of the calibration process (step S100) according to the present embodiment. The output control unit 226 displays the target image on the display screen 101S of the display device 101 (step S101). The subject can gaze at the target position 130 by gazing at the target image.

Next, the light source control unit 204 controls the light source drive unit 406 to emit the detected light from one of the first light source 103A and the second light source 103B (step S102). The stereo camera device 102 photographs the eyes of the subject with the camera of the first camera 102A and the second camera 102B, whichever has the longer distance from the light source that emits the detected light (step S103).

Next, the light source control unit 204 controls the light source drive unit 406 to emit the detected light from the other light source of the first light source 103A and the second light source 103B (step S104). The stereo camera device 102 photographs the eyes of the subject with the camera of the first camera 102A and the second camera 102B, whichever has the longer distance from the light source that emits the detected light (step S105).

The pupil 112 is detected by the stereo camera device 102 as a dark portion, and the corneal reflection image 113 is detected by the stereo camera device 102 as a bright portion. That is, the image of the pupil 112 acquired by the stereo camera device 102 has low brightness, and the image of the corneal reflex image 113 has high brightness. The position detection unit 210 can detect the position data of the pupil 112 and the position data of the corneal reflex image 113 based on the brightness of the acquired image. Further, the position detection unit 210 calculates the position data of the pupil center 112C based on the image data of the pupil 112. Further, the position detection unit 210 calculates the position data of the corneal reflex center 113C based on the image data of the corneal reflex image 113 (step S106).

The position data detected by the stereo camera device 102 is the position data defined by the three-dimensional local coordinate system. The position detection unit 210 uses the conversion parameters stored in the storage unit 222 to coordinate-convert the position data of the pupil center 112C and the position data of the corneal reflection center 113C detected by the stereo camera device 102 to perform a three-dimensional transformation. The position data of the pupil center 112C and the position data of the corneal reflection center 113C defined by the original global coordinate system are calculated (step S107).

The curvature center calculation unit 212 calculates a straight line 131 connecting the corneal reflection center 113C defined by the global coordinate system and the virtual light source 103V (step S108).

Next, the curvature center calculation unit 212 calculates a straight line 132 connecting the target position 130 defined on the display screen 101S of the display device 101 and the pupil center 112C (step S109). The curvature center calculation unit 212 obtains an intersection of the straight line 131 calculated in step S108 and the straight line 132 calculated in step S109, and sets this intersection as the corneal curvature center 110 (step S110).

The curvature center calculation unit 212 calculates the distance 126 between the pupil center 112C and the corneal curvature center 110 and stores it in the storage unit 222 (step S111). The stored distance is used to calculate the corneal curvature center 110 in the gaze point detection process in step S200.

(Gaze point detection process)
Next, the gazing point detection process (step S200) will be described. The gazing point detection process is performed after the calibration process. The gaze point detection unit 214 calculates the gaze vector of the subject and the position data of the gaze point based on the image data of the eye 111.

FIG. 10 is a schematic diagram for explaining an example of the gaze point detection process according to the present embodiment. In the gazing point detection process, the position of the corneal curvature center 110 is corrected by using the distance 126 between the pupil center 112C and the corneal curvature center 110 obtained in the calibration process (step S100), and the corrected corneal curvature center 110 is used. Includes calculating the gaze point using 110 position data.

In FIG. 10, the gazing point 165 indicates a gazing point obtained from the center of curvature of the cornea calculated using a general radius of curvature value. The gazing point 166 indicates a gazing point obtained from the center of curvature of the cornea calculated using the distance 126 obtained in the calibration process.

The pupil center 112C indicates the pupil center calculated in the calibration process, and the corneal reflex center 113C indicates the corneal reflex center calculated in the calibration process.

The straight line 173 is a straight line connecting the virtual light source 103V and the corneal reflection center 113C. The corneal curvature center 110 is the position of the corneal curvature center calculated from a general radius of curvature value.

The distance 126 is the distance between the pupil center 112C and the corneal curvature center 110 calculated by the calibration process.

The corneal curvature center 110H indicates the position of the corrected corneal curvature center after the corneal curvature center 110 is corrected using the distance 126.

The corneal curvature center 110H is obtained because the corneal curvature center 110 exists on the straight line 173 and the distance between the pupil center 112C and the corneal curvature center 110 is 126. As a result, the line-of-sight 177 calculated when a general radius of curvature value is used is corrected to the line-of-sight 178. Further, the gazing point on the display screen 101S of the display device 101 is corrected from the gazing point 165 to the gazing point 166.

FIG. 11 is a flowchart showing an example of the gaze point detection process (step S200) according to the present embodiment. Since the processing from step S201 to step S207 shown in FIG. 11 is the same as the processing from step S102 to step S108 shown in FIG. 9, the description thereof will be omitted.

The curvature center calculation unit 212 calculates the corneal curvature center 110H at a position on the straight line 173 calculated in step S207 where the distance from the pupil center 112C is equal to the distance 126 obtained by the calibration process (step S208).

The gazing point detection unit 214 calculates a line-of-sight vector connecting the pupil center 112C and the corneal curvature center 110H (step S209). The line-of-sight vector indicates the line-of-sight direction that the subject is looking at. The gazing point detection unit 214 calculates the position data of the intersection of the line-of-sight vector and the display screen 101S of the display device 101 (step S210). The position data of the intersection of the line-of-sight vector and the display screen 101S of the display device 101 is the position data of the gazing point of the subject on the display screen 101S defined by the three-dimensional global coordinate system.

The gazing point detection unit 214 converts the gazing point position data defined by the three-dimensional global coordinate system into the position data on the display screen 101S of the display device 101 defined by the two-dimensional coordinate system (step S211). As a result, the position data of the gazing point on the display screen 101S of the display device 101 that the subject looks at is calculated.

Next, the evaluation method according to this embodiment will be described. In the present embodiment, the line-of-sight detection device 100 is used, for example, as an evaluation device for evaluating the tracking ability of a subject. In the following description, the line-of-sight detection device 100 may be appropriately referred to as an evaluation device 100.

FIG. 12 is a diagram showing an example of an image displayed on the display device 101 by the display control unit 202. As shown in FIG. 12, the display control unit 202 causes the display screen 101S of the display device 101 to display a plurality of objects M. In the present embodiment, for example, three objects M are displayed as a plurality of objects M. Hereinafter, when the three objects M are described, they may be described as objects M1, M2, and M3. The number of objects M displayed on the display screen 101S is not limited to three, and may be two or four or more. The display control unit 202 displays the objects M1 to M3 on the display screen 101S, for example, in a state of being separated from each other.

The objects M1 to M3 are, for example, cups having an opening facing downward, but are not limited to this, and may be other articles. The objects M1 to M3 have the same appearance. That is, the objects M1 to M3 are displayed in the same state in shape, size, color, posture, and the like. Therefore, the objects M1 to M3 are displayed in an indistinguishable state when viewed from the subject.

Further, the display control unit 202 may display an instruction to the subject in an area along the upper side of the display screen 101S, for example. The instruction to the subject is, for example, when instructing to see the display when the specific object M0 is displayed separately from other objects in a display mode, or when the objects M1 to M3 move. When instructing to follow the specific object M0, etc., the content of each instruction is displayed in sentences or the like.

Further, FIG. 12 shows an example of a gazing point where the output control unit 226 displays, for example, the result after measurement on the display screen 101S. The output control unit 226 causes the display device 101 to display the plot point P indicating the position data of the gazing point of the subject. The detection of the position data of the gazing point is performed, for example, in the cycle of the frame synchronization signal output from the first camera 102A and the second camera 102B (for example, every 50 [msec]). The first camera 102A and the second camera 102B take images in synchronization with each other. Therefore, in the display screen 101S, the area where the plot points P are denser indicates that the subject is gazing. Further, the larger the number of plot points P, the longer the time for the subject to gaze at the area.

Symptoms of cranial nerve diseases and disabilities are known to affect tracking ability. When the subject is not a person with a cranial nerve disease or a disability, a plurality of objects M1 to M3 are shown in a state of being moved to the display screen 101S, and one of the objects M is made to follow (follow) the gazing point. When instructed, the one object M can be followed up. On the other hand, when the subject is a person with a cranial nerve disease or a disability, a plurality of objects M1 to M3 are shown in a state of being moved to the display screen 101S, and one of the objects M is instructed to follow. , The one object M may not be closely watched.

Therefore, it is possible to evaluate the subject by performing the following procedure, for example. First, the subject is made to store one object M as a specific object in a state where a plurality of objects M are displayed on the display screen 101S. After that, a plurality of objects M are displayed on the display screen 101S in a moved state, and the subject is instructed to follow the specific object. That is, the subject is instructed to move the line of sight according to the movement of the specific object and keep the line of sight on the specific object. In this case, it is possible to evaluate the subject by detecting whether the subject can follow the specific object.

13 to 19 are diagrams showing an example of an image displayed on the display screen 101S by the display control unit 202 according to the present embodiment. FIG. 20 is a time chart showing a period in which each image is displayed. When the video is reproduced by the display control unit 202, the first display operation is first performed. In the first display operation, one of the objects M1 to M3 is displayed on the display screen 101S as the specific object M0 in a display mode different from that of the other objects M, and then the specific object M0 is displayed. Is displayed on the display screen 101S in the same display mode as the other object M. In the present embodiment, the case where the object M2 is set as the specific object M0 among the objects M1 to M3 will be described as an example. The same explanation can be made when any of the objects M1 and M3 is set as the specific object M0.

As shown in FIG. 13, in the first display operation, the objects M1 to M3 are first displayed, and the specific object M0 is displayed on the display screen 101S in a display mode different from that of the other objects M1 and M3. .. In FIG. 13, the specific object M0 performs an operation of shielding the coin C which is a shielded object, and the other objects M1 and M3 are displayed in a stationary state for a predetermined period (period T1 in FIG. 20). With this display, the subject can intuitively recognize the specific object M0. In the period T1, in order to store the specific object M0 in the subject, an instruction such as "remember the specific object M0" may be displayed on the display screen 101S. In the period T1, the area setting unit 216 sets the corresponding area A corresponding to the specific object M0, although it is not displayed on the display screen 101S. Hereinafter, the corresponding area A set in the period T1 may be referred to as the corresponding area A1. The corresponding area A1 is set to a range including, for example, the specific object M0 and the coin C.

In the first display operation, after the period T1 elapses, as shown in FIG. 14, the specific object M0 is displayed on the display screen 101S in the same display mode as the other objects M1 and M3 (the period T2 in FIG. 20). )Is displayed. For example, after the specific object M0 shields the coin C, it is displayed on the display screen 101S in a state indistinguishable from the other objects M1 and M3. In the period T2, an instruction such as "Please pay attention to the specific object M0" may be displayed on the display screen 101S so as to align the line of sight with the specific object M0. In the period T2, the area setting unit 216 sets the corresponding area A corresponding to the specific object M0, although it is not displayed on the display screen 101S. Hereinafter, the corresponding area A set in the period T2 may be referred to as the corresponding area A2. Since the coin C is not displayed in the period T2, the range is different between the corresponding area A1 and the corresponding area A2. In the first display period, the output control unit 226 may display the plot point P indicating the position data of the gazing point of the subject on the display screen 101S. In this way, the first display operation is completed.

After the first display operation is completed, the second display operation is subsequently performed. In the second display operation, as shown in FIGS. 15 to 17, the moving states of the objects M1 to M3 are displayed on the display screen 101S for a predetermined period (periods T3 to T5 in FIG. 20) in the same display mode. In this case, the specific object M0 is displayed on the display screen 101S in a state in which it is indistinguishable from the other objects M1 and M3. In the second display period (periods T3 to T5) in which the second display operation is performed, for example, "Please follow the specific object M0" or the like so as to keep the line of sight on the moving specific object M0. The instruction may be displayed on the display screen 101S. Each period T3, T4, T5 of the second display period can be set as a period equal to each other. It should be noted that all of the objects M1 to M3 do not necessarily have to move. For example, the object M2 in which the specific object M0 is set may not move, and only the object M1 and the object M3 may move. In the following, it will be described that all of the objects M1 to M3 move.

In the second display period, the area setting unit 216 sets the corresponding area A corresponding to the specific object M0, although it is not displayed on the display screen 101S. The area setting unit 216 can set the corresponding area A based on, for example, the locus of the moving specific object M0. In this case, the area setting unit 216 may set the corresponding area A for each period.

For example, as shown in FIG. 15, the area setting unit 216 sets the corresponding area A in the range including the locus of the specific object M0 in the period T3. In this case, the corresponding region A is formed in a state of extending in the vertical direction in the vicinity of the central portion in the horizontal direction in the drawing of the display screen 101S corresponding to the locus of the specific object M0. Hereinafter, the corresponding area A set in the period T3 may be referred to as the corresponding area A3.

When the display period is switched from the period T3 to the period T4, the area setting unit 216 sets the corresponding area A in the range including the locus of the specific object M0 in the period T4 as shown in FIG. In this case, the corresponding region A is formed in a state of extending in the left-right direction in the upper left of the figure of the display screen 101S corresponding to the locus of the specific object M0. Hereinafter, the corresponding area A set in the period T4 may be referred to as the corresponding area A4.

When the display period is switched from the period T4 to the period T5, the area setting unit 216 sets the corresponding area A5 in the range including the locus of the specific object M0 in the period T5, as shown in FIG. In this case, the corresponding region A is formed in a state of extending in the vertical direction on the left side in the drawing of the display screen 101S corresponding to the locus of the specific object M0. Hereinafter, the corresponding area A set in the period T5 may be referred to as the corresponding area A5.

In the second display period, the movement routes of the objects M1 to M3 are set so as not to overlap each other, for example. The area setting unit 216 can set the corresponding areas A3 to A5 according to the locus of the specific object M0 by acquiring the information on the movement route of the set specific object M0. In this way, the area setting unit 216 can change the range of the corresponding area A depending on the periods T3, T4, and T5. In the second display period, the output control unit 226 may display the plot point P indicating the position data of the gazing point of the subject on the display screen 101S. In this way, the second display operation is completed.

After the second display operation is completed, the third display operation is subsequently performed. In the third display operation, as shown in FIG. 18, the state in which the movement of the objects M1 to M3 is stopped is displayed on the display screen 101S for a predetermined period (period T6 in FIG. 20) in the same display mode. Even in this case, the specific object M0 is displayed on the display screen 101S in a state in which it is indistinguishable from the other objects M1 and M3. In the period T6, an instruction such as "Please pay attention to the specific object M0" may be displayed on the display screen 101S so as to keep the line of sight on the specific object M0 that has stopped moving. In the third display period (period T6) in which the third display operation is performed, the area setting unit 216 sets the corresponding area A corresponding to the specific object M0, although it is not displayed on the display screen 101S. Hereinafter, the corresponding area A set in the period T6 may be referred to as the corresponding area A6. The corresponding area A6 is set in a range surrounding the specific object M0. In the third display period, the output control unit 226 may display the plot point P indicating the position data of the gazing point of the subject on the display screen 101S. In this way, the third display operation is completed. When the third display operation is completed, the area setting unit 216 cancels the setting of the corresponding area A6. As a result, the corresponding area A is not set on the display screen 101S. Therefore, when the display period is switched to the periods T1, T2, T3, T4, T5, and T6, the area setting unit 216 displays the corresponding area A on the display screen 101S, and the corresponding areas A1, A2, A3, and A4, respectively. Set by switching between A5 and A6.

After the third display operation is completed, the fourth display operation is continuously performed. In the fourth display operation, the specific object M0 is distinguished from the other objects M1 and M3 in a display mode and displayed on the display screen 101S. For example, as shown in FIG. 19, a state in which the coin C appears by raising the specific object M0 is displayed. This makes it possible to intuitively inform the subject of the position of the specific object M0 after movement. In this way, the fourth display operation is completed. After the period T7 of the fourth display operation elapses, the reproduction of the video ends. In the period T7, the fact that the video has ended may be displayed on the display screen 101S.

When the subject is not a person with a cranial nerve disease or a disability, and is instructed to follow the specific object M0, which is one of the objects M1 to M3, the viewpoint can be adjusted by following the specific object M0. On the other hand, when the subject is a person with a cranial nerve disease or a disability, when instructed to follow the specific object M0 of one of the objects M1 to M3, the line of sight may be adjusted following the specific object M0. There are things you can't do.

In the first display period to the third display period (periods T1 to T6), the determination unit 218 determines whether or not the gazing point exists in the corresponding region A, and outputs the determination data. Further, the calculation unit 220 indicates the time during which the plot point P indicating the gazing point exists in the corresponding region A based on the determination data in the first display period to the third display period (periods T1 to T6). Calculate the data. In the present embodiment, the time data includes, for example, the first time data indicating the time when the gazing point exists in the corresponding areas A1 and A2 in the first display period (periods T1 and T2), and the second display period (periods T3 to T5). ), The second time data indicating the time when the gazing point exists in the corresponding areas A3 to A5, and the third time data indicating the time when the gazing point exists in the corresponding area A6 in the third display period (period T6). Including.

Further, in the present embodiment, it can be estimated that the greater the number of times the determination unit 218 determines that the gaze point exists, the longer the gaze point exists in the corresponding region A. Therefore, in the present embodiment, the time data can be, for example, the number of times that the determination unit 218 determines that the gazing point exists in the corresponding area A within the display period. That is, the time data can be the number of plot points P detected in the corresponding area A within the display period. The calculation unit 220 can calculate the time data by using the count result of the counter provided in the determination unit 218.

In the present embodiment, when the evaluation unit 224 obtains the evaluation data based on the time data, it can be performed as follows, for example.

First, the counter provided in the calculation unit 220 counts the first hour data in the first display period, counts the second hour data in the second display period, and counts the third hour data in the third display period. Here, the counter value of the first time data is set to CTAN, the counter value of the second time data is set to CNTB, and the counter value of the third time data is set to CNTC.

In this case, the evaluation unit 224 can obtain the evaluation value for obtaining the evaluation data as follows. For example, the evaluation value can be obtained by determining the length of time that the subject's gazing point has existed in the corresponding region A. When the subject keeps looking at the specific object M0 following the specific object M0, the time for gazing at the corresponding region A becomes longer. In the first display period, the longer the gaze point existing in the corresponding areas A1 and A2, the larger the counter value CNTA value. In the second display period, the longer the gaze point existing in the corresponding areas A3 to A5, the larger the counter value CNTB value. In the third display period, the longer the gaze point existing in the corresponding area A6 is, the larger the counter value CNTC value becomes. Therefore, the evaluation value can be obtained by determining whether or not the total value of the counter values CNTA, CNTB, and CNTC is equal to or greater than a predetermined value. For example, when the total value of the counter values CNTA, CNTB, and CNTC is equal to or higher than a predetermined value, it can be evaluated that the subject is unlikely to have a cranial nerve disease / disability. In addition, when the total value of the counter values CNTA, CNTB, and CNTC is less than a predetermined value, it can be evaluated that the subject is highly likely to have a cranial nerve disease / disability.

As the predetermined value, for example, the average value of the counter values CNTA, CNTB, and CNTC of a subject who is not a cranial nerve disease / disabled person, or a value set based on the average value can be used. Further, as a predetermined value, for example, the lowest counter values of CNTA, CNTB, and CNTC of a subject who is not a cranial nerve disease / disabled person may be used. In this case, a predetermined value may be set in advance for each age and gender, and a value corresponding to the age and gender of the subject may be used.

Further, the evaluation unit 224 can obtain the evaluation value ANS by, for example, the following equation (1).

ANS = (K1 x CNTA) + (K2 x CNTB) + (K3 x CNTC) ... (1)

In the above equation (1), the constants K1, K2, and K3 are constants for weighting. For the constants K1, K2, and K3, for example, K1, K2 <K3 can be set. In this case, it is possible to obtain the evaluation value ANS in which the influence of the third time data is weighted rather than the influence of the first time data and the second time data.

Further, for the constants K1, K2, and K3, for example, K1 <K2 <K3 can be set. In this case, it is possible to obtain the evaluation value ANS in which the influence of the second time data is weighted more than the influence of the first time data, and the influence of the third time data is weighted more than the influence of the second time data. .. If the viewpoint can be focused on the specific object M0 in the third display period, it is highly probable that the specific object M0 was closely watched even in the first display period and the second display period up to that point. Therefore, the evaluation data can be efficiently obtained by weighting the third time data and obtaining the evaluation value. The constants K1, K2, and K3 may be set to equal values (for example, 1), and the evaluation value ANS may be obtained without weighting. In this way, by obtaining the evaluation data based on the first time data, the second time data, and the third time data, the tracking ability in the first display operation, the tracking ability in the second display operation, and the third display It is possible to subdivide and evaluate the tracking ability in motion.

Next, an example of the evaluation method according to the present embodiment will be described with reference to FIG. FIG. 21 is a flowchart showing an example of the evaluation method according to the present embodiment. In the present embodiment, the display control unit 202 starts the reproduction of the video (step S301). The images shown in FIGS. 13 to 19 are sequentially displayed on the display screen 101S.

Further, the calculation unit 220 includes a management timer that manages the playback time of the video, and a detection timer that detects which period the currently played video belongs to among the periods T1 to T7 in the time chart shown in FIG. Is reset to start each measurement (step S302). Further, the determination unit 218 resets the counter values CNTA, CNTB, and CNTC to 0, respectively, and starts the measurement (step S303).

The gazing point detection unit 214 displays the image displayed on the display device 101 to the subject, and at every predetermined sampling cycle (for example, 50 [msec]), the gazing point of the subject on the display screen 101S of the display device 101. The position data is detected (step S304).

When the position data is detected (No in step S305), the calculation unit 220 determines whether or not the display period is the period T1 or T2 based on the detection result of the detection timer (step S306). When it is determined that the display period is the period T1 or T2 (Yes in step S306), the area setting unit 216 sets the corresponding area A1 corresponding to the period T1 and the corresponding area A2 corresponding to the period T2, respectively (step). S307). After the corresponding areas A1 and A2 are set, the determination unit 218 determines whether or not the gazing point of the subject exists in the corresponding areas A1 and A2, and outputs the determination data (step S308). When the determination unit 218 determines that the gazing point exists in the corresponding areas A1 and A2 (Yes in step S308), the calculation unit 220 sets the counter value CTAN to +1 (step S309). When the determination unit 218 determines that the gazing point does not exist in the corresponding areas A1 and A2 (No in step S308), the calculation unit 220 does not change the counter value CTAN.

When it is determined that the display period is not the period T1 or T2 (No in step S306), the calculation unit 220 determines whether or not the display period is the period T3 to T5 based on the detection result of the detection timer (No). Step S310). When it is determined that the display period is the period T3 to T5 (Yes in step S310), the area setting unit 216 corresponds to the corresponding area A3 corresponding to the period T3, the corresponding area A4 corresponding to the period T4, and the period T5. Corresponding areas A5 are set respectively (step S311). After the corresponding areas A3 to A5 are set, the determination unit 218 determines whether or not the gazing point of the subject exists in the corresponding areas A3 to A5 and outputs the determination data (step S312). When the determination unit 218 determines that the gazing point exists in the corresponding areas A3 to A5 (Yes in step S312), the calculation unit 220 sets the counter value CNTB to +1 (step S313). When the determination unit 218 determines that the gazing point does not exist in the corresponding areas A3 to A5 (No in step S312), the calculation unit 220 does not change the counter value CNTB.

When it is determined that the display period is not the period T3 to T5 (No in step S310), the calculation unit 220 determines whether or not the display period is the period T6 based on the detection result of the detection timer (step S314). ). When it is determined that the display period is the period T6 (Yes in step S314), the area setting unit 216 sets the corresponding area A6 corresponding to the period T6 (step S315). After the corresponding area A6 is set, the determination unit 218 determines whether or not the gazing point of the subject exists in the corresponding area A6 and outputs the determination data (step S316). When the determination unit 218 determines that the gazing point exists in the corresponding region A6 (Yes in step S316), the calculation unit 220 sets the counter value CNTC to +1 (step S317). When the determination unit 218 determines that the gazing point does not exist in the corresponding region A6 (No in step S316), the calculation unit 220 does not change the counter value CNTC.

When it is determined that the display period is not the period T6 (No in step S314), or any of the above-mentioned No in step S308, step S309, No in step S312, No in step S313, No in step S316, and step S317. After the processing is performed, the calculation unit 220 determines whether or not the time for completing the reproduction of the video has been reached based on the detection result of the management timer (step S318). When the calculation unit 220 determines that the time at which the reproduction of the video is completed has not been reached (No in step S318), the processes after step S304 are repeated.

When the calculation unit 220 determines that the time at which the video reproduction is completed has been reached (Yes in step S318), the display control unit 202 stops the video reproduction (step S319). After the reproduction of the video is stopped, the evaluation unit 224 calculates the evaluation value ANS based on the time data obtained from the above processing result (step S320), and obtains the evaluation data based on the evaluation value ANS. After that, the output control unit 226 outputs the evaluation data obtained by the evaluation unit 224 (step S321).

As described above, the evaluation device 100 according to the present embodiment has the image data acquisition unit 206 that acquires the image data of the subject's eyeball, and the gaze point detection that detects the position data of the gaze point of the subject based on the image data. For a plurality of objects M having the same appearance as the unit 214, one object M is designated as a specific object M0 and displayed on the display screen 101S in a display mode different from that of the other objects M, and then the specific object M0 is displayed. The first display operation of displaying on the display screen 101S in the same display mode as the other object M and the state in which a plurality of objects M move after performing the first display operation are displayed on the display screen 101S in the same display mode. A second display operation for displaying, a third display operation for displaying a state in which the movement of a plurality of objects M is stopped after the second display operation is performed on the display screen 101S in the same display mode, and a display operation including the second display operation are performed. Note to the display control unit 202, the area setting unit 216 that sets the corresponding area A corresponding to the position of the specific object M0 on the display screen 101S, and the display period in which the display operation is performed based on the position data of the gazing point. Judgment unit 218 that determines whether or not the viewpoint exists in the corresponding area A and outputs the judgment data, and time data indicating the existence time of the gazing point in the corresponding area A during the display period based on the judgment data. It is provided with a calculation unit 220 for calculating the above, an evaluation unit 224 for obtaining the evaluation data of the subject based on the time data, and an output control unit 226 for outputting the evaluation data.

With this configuration, time data in which the gaze point of the subject exists in the corresponding area A during the display period is obtained, and evaluation data of the subject is obtained based on the time data. Therefore, the evaluation device 100 can evaluate the tracking ability of the subject based on the movement of the subject's line of sight during the display period. As a result, the evaluation device 100 can evaluate the subject with high accuracy.

Further, in the evaluation device 100 according to the present embodiment, the calculation unit 220 has the first time data indicating the existence time in the first display period (periods T1 and T2) in which the first display operation is performed, and the second display operation. The second time data indicating the existence time in the second display period (period T3 to T5) performed and the third time data indicating the existence time in the third display period (period T6) in which the third display operation is performed are displayed. After calculation, the evaluation unit 224 obtains evaluation data based on the first time data, the second time data, and the third time data. Thereby, the tracking ability in the first display operation, the tracking ability in the second display operation, and the tracking ability in the third display operation can be evaluated in detail.

Further, in the evaluation device 100 according to the present embodiment, the evaluation unit 224 obtains the evaluation data by weighting the third time data rather than the first time data and the second time data. If the viewpoint can be focused on the specific object M0 in the third display period, it is highly probable that the specific object M0 was closely watched even in the first display period and the second display period up to that point. Therefore, the evaluation data can be efficiently obtained by weighting the third time data and obtaining the evaluation value.

Further, in the evaluation device 100 according to the present embodiment, the area setting unit 216 sets the corresponding area A based on the locus of the specific object M0 in the second display period in which the second display operation is performed. As a result, the corresponding area A can be set accurately according to the movement of the specific object M0, so that highly accurate time data can be obtained.

Further, in the evaluation device 100 according to the present embodiment, after performing the third display operation, the display control unit 202 distinguishes the specific object M0 from the other object M and displays it on the display screen. The fourth display operation is performed. Thereby, after the third display operation, it is possible to inform the subject of the position where the specific object M0 exists. By knowing the position of the specific object M0, the subject can confirm whether or not his / her own follow-up has been performed correctly, so that the follow-up training can be easily performed.

Further, in the evaluation device 100 according to the present embodiment, the display control unit 202 displays an operation in which the specific object M0 shields the predetermined object C in the first display operation. As a result, the subject can intuitively recognize the specific object M0. Further, in the second display operation and the third display operation, since the plurality of objects M are displayed without displaying the shielded object, the plurality of objects M move in the second display operation and the third display operation. The display can be easily performed.

The technical scope of the present invention is not limited to the above-described embodiment, and modifications can be made as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, in the first display operation, as an example of distinguishing the specific object M0 from the other object M in a display mode different from that of the other object M and displaying it on the display screen 101S, the coin C is shielded by the specific object M0. The case of displaying is described, but the present invention is not limited to this. For example, the specific object M0 may be blinked, or the color of the specific object M0 may be changed with respect to another object M. Further, in the first display operation, for example, a coin is displayed as an object M, a coin that becomes a specific object M0 is marked on one of the front and back sides of the coin, and then the mark is placed on all the objects M. The surface opposite to the attached surface may be displayed.

Further, in the above embodiment, the case where the plurality of objects M move so as not to overlap each other in the second display operation has been described as an example, but the present invention is not limited to this. FIG. 22 is a diagram showing a modified example of the image displayed on the display device by the display control unit according to the present embodiment. FIG. 22 shows an example of the display screen 101S when the second display operation is performed.

As shown in FIG. 22, the display control unit 202 may move the objects M1 to M3 so as to overlap each other when performing the second display operation. In this case, the display control unit 202 may arrange the object M arranged below the display screen 101S on the front side and the object M arranged above the display screen 101S on the back side, for example. .. This makes it easier for the subject to grasp the spatial positional relationship of the objects M1 to M3.

Symptoms of cranial nerve diseases and disabilities are known to affect spatial cognitive ability in addition to tracking ability. When the subject is not a person with a cranial nerve disease or a disability, the specific object M0 can be tracked when a plurality of objects M1 to M3 are moved so as to overlap each other. On the other hand, when the subject is a person with a cranial nerve disease or a disability, when a plurality of objects M1 to M3 are moved so as to overlap each other, the spatial positional relationship between the objects M1 to M3 cannot be grasped and the specific target is specified. It may not be possible to track the object M0. Therefore, when a plurality of objects M1 to M3 are moved so as to overlap each other, it is possible to evaluate the spatial cognitive ability of the subject by detecting whether the subject can follow the specific object M0. is there.

Further, in the above embodiment, the area setting unit 216 sets the corresponding areas A3 to A5 based on the locus of the specific object M0 for each period T3 to T5 in the second display period in which the second display operation is performed. Has been described as an example, but the present invention is not limited to this. The area setting unit 216 may switch and set the corresponding area A in each of the periods T3 to T5. In this case, the area setting unit 216 can obtain the locus when the specific object M0 moves at predetermined time intervals within each period, and can set the corresponding area A in the range including the locus. Further, by setting the predetermined time short, it is possible to set the corresponding area A that moves following the movement of the specific object M0.

Further, in the above embodiment, when the evaluation value ANS is obtained, the evaluation unit 224 has described an example of adding a value obtained by multiplying the counter values CNTA, CNTB, and CNTC by a constant, but the present invention is not limited to this. For example, the evaluation unit 224 may obtain the evaluation value by individually determining each of the counter values CNTA, CNTB, and CNTC.

Further, in the above embodiment, the case where the evaluation device 100 is used as an evaluation device for evaluating the possibility of being a cranial nerve disease / disabled person has been described as an example, but the present invention is not limited to this. For example, the evaluation device 100 may be used as an evaluation device for evaluating the memory ability of a subject who is not a cranial nerve disease / disabled person.

A, A1 to A6 ... Corresponding area, C ... Coin, M0 ... Specific object, M, M1 to M3 ... Object, P ... Plot point, T1 to T7 ... Period, ANS ... Evaluation value, CNTA, CNTB, CNTC ... Counter value, 20 ... computer system, 20A ... arithmetic processing device, 20B ... storage device, 20C ... computer program, 30 ... input / output interface device, 40 ... drive circuit, 50 ... output device, 60 ... input device, 70 ... audio output Device, 100 ... line-of-sight detection device, evaluation device, 101 ... display device, 101S ... display screen, 102 ... stereo camera device, 102A ... first camera, 102B ... second camera, 103 ... lighting device, 103A ... first light source, 103B ... second light source, 103C ... light source, 103V ... virtual light source, 109 ... corneal curvature radius, 110, 110H ... corneal curvature center, 111 ... eyeball, 112 ... pupil, 112C ... pupil center, 113 ... corneal reflection image, 113C, 121, 122, 124 ... Corneal reflection center, 123, 131, 132, 173 ... Straight line, 126 ... Distance, 130 ... Target position, 177, 178 ... Line of sight, 202 ... Display control unit, 204 ... Light source control unit, 206 ... Image Data acquisition unit, 208 ... Input data acquisition unit, 210 ... Position detection unit, 212 ... Curvature center calculation unit, 214 ... Gaze point detection unit, 216 ... Area setting unit, 218 ... Judgment unit, 220 ... Calculation unit, 222 ... Storage Unit, 224 ... Evaluation unit, 226 ... Output control unit, 302 ... Input / output unit, 402 ... Display device drive unit, 404A ... First camera input / output unit, 404B ... Second camera input / output unit, 406 ... Light source drive unit

Claims (5)

An image data acquisition unit that acquires image data of the subject's eyeball,
A gaze point detection unit that detects the position data of the gaze point of the subject based on the image data,
For a plurality of objects having the same appearance, one object is designated as a specific object and displayed on a display screen in a display mode different from that of the other objects, and then the specific object is the same as the other object. A first display operation for displaying on the display screen in the display mode of the above, and a second display operation for displaying a state in which a plurality of the objects move after performing the first display operation on the display screen in the same display mode. A third display operation that displays a state in which the movement of the plurality of objects is stopped on the display screen in the same display mode after the second display operation is performed, and a display control unit that performs a display operation including the second display operation.
On the display screen, an area setting unit for setting a corresponding area corresponding to the position of the specific object, and an area setting unit.
Based on the position data of the gazing point, a determination unit that determines whether or not the gazing point exists in the corresponding area during the display period in which the display operation is performed, and a determination unit that outputs the determination data.
Based on the determination data, a calculation unit that calculates time data indicating the existence time of the gazing point in the corresponding region during the display period, and a calculation unit.
An evaluation unit that obtains the evaluation data of the subject based on the time data, and
An evaluation device including an output control unit that outputs the evaluation data. The calculation unit includes first time data indicating the existence time in the first display period in which the first display operation is performed, and second time indicating the existence time in the second display period in which the second display operation is performed. The data and the third time data indicating the existence time in the third display period in which the third display operation is performed are calculated.
The evaluation device according to claim 1, wherein the evaluation unit obtains the evaluation data based on the first time data, the second time data, and the third time data. The evaluation device according to claim 1 or 2, wherein the area setting unit sets the corresponding area based on the locus of the specific object in the second display period in which the second display operation is performed. Acquiring image data of the subject's eyeball and
To detect the position data of the gazing point of the subject based on the image data,
For a plurality of objects having the same appearance, one object is designated as a specific object and displayed on a display screen in a display mode different from that of the other objects, and then the specific object is the same as the other object. The first display operation to be displayed on the display screen in the display mode of the above, and the second display operation to display the state in which a plurality of the objects move after the first display operation is performed on the display screen in the same display mode. A third display operation for displaying a state in which the movement of the plurality of objects is stopped on the display screen in the same display mode after the second display operation is performed, and a display operation including the second display operation are performed.
On the display screen, setting a corresponding area corresponding to the position of the specific object and
Based on the position data of the gazing point, it is determined whether or not the gazing point exists in the corresponding area during the display period in which the display operation is performed, and the determination data is output.
Based on the determination data, time data indicating the existence time of the gazing point in the corresponding region during the display period is calculated.
Obtaining the evaluation data of the subject based on the time data,
An evaluation method including outputting the evaluation data. The process of acquiring image data of the subject's eyeball and
A process of detecting the position data of the gazing point of the subject based on the image data, and
For a plurality of objects having the same appearance, one object is designated as a specific object and displayed on a display screen in a display mode different from that of the other objects, and then the specific object is the same as the other object. A first display operation for displaying on the display screen in the display mode of the above, and a second display operation for displaying a state in which a plurality of the objects move after performing the first display operation on the display screen in the same display mode. A third display operation for displaying a state in which the movement of the plurality of objects is stopped on the display screen in the same display mode after the second display operation is performed, and a process for performing a display operation including the second display operation.
On the display screen, a process of setting a corresponding area corresponding to the position of the specific object and
Based on the position data of the gazing point, it is determined whether or not the gazing point exists in the corresponding area during the display period in which the display operation is performed, and the determination data is output.
Based on the determination data, a process of calculating time data indicating the existence time of the gazing point in the corresponding region during the display period, and
The process of obtaining the evaluation data of the subject based on the time data, and
An evaluation program that causes a computer to execute the process of outputting the evaluation data.

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