A method and device for testing the glare level of highway gantry fill light

Abstract

The present invention provides a method and device for testing the glare level of highway gantry fill lights. By evaluating the visual impairment caused by the fill lights, the size of the light spot in the field of view, and the duration of vision recovery, the impact on the subject's vision is comprehensively measured and assessed. Furthermore, by combining the glare indices obtained from tests on different vehicle models, a comprehensive glare index is generated, achieving a more generalizable evaluation result and calibrating the glare level of the fill lights. Furthermore, by adjusting the position and combination of the fill lights according to the scenario, the system can effectively simulate real-world scenarios for testing.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment testing, and in particular to a method and device for testing the glare level of a highway gantry fill light. Background Art

[0002] Since the abolition of highway toll booths, the widespread use of ETC (Electronic Toll Collection) for toll collection and transactions has been widely adopted. The commonly used segmented billing and exit toll collection process requires the installation of a gantry system at a specific location on the highway. The ETC gantry antenna is installed within the gantry system, and the toll amount is written to the vehicle's on-board unit (OBU) for collection at the exit.

[0003] In order to ensure that tolls can still be collected when the gantry antenna communication fails, it is necessary to use a camera to use machine vision to identify the vehicle license plate information. By using the license plate and OBU associated when applying for ETC, the toll is calculated by online fitting of the travel path when the vehicle exits the highway.

[0004] This requires gantry cameras to be able to recognize and capture information at all times of the day and night, necessitating the addition of supplemental lighting to assist in filming. However, some people have complained that the supplemental lighting used by highway gantry license plate recognition cameras is too bright at night, creating glare and seriously impacting driving safety.

[0005] In the early stages of equipment planning and construction, it is necessary to consider the impact of fill light on the driver's vision and test the glare level. Therefore, a method for testing and evaluating the glare level of fill light is urgently needed. Summary of the Invention

[0006] In view of this, an embodiment of the present invention provides a method and device for testing the glare level of a highway gantry fill light, so as to solve the problem of measuring and evaluating the glare level of the fill light on the highway.

[0007] The technical solutions of the present invention are as follows:

[0008] In one aspect, the present invention provides a method for testing the glare level of a highway gantry fill light, comprising:

[0009] Sending a fill light instruction to one or more lamps to be tested installed at a first set position of a highway gantry to light up the lamps to be tested;

[0010] The test subject observes the lamp to be tested for a specified time at a first set distance from the highway gantry in multiple designated vehicle models, and receives feedback from the test subject on a vision loss index, a visual field spot range index, and a vision recovery time index in each designated vehicle model; wherein the multiple designated vehicle models include at least trucks, vans, and sedans; the vision loss index is negatively correlated with the difference in vision of the test subject before and after the test, the visual field spot range index is negatively correlated with the spot range observed by the test subject after the test, and the vision recovery time index is negatively correlated with the time it takes for the spot to disappear in the test subject's eyes;

[0011] Calculating the vehicle type glare index obtained by the subject in each designated vehicle model test, respectively, where the vehicle type glare index is obtained by weighted summation of the vision loss index, the field of view spot range index, and the vision recovery time index;

[0012] The vehicle glare index corresponding to each designated vehicle model is weighted and summed to obtain the comprehensive glare index of the lamp to be tested.

[0013] In some embodiments, the first set position includes at least: directly above the overtaking lane, directly above the driving lane, and directly above the emergency lane.

[0014] In some embodiments, the calculation formula of the comprehensive glare index is:

[0015] δK=δT*40%+δC*40%+δM*20%;

[0016] Among them, δK represents the comprehensive glare index, δT represents the glare index of the vehicle type obtained by the subject in the test in a truck, δC represents the glare index of the vehicle type obtained by the subject in the test in a car, and δM represents the glare index of the vehicle type obtained by the subject in the test in a minivan.

[0017] In some embodiments, the calculation formula for the vehicle type glare index δT obtained by the subject in the truck test is:

[0018] δT=2*△S T +3*n T +3*t T ;

[0019] Among them, △S T It represents the visual impairment index of the subjects before and after the test in the truck, n T It represents the field of view spot range index of the subject after the test in the truck; T It represents the index of the time it takes for the subject's vision to recover after the test in the truck;

[0020] The calculation formula for the vehicle glare index δC obtained by the test subject in the car is:

[0021] δC=2*△S C +3*n C +3*t C ;

[0022] Among them, △S C It represents the visual impairment index of the subject before and after the test in the car, n C It represents the field of view spot range index of the subject after the test in the car; C It represents the index of the time it takes for the subject's vision to recover after the test in the car;

[0023] The calculation formula for the vehicle type glare index δM obtained by the test subject in the van is:

[0024] δM=2*△S M +3*n M +3*t M ;

[0025] Among them, △S M represents the subject's vision loss index before and after the test in the van, n M represents the field of view spot range index of the subject after the test in the van; t M It represents the index of the time it takes for the subject's vision to recover after the test in the van.

[0026] In some embodiments, the vision loss index is divided into intervals according to the difference in vision △S between the subject before and after the test and a score is set for each interval, wherein the difference in vision △S between the subject before and after the test is divided into 6 intervals, the vision loss index score is 1 when △S≤0, the vision loss index score is 0.8 when 0.2≥△S>0, the vision loss index score is 0.6 when 0.4≥△S>0.2, the vision loss index score is 0.4 when 0.6≥△S>0.4, the vision loss index score is 0.2 when 0.8≥△S>0.6, and the vision loss index score is 0 when △S>0.8.

[0027] In some embodiments, the field of view spot range index is divided into intervals according to the size of the spot range observed by the subject after the test, and a score is set for each interval, wherein the spot range is obtained by the subject observing and marking grid paper at a standard distance and standard interval after the test, and the spot range n observed by the subject after the test is divided into 6 intervals, when n≤30, the field of view spot range index score is 1, when 60≥n>30, the field of view spot range index score is 0.8, when 90≥n>60, the field of view spot range index score is 0.6, when 120≥n>90, the field of view spot range index score is 0.4, when 150≥n>120, the field of view spot range index score is 0.2, and when n>150, the field of view spot range index score is 0.

[0028] In some embodiments, the vision recovery time index is divided into intervals according to the time t when the light spot disappears in the subject's eye and a score is set for each interval, wherein the unit of t is seconds, and the time t when the light spot disappears is divided into 6 intervals. When t=0, the vision recovery time index score is 1, when 10≥t>0, the vision recovery time index score is 0.8, when 20≥t>10, the vision recovery time index score is 0.6, when 30≥t>20, the vision recovery time index score is 0.4, when 40≥t>30, the vision recovery time index score is 0.2, and when n>40, the vision recovery time index score is 0.

[0029] In some embodiments, the method further includes setting a plurality of standard scenes for testing, wherein the plurality of standard scenes include at least: cloudy days, foggy days, dusk and nighttime in rainy and snowy weather.

[0030] In some embodiments, the specified duration is 15 to 22.5 seconds.

[0031] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0032] The beneficial effects of the present invention are at least:

[0033] The described method and device for testing the glare level of highway gantry fill lights comprehensively measures and assesses the impact on the subject's vision by evaluating the visual impairment caused by the fill lights, the size of the light spot in the field of view, and the duration of vision recovery. Furthermore, by combining the vehicle glare indices obtained from tests on different vehicle models, a comprehensive glare index is generated, providing a more generalizable evaluation result for calibrating the glare level of the fill lights. Furthermore, by adjusting the position and combination of the fill lights according to the scenario, the device can effectively simulate real-world scenarios for testing.

[0034] Additional advantages, objects, and features of the present invention will be set forth in part in the following description and will in part become apparent to those skilled in the art upon examination of the following or may be learned by practice of the present invention. The objects and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as in the accompanying drawings.

[0035] Those skilled in the art will understand that the purposes and advantages that can be achieved by the present invention are not limited to the above specific descriptions, and the above and other purposes that can be achieved by the present invention will be more clearly understood based on the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. In the drawings:

[0037] Figure 1 This is a flow chart of a method for testing the glare level of a highway gantry fill light according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the test point layout in the highway gantry fill light glare level testing method according to one embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0040] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, the accompanying drawings only show structures and / or processing steps closely related to the solutions according to the present invention, while other details that are not closely related to the present invention are omitted.

[0041] It should be emphasized that the term "include / comprises" when used herein refers to the existence of features, elements, steps or components, but does not exclude the existence or addition of one or more other features, elements, steps or components.

[0042] It should also be noted that, unless otherwise specified, the term "connection" herein may refer not only to a direct connection but also to an indirect connection involving an intermediate.

[0043] In order to evaluate the glare level of fill lights in highway traffic scenes, the present invention provides a method for testing the glare level of highway gantry fill lights. This method can be run in the highway ETC gantry system or a dedicated test device can be set up separately. The method includes steps S101 to S104:

[0044] Step S101: sending a fill light instruction to one or more lamps to be tested installed at a first set position of a highway gantry to light up the lamps to be tested.

[0045] Step S102: The subject observes the lamp to be tested at a first set distance from the highway gantry for a specified time in multiple designated vehicle models, and receives feedback from the subject on the vision loss index, visual field light spot range index, and vision recovery time index in each designated vehicle model; wherein the multiple designated vehicle models include at least trucks, vans, and cars; the vision loss index is negatively correlated with the difference in visual acuity of the subject before and after the test, the visual field light spot range index is negatively correlated with the light spot range observed by the subject after the test, and the vision recovery time index is negatively correlated with the time it takes for the light spot in the subject's eyes to disappear.

[0046] Step S103: Calculate the vehicle model glare index obtained by the test subject in each designated vehicle model respectively. The vehicle model glare index is obtained by weighted summation of the vision loss index, the field of view spot range index and the vision recovery time index.

[0047] Step S104: performing weighted summation on the vehicle model glare index corresponding to each designated vehicle model to obtain a comprehensive glare index of the lamp to be tested.

[0048] In step S101, a command is sent to one or more preset lamps to be tested to light them up, wherein the number and position of each lamp are set according to the planning in the actual application process. For example, in a highway environment, they can be set above the overtaking lane, driving lane and emergency lane respectively. The number, illumination direction and setting position of the lamps to be tested can be configured according to the needs.

[0049] Preferably, the first set position includes at least one of the following: directly above the passing lane, directly above the driving lane, and directly above the emergency lane. That is, the luminaires to be tested are respectively placed on the highway gantry directly above the passing lane, directly above the driving lane, and directly above the emergency lane. The model of the luminaires to be tested (i.e., fill lights) can be selected based on actual needs. The illumination direction of each luminaire to be tested can be along the corresponding lane or cross-illumination between two lanes.

[0050] For example, one fill light is placed above each of the passing lane, driving lane, and emergency lane (to provide fill light for the 3-megapixel lane sign recognition camera), and one additional light is placed above the driving lane (to provide fill light for the 9-megapixel backup sign recognition camera), for a total of four fill lights. The passing and driving lane lights illuminate each other in a cross-coordinated manner, with the main optical axis of the lights positioned at the center of the lane, 22 meters from the ETC gantry. In some embodiments, multiple test points can also be set.

[0051] In step S102, the subjects can be grouped according to age and gender. In some embodiments, they can also be grouped according to whether they wear glasses. The subjects simulate the vehicle driving process in vehicles of different models, and conduct observation tests after being illuminated by the lamps to be tested. The observation distance is set according to the sensing of the lamp to be tested. For example, if the lamp to be tested is set to sense the vehicle at a distance of 22m and flash, the subject is tested at a distance of 22m from the lamp to be tested. The duration of observing the lamp to be tested can be set according to the speed of vehicles in each lane. For example, small cars are generally limited to 120-100km / h, and large trucks are limited to 100-80km / h. Considering that under normal driving conditions, after field tests, the gantry fill light can be seen from 500m away and affected. Calculations show that it takes 15 seconds to travel 500 meters at a speed of 120 km / h, 18 seconds to travel 500 meters at a speed of 100 km / h, and 22.5 seconds to travel 500 meters at a speed of 80 km / h. Ideally, a designated observation time of 15 seconds can be selected for the lamp under test. In some embodiments, the designated observation time is between 15 and 22.5 seconds.

[0052] The subjects were tested in various car models to comprehensively evaluate the glare level of the tested lamps in different models. The glare indexes obtained from the tests in different models were combined to obtain a comprehensive glare index.

[0053] Specifically, for each vehicle type, the subjects' vision loss index, visual field spot range index, and vision recovery time index were obtained before and after the test. The vision loss index was inversely proportional to the difference in vision before and after the test. The subjects tested their vision before and after the test. The vision chart was divided into six levels: 4.0, 4.2, 4.4, 4.6, 4.8, and 5.0. Each level was further divided into three levels. Taking 4.0 as an example: there are three levels: 4.0-, 4.0, and 4.0+. 4.0- means vision is less than 4.0, and 4.0+ means vision is better than 4.0, but far less than 4.2.

[0054] Furthermore, the vision loss index is divided into intervals according to the difference △S in the subjects' vision before and after the test, and a score is set for each interval. Among them, the difference △S in the subjects' vision before and after the test is divided into 6 intervals. When △S≤0, the vision loss index score is 1, when 0.2≥△S>0, the vision loss index score is 0.8, when 0.4≥△S>0.2, the score is 0.6, when 0.6≥△S>0.4, the vision loss index score is 0.4, when 0.8≥△S>0.6, the vision loss index score is 0.2, and when △S>0.8, the vision loss index score is 0.

[0055] The field of view spot range index is inversely proportional to the spot range observed by the test subject. Field of view spot is caused by looking directly at strong light, which will hinder the subject's observation of things. In order to standardize the measurement of the spot range, grid paper with set intervals can be used for measurement. The test subject observes the grid paper at a specified distance and marks the number of grids covered by the spot. For example,

[0056] A sheet of 1cm squared paper with 30 columns x 20 rows (600 squares) was used as the test tool. After looking at the fill light for 15 seconds, the subject observed the eye chart and then observed the squared paper from a distance of 0.3m. The paper should be placed at a distance that covers the entire visual field, and the viewing distance can be adjusted as needed. The subject traced the area of their field of vision blocked by the spot, counting the number of squares affected by the spot (n) according to the rule that a square larger than 1 / 2 is marked as 1 and a square smaller than 1 / 2 is marked as 0.

[0057] Specifically, the visual field spot range index is divided into intervals according to the size of the spot range observed by the subject after the test, and a score is set for each interval. The spot range is obtained by the subject observing and marking grid paper at a standard distance and standard interval after the test. The spot range n observed by the subject after the test is divided into 6 intervals. When n ≤ 30, the visual field spot range index score is 1; when 60 ≥ n > 30, the visual field spot range index score is 0.8; when 90 ≥ n > 60, the visual field spot range index score is 0.6; when 120 ≥ n > 90, the visual field spot range index score is 0.4; when 150 ≥ n > 120, the visual field spot range index score is 0.2; when n > 150, the visual field spot range index score is 0.

[0058] The vision recovery time index is inversely proportional to the time it takes for the light spot to disappear in the subject's eyes. The vision recovery time index is divided into intervals according to the time it takes for the light spot to disappear in the subject's eyes, and a score is set for each interval. The unit of t is seconds, and the time it takes for the light spot to disappear is divided into 6 intervals. When t = 0, the vision recovery time index score is 1; when 10 ≥ t > 0, the vision recovery time index score is 0.8; when 20 ≥ t > 10, the vision recovery time index score is 0.6; when 30 ≥ t > 20, the vision recovery time index score is 0.4; when 40 ≥ t > 30, the vision recovery time index score is 0.2; when n > 40, the vision recovery time index score is 0.

[0059] Furthermore, the calculation formula for the vehicle type glare index δT obtained by the test subject in the truck is:

[0060] δT=2*△S T +3*n T +3*t T ; (1)

[0061] Among them, △S T It represents the visual impairment index of the subjects before and after the test in the truck, n T It represents the field of view spot range index of the subject after the test in the truck; T It represents the index of the time it takes for the subject's vision to recover after the test in the truck.

[0062] The calculation formula for the glare index δC of the vehicle model obtained by the test subject in the car is:

[0063] δC=2*△S C +3*n C +3*t C ; (2)

[0064] Among them, △S C It represents the visual impairment index of the subject before and after the test in the car, n C It represents the field of view spot range index of the subject after the test in the car; C Indicates the index of the time it takes for the subject's vision to recover after the test in the car;

[0065] The calculation formula for the vehicle model glare index δM obtained by the test subject in the van is:

[0066] δM=2*△S M +3*n M +3*t M ; (3)

[0067] Among them, △S M represents the subjects’ visual impairment index before and after the test in the van, n MIt represents the field of view spot range index of the subject after the test in the van; t M It represents the index of the time it takes for the subjects to recover their vision after being tested in a van.

[0068] In step S104, the glare index of each vehicle model obtained by the test subject in different vehicle models can reflect the impact of the tested lamps on the driver's observation in different vehicle models. The glare index of each vehicle model is weighted and summed to obtain a comprehensive glare index.

[0069] In some embodiments, the calculation formula for the comprehensive glare index is:

[0070] δK= δT*40%+ δC*40%+ δM*20%; (4)

[0071] Among them, δK represents the comprehensive glare index, δT represents the glare index of the vehicle model obtained by the subjects in the truck test, δC represents the glare index of the vehicle model obtained by the subjects in the sedan test, and δM represents the glare index of the vehicle model obtained by the subjects in the van test.

[0072] Combining the above formulas 1 to 4, it can be seen that the higher the comprehensive glare index score, the smaller the impact of the lamp under test on the test subject, that is, the better the equipment performance.

[0073] Of course, before testing, the optical performance of the lamp under test must be checked to ensure it can effectively assist the camera in capturing vehicle images. For example, at a distance of 22m, the lamp's brightness, color temperature, and other indicators are tested. Illumination is measured and recorded at a height of 0.5m (license plate mounting height) at 22m. Tests are also conducted at five points: the left edge of the passing lane, the center of the passing lane, the right edge of the passing lane (left edge of the driving lane), the center of the driving lane, and the right edge of the driving lane. This ensures the lamp meets the basic requirements for assisting camera capture.

[0074] In some embodiments, the method further includes setting a plurality of standard scenes for testing, wherein the plurality of standard scenes include at least: cloudy days, foggy days, dusk and nighttime in rainy and snowy weather.

[0075] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0076] The present invention will be described below in conjunction with a specific embodiment:

[0077] Set up a test environment that simulates an outdoor highway environment: a clear night with no bright light sources and an ambient temperature of 0-25°C. Set up a test location, either a dedicated testing ground equipped with an ETC gantry or an open, closed road section, with a straight, obstacle-free road 100 meters before and after the gantry.

[0078] One lamp to be tested is placed above each of the overtaking lane, driving lane, and emergency lane (to provide fill light for the 3-megapixel lane sign recognition camera). An additional lamp to be tested is also placed above the driving lane (to provide fill light for the 9-megapixel backup sign recognition camera), for a total of four fill lights. The overtaking and driving lane lamps illuminate each other crosswise, and the main optical axis of the lamp is adjusted to be located at the center of the lane, 22 meters from the ETC gantry. As shown in the figure, the lamp to be tested is set 8 meters above the ground, with each test point 1.5 meters above the ground. Multiple test points are set at 18 meters, 22 meters, 25 meters, 28 meters, and 35 meters from the gantry. This embodiment tests the test point at 22 meters.

[0079] This embodiment uses an experimental group of fill lights and a control group of fill lights for comparison. The test uses a truck, a minivan, and a car.

[0080] The optical indicators of the fill lights in the experimental group and the control group were measured. Luminance and color temperature were tested at a distance of 22 meters. Illumination was measured and recorded at a height of 0.5 meters (license plate installation height) and 22 meters. Tests were conducted at five points: the left line of the passing lane, the center line of the passing lane, the right line of the passing lane (left line of the driving lane), the center line of the driving lane, and the right line of the driving lane. This confirmed the fill light's effectiveness.

[0081] To conduct a glare index test, test participants, at a distance of 22 meters, were asked to stare directly at the fill light from the driver's seat of a truck, van, or sedan with the headlights on for 15 seconds. Immediately thereafter, they observed an eye chart to determine their vision impairment, including blurred vision, the intensity and area of the light spot within their field of view, and the time it took for vision to recover. In this embodiment, the duration of staring at the lamp under test was set to 15 seconds.

[0082] To test the level of vision loss, according to the "Application and Use of Motor Vehicle Driver's License", "For those applying for large passenger vehicles, tractors, city buses, medium-sized buses, large trucks, trolleybuses or trams, the naked or corrected visual acuity of both eyes must reach 5.0 or above on the logarithmic visual acuity chart. For those applying for other types of vehicles, the naked or corrected visual acuity of both eyes must reach 4.9 or above on the logarithmic visual acuity chart." In this embodiment, the difference in vision before and after the test, △S, is divided into 6 intervals. When △S≤0, the vision loss index score is 1; when 0.2≥△S>0, the vision loss index score is 0.8; when 0.4≥△S>0.2, the score is 0.6; when 0.6≥△S>0.4, the vision loss index score is 0.4; when 0.8≥△S>0.6, the vision loss index score is 0.2; when △S>0.8, the vision loss index score is 0. Among them, △S is obtained by subtracting the vision after the test (S2) from the vision before the test (S1, i.e., sight).

[0083] To test the range of light spot impact, a sheet of 30 columns x 20 rows, 1 cm squared (600 squares total) was used as a testing tool. After looking at the fill light for 15 seconds, the subject observed the eye chart and then observed the squared paper from a distance of 0.5 m. The paper should be placed at a distance that covered the entire visual field; the viewing distance can be adjusted as needed. The subject traced the area of their field of vision blocked by the light spot. The number of squares affected by the light spot, n, was counted, with a value of 1 for a square greater than 1 / 2 and 0 for a square less than 1 / 2. The light spot range n observed by the subjects after the test was divided into 6 intervals: when n≤30, the field of view light spot range index score was 1; when 60≥n>30, the field of view light spot range index score was 0.8; when 90≥n>60, the field of view light spot range index score was 0.6; when 120≥n>90, the field of view light spot range index score was 0.4; when 150≥n>120, the field of view light spot range index score was 0.2; when n>150, the field of view light spot range index score was 0.

[0084] The vision recovery time was tested, and the time t when the spot disappeared was divided into 6 intervals. When t = 0, the vision recovery time index score was 1; when 10 ≥ t > 0, the vision recovery time index score was 0.8; when 20 ≥ t > 10, the vision recovery time index score was 0.6; when 30 ≥ t > 20, the vision recovery time index score was 0.4; when 40 ≥ t > 30, the vision recovery time index score was 0.2; when n > 40, the vision recovery time index score was 0.

[0085] Each indicator's impact on driving ability is assigned a weight of 1 to 3, with a range of 1 to 3, depending on the indicator's impact on driving ability. Vision loss level ΔS: Moderately impacts the driver's driving ability, with a weight of 2. Spot impact range n: Significantly impacts the driver's driving ability, with a weight of 3. Vision recovery time t: Significantly impacts the driver's driving ability, with a weight of 3.

[0086] Furthermore, the calculation formula for the vehicle type glare index δT obtained by the test subject in the truck is:

[0087] δT=2*△S T +3*n T +3*t T ; (1)

[0088] Among them, △S T It represents the visual impairment index of the subjects before and after the test in the truck, n T It represents the field of view spot range index of the subject after the test in the truck; T It represents the index of the time it takes for the subject's vision to recover after the test in the truck.

[0089] The calculation formula for the glare index δC of the vehicle model obtained by the test subject in the car is:

[0090] δC=2*△S C +3*n C +3*t C ; (2)

[0091] Among them, △S C It represents the visual impairment index of the subject before and after the test in the car, n C It represents the field of view spot range index of the subject after the test in the car; C Indicates the index of the time it takes for the subject's vision to recover after the test in the car;

[0092] The calculation formula for the vehicle model glare index δM obtained by the test subject in the van is:

[0093] δM=2*△S M +3*n M +3*t M ; (3)

[0094] Among them, △S M represents the subjects’ visual impairment index before and after the test in the van, n M It represents the field of view spot range index of the subject after the test in the van; t M It represents the index of the time it takes for the subjects to recover their vision after being tested in a van.

[0095] The glare index of each vehicle model, obtained by the test subject in different vehicle models, can reflect the impact of the tested lamps on the driver's observation in different vehicle models. The weighted summation of the glare index of each vehicle model is used to obtain the comprehensive glare index.

[0096] The calculation formula of comprehensive glare index is:

[0097] δK= δT*40%+ δC*40%+ δM*20%; (4)

[0098] Among them, δK represents the comprehensive glare index, δT represents the glare index of the vehicle model obtained by the subjects in the truck test, δC represents the glare index of the vehicle model obtained by the subjects in the sedan test, and δM represents the glare index of the vehicle model obtained by the subjects in the van test.

[0099] In other embodiments, a detection device may be configured to detect the size of the subject's pupil during the test, record the time points when the pupil is in a dilated state and the time points when the pupil is in a contracted state, calculate parameters such as the change in pupil size, contraction duration, and dilation duration when observing the lamp to be tested, and normalize and weightedly sum the change in pupil size, contraction duration, and dilation duration to obtain a pupil change index, which is used to calculate a comprehensive glare index.

[0100] Specifically, the control group's fill light was used for measurements in direct and cross illumination modes, while the experimental group's fill light was used for measurements in cross illumination mode. Each mode included three groups: trucks, vans, and cars. Each group had three subjects, including one without glasses and two with glasses.

[0101] The brightness, color temperature, and illumination parameters of the fill lights in the experimental group and the control group are shown in Table 1.

[0102] Table 1 Brightness, color temperature and illumination parameters of each test lane

[0103]

[0104] Furthermore, the test parameters of each test group are shown in Table 2:

[0105] Table 2 Test parameters

[0106]

[0107]

[0108] Based on the test parameters obtained in Table 2, each set of data was evaluated to obtain the glare index in Table 3.

[0109] Table 3 Glare index test results

[0110]

[0111]

[0112] In summary, the described method and device for testing the glare level of highway gantry fill lights comprehensively measures and assesses the impact on the subject's vision by evaluating the visual impairment caused by the fill lights, the size of the light spot in the field of view, and the duration of vision recovery. Furthermore, by combining the vehicle glare indices obtained from tests on different vehicle models, a comprehensive glare index is generated, achieving a more generalizable evaluation result and calibrating the glare level of the fill lights. Furthermore, by adjusting the position and combination of the fill lights according to the scenario, it can effectively simulate real-world scenarios for testing.

[0113] It should be understood by those skilled in the art that the various exemplary components, systems and methods described in conjunction with the embodiments disclosed herein can be implemented in hardware, software or a combination of the two. Whether it is specifically performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link via a data signal carried in a carrier.

[0114] It should also be noted that the exemplary embodiments described herein describe methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the steps described above. In other words, the steps may be performed in the order described in the embodiments, or in a different order, or several steps may be performed simultaneously.

[0115] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or replace features of other embodiments.

[0116] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for testing the glare level of highway gantry fill lights, characterized in that: include: Sending a fill light instruction to one or more lamps to be tested installed at a first set position of a highway gantry to light up the lamps to be tested; The test subject observes the lamp to be tested for a specified time at a first set distance from the highway gantry in multiple designated vehicle models, and receives feedback from the test subject on a vision loss index, a visual field spot range index, and a vision recovery time index in each designated vehicle model; wherein the multiple designated vehicle models include at least trucks, vans, and sedans; the vision loss index is negatively correlated with the difference in vision of the test subject before and after the test, the visual field spot range index is negatively correlated with the spot range observed by the test subject after the test, and the vision recovery time index is negatively correlated with the time it takes for the spot to disappear in the test subject's eyes; Calculating the glare index of different vehicle models obtained by the subject in each designated vehicle model test, wherein the glare index of the vehicle model is obtained by weighted summation of the vision loss index, the field of view spot range index, and the vision recovery time index; Taking a weighted sum of the glare indices of the vehicle models corresponding to the designated vehicle models to obtain a comprehensive glare index of the lamp to be tested; The calculation formula of the comprehensive glare index is: δK=δT*40%+δC*40%+δM*20%; Wherein, δK represents the comprehensive glare index, δT represents the glare index of the vehicle type tested by the subject in a truck, δC represents the glare index of the vehicle type tested by the subject in a sedan, and δM represents the glare index of the vehicle type tested by the subject in a van; The calculation formula for the vehicle type glare index δT obtained by the test subject in the truck is: δT=2*△S T +3*n T +3*t T ; Among them, △S T It represents the visual impairment index of the subjects before and after the test in the truck, n T It represents the field of view spot range index of the subject after the test in the truck; T It represents the index of the time it takes for the subject's vision to recover after the test in the truck; The calculation formula for the vehicle glare index δC obtained by the test subject in the car is: δC=2*△S C +3*n C +3*t C ; Among them, △S C It represents the visual impairment index of the subject before and after the test in the car, n C It represents the field of view spot range index of the subject after the test in the car; C Indicates the index of the time it takes for the subject's vision to recover after the test in the car; The calculation formula for the vehicle type glare index δM obtained by the test subject in the van is: δM=2*△S M +3*n M +3*t M ; Among them, △S M represents the subject's vision loss index before and after the test in the van, n M represents the field of view spot range index of the subject after the test in the van; t M It represents the index of the time it takes for the subject's vision to recover after the test in the van; The vision loss index is divided into intervals according to the difference in vision ΔS between the subject before and after the test, and a score is set for each interval. The difference in vision ΔS between the subject before and after the test is divided into 6 intervals. When ΔS ≤ 0, the vision loss index score is 1; when 0.2 ≥ ΔS > 0, the vision loss index score is 0.8; when 0.4 ≥ ΔS > 0.2, the score is 0.6; when 0.6 ≥ ΔS > 0.4, the vision loss index score is 0.4; when 0.8 ≥ ΔS > 0.6, the vision loss index score is 0.2; and when ΔS > 0.8, the vision loss index score is 0. The field of view spot range index is divided into intervals according to the size of the spot range observed by the subject after the test, and a score is set for each interval, wherein the spot range is obtained by the subject observing and marking a standard distance and standard interval grid paper after the test, and the spot range n observed by the subject after the test is divided into 6 intervals, when n≤30, the field of view spot range index score is 1, when 60≥n>30, the field of view spot range index score is 0.8, when 90≥n>60, the field of view spot range index score is 0.6, when 120≥n>90, the field of view spot range index score is 0.4, when 150≥n>120, the field of view spot range index score is 0.2, and when n>150, the field of view spot range index score is 0; The vision recovery time index is divided into intervals according to the time t when the light spot disappears in the subject's eye, and a score is set for each interval, wherein the unit of t is seconds, and the time t when the light spot disappears is divided into 6 intervals. When t=0, the vision recovery time index score is 1, when 10≥t>0, the vision recovery time index score is 0.8, when 20≥t>10, the vision recovery time index score is 0.6, when 30≥t>20, the vision recovery time index score is 0.4, when 40≥t>30, the vision recovery time index score is 0.2, and when n>40, the vision recovery time index score is 0.

2. The highway gantry fill light glare level testing method according to claim 1, characterized in that: The first set position includes at least: directly above the overtaking lane, directly above the driving lane, and directly above the emergency lane.

3. The highway gantry fill light glare level testing method according to claim 1, characterized in that: The method further includes setting a plurality of standard scenes for testing, wherein the plurality of standard scenes at least include: cloudy days, foggy days, dusk and nighttime in rainy and snowy weather.

4. The highway gantry fill light glare level testing method according to claim 1, characterized in that: The specified time length is 15 to 22.5 seconds.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method according to any one of claims 1 to 4 are implemented.

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