Testing method and testing device for driving recorder

Abstract

The invention relates to a vehicle distance measuring method, in particular to a method for testing a driving recorder of a road test vehicle comprising a touch display screen and a distance measuring lens, which comprises the following steps of: detecting a touch event occurring on the touch display screen; setting a first sensor model as a target model according to the touch event and setting a test distance according to the target model; detecting the speed of the road test vehicle, and when the road test vehicle continuously runs at a speed greater than a threshold speed for a distance exceeding a threshold distance, shooting a target image containing the license plate of the target vehicle by using the distance measuring lens; calculating the current distance between the road test vehicle and the license plate of the target vehicle according to the target image; if the current distance conforms to the test distance, starting at least one to-be-tested driving recorder conforming to the target model; and storing at least one recorded image shot by the at least one driving recorder to be tested.

Description

Technical Field

[0001] The invention relates to a vehicle distance measurement method, in particular to a driving recorder testing method and testing device. Background Art

[0002] In the road test of the driving recorder, the distance between the road test vehicle and the license plate of the vehicle in front is usually obtained through the driving experience of the road test vehicle driver and the evaluation of the road markings, or through the test personnel using a distance meter in the road test vehicle.

[0003] However, the distance between the test vehicle and the vehicle ahead is only roughly estimated based on the test vehicle driver's driving experience and road markings. The actual road markings are prone to oil stains, damage, and even environmental shadows, which can cause discrepancies in the calculated distance data. When using a rangefinder outdoors, the rangefinder is often affected by outdoor light, which can cause instability in the distance between the test vehicle and the vehicle ahead. In addition, the distance between the test vehicle and the vehicle ahead is measured by the test personnel using the rangefinder in the test vehicle, which means that the distance between the test vehicle and the vehicle ahead is not stable. During the road test, in addition to the driver of the road test vehicle, at least one more tester must be added to operate the distance meter in the road test vehicle, resulting in the test unit having to spend a lot of manpower to conduct the test in the road test of the driving recorder. In view of the above situation, the current vehicle distance measurement method cannot stably provide good measurement data quality for the testers, resulting in large fluctuations in the results of the lens image road test, reduced confidence, and the testers even need to repeat the road test to repeatedly verify the road test results, ultimately increasing the costs of personnel, time, etc. Summary of the invention

[0004] Therefore, an object of the present invention is to provide a testing method and a testing device for a driving recorder.

[0005] In one embodiment, a method for testing a driving recorder is applicable to a road test vehicle, the road test vehicle comprising a touch display screen and a ranging lens, the testing method comprising: detecting a touch event occurring on the touch display screen, setting a first sensor model as a target model according to the touch event and setting a test distance according to the target model; detecting the speed of the road test vehicle, and when the speed detection unit detects that the road test vehicle is currently traveling continuously at a speed greater than a threshold speed for more than a threshold distance, triggering the ranging lens to capture a target image including a license plate of a target vehicle; calculating a current distance between the road test vehicle and the license plate of the target vehicle according to the target image; if the current distance meets the test distance, activating at least one driving recorder to be tested that meets the target model; and storing at least one fixed time length recorded image captured by the at least one driving recorder to be tested that meets the target model.

[0006] In particular, it further includes: a processing unit analyzing the recorded image of at least a fixed time length to determine whether the correct license plate number of the target vehicle can be identified through the recorded image of at least a fixed time length, wherein if the identified license plate number is determined to be wrong, the processing unit sends an identification failure message to the touch display screen and generates a retest option on the touch display screen.

[0007] In particular, in the step of calculating the current distance between the road test vehicle and the license plate of the target vehicle according to the target image, the current distance is calculated according to the pixel value of the license plate of the target vehicle in the target image.

[0008] In particular, the method further comprises: displaying the recorded image of at least a fixed time length shot by the tested driving recorder on the touch display screen; and displaying the current distance on the touch display screen.

[0009] In particular, it further includes: when confirming that the retest option is triggered.

[0010] In particular, it further includes: detecting another touch event occurring on the touch display screen, setting a second sensor model as another target model according to the another touch event and setting another test distance according to the another target model; detecting the speed of the road test vehicle, and when the road test vehicle continuously travels at a speed greater than the threshold speed and exceeds the threshold distance, using the distance measurement lens to capture another target image including the license plate of the target vehicle; calculating another current distance between the road test vehicle and the license plate of the target vehicle according to the another target image; when the another current distance meets the another test distance, shutting down the at least one driving recorder to be tested that does not meet the another target model, and starting the at least one driving recorder to be tested that meets the another target model; and storing at least one recorded image captured by the at least one driving recorder to be tested that meets the another target model.

[0011] In particular, the method further includes: displaying the first sensor model and the second sensor model on the touch display screen according to the touch event and the another touch event.

[0012] In particular, it further includes: when the ranging lens captures the target image including the license plate of the target vehicle, determining whether the ambient light brightness of the target vehicle is greater than a threshold range; and when the ambient light brightness of the target vehicle is between the threshold range, calculating the current distance between the road test vehicle and the license plate of the target vehicle based on the target image.

[0013] In one embodiment, a test device for a driving recorder is suitable for a road test vehicle. The test device includes a rangefinder lens, a touch display screen, a speed detection unit, a processing unit, and a memory unit. The touch display screen is used to detect a touch event occurring on the touch display screen, and the processing unit is used to set a first sensor model as a target model according to the touch event and set a test distance according to the target model. The speed detection unit is used to detect the speed of the road test vehicle, and when the speed detection unit detects that the road test vehicle continuously travels at a speed greater than a threshold speed for more than a threshold distance, the processing unit turns on the rangefinder lens so that the rangefinder lens captures a target image including a license plate of a target vehicle; the processing unit calculates a current distance between the road test vehicle and the license plate of the target vehicle according to the target image. If the current distance meets the test distance, the processing unit starts at least one driving recorder to be tested that meets the target model. The memory unit is used to store at least one recorded image captured by the at least one driving recorder to be tested that meets the target model.

[0014] In particular, it further comprises: an analysis unit for analyzing the at least one recorded image to determine whether the correct license plate number of the target vehicle can be identified through the at least one recorded image.

[0015] In particular, the processing unit calculates the current distance according to the pixel value of the license plate of the target vehicle in the target image.

[0016] In particular, the touch display screen is further used to display the recorded image captured by the vehicle driving recorder to be tested and the current distance.

[0017] In particular, the touch display screen is further used to display the result of the analysis unit analyzing the at least one recorded image to determine whether the correct license plate number of the target vehicle can be identified through the at least one recorded image.

[0018] In particular, the touch display screen is further used to detect another touch event occurring on the touch display screen, the processing unit is further used to set a second sensor model as another target model according to the another touch event and set another test distance according to the another target model, and when the road test vehicle continuously travels at a speed greater than the threshold speed and exceeds the threshold distance, the processing unit turns on the ranging lens so that the ranging lens captures another target image including the license plate of the target vehicle, the processing unit calculates another current distance between the road test vehicle and the license plate of the target vehicle according to the another target image, when the other current distance meets the other test distance, the processing unit turns off the driving recorders to be tested that do not meet the other target model, and starts the driving recorders to be tested that meet the other target model, and the memory unit is further used to store other recorded images captured by the driving recorders to be tested that meet the other target model.

[0019] In particular, the touch display screen is further configured to display the first sensor model and the second sensor model according to the touch event and the another touch event.

[0020] In particular, the processing unit is further used to determine whether the ambient light brightness of the target vehicle is greater than a threshold range when the ranging lens captures the target image including the license plate of the target vehicle, and to calculate the current distance between the road test vehicle and the license plate of the target vehicle based on the target image when the ambient light brightness of the target vehicle is between the threshold range.

[0021] Compared with the prior art, in the test method and the test device of the driving recorder of the present invention, the tester automatically calculates the distance between the road test vehicle and the license plate of the target vehicle through the current image through the test device. The tester does not need to obtain the distance between the road test vehicle and the license plate of the target vehicle through the driving experience and road marking evaluation of the driver of the road test vehicle or the distance meter. Therefore, even in the road test of multiple driving recorders, the test device automatically and stably provides continuous distance measurement results between the road test vehicle and the license plate of the target vehicle, avoiding the situation where the distance measurement result is unstable and fluctuates greatly due to defects in road markings, operating errors of the tester or the influence of outdoor light. The target image is sampled, the vehicle distance is calculated, and the result is judged according to the pre-set parameters in an automated manner throughout the process, and the road test conditions are accurately mastered. The accuracy of the result can naturally be improved, and the confidence of the road test result is increased. At the same time, because there is no need to use a rangefinder, during the road test, only one tester (i.e., the driver of the road test vehicle) is required in the road test vehicle, which greatly reduces the manpower and cost consumed in road testing. In some embodiments, the touch display screen is further used to display the current distance, and when the current distance meets the test distance, the current distance displayed is displayed in green font, and when the current distance does not meet the test distance, the current distance displayed is displayed in red font. Therefore, the driver of the road test vehicle can easily maintain a certain following distance with the target vehicle by watching the touch display screen, thereby allowing at least one driving recorder to be easily tested in an environment that meets the test distance of its sensor model. And in some embodiments, the touch display screen is further used to detect another touch event occurring on the touch display screen. The processing unit is further used to set the second sensor model to another target model according to another touch event and set another test distance according to the other target model, and the tester can touch the sensor model displayed on the touch display screen to make the processing unit set the target model or another target model according to the sensor model touched by the tester. Therefore, the tester can easily switch multiple driving recorders to be tested by operating the touch display screen, so that the tester can test multiple driving recorders to be tested with multiple sensor models at one time in a single road test, thereby greatly improving the efficiency of road testing.

[0022] The detailed features and advantages of the present invention are described in detail in the following implementation examples, and the contents are sufficient to enable anyone skilled in the relevant art to understand the technical contents of the present invention and implement them accordingly. Moreover, based on the contents disclosed in this specification, the claims and the drawings of the specification, any person skilled in the relevant art can easily understand the relevant purposes and advantages of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 A block diagram of an embodiment of a road test vehicle;

[0025] Figure 2 A flowchart of an embodiment of a method for testing a driving recorder; and

[0026] Figure 3 A schematic diagram of an embodiment of a touch display screen. DETAILED DESCRIPTION

[0027] Before the present invention is described in detail, it should be noted that similar elements are denoted by the same reference numerals in the following description.

[0028] Figure 1 FIG. 1 is a block diagram of an embodiment of a road test vehicle 1. Figure 1 The road test vehicle 1 includes a driving recorder test device 10 and at least one driving recorder to be tested 20. The test device 10 is coupled to the at least one driving recorder to be tested 20. The test device 10 includes a rangefinder lens 11, a touch display screen 12, a speed detection unit 13, a processing unit 14 and a memory unit 15.

[0029] Figure 2 The present invention is a flow chart of an embodiment of a method for testing a driving recorder. Figure 3 FIG. 1 is a schematic diagram of an embodiment of a touch display screen 12. Figures 1 to 3 The touch screen 12 is used to detect a touch event occurring on the touch screen 12 (step S01). In some embodiments, the touch screen 12 may be, but is not limited to, a capacitive touch screen, a resistive touch screen, an infrared touch screen, an acoustic wave touch screen, an optical imaging touch screen, or an electromagnetic in-cell (LCD In-Cell) touch screen. In some embodiments, a touch event may be, but is not limited to, occurring through a finger or a stylus touching the touch screen 12.

[0030] The speed detection unit 13 is used to detect the speed of the road test vehicle 1 (step S02). In some embodiments, the speed detection unit 13 can be, but is not limited to, obtaining the speed of the road test vehicle 1 through an on-board diagnostic system (OBD) or a global positioning system (GPS). OBD is used to connect to the road test vehicle 1 to obtain data from the dashboard of the road test vehicle 1, including the speedometer and odometer. GPS is used to obtain the coordinate information of the road test vehicle 1 that changes with time and then convert the coordinate information of the road test vehicle 1 into the speed and travel distance of the road test vehicle 1.

[0031] The processing unit 14 is used to set the first sensor model A as the target model according to the touch event and set the test distance according to the target model (step S01). When the speed detection unit 13 detects that the road test vehicle 1 is currently driving continuously at a speed greater than a threshold speed and exceeding a threshold distance, the processing unit 14 will turn on the distance measuring lens 11 to allow the distance measuring lens 11 to capture a target image including a license plate of a target vehicle located in the same lane as the road test vehicle 1 (step S02), wherein the threshold speed and the threshold distance can be input and set through the touch display screen 12 in a pre-set manner, and the threshold speed and the threshold distance are used to define the state of the road test vehicle 1 sampling the target image during the road test process. For example, if the threshold speed is 30 kilometers per hour and the threshold distance is 50 meters, it shows that the current road test vehicle 1 has begun to stably drive on a general road and the road condition is smooth, which is suitable for the sampling state of this road test, and can improve the confidence of the results of this road test. In other cases, when the test personnel need to plan the state of stable driving on the highway for the road test sampling, the threshold speed and the threshold distance can be designed and adjusted accordingly. For example, the threshold speed is 90 kilometers per hour and the threshold distance is 600 meters. When the speed detection unit 13 detects that the road test vehicle 1 has been driving for more than 50 meters at a speed of 50 kilometers per hour, because the speed detection unit 13 detects that the road test vehicle 1 has been driving for more than 50 meters at a speed greater than 30 kilometers per hour, the processing unit 14 will turn on the ranging lens 11 to allow the ranging lens 11 to capture the target image including the license plate of the target vehicle located in the same lane as the road test vehicle 1. Figure 1 In the embodiment of the present invention, the road test vehicle 1 includes 6 driving recorders 20 to be tested, but the number of driving recorders 20 to be tested is not limited to this. For the convenience of description, the driving recorder 20 to be tested whose sensor model is the first sensor model A is called the driving recorder 21 to be tested, that is, the driving recorder 20 to be tested can be composed of driving recorders of different sensor models. Figure 1 In the embodiment, the road test vehicle 1 includes three driving recorders 21 to be tested for illustration, but the number of driving recorders 21 to be tested is not limited thereto.

[0032] The processing unit 14 then calculates the current distance D2 between the road test vehicle 1 and the license plate of the target vehicle according to the target image of the target vehicle captured by the ranging lens 11 (step S03). If the current distance D2 meets the aforementioned test distance, the processing unit 14 activates at least one of the test dashcams 20 with the target model (step S04). For example, the test distance set for the target model to be tested is 4 meters for the first sensor model A. When the processing unit 14 calculates that the current distance D2 with the license plate of the target vehicle has entered the 4-meter distance range according to the target image captured by the ranging lens 11, the processing unit 14 sends at least one activation signal to the test dashcam 21 with the first sensor model A to start the machine.

[0033] In some embodiments, the processing unit 14 may be, but is not limited to, a microprocessor, a microcontroller, a digital signal processor, a central processing unit, a programmable logic controller, a state machine, or any analog or digital device that operates signals based on operating instructions. The type of the processing unit 14 is not limited herein.

[0034] The memory unit 15 is used to store at least one recorded image captured by at least one vehicle dash cam 20 to be tested that matches the target model (step S05). In some embodiments, the memory unit 15 can be a volatile storage medium, a non-volatile storage medium, or a memory card. A volatile storage medium is, for example, a random access memory (RAM). A non-volatile storage medium is, for example, a read-only memory (ROM). The type of the memory unit 15 is not limited here.

[0035] When the speed detection unit 13 detects that the road test vehicle 1 is currently traveling continuously at a speed greater than a threshold speed for more than a threshold distance, the processing unit 14 will turn on the distance measuring lens 11 so that the distance measuring lens 11 captures a target image including the license plate of the target vehicle, and calculates the current distance D2 from the license plate of the target vehicle based on the target image. In other words, in the road test of multiple driving recorders 20, the tester automatically calculates the distance between the road test vehicle 1 and the license plate of the target vehicle through the test device 10 using the image information, and further turns on the driving recorder 20 to be tested that meets the test distance by sending a signal, and then the driving video recording test process is automatically completed by these turned-on driving recorders 20 to be tested. In the process, the tester does not need to use the driving experience of the driver of the road test vehicle 1 and the road markings to evaluate or use a rangefinder to measure the distance between the road test vehicle 1 and the license plate of the target vehicle. Therefore, there will be no inaccuracy due to sensory errors of the driver of the road test vehicle 1, defects in road markings or the influence of outdoor light. At the same time, the vehicle license plate itself is of a fixed standard size and the overall outer frame is not easily damaged. Even if there is some surface contamination, the technical impact on image recognition is relatively low. Moreover, there is no need to operate the rangefinder during driving. During the road test, only one tester (i.e., the driver of the road test vehicle 1) is required in the road test vehicle 1, which greatly reduces the manpower cost of road testing and avoids the possibility of distraction of the tester, so that the tester can concentrate on controlling the vehicle speed and improve the overall road test efficiency and safety.

[0036] In some embodiments, the testing device 10 further includes an analysis unit 16, which is used to analyze at least one recorded image captured by at least one driving recorder 20 to determine whether the correct license plate number of the target vehicle can be identified through the at least one recorded image captured by the at least one driving recorder 20 to be tested. In some embodiments, when at least one driving recorder 20 to be tested captures at least one recorded image, the analysis unit 16 simultaneously reads and analyzes at least one recorded image captured by at least one driving recorder 20 to be tested stored in the memory unit 15 to determine whether the correct license plate number of the target vehicle can be identified through the recorded image. In other words, when at least one driving recorder 20 to be tested captures, the analysis unit 16 synchronously analyzes at least one recorded image captured by at least one driving recorder 20 to be tested. At this time, the analysis unit 16 performs real-time analysis on at least one recorded image. When at least one driving recorder 20 to be tested finishes capturing at least one recorded image, the analysis unit 16 also synchronously finishes analyzing at least one recorded image captured by at least one driving recorder 20 to be tested. In some embodiments, the analysis unit 16 may be, but is not limited to, a microprocessor, a microcontroller, a digital signal processor, a central processing unit, a programmable logic controller, a state machine, or any analog or digital device that operates a signal based on an operation instruction. The type of the analysis unit 16 is not limited here.

[0037] In some embodiments, the analysis unit 16 reads and analyzes at least one recorded image shot by at least one driving recorder 20 to be tested from the memory unit 15 after at least one driving recorder 20 to be tested has finished shooting at least one recorded image. In other words, the analysis unit 16 does not perform real-time analysis on at least one recorded image. For example, if the memory unit 15 is a memory card, when at least one driving recorder 20 to be tested has finished shooting at least one recorded image, the tester inserts the memory card into the analysis unit 16. After the memory card is inserted, the analysis unit 16 starts to analyze at least one recorded image shot by at least one driving recorder 20 to be tested stored in the memory card. In some embodiments, the analysis unit 16 may be, but is not limited to, a desktop computer, a laptop computer, a server, etc.

[0038] In some embodiments, the processing unit 14 calculates the current distance D2 based on the pixel value of the license plate of the target vehicle in the target image. In some embodiments, the tester sets multiple static distances and uses a rangefinder to measure the distance from the road test vehicle 1 to the license plate of the target vehicle in a static state. When the distance from the road test vehicle 1 to the license plate of the target vehicle measured by the rangefinder meets one of the multiple static distances, the tester shoots a static image including the license plate of the target vehicle through the rangefinder lens 11. The tester shoots multiple static images corresponding to all static distances through the rangefinder lens 11, and establishes a table based on the multiple static distances and the pixel values ​​of the license plate of the target vehicle in the multiple static images corresponding to the multiple static distances. The processing unit 14 compares the pixel value of the license plate of the target vehicle in the target image with the pixel value of the license plate of the target vehicle in the multiple static images in the table by table lookup comparison to obtain the current distance D2. For example, if the multiple static distances set by the tester are 3 meters, 4 meters, 5 meters and 6 meters, when the tester uses the rangefinder to measure the distance from the road test vehicle 1 to the license plate of the target vehicle at a static state to be 3 meters, 4 meters, 5 meters or 6 meters, the tester shoots a static image including the license plate of the target vehicle through the rangefinder lens 11. The tester shoots multiple static images corresponding to 3 meters, 4 meters, 5 meters and 6 meters through the rangefinder lens 11, and creates a table based on the pixel values ​​of the license plate of the target vehicle in the multiple static images corresponding to 3 meters, 4 meters, 5 meters and 6 meters. Assume that it can be known from the table that when the static distance is 3 meters, the pixel value of the license plate of the target vehicle in the static image of 3 meters is 2856 (68 (width direction) × 42 (length direction)) and when the static distance is 4 meters, the pixel value of the license plate of the target vehicle in the static image of 4 meters is 1664 (52 (width direction) × 32 (length direction)). If the pixel value of the license plate of the target vehicle in the target image at this time is 1664, the processing unit 14 will know that the current distance D2 is 4 meters according to the table. If the pixel value of the license plate of the target vehicle in the target image at this time is 2856, the processing unit 14 will know that the current distance D2 is 3 meters according to the table.

[0039] In some embodiments, the processing unit 14 can calculate the current distance D2 by sorting out the relevant parameters such as the focal length of the ranging lens 11, the pixel value of the license plate length of the target vehicle in the target image, and the license plate length of the target vehicle into an equation through the similar triangle relationship. The relationship is:

[0040] Current distance D2(m)x=focal length of the ranging lens 11×length of the target vehicle's license plate (m)÷pixel value of the target vehicle's license plate length direction in the target image (pixels)

[0041] It is particularly noted that the focal length of the rangefinder lens 11 needs to be converted from the original focal length in millimeters (mm) to the focal length in pixels (pixels).

[0042] The pixel focal length of the ranging lens 11 can be obtained by substituting the static distance (m), the pixel value (pixels) of the license plate length of the target vehicle in the static image corresponding to the static distance, and the license plate length (m) of the target vehicle into the above formula. For example, assuming that the static distance is 3 meters, the pixel value of the license plate of the target vehicle in the static image corresponding to 3 meters is 2856 (68×42), and the license plate length of the target vehicle is a fixed size of 0.4m. At this time, it can be known that the pixel focal length of the ranging lens 11 is 3×68÷0.4=510. If the ranging lens 11 with a pixel focal length of 510 pixels is used for testing, the pixel value of the license plate of the target vehicle in the target image is 1568 (49×32). At this time, the processing unit 14 calculates the current distance D2 as 4.16 meters (510×0.4÷49=4.16) according to the above formula.

[0043] In some embodiments, the tester performs regression analysis on multiple static distances and the pixel values ​​of the license plate of the target vehicle in multiple static images corresponding to the multiple static distances to obtain a regression equation. The processing unit 14 substitutes the pixel values ​​of the license plate of the target vehicle in the target image into the regression equation to calculate the current distance D2.

[0044] See also Figure 3 In some embodiments, the touch display screen 12 is further used to display the recorded images captured by one of the tested driving recorders 20. In some embodiments, the tester can switch the recorded images captured by one of the tested driving recorders 20 currently displayed on the touch display screen 12 to the recorded images captured by another tested driving recorder 20 by operating the touch display screen 12 so as to observe multiple recorded images through the touch display screen 12. In some embodiments, the touch display screen 12 simultaneously displays multiple recorded images captured by multiple tested driving recorders 20 so that the tester can observe multiple recorded images through the touch display screen 12 at the same time.

[0045] In some embodiments, when the analysis unit 16 performs real-time analysis on the recorded image, the touch display screen 12 is further used to display the real-time analysis result of the analysis unit 16 on the recorded image shot by one of the tested driving recorders 20 so that the tester can know in real time through the touch display screen 12 whether the analysis unit 16 can identify the correct license plate number of the target vehicle through the recorded image shot by one of the tested driving recorders 20. In some embodiments, when the real-time analysis result of the analysis unit 16 on the recorded image is that the correct license plate number of the target vehicle can be identified through the recorded image, the touch display screen 12 displays the green font words "Clear", "clear" or "successful identification" at one of the four corners of the touch display screen 12, but the present invention is not limited thereto. In some embodiments, when the real-time analysis result of the analysis unit 16 on the recorded image is that the correct license plate number of the target vehicle cannot be identified through the recorded image, the touch display screen 12 displays the red font words "NotClear", "fuzzy" or "failed identification" at one of the four corners of the touch display screen 12, but the present invention is not limited thereto. In some embodiments, when the tester switches the recorded image captured by one of the driving recorders 20 to be tested currently displayed on the touch display screen 12 to the recorded image captured by another driving recorder 20 to be tested by operating the touch display screen 12, the touch display screen 12 will also change to display the real-time analysis result of the recorded image captured by the other driving recorder 20 to be tested by the analysis unit 16 according to the recorded image captured by the other driving recorder 20 to be tested. In some embodiments, when the touch display screen 12 simultaneously displays multiple recorded images captured by multiple driving recorders 20 to be tested, the touch display screen 12 will also display the real-time analysis result of the multiple recorded images captured by the multiple driving recorders 20 to be tested by the analysis unit 16.

[0046] In some embodiments, the touch display screen 12 is further used to display the current distance D2. In some embodiments, the touch display screen 12 displays the current distance D2 on the upper left of the touch display screen 12, but the present invention is not limited thereto. In some embodiments, if the current distance D2 meets the test distance, the font of the current distance D2 displayed on the touch display screen 12 is green, and if the current distance D2 does not meet the test distance, the font of the current distance D2 displayed on the touch display screen 12 is red. For example, assuming that the test distance is 4 meters, if the current distance D2 is 4 meters at this time, the upper left of the touch display screen 12 will display the words 4 meters in green font. If the current distance D2 is 6 meters at this time, the upper left of the touch display screen 12 will display the words 6 meters in red font. In some embodiments, when the processing unit 14 sets the test distance according to the target model, it also sets the tolerance value according to the target model. In some embodiments, if the current distance D2 does not meet the test distance and the difference between the current distance D2 and the test distance is less than or equal to the tolerance value, the current distance D2 displayed on the touch display screen 12 is in green font. If the current distance D2 does not meet the test distance and the difference between the current distance D2 and the test distance is greater than the tolerance value, the current distance D2 displayed on the touch display screen 12 is in red font. For example, assuming that the test distance is 4 meters and the tolerance value is 0.5 meters, if the current distance D2 is 4.5 meters at this time, because the difference between the current distance D2 and the test distance is equal to 0.5 meters, the upper left corner of the touch display screen 12 will display the words 4.5 meters in green font. If the current distance D2 is 5 meters at this time, because the difference between the current distance D2 and the test distance is greater than 0.5 meters, the upper left corner of the touch display screen 12 will display the words 5 meters in red font.

[0047] Since different driving recorders 20 to be tested may use different image sensors, and the size of the unit pixel of different image sensors is slightly different, and the optical structure design of the lens module of different driving recorders 20 to be tested is also slightly different. Therefore, in some embodiments, the processing unit 14 sets different distances as test distances according to different sensor models and characteristics of the lens module, so that different driving recorders 20 to be tested can be tested at distances that meet the design of their own sensors. And since the test device 10 is coupled to multiple driving recorders 20 to be tested, the test device 10 can switch the driving recorder 20 to be tested through electrical connection.

[0048] See also Figure 1 and Figure 3In some embodiments, the touch display screen 12 is further used to detect another touch event occurring on the touch display screen 12. The processing unit 14 is further used to set the second sensor model B to another target model according to the other touch event and to set another test distance according to the other target model. When the road test vehicle 1 is currently driving continuously at a speed greater than a threshold speed for more than a threshold distance, the processing unit 14 turns on the ranging lens 11 to allow the ranging lens 11 to capture another target image including the license plate of the target vehicle. Figure 1 In the embodiment of FIG. 1 , for convenience of description, the driving recorder 20 to be tested whose sensor model is the second sensor model B is referred to as the driving recorder 22 to be tested. Figure 1 In the embodiment, the road test vehicle 1 includes three driving recorders 22 to be tested for illustration, but the number of driving recorders 22 to be tested is not limited thereto.

[0049] The processing unit 14 calculates another current distance D2 between the rangefinder lens 11 and the license plate of the target vehicle according to another target image. When the other current distance D2 meets another test distance, the processing unit 14 turns off at least one driving recorder 20 to be tested that does not meet the other target model, and activates at least one driving recorder 20 to be tested that meets the other target model. For example, if the other target model is the second sensor model B and the other test distance is 6 meters, if the processing unit 14 calculates another current distance D2 between the road test vehicle 1 and the license plate of the target vehicle according to another target image as 6 meters and at least one driving recorder 21 to be tested is turned on, the processing unit 14 turns off at least one driving recorder 21 to be tested and activates at least one driving recorder 22 to be tested.

[0050] In some embodiments, the dash cam 21 to be tested is a dash cam 20 installed in the road test vehicle 1 and shooting toward the front of the vehicle, so the target vehicle included in the target image is the front vehicle in the same lane as the road test vehicle 1. The dash cam 22 to be tested is a dash cam 20 installed in the road test vehicle 1 and shooting toward the rear of the vehicle, so the target vehicle included in the other target image is the rear vehicle in the same lane as the road test vehicle 1. In some embodiments, the dash cam 21 to be tested is a dash cam 20 installed in the road test vehicle 1 and shooting toward the rear of the vehicle, so the target vehicle included in the target image is the rear vehicle in the same lane as the road test vehicle 1. The dash cam 22 to be tested is a dash cam 20 installed in the road test vehicle 1 and shooting toward the front of the vehicle, so the target vehicle included in the other target image is the front vehicle in the same lane as the road test vehicle 1. In some embodiments, the driving recorder 21 to be tested and the driving recorder 22 to be tested are both driving recorders 20 installed in the road test vehicle 1 and shooting toward the front of the vehicle, so the target vehicle included in the target image and the target vehicle included in another target image are both the front vehicle located in the same lane as the road test vehicle 1. In some embodiments, the driving recorder 21 to be tested and the driving recorder 22 to be tested are both driving recorders 20 installed in the road test vehicle 1 and shooting toward the rear of the vehicle, so the target vehicle included in the target image and the target vehicle included in another target image are both the rear vehicle located in the same lane as the road test vehicle 1.

[0051] The memory unit 15 is further used to store at least one recorded image captured by at least one vehicle driving recorder 20 to be tested that meets another target model.

[0052] See also Figure 3 In some embodiments, the touch display screen 12 is further used to display the first sensor model A and the second sensor model B. In some embodiments, the touch display screen 12 displays the first sensor model A and the second sensor model B at the lower right of the touch display screen 12, but the present invention is not limited thereto. Figure 3 In the embodiment of the present invention, the touch display screen 12 displays not only the first sensor model A and the second sensor model B, but also the third sensor model C, the fourth sensor model D and the fifth sensor model E. Figure 3 In the embodiment, the touch display screen 12 is used to illustrate that five sensor models are displayed, but the number of sensor models displayed on the touch display screen 12 is not limited thereto.

[0053] In some embodiments, the tester touches the sensor model displayed on the touch display screen 12 to cause the processing unit 14 to set the target model or another target model according to the sensor model touched by the tester. For example, if the tester wants to set the first sensor model A as the target model, the tester touches the first sensor model A displayed at the lower right corner of the touch display screen 12. At this time, the processing unit 14 sets the first sensor model A as the target model. If the tester wants to set the second sensor model B as another target model, the tester touches the second sensor model B displayed at the lower right corner of the touch display screen 12. At this time, the processing unit 14 sets the second sensor model B as another target model.

[0054] In some embodiments, the touch display screen 12 displays the first sensor model A and the second sensor model B only after the tester touches the touch display screen 12. In other words, the touch display screen 12 displays the first sensor model A and the second sensor model B according to a touch event and another touch event. In some embodiments, regardless of whether the tester touches the touch display screen 12, the touch display screen 12 continues to display the first sensor model A and the second sensor model B on the touch display screen 12.

[0055] During the test, the ambient light intensity of the test environment may change due to weather and objects around the road. When the change exceeds the ambient light intensity suitable for the road test project, the recorded image captured by the driving recorder 20 to be tested may be affected by the environment and produce a test result under inappropriate road test conditions. Therefore, in some embodiments, the processing unit 14 can calculate an exposure time of each frame of an environmental video when the rangefinder lens 11 captures the target image including the license plate of the target vehicle, and then perform an average operation based on a unit time (for example, 1 second) to generate an average exposure time. By comparing the change of the average exposure time within the unit time with a built-in reference value, the degree of change of the ambient light intensity of the target vehicle over time and route can be known. If the processing unit 14 determines that the change does not exceed a threshold range of the ambient light intensity defined by the road test project, the current distance D2 between the road test vehicle 1 and the license plate of the target vehicle is calculated based on the target image. For example, assuming that the threshold interval defined by the road test project is 4000-8000 Lux, when the ranging lens 11 captures the target image including the license plate of the target vehicle, the processing unit 14 simultaneously determines that the ambient light brightness of the target vehicle is 7000 Lux. Since the ambient light brightness of the target vehicle is between the threshold interval, the processing unit 14 calculates the current distance D2 between the road test vehicle 1 and the license plate of the target vehicle based on the target image. In some embodiments, the threshold interval may be, but is not limited to, 4000-8000 Lux, and may be individually defined and adjusted as required by different road test projects.

[0056] In summary, in the embodiment of the present invention, the tester automatically calculates the distance between the road test vehicle 1 and the license plate of the target vehicle through the current image through the test device 10. The tester does not need to obtain the distance between the road test vehicle 1 and the license plate of the target vehicle through the driving experience of the driver of the road test vehicle 1 and the road marking evaluation or the distance meter. Therefore, even in the road test of multiple driving recorders 20, the test device 10 automatically and stably provides continuous distance measurement results between the road test vehicle 1 and the license plate of the target vehicle, avoiding the situation where the distance measurement result is unstable and fluctuates greatly due to defects in road markings, operating errors of the tester or the influence of outdoor light. The target image is sampled, the vehicle distance is calculated, and the result is judged according to the pre-set parameters in an automated manner throughout the process. The road test conditions are accurately mastered, and the accuracy of the result can naturally be improved, thereby increasing the confidence in the road test result. At the same time, because there is no need to use a rangefinder, during the road test, only one tester (i.e., the driver of the road test vehicle 1) is required in the road test vehicle 1, which greatly reduces the manpower and cost consumed in road testing. In some embodiments, the touch display screen 12 is further used to display the current distance D2, and when the current distance D2 meets the test distance, the current distance D2 displayed is displayed in green font, and when the current distance D2 does not meet the test distance, the current distance D2 displayed is displayed in red font. Therefore, the driver of the road test vehicle 1 can easily maintain a certain following distance with the target vehicle by watching the touch display screen 12, so that at least one driving recorder 20 to be tested can be easily tested in an environment that meets the test distance of its sensor model. And in some embodiments, the touch display screen 12 is further used to detect another touch event occurring on the touch display screen 12. The processing unit 14 is further used to set the second sensor model B as another target model according to another touch event and set another test distance according to the other target model, and the tester can touch the sensor model displayed on the touch display screen 12 to make the processing unit 14 set the target model or another target model according to the sensor model touched by the tester. Therefore, the tester can easily switch the multiple driving recorders 20 to be tested by operating the touch display screen 12, so that the tester can test multiple driving recorders 20 to be tested with multiple sensor models at one time in a single road test, thereby greatly improving the efficiency of the road test.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for testing a driving recorder, applicable to a road test vehicle, the road test vehicle comprising a touch display screen and a rangefinder lens, characterized in that: The test method includes: Detecting a touch event occurring on the touch display screen, setting a first sensor model as a target model according to the touch event and determining a test distance according to the target model; Detecting the speed of the road test vehicle, when the road test vehicle continuously travels at a speed greater than a threshold speed for more than a threshold distance, capturing a target image including a license plate of a target vehicle with the ranging lens; Calculating a current distance between the road test vehicle and a license plate of the target vehicle according to the target image; When the current distance matches the test distance, activating at least one vehicle driving recorder to be tested that matches the target model; and The recorded images of at least one fixed time length shot by the at least one vehicle driving recorder to be tested that meets the target model are stored.

2. The method for testing a driving recorder according to claim 1, characterized in that: Also includes: A processing unit analyzes the recorded image of at least a fixed time length to determine whether the correct license plate number of the target vehicle can be identified through the recorded image of at least a fixed time length, wherein if the identified license plate number is determined to be incorrect, the processing unit sends an identification failure message to the touch display screen and generates a retest option on the touch display screen.

3. The method for testing a driving recorder according to claim 2, characterized in that: In the step of calculating the current distance between the road test vehicle and the license plate of the target vehicle according to the target image, the current distance is calculated according to the pixel value of the license plate of the target vehicle in the target image.

4. The method for testing a driving recorder according to claim 3, characterized in that: Also includes: Displaying the recorded images of at least a fixed time length captured by the vehicle driving recorder to be tested on the touch display screen; and The current distance is displayed on the touch display screen.

5. The method for testing a driving recorder according to claim 4, characterized in that: Also includes: When confirmed the retest option is triggered.

6. The method for testing a driving recorder according to claim 5, characterized in that: Also includes: Detecting another touch event occurring on the touch display screen, setting a second sensor model as another target model according to the another touch event and setting another test distance according to the another target model; Detecting the speed of the road test vehicle, when the road test vehicle continuously travels at a speed greater than the threshold speed and exceeds the threshold distance, capturing another target image including the license plate of the target vehicle with the ranging lens; Calculating another current distance between the road test vehicle and the license plate of the target vehicle according to the another target image; When the other current distance matches the other test distance, turning off the at least one driving recorder to be tested that does not match the other target model, and starting the at least one driving recorder to be tested that matches the other target model; and At least one recorded image captured by the at least one vehicle driving recorder to be tested that meets the another target model is stored.

7. The method for testing a driving recorder according to claim 6, characterized in that: Also includes: The first sensor model and the second sensor model are displayed on the touch display screen according to the touch event and the other touch event.

8. The method for testing a driving recorder according to claim 7, characterized in that: Also includes: When the range-finding lens captures the target image including the license plate of the target vehicle, determining whether the ambient light brightness of the target vehicle is greater than a threshold range; and When the ambient light brightness of the target vehicle is within the threshold range, the current distance between the road test vehicle and the license plate of the target vehicle is calculated according to the target image.

9. A driving recorder testing device, suitable for testing a vehicle, characterized in that: The test setup consists of: A rangefinder lens; A touch display screen, used to detect a touch event occurring on the touch display screen; A speed detection unit for detecting the speed of the road test vehicle; a processing unit, configured to set a first sensor model as a target model according to the touch event and to set a test distance according to the target model, and when the speed detection unit detects that the road test vehicle continuously travels at a speed greater than a threshold speed for more than a threshold distance, the processing unit turns on the distance-finding lens so that the distance-finding lens captures a target image including a license plate of a target vehicle, and the processing unit calculates a current distance between the road test vehicle and the license plate of the target vehicle according to the target image, and when the current distance meets the test distance, the processing unit starts at least one driving recorder to be tested that meets the target model; and A memory unit is used to store at least one recorded image captured by the vehicle driving recorders to be tested that meet the target model.

10. The driving recorder testing device according to claim 9, characterized in that: Also includes: An analysis unit is used to analyze the at least one recorded image to determine whether the correct license plate number of the target vehicle can be identified through the at least one recorded image.

11. The driving recorder testing device according to claim 10, characterized in that: The processing unit calculates the current distance according to the pixel value of the license plate of the target vehicle in the target image.

12. The driving recorder testing device according to claim 11, characterized in that: The touch display screen is further used to display the recorded image shot by the vehicle driving recorder to be tested and the current distance.

13. The driving recorder testing device according to claim 12, characterized in that: The touch display screen is further used to display the result of the analysis unit analyzing the at least one recorded image to determine whether the correct license plate number of the target vehicle can be identified through the at least one recorded image.

14. The driving recorder testing device according to claim 13, characterized in that: The touch display screen is further used to detect another touch event occurring on the touch display screen. The processing unit is further used to set a second sensor model as another target model according to the another touch event and set another test distance according to the another target model. When the road test vehicle continuously travels at a speed greater than the threshold speed and exceeds the threshold distance, the processing unit turns on the ranging lens so that the ranging lens captures another target image including the license plate of the target vehicle. The processing unit calculates another current distance between the road test vehicle and the license plate of the target vehicle according to the another target image. When the other current distance meets the other test distance, the processing unit turns off the driving recorders to be tested that do not meet the other target model and starts the driving recorders to be tested that meet the other target model. The memory unit is further used to store other recorded images captured by the driving recorders to be tested that meet the other target model.

15. The testing device for the driving recorder according to claim 14, characterized in that: The touch display screen is further used for displaying the first sensor model and the second sensor model according to the touch event and the another touch event.

16. The driving recorder testing device according to claim 15, characterized in that: The processing unit is further used to determine whether the ambient light brightness of the target vehicle is greater than a threshold range when the ranging lens captures the target image including the license plate of the target vehicle, and to calculate the current distance between the road test vehicle and the license plate of the target vehicle based on the target image when the ambient light brightness of the target vehicle is between the threshold range.

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