JP2021148907A - Evaluation device, evaluation system, evaluation server and evaluation program - Google Patents

Abstract

To evaluate ability for visually recognizing the surrounding of a vehicle.SOLUTION: An evaluation device is configured to detect a fixation point of an evaluation object person, in a simulation video displayed on a display. On the basis of the detected fixation point, for every fixation point being a standard, a gaze period of the evaluation object person is detected. Out of a plurality of visual field regions, a visual field region to which the evaluation object gazed, is determined for every fixation point being the standard. On the basis of correspondence between the fixation point being the standard, and the gaze period, and correspondence between the visual field region and the fixation point being the standard, all gaze periods according to the visual field region are acquired and integrated for every visual field region. On the basis of the gaze period for every integrated visual field region, a first evaluation value for evaluating deviation of the gaze period in the plurality of visual field regions, is calculated. On the basis of the gaze period, a second evaluation value for evaluating adequacy of each gaze period to the visual field region, is calculated. On the basis of the first and second evaluation values, a visual confirmation ability evaluation value for evaluating ability for visually recognizing the surrounding of the vehicle, is calculated.SELECTED DRAWING: Figure 6

Description

The present invention relates to an evaluation device, an evaluation system, an evaluation server and an evaluation program capable of evaluating the ability to visually recognize the surroundings of a vehicle.

Conventionally, various driving aptitude diagnosis methods have been used in order to suppress vehicle accidents. In Patent Document 1, evaluation criteria are set based on the driving behavior of an accident-free driver and the driving behavior of an accident-causing driver, and then diagnostic data of subject's driving behavior information is analyzed based on the evaluation criteria. A method for diagnosing driving aptitude for determining a subject's driving aptitude is disclosed. According to this driving aptitude diagnosis method, information on driving aptitude and the like can be fed back to the subject to improve the driving skill of the subject, so that a vehicle accident can be suppressed.

Japanese Unexamined Patent Publication No. 2008-139553

In order to suppress a vehicle accident, the ability to visually recognize the surroundings of the vehicle (hereinafter, also simply referred to as the visibility ability) is required as a base of driving skill. Even if the driving skill is excellent, if the visibility ability is insufficient, for example, when parking in the back, there is a possibility of causing an accident by coming into contact with another vehicle, a guardrail, or the like.

Here, since the method described in Patent Document 1 is a method focusing on the driving skill as described above, the driving skill of the subject can be measured, but the visual ability cannot be measured.

In view of this point, it is an object of the present invention to provide an evaluation device, an evaluation system, an evaluation server and an evaluation program capable of evaluating the ability to visually recognize the surroundings of a vehicle.

The first invention of the present application is an evaluation device for evaluating the ability to visually recognize the surroundings of a vehicle, and includes a display, a video reproduction unit, a gazing point detecting unit, a gazing time detecting unit, and a visual field area determining unit. , A time integration unit and an evaluation value calculation unit are provided.

The video reproduction unit displays a simulation video on which a plurality of field of view areas are set in advance on the display. The gaze point detection unit detects the gaze point of the evaluation target person in the simulation image displayed on the display. The gaze time detection unit detects the gaze time of the evaluation target person for each reference gaze point based on the gaze point detected by the gaze point detection unit. The visual field region determination unit determines the visual field region that the evaluation target person is gazing at for each reference gazing point among the plurality of visual field regions. The time integration unit has a correspondence relationship between the reference gaze point and the gaze time obtained by the gaze time detection unit and a correspondence relationship between the visual field area and the reference gaze point obtained by the visual field area determination unit. Based on, all gaze times according to the visual field area are acquired and integrated for each visual field area. The evaluation value calculation unit calculates a first evaluation value for evaluating the bias of the gaze time for each visual field in a plurality of visual fields based on the gaze time for each visual field calculated by the time integration unit, and detects the gaze time. Based on the gaze time detected by the unit, a second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated, and the surroundings of the vehicle are visually recognized based on the first evaluation value and the second evaluation value. Calculate the visual field ability evaluation value for evaluating the ability.

When the number of visual field areas is set to n, and the time when the i-region Ai is gazed out of the n visual field areas is Ti [s], the ratio of the time when the i-region Ai is gazed is γi [-]. It is represented by the following formula (i). Assuming that the one having the largest difference from the reference value 1 / n among γ1 to γn is γmax, the first evaluation value is calculated using the deviation Y represented by the following equation (ii).

When the field of view is set to three, the first evaluation value is calculated by the following formula (iii).

The second evaluation value is composed of a second evaluation point addition value P2a indicating the total of points added and a second evaluation deduction value P2b indicating the total of points deducted. When the gaze time generated at the i-th time from the start of the simulation is ti [s] and the score for ti [s] is pi, and the ti [s] is equal to or less than the first threshold value, it is regarded as "the gaze time is short". When pi = 0 and ti [s] is larger than the first threshold value A and equal to or less than the second threshold value B, pi = b is set as “appropriate gaze time” and ti [s] is greater than the second threshold value B. When it is largely equal to or less than the third threshold value C, it is set as "long gaze time" and pi = c, and when ti [s] is larger than the third threshold value C, it is set as "the gaze time is excessively long" and pi = d. (B> 0, c, d ≦ 0). The second evaluation point addition value P2a and the second evaluation deduction value P2b are calculated by the following equations (iV) and (V), respectively.

The second evaluation value is calculated by the sum of the second evaluation point addition value P2a and the second evaluation deduction value P2b. The visual ability evaluation value is calculated based on the sum of the first evaluation value and the second evaluation value.

The second invention of the present application is an evaluation system for evaluating the ability to visually recognize the surroundings of a vehicle, and includes an electronic device and a server connected to the electronic device via a network. The electronic device includes a display. The server includes a video reproduction unit that displays a simulation video in which a plurality of field of view areas are set in advance on a display. The electronic device further includes a gazing point detection unit that detects the gazing point of the evaluation target person in the simulation image displayed on the display.

The server further includes a gaze time detection unit, a visual field area determination unit, a time integration unit, and an evaluation value calculation unit. The gaze time detection unit detects the gaze time of the evaluation target person for each reference gaze point based on the gaze point detected by the gaze point detection unit. The visual field region determination unit determines the visual field region that the evaluation target person is gazing at for each reference gazing point among the plurality of visual field regions. The time integration unit has a correspondence relationship between the reference gaze point and the gaze time obtained by the gaze time detection unit and a correspondence relationship between the visual field area and the reference gaze point obtained by the visual field area determination unit. Based on, all gaze times according to the visual field area are acquired and integrated for each visual field area. The evaluation value calculation unit calculates a first evaluation value for evaluating the bias of the gaze time for each visual field in a plurality of visual fields based on the gaze time for each visual field calculated by the time integration unit, and detects the gaze time. Based on the gaze time detected by the unit, a second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated, and the surroundings of the vehicle are visually recognized based on the first evaluation value and the second evaluation value. Calculate the visual field ability evaluation value for evaluating the ability.

The third invention of the present application is an evaluation server provided in an evaluation system for evaluating the ability to visually recognize the surroundings of a vehicle, and the evaluation system further includes an electronic device connected to the evaluation server via a network. The electronic device includes a display. The evaluation server includes a video reproduction unit that displays a simulation video in which a plurality of field of view areas are set in advance on a display. The electronic device further includes a gazing point detection unit that detects the gazing point of the evaluation target person in the simulation image displayed on the display.

The evaluation server further includes a gaze time detection unit, a visual field area determination unit, a time integration unit, and an evaluation value calculation unit. The gaze time detection unit detects the gaze time of the evaluation target person for each reference gaze point based on the gaze point detected by the gaze point detection unit. The visual field region determination unit determines the visual field region that the evaluation target person is gazing at for each reference gazing point among the plurality of visual field regions. The time integration unit has a correspondence relationship between the reference gaze point and the gaze time obtained by the gaze time detection unit and a correspondence relationship between the visual field area and the reference gaze point obtained by the visual field area determination unit. Based on, all gaze times according to the visual field area are acquired and integrated for each visual field area. The evaluation value calculation unit calculates a first evaluation value for evaluating the bias of the gaze time for each visual field in a plurality of visual fields based on the gaze time for each visual field calculated by the time integration unit, and detects the gaze time. Based on the gaze time detected by the unit, a second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated, and the surroundings of the vehicle are visually recognized based on the first evaluation value and the second evaluation value. Calculate the visual field ability evaluation value for evaluating the ability.

The fourth invention of the present application is an evaluation program for causing a computer to execute the following means. In the image reproduction means, a simulation image in which a plurality of field of view areas are set in advance is displayed on a display provided in the electronic device. The gaze point detecting means detects the gaze point of the evaluation target person in the simulation image displayed on the display. The gaze time detecting means detects the gaze time of the evaluation target person for each reference gaze point based on the gaze point detected by the gaze point detection means. In the visual field region determining means, among a plurality of visual field regions, the visual field region that the evaluation target person is gazing at is determined for each reference gazing point. In the time integration means, the correspondence relationship between the reference gaze point and the gaze time obtained by the gaze time detecting means and the correspondence relationship between the visual field area and the reference gaze point obtained by the visual field area determination means. Based on, all gaze times according to the visual field area are acquired and integrated for each visual field area. The evaluation value calculation means calculates a first evaluation value for evaluating the bias of the gaze time for each visual field in a plurality of visual fields based on the gaze time for each visual field calculated by the time integration means, and detects the gaze time. Based on the gaze time detected by the means, a second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated, and the surroundings of the vehicle are visually recognized based on the first evaluation value and the second evaluation value. Calculate the visual field ability evaluation value for evaluating the ability.

According to the present invention, the ability to visually recognize the surroundings of the vehicle can be evaluated. Further, by feeding back the evaluation result to the evaluation target person, the visual ability of the evaluation target person can be improved, and eventually a vehicle accident can be suppressed.

It is a figure which shows the hardware configuration of the HMD (evaluation apparatus) which concerns on 1st Embodiment. It is a figure which shows the functional structure of the HMD (evaluation apparatus) which concerns on 1st Embodiment. It is a figure which shows three field-of-view areas set in the simulation image in 1st Embodiment. It is a figure which shows the modification of the three field of view regions set in the simulation image in 1st Embodiment. It is an enlarged schematic diagram of the simulation image visually recognized by the evaluation subject wearing the HMD. It is a flowchart which shows the flow of processing performed in HMD. It is a flowchart which shows the flow of the detection of the gaze time by the gaze time detection unit. It is a figure explaining the case where the image which is visually recognized in the direction different from the direction of the field of view is included in the field of view area. It is a figure which shows the evaluation system which has the evaluation apparatus which concerns on 2nd Embodiment. It is a figure which shows the evaluation system which has the evaluation apparatus which concerns on 3rd Embodiment.

(First Embodiment)
Hereinafter, an evaluation device (hereinafter, simply referred to as an evaluation device) for evaluating the ability to visually recognize the surroundings of the vehicle according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a hardware configuration of the HMD according to the first embodiment. In the first embodiment, a head-mounted display (hereinafter referred to as HMD) is used as the evaluation device, but the present invention is not limited to this, and various electronic devices such as mobile terminals (tablets and smartphones) can be used.

The HMD 1 includes a display 2, a gazing point detection unit 3, a memory 4, and a processor 5. The display 2 displays a simulation image for evaluating the visual ability. The HMD 1 is fixed to the head of the evaluation target by a wearing belt (not shown) so that the display 2 is placed in front of the eyes of the evaluation target (not shown).

The simulation video is a video for allowing the evaluation target person to experience virtual reality, and any video can be selected. For example, in the present embodiment, the image of parking the virtual vehicle T as shown in FIG. 3 is represented by VR (Virtual Reality). The view from the driver's seat H in the simulation image is from the broken line L1 extending rearward from the driver's seat H along the length direction of the vehicle T to the broken line L2 passing through the driver's seat H and the inner edge of the left side mirror T1. From the first region A1 of the above, the second region A2 from the broken line L2 to the broken line L3 passing through the driver's seat H and the inner edge of the right side mirror T2, and the third region A3 from the broken line L3 to the broken line L1. The configured field of view is preset. That is, the first region A1 indicates the left side region of the vehicle (the region visible from the left side glass of the vehicle and the region visible through the left side mirror T1), and the second region A2 is the front region (windshield) of the vehicle. The third area A3 indicates the right side area of the vehicle (the area visible from the right side glass of the vehicle and the area visible through the right side mirror T2). The "inner edge of the side mirror" refers to a portion of the side mirror located on the innermost side (center side of the vehicle) when viewed from the driver's seat H in the simulation image.

In the present embodiment, the first region A1, the second region A2, and the third region A3 shown in FIG. 3 are set as the visual field region, but the present invention is not limited to this, and for example, as shown in FIG. The first region A1 is the region from the broken line L4 extending diagonally rearward to the left from the driver's seat H to the broken line L2, and the third region A3 is the region from the broken line L3 to the dashed line L5 extending diagonally rearward to the right from the driver's seat H. It may be set. Further, in the present embodiment, the field of view is set to three, but the present invention is not limited to this, and the field of view may be set to two or four or more. Since it is only necessary to set the field of view in this way, any image can be used as a simulation image. In other words, the evaluation described in this embodiment can be applied to any video.

The gazing point detection unit 3 detects the gazing point of the evaluation target person in the simulation image displayed on the display 2. The "gaze point" is "the line-of-sight position coordinates with respect to the simulation image when the evaluation target person is visually recognizing the simulation image".

FIG. 5 is an enlarged schematic view of a simulation image visually recognized by an evaluation target person wearing an HMD. The first region A1, the second region A2, and the third region A3 shown in FIG. 5 correspond to the first region A1, the second region A2, and the third region A3 shown in FIG. Further, the background image (road, other vehicle, etc.) expressed in the simulation image will not be described in FIG. The gaze point detection unit 3 detects the gaze point of the evaluation target person every sampling cycle Δt [s]. In FIG. 5, the gazing point is detected in the order of a1 → a2 → a3 → b1 → c1 → c2 → c3 → c4 → ... From the first gazing point a1.

As a method of detecting the gazing point in the gazing point detecting unit 3, a method of detecting based on the movement of the eyeball, the elliptical shape of the pupil, or the like by infrared rays can be adopted, but the method is not limited to this. Utilizing the fact that the driver's field of view changes according to the direction of the driver's face in the actual vehicle, based on the left and right turning angles of the head with respect to the front direction of the virtual vehicle (vehicle displayed in the simulation image). A method of detecting the gazing point may be adopted.

The memory 4 is a storage device that stores various data and programs. The processor 5 is a processing device that reads out and executes data and programs stored in the memory 4.

(Functional configuration)
FIG. 2 is a diagram showing a functional configuration of the HMD according to the first embodiment. With reference to FIG. 2, the HMD 1 has a storage unit 6 and a control unit 7. The storage unit 6 corresponds to the memory 4 in the hardware configuration. The control unit 7 corresponds to the processor 5 in the hardware configuration.

The storage unit 6 has a simulation image DB 61 in which a simulation image to be displayed on the display 2 is stored. The control unit 7 includes a video reproduction unit 71, a gaze time detection unit 72, a visual field area determination unit 73, a time integration unit 74, and an evaluation value calculation unit 75.

The video reproduction unit 71 reads the simulation video from the simulation video DB 61 and displays it on the display 2.

The gaze time detection unit 72 detects each gaze time of the evaluation target person based on the gaze point detected by the gaze point detection unit 3. Here, the "gaze time" means "a predetermined area is set so as to include the reference gaze point with respect to the reference gaze point (hereinafter, also referred to as a reference gaze point), and the gaze point is within the predetermined area. It is the time that is continuously included. " In the present embodiment, the “reference gazing point” refers to, but is not limited to, a gazing point first detected by the gazing point detection unit 3 and a gazing point moved from within the predetermined area to outside the predetermined area. ..

Normally, even if a human tries to continuously gaze at only one point, a certain degree of error (blurring) occurs in the line-of-sight position. Therefore, by setting a predetermined area for the reference gaze point so as to include the reference gaze point and setting the time during which the gaze point is continuously included in the predetermined area as the "gaze time", more accurate gaze is performed. The time can be detected.

Here, the method of detecting the gaze time will be described again with reference to FIG. The flow for detecting the gaze time will be described in detail later. As described above, the gazing point detection unit 3 detects the gazing point in the order of a1 → a2 → a3 → b1 → c1 → c2 → c3 → c4 → ... For each sampling cycle Δt [s]. Here, since the gazing point a1 is the gazing point first detected by the gazing point detecting unit 3, it corresponds to the reference gazing point. Therefore, the gaze time detection unit 72 sets the predetermined region Q1 so as to include the gaze point a1 with respect to the gaze point a1. In the present embodiment, the predetermined region Q1 is a region inside the circle centered on the gazing point a1. Since the gazing points a2 and a3 detected following the gazing point a1 are included in the predetermined region Q1, it is an "error (blurring of the line of sight) in the state of gazing at the gazing point a1". Since the gaze point b1 next to the gaze point a3 is not included in the predetermined area Q1, the gaze points a1 to a3 continuously included in the predetermined area Q1 are "a state in which the evaluation target person is gazing at a1". The gaze time is calculated. Specifically, since the sampling cycles of the gazing points a1 to a3 are Δt [s], the gazing time in the “state in which the evaluation target person is gazing at a1” is “a1 → a2” and “a2”. → It is expressed as the sum of "a3", that is, 2 × Δt [s].

Since the gazing point b1 is a gazing point moved from the inside of the predetermined area Q1 to the outside of the predetermined area Q1, it corresponds to the reference gazing point. Therefore, the predetermined region Q2 is set so as to include the gazing point b1 with respect to the gazing point b1. In the present embodiment, the predetermined region Q2 is a region inside the circle centered on the gazing point b1. Since the gaze point c1 next to the gaze point b1 is not included in the predetermined region Q2, only the gaze point b1 is "a state in which the evaluation target person is gazing at b1", and the gaze time is calculated. Specifically, the gaze time in the "state in which the evaluation target person is gaze at b1" is expressed as 0 [s].

Since the gazing point c1 is a gazing point moved from the predetermined area Q2 to the outside of the predetermined area Q2, it corresponds to the reference gazing point. Therefore, the predetermined region Q3 is set so as to include the gazing point c1 with respect to the gazing point c1. In the present embodiment, the predetermined region Q3 is a region inside the circle centered on the gazing point c1. Since the gazing points c2 to c4 are included in the predetermined region Q3, it is an "error (blurring of the line of sight) in the state of gazing at the gazing point c1". Since the next gazing point of the gazing point c4 is not included in the predetermined region Q3, the gazing points c1 to c4 are "a state in which the evaluation target person is gazing at c1", and the gazing time is calculated. Specifically, since the sampling cycles of the gazing points c1 to c4 are Δt [s], respectively, the gazing time in the “state in which the evaluation target person is gazing at c1” is “c1 → c2” and “c2”. → c3 ”and“ c3 → c4 ”are combined, that is, expressed as 3 × Δt [s].

The position, shape, range, etc. of the predetermined region can be appropriately set according to the method of detecting the gazing point. For example, in the method of detecting the gazing point based on the left and right turning angles of the head with respect to the front direction of the virtual vehicle, a region having a predetermined width on the left and right with respect to the front direction of the evaluation target person is set as a predetermined region. can do. The "gaze point" in this method is expressed by coordinates only in the left-right direction based on the left-right turning angle of the head with respect to the front direction of the virtual vehicle.

The visual field region determination unit 73 determines which of the three visual field regions (A1 to A3) the evaluation target person is gazing at for each reference gazing point. With reference to FIG. 5, in the "state in which the evaluation target person is gazing at the gazing point a1 (a1 to a3)", since the gazing point a1 is included in the second region A2, "the second region A2 is gazing at". Was. " In the "state in which the evaluation target person is gazing at the gazing point b1 (b1)", since the gazing point b1 is included in the second region A2, it is determined that "the evaluation target person is gazing at the second region A2". In the "state in which the evaluation target person is gazing at the gazing point c1 (c1 to c4)", since the gazing point c1 is included in the first region A1, it is determined that "the evaluation target person was gazing at the first region A1".

Here, the gazing point c4 is included in the second region A2 instead of the first region A1. However, the gazing point c4 is included in the predetermined region Q3 set for the gazing point c1, and is "a state in which the evaluation target person is gazing at c1". In consideration of this point, the determination in the visual field determination unit 73 is not "each gazing point (a1 to c4 in the present embodiment)", but as illustrated above, "reference gazing point (a1, b1 in the present embodiment)". , C1) ”.

The time integration unit 74 includes (1) the correspondence between the reference gaze points a1, b1, c1 and the gaze time obtained by the gaze time detection unit 72, and (2) the visual field obtained by the visual field area determination unit 73. Based on the correspondence between the regions A1 to A3 and the reference gazing points a1, b1 and c1, all the gazing times corresponding to the visual field regions A1 to A3 are acquired and integrated for each of the visual field regions A1 to A3.

With reference to FIG. 5, as described above, the first region A1 includes the reference gazing point c1. Here, the gaze time at the reference gaze point c1 (that is, the gaze time in the “state in which the evaluation target person is gaze at c1”) is 3 × Δt [s] as described above. Therefore, the gaze time in the first region A1 is calculated as 3 × Δt [s].

As described above, the second region A2 includes the reference gazing points a1 and b1. Here, the gaze time at the reference gaze point a1 (that is, the gaze time in the “state in which the evaluation target person is gaze at a1”) is 2 × Δt [s] as described above. Further, the gaze time at the reference gaze point b1 (that is, the gaze time in the "state in which the evaluation target person is gaze at b1") is 0 [s] as described above. Therefore, the gaze time in the second region A2 is calculated as 2 × Δt [s] + 0 = 2 × Δt [s].

Since the reference gaze point is not included in the third region A3, the gaze time in the third region A3 is calculated as 0 [s].

The evaluation value calculation unit 75 is based on the gaze time detected by the gaze time detection unit 72 and the gaze time for each visual field area calculated by the time integration unit 74, and the visual ability evaluation value (the evaluation target person is the vehicle). (Evaluation value for evaluating whether or not the surroundings of the can be visually recognized) is calculated.

The method of calculating the evaluation value in the evaluation value calculation unit will be described in more detail. The evaluation value calculation unit calculates the following first evaluation value P1 and second evaluation value P2, and then obtains the visual ability evaluation value P.

(Calculation method of the first evaluation value P1)
The first evaluation value P1 is an index for evaluating the bias of the gaze time in each of the visual field regions A1 to A3 (whether the evaluation target person confirms the surroundings of the vehicle in a well-balanced manner), and is calculated by the time integration unit 74. It is also calculated based on the gaze time for each field of view. Specifically, the time when the evaluation subject gazes at the first region A1 is T1 [s], the time when the evaluation subject gazes at the second region A2 is T2 [s], and the time when the evaluation subject gazes at the third region A3 is T3 [s]. ], The ratio of the time when the first region A1 was gazed γ1 [-], the ratio of the time when the second region A2 was gazed γ2 [-], and the ratio of the time when the third region A3 was gazed γ3 [-]. , Can be expressed by the following equations (1) to (3), respectively.

Here, if γmax is defined as γ1 [−], γ2 [−], and γ3 [−] having the largest difference from the reference value M = 1/3, the first evaluation value P1 is expressed by the following equation ( Calculated in 4). Since it is necessary to check the surroundings of the vehicle with an even balance (γ1 = γ2 = γ3), the reference value M = 1/3 is set. The numerical value of "300" in the following formula (4) can be appropriately changed according to the ease of evaluation, the accuracy of evaluation, and the like, and can be changed to, for example, 250 or 400.

By setting the reference value M = 1/3, the first evaluation value P1 becomes 0 or less. That is, the first evaluation value P1 in the present embodiment is premised on "confirming the surroundings of the vehicle with an even balance", and points will be deducted if the surroundings of the vehicle are not confirmed with an even balance.

Here, consider the case where the field of view is set to n. Assuming that the time when the i-region Ai is gazed is Ti [s], the ratio γi [-] of the time when the i-region Ai is gazed can be expressed by the following equation (5) (i is 1 to n). Integer up to).

Here, if γmax is defined as the one having the largest difference from the reference value M among γ1 to γn, the first evaluation value P1 uses the deviation Y represented by the following equation (6) and is expressed in the equation (7). ) Is calculated. When the field of view is set to n, the reference value M = 1 / n is set on the premise that "the surroundings of the vehicle are confirmed with an even balance". The value of V in the following equation (7) can be appropriately set according to the ease of evaluation, the accuracy of evaluation, and the like, and can be set to, for example, n × 100.

Further, when the field of view is set to three, the reference value M> 1/3 can be set, and for example, the reference value M = 1/2 can be set. In this case, when 1/3 <γmax <1/2 (the bias of the confirmation of the surroundings of the vehicle is small), P1 becomes a positive value (additional points), and γmax> 1/2 (the bias of the balance of the confirmation of the surroundings of the vehicle is small). The first evaluation value P1 can be calculated by the following formula so that P1 becomes a negative value (point deduction) when (is large). The numerical value of "300" in the following formula (8) can be appropriately changed according to the ease of evaluation, the accuracy of evaluation, and the like, and can be changed to, for example, 250 or 400.

(Calculation method of the second evaluation value P2)
The second evaluation value P2 is an index for evaluating the validity of each gaze time with respect to the visual field area (whether the evaluation target person carefully confirms the surroundings of the vehicle), and is an evaluation detected by the gaze time detection unit 72. It is calculated based on the gaze time of the subject. The second evaluation value P2 is composed of a second evaluation point addition value P2a indicating the total of points added and a second evaluation deduction value P2b indicating the total of points deducted. Specifically, when the gaze time generated i-th time from the start of the simulation is ti [s] and the score for ti [s] is pi, and the ti [s] is equal to or less than the first threshold value A, "gaze". When "time is short", pi = 0, and when ti [s] is larger than the first threshold value A and equal to or less than the second threshold value B, pi = b is set as "appropriate gaze time", and ti [s] is When it is larger than the second threshold value B and equal to or less than the third threshold value C, pi = c is set as "the gaze time is long", and when ti [s] is larger than the third threshold value C, "the gaze time is excessively long". Let pi = d (b> 0, c, d ≦ 0). When d ≦ c ≦ 0, c = (dti-Bd) / (CB) can be set. For example, when A = 0.2, B = 0.5, C = 3.0, b = 5, d = -50, c = -20ti + 10 is set. Further, for example, when d <c <0 is set, (b, c, d) = (10, -10, -20) may be set, or (15, -20, -30) may be set. The values of the first threshold value A, the second threshold value B, and the third threshold value C, b, c, and d used for the evaluation of the second evaluation point addition value P2a and the second evaluation deduction value P2b are the ease of evaluation and the accuracy of evaluation. It can be set as appropriate according to the sex and the like.

Based on the above-mentioned score pi, the second evaluation point addition value P2a indicating the total of points added and the second evaluation deduction value P2b indicating the total of points deducted are obtained by the following equations (9) and (10), respectively. If the gaze time is appropriate, the second evaluation value P2 is added, and if the gaze time is not appropriate (short or long), the second evaluation value P2 is deducted.

(Calculation method of visual ability evaluation value P)
The visual ability evaluation value P is calculated by the following equation (11) using the first evaluation value P1 and the second evaluation value P2 (second evaluation point addition value P2a, second evaluation deduction value P2b). The numerical value of "1000" in the formula (11) can be appropriately changed according to the ease of evaluation, the accuracy of evaluation, and the like, and can be changed to, for example, 1500 or 900.

As shown in the formula (11), the visual ability evaluation value P is the first evaluation value P1 set from the viewpoint of "whether the evaluation target person confirms the surroundings of the vehicle in a well-balanced manner" and "the evaluation target person is the vehicle". It is calculated based on the second evaluation value P2 set from the viewpoint of "Are you checking the surroundings carefully?" Therefore, according to the evaluation device 1 according to the present invention, the ability to visually recognize the surroundings of the vehicle can be evaluated.

The control unit 7 may display the visual ability evaluation value P calculated by the equation (10) on the display 2. As a result, the evaluation target person can know his / her own evaluation result and improve the visual ability. In addition, by displaying the first evaluation value P1, the second evaluation point addition value P2a, and the second evaluation deduction value P2b, the viewpoint of "Is the vehicle surroundings confirmed in a well-balanced manner?" Since it is possible to reconfirm one's own visual ability from the viewpoint of "Is it confirmed?", It is possible to improve the visual ability. Further, by displaying the above-mentioned values of γa [-], γb [-], and γc [-] on the display, the evaluation target person can understand the imbalance in the balance of visually recognizing the surroundings of the vehicle. It is possible to improve the ability.

(Processing flow)
The flow of processing performed in HMD1 will be described. FIG. 6 is a flowchart showing the flow of processing performed in the HMD. With reference to the figure, the image reproduction unit 71 reads out the simulation image from the simulation image DB 61 and displays it on the display 2 in a state where the evaluation target person wears the HMD1 (S110). As described in the above-described embodiment, the first field of view area A1, the second field of view area A2, and the third field of view area A3 are preset in the field of view from the driver's seat H in the simulation image (see FIG. 3).

The gaze time detection unit 72 detects each gaze time of the evaluation target person for each reference gaze point (S120). Here, the method of detecting the gaze time will be described in more detail with reference to FIG. 7. FIG. 7 is a flowchart showing the flow of detecting the gaze time. With reference to FIG. 7, the gazing point detection unit 3 detects the reference gazing point of the evaluation target person in the simulation image displayed on the display 2 (S131). The gaze time detection unit 72 sets a predetermined region for the reference gaze point so as to include the reference gaze point (S132). The gazing point detection unit 3 detects the gazing point when the sampling period Δt has elapsed from the reference gazing point (S133). The gaze time detection unit 72 determines whether or not this gaze point is included in the predetermined region (S134).

When the gazing point after the sampling cycle Δt is included in the predetermined region (YES in S134), Δt is added to the gazing time (S135), and it is determined whether the simulation image is completed (S136). When it is determined that the simulation image is not completed (NO in S136), the gazing point detection unit 3 further detects the gazing point after the sampling cycle Δt (S133). On the other hand, when it is determined that the simulation image is finished (YES in S136), the detection of the gaze time is finished.

When the gaze point after the sampling cycle Δt is not included in the predetermined area (NO in S134), the gaze time added so far is saved and reset (S137), and it is determined whether the simulation image is completed (S138). .. If the gaze time is not added, the gaze time is saved as 0. When it is determined that the simulation image has not ended (NO in S136), the gazing point detection unit 3 detects the reference gazing point (S131). On the other hand, when it is determined that the simulation image is finished (YES in S138), the detection of the gaze time is finished.

With reference to FIG. 6 again, when the detection of the gaze time is completed, the visual field region determination unit 73 determines which of the three visual field regions A1 to A3 the evaluation target person is gazing at for each reference gaze point. (S130). Since the determination method in the visual field area determination unit 73 has been described above, the description thereof will be omitted.

The time integration unit 74 includes (1) the correspondence between the reference gaze points a1, b1, c1 and the gaze time obtained by the gaze time detection unit 72, and (2) the visual field obtained by the visual field area determination unit 73. Based on the correspondence between the regions A1 to A3 and the reference gazing points a1, b1, and c1, all the gazing times corresponding to the visual field regions A1 to A3 are acquired and integrated for each visual field regions A1 to A3 (S140). ). Since the calculation method in the time integration unit 74 has been described above, the description thereof will be omitted.

The first evaluation value P1 and the second evaluation value P2 are calculated based on the gaze time detected by the gaze time detection unit 72 and the gaze time for each of the visual field areas A1 to A3 detected by the time integration unit 74. (S150), the visual field evaluation value P is calculated (S160). Since the methods for calculating the first evaluation value P1, the second evaluation value P2, and the visual ability evaluation value P have been described above, the description thereof will be omitted.

The determination (S136, S138) as to whether or not the simulation image has ended may be arranged anywhere between S120 and S150. That is, S136 and S138 may be arranged between S130 and S140, or may be arranged between S140 and S150.

In the present embodiment, an image that is visually recognized (directly visually recognized) in the direction of this field of view is displayed in each field of view area set in the simulation image, but the direction of this field of view differs depending on the field of view. Images that are visible (indirectly visible) in the direction may be included. For example, as shown in FIG. 8, in the second region A2, there may be a rearview mirror RM provided in the vehicle or a rear-view monitor BM attached to the instrument panel of the vehicle. In the second area A2 (excluding the rear-view mirror RM and the rear-view mirror BM), an image when the front of the vehicle is visually recognized (directly visually recognized) is displayed, and the rear-view mirror RM is displayed via the rear-view mirror RM. The image when the rear view of the vehicle is visually recognized (indirectly visually recognized) is displayed, and the image when the rear view of the vehicle is visually recognized (indirectly visually recognized) through the camera mounted on the vehicle is displayed on the rearview monitor BM. Is displayed. Not limited to the rearview mirror RM and the rearview monitor BM, depending on the type of vehicle (for example, a bus, a truck, a vehicle according to the work purpose), an image visually recognized in the direction of this field of view in the field of view and the image thereof It may include both images that are viewed in a direction different from the direction of view.

When the gazing point exists in the area corresponding to the rearview mirror RM and the rearview monitor BM, and when the gazing point exists in the second area A2 (excluding the rearview mirror RM and the rearview monitor BM), the visually recognized image is displayed. Different from each other. In consideration of this point, the above-mentioned first evaluation value P1 can be calculated. In the second area A2, the area corresponding to the rearview mirror RM and the rearview monitor BM includes an axis that defines two axes that define the simulation image (specifically, an axis that defines the vertical direction (vertical direction in FIG. 8)). It can be specified based on the coordinate position with the horizontal direction (the axis defining the left-right direction in FIG. 8) as the coordinate axis.

When calculating the first evaluation value P1, if the gazing point exists in the area corresponding to the rear-view mirror RM and the rear-view monitor BM shown in FIG. 8, the time for gazing at the rear-view mirror RM and the rear-view monitor BM is calculated. The second region A2 can be excluded from the gaze time T2. Further, since the image displayed on the rear-view mirror RM and the rear-view monitor BM is an image included in the first area A1 or the third area A3, the time when the rear-view mirror RM and the rear-view monitor BM are watched is the time when the rear-view mirror RM and the rear-view mirror BM are watched. It can be calculated as the time (time T1 or time T3) of gazing at the view area (first area A1 or third area A3) including the image displayed on the rear-view monitor BM. That is, in the second region A2, the region corresponding to the rearview mirror RM and the rearview monitor BM can be regarded as the first region A1 or the third region A3.

As described above, the first evaluation value P1 is an index for evaluating the bias of the gaze time for each visual field area (whether the evaluation target person confirms the surroundings of the vehicle in a well-balanced manner). The accuracy of the first evaluation value P1 can be improved by calculating the first evaluation value P1 in consideration of the fact that an image visually viewed in a direction different from the above is included.

In FIG. 3, the first region A1 includes an image displayed on the left side mirror T1, but since this image is an image included in the first area A1, the first evaluation value P1 is calculated. It is not necessary to distinguish between the time when the left side mirror T1 is gazed and the time when the area other than the left side mirror T1 in the first region A1 is gazed. On the other hand, depending on the setting of the visual area, the image visually recognized (indirectly visually recognized) through the left side mirror T1 and the image visually recognized (directly visually recognized) without passing through the left side mirror T1 are different from each other. In some cases. In this case, the gaze time for each visual field area used for calculating the first evaluation value P1 is other than the time for gaze at the area corresponding to the left side mirror T1 (visual area) and the area corresponding to the left side mirror T1. It is possible to calculate separately from the time when the area (one or more visual areas) is gazed. The region corresponding to the left side mirror T1 can be specified based on the coordinate position with the two axes defining the above-mentioned simulation image as the coordinate axes.

Similarly, in FIG. 3, the third region A3 includes an image displayed on the right side mirror T2, but since this image is an image included in the third area A3, the first evaluation value P1 is set. In the calculation, it is not necessary to distinguish between the time when the right side mirror T2 is gazed and the time when the third region A3 other than the right side mirror T2 is gazed. On the other hand, depending on the setting of the visual area, the image visually recognized (indirectly visually recognized) through the right side mirror T2 and the image visually recognized (directly visually recognized) without passing through the right side mirror T2 are different from each other. In some cases. In this case, the gaze time for each visual field area used for calculating the first evaluation value P1 is other than the time for gaze at the area corresponding to the right side mirror T2 (visual area) and the area corresponding to the right side mirror T2. It is possible to calculate separately from the time when the area (one or more visual areas) is gazed. The region corresponding to the right side mirror T2 can be specified based on the coordinate position with the two axes defining the above-mentioned simulation image as the coordinate axes.

(Second Embodiment)
FIG. 9 is a diagram showing an evaluation system (hereinafter, simply referred to as an evaluation system) having an evaluation device according to the second embodiment. Of the components of the second embodiment, those having the same functions as the components of the first embodiment are designated by the same symbols and the description thereof will be omitted. The evaluation system 100 includes an HMD 1a, a server 10, and a display device 20. Not limited to the HMD, various electronic devices such as mobile terminals (tablets and smartphones) can be used, for example. The HMD1a, the server 10, and the display device 20 are connected via the network A. The network A is an open network such as the Internet, regardless of whether it is wired or wireless. The HMD1a includes a display 2, a gazing point detection unit 3, and a transmission / reception unit 8. The server 10 includes a storage unit 6 and a control unit 7. Since each configuration of the storage unit 6 and the control unit 7 is the same as that of the storage unit 6 and the control unit 7 in the first embodiment, the description thereof will be omitted.

The transmission / reception unit 8 included in the HMD 1a receives the simulation video read from the simulation video DB 61 by the video reproduction unit 71 of the server 10 from the server 10 via the network A. Further, the transmission / reception unit 8 transmits the gaze point in the simulation image detected by the gaze point detection unit 3 to the control unit 7 of the server 10 via the network A.

The display device 20 is arranged in, for example, a classroom accommodating a plurality of viewers. For example, the visual image of the evaluation target person can be stored in the storage unit 6 of the server 10 from the transmission / reception unit of the HMD1a via the network A, and the visual image can be displayed on the display device 20 via the network A. As a result, a person other than the evaluation target person can relive the experience by seeing the display image displayed on the display device 20. The visual image of the evaluation target person may be displayed on the display device 20 in real time without being stored in the storage unit 6 of the server 10.

The server 10 includes a storage unit 6 including a simulation video DB 61, a video reproduction unit 71, a gaze time detection unit 72, a field of view area determination unit 73, a time integration unit 74, and a control unit 7 including an evaluation value calculation unit 75. To be equipped. Therefore, even when the server 10 is connected to another electronic device including the display 2 and the gazing point detection unit 3 via the network A, the visual ability evaluation value P is calculated as in the first embodiment. , The ability to visually recognize the surroundings of the vehicle can be evaluated.

(Third Embodiment)
FIG. 10 is a diagram showing an evaluation system including the evaluation device according to the third embodiment. Of the components of the third embodiment, those having the same functions as the components of the second embodiment are designated by the same symbols and the description thereof will be omitted. The evaluation system 200 includes an HMD 1a, a management terminal 30, and a display device 20. Not limited to the HMD, various electronic devices such as mobile terminals (tablets and smartphones) can be used, for example. The HMD1a and the management terminal 30 are connected via the network B. The network B is a closed network and may be wired or wireless. The HMD1a includes a display 2, a gazing point detection unit 3, and a transmission / reception unit 8. The management terminal 30 includes a storage unit 6 and a control unit 7.

The management terminal 30 and the display device 20 are connected by a closed network. The closed network connecting the management terminal 30 and the display device 20 may be wired or wireless. The display device 20 is arranged in, for example, a classroom accommodating a plurality of viewers. For example, the visual image of the evaluation target person can be stored in the storage unit 6 of the management terminal 30 from the transmission / reception unit of the HMD1a via the network B, and the visual image can be displayed on the display device 20. As a result, a person other than the evaluation target person can relive the experience by seeing the display image displayed on the display device 20. The visual image of the evaluation target person may not be stored in the storage unit 6 of the management terminal 30, but may be displayed on the display device 20 in real time.

The management terminal 30 includes a storage unit 6 including a simulation video DB 61, a video reproduction unit 71, a gaze time detection unit 72, a field of view area determination unit 73, a time integration unit 74, and a control unit 7 including an evaluation value calculation unit 75. , Equipped with. Therefore, even when the management terminal 30 is connected to another electronic device including the display 2 and the gazing point detection unit 3 via the network B, the visual ability evaluation value P is calculated as in the first embodiment. However, the ability to visually recognize the surroundings of the vehicle can be evaluated.

Each function constituting the evaluation device 1 or the evaluation systems 100 and 200 described above can be realized by a program, and a computer program prepared in advance for realizing each function is stored in the auxiliary storage device to control the CPU and the like. The function of each unit can be operated by the unit reading the program stored in the auxiliary storage device into the main storage device and the control unit executing the program read into the main storage device.

Further, the program can be provided to a computer (for example, a server 10) in a state of being recorded on a computer-readable recording medium. Computer-readable recording media include optical discs such as CD-ROMs, phase-changing optical discs such as DVD-ROMs, magneto-optical discs such as MO (Magnet Optical) and MD (Mini Disk), floppy (registered trademark) discs, and the like. Examples include magnetic disks such as removable hard disks, compact flash (registered trademark), smart media, SD memory cards, and memory cards such as memory sticks. Further, a hardware device such as an integrated circuit (IC chip or the like) specially designed and configured for the purpose of the present invention is also included as a recording medium.

1: Evaluation device 2: Display 3: Gaze point detection unit 10: Server 30: Management terminal 71: Video reproduction unit 72: Gaze time detection unit 73: Visual field area determination unit 74: Time integration unit 75: Evaluation value calculation unit 100, 200: Evaluation system A1: A2, A3: Visibility area a1, b1, c1: Reference gazing point

Claims (9)

An evaluation device for evaluating the ability to visually recognize the surroundings of a vehicle.
With the display
A video playback unit that displays a simulation video with a plurality of field of view areas set in advance on the display, and
A gaze point detection unit that detects the gaze point of the evaluation target person in the simulation image displayed on the display, and a gaze point detection unit.
Based on the gaze point detected by the gaze point detection unit, the gaze time detection unit that detects the gaze time of the evaluation target person for each reference gaze point,
Of the plurality of visual field regions, a visual field region determination unit that determines the visual field region that the evaluation target person was gazing at for each reference gazing point, and a visual field region determination unit.
Correspondence between the reference gaze point and the gaze time obtained by the gaze time detection unit and the correspondence relationship between the view area and the reference gaze point obtained by the visual field area determination unit. Based on the above, a time integration unit that acquires all the gaze times corresponding to the visual field areas and integrates them for each visual field area, and
Based on the gaze time for each of the visual field regions calculated by the time integration unit, a first evaluation value for evaluating the deviation of the gaze time for each of the visual field regions in the plurality of visual field regions is calculated, and the gaze time detection unit Based on the gaze time detected by, a second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated, and based on the first evaluation value and the second evaluation value, the surroundings of the vehicle are moved. The evaluation value calculation unit that calculates the visual field ability evaluation value for evaluating the visual field ability,
An evaluation device characterized by being provided with. The field of view is set to n,
Assuming that the time when the i-region Ai is gazed out of the n visual fields is Ti [s], the ratio γi [-] of the time when the i-region Ai is gazed is expressed by the following formula (i). ,
Assuming that among γ1 to γn, the one having the largest difference from the reference value 1 / n is γmax, the first evaluation value is calculated using the deviation Y represented by the following equation (ii). The evaluation device according to claim 1.

The evaluation device according to claim 2, wherein the field of view is set to three, and the first evaluation value is calculated by the following formula (iii).

The second evaluation value is composed of a second evaluation point addition value P2a indicating the total of points added and a second evaluation deduction value P2b indicating the total of points deducted.
When the gaze time generated at the i-th time from the start of the simulation is ti [s] and the score for ti [s] is pi, and the ti [s] is equal to or less than the first threshold value, it is regarded as "the gaze time is short". When pi = 0 and ti [s] is larger than the first threshold value A and equal to or less than the second threshold value B, pi = b is set as “appropriate gaze time” and ti [s] is greater than the second threshold value B. When it is largely equal to or less than the third threshold value C, it is set as "long gaze time" and pi = c, and when ti [s] is larger than the third threshold value C, it is set as "the gaze time is excessively long" and pi = d. (B> 0, c, d ≦ 0),
The second evaluation point addition value P2a and the second evaluation deduction value P2b are calculated by the following equations (iV) and (V), respectively, according to any one of claims 1 to 3. The evaluation device described.

The evaluation device according to claim 4, wherein the second evaluation value is calculated by the sum of the second evaluation point addition value P2a and the second evaluation deduction value P2b. The evaluation device according to any one of claims 1 to 5, wherein the visual ability evaluation value is calculated based on the sum of the first evaluation value and the second evaluation value. An evaluation system for evaluating the ability to visually recognize the surroundings of a vehicle.
An electronic device and a server connected to the electronic device via a network are provided.
The electronic device is
Equipped with a display
The server
A video reproduction unit for displaying a simulation video in which a plurality of field of view areas are set in advance on the display is provided.
The electronic device further
A gaze point detection unit for detecting the gaze point of the evaluation target person in the simulation image displayed on the display is provided.
The server also
Based on the gaze point detected by the gaze point detection unit, the gaze time detection unit that detects the gaze time of the evaluation target person for each reference gaze point,
Of the plurality of visual field regions, a visual field region determination unit that determines the visual field region that the evaluation target person was gazing at for each reference gazing point, and a visual field region determination unit.
Correspondence between the reference gaze point and the gaze time obtained by the gaze time detection unit and the correspondence relationship between the view area and the reference gaze point obtained by the visual field area determination unit. Based on the above, a time integration unit that acquires all the gaze times corresponding to the visual field areas and integrates them for each visual field area, and
Based on the gaze time for each of the visual field areas calculated by the time integration unit, a first evaluation value for evaluating the deviation of the gaze time for each of the visual field areas in the plurality of visual field areas is calculated, and the gaze time detection unit. A second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated based on the gaze time detected by, and the surroundings of the vehicle are calculated based on the first evaluation value and the second evaluation value. An evaluation system including an evaluation value calculation unit that calculates a visual field evaluation value for evaluating the visual field ability. It is an evaluation server provided in the evaluation system for evaluating the ability to visually recognize the surroundings of the vehicle.
The evaluation system further comprises an electronic device connected to the evaluation server via a network.
The electronic device is
Equipped with a display
The evaluation server is
A video reproduction unit for displaying a simulation video in which a plurality of field of view areas are set in advance on the display is provided.
The electronic device further
A gaze point detection unit for detecting the gaze point of the evaluation target person in the simulation image displayed on the display is provided.
The evaluation server further
Based on the gaze point detected by the gaze point detection unit, the gaze time detection unit that detects the gaze time of the evaluation target person for each reference gaze point,
Of the plurality of visual field regions, a visual field region determination unit that determines the visual field region that the evaluation target person was gazing at for each reference gazing point, and a visual field region determination unit.
Correspondence between the reference gaze point and the gaze time obtained by the gaze time detection unit and the correspondence relationship between the view area and the reference gaze point obtained by the visual field area determination unit. Based on the above, a time integration unit that acquires all the gaze times corresponding to the visual field areas and integrates them for each visual field area, and
Based on the gaze time for each of the visual field areas calculated by the time integration unit, a first evaluation value for evaluating the deviation of the gaze time for each of the visual field areas in the plurality of visual field areas is calculated, and the gaze time detection unit. A second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated based on the gaze time detected by, and the surroundings of the vehicle are calculated based on the first evaluation value and the second evaluation value. An evaluation server including an evaluation value calculation unit that calculates a visual field evaluation value for evaluating the visual field ability. On the computer
A video reproduction means for displaying a simulation image in which a plurality of field of view areas are set in advance on a display provided in an electronic device, and
A gaze point detecting means for detecting the gaze point of the evaluation target person in the simulation image displayed on the display, and a gaze point detecting means.
Based on the gaze point detected by the gaze point detecting means, the gaze time detecting means for detecting the gaze time of the evaluation target person for each reference gaze point, and the gaze time detecting means.
Of the plurality of visual field regions, the visual field region determining means for determining the visual field region that the evaluation target person was gazing at for each of the reference gazing points,
Correspondence between the reference gaze point and the gaze time obtained by the gaze time detecting means and the correspondence relationship between the view area and the reference gaze point obtained by the view area determination means. Based on the above, a time integration means for acquiring all the gaze times corresponding to the visual field areas and integrating each of the visual field areas, and
Based on the gaze time for each of the visual field regions calculated by the time integration means, a first evaluation value for evaluating the deviation of the gaze time for each of the visual field regions in the plurality of visual field regions is calculated, and the gaze time detection means. Based on the gaze time detected by, a second evaluation value for evaluating the validity of each gaze time with respect to the visual field region is calculated, and based on the first evaluation value and the second evaluation value, the surroundings of the vehicle are moved. Evaluation value calculation means for calculating the visual field ability evaluation value for evaluating the visual field ability, and
An evaluation program characterized by executing.

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