CN112101230A - Method and system for detecting starting of headlamps of vehicles passing through highway tunnel - Google Patents
Method and system for detecting starting of headlamps of vehicles passing through highway tunnel Download PDFInfo
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Abstract
The invention provides a method and a system for detecting the turn-on of a headlight of a vehicle passing through a road tunnel. Through complementation of the two detection modes, the times of using images to identify the turn-on condition of the car lamp are reduced, the requirements on image processing equipment are lowered, and the defect of insufficient illuminance detection accuracy is overcome.
Description
Technical Field
The invention relates to the technical field of traffic control systems for identifying vehicles, in particular to a method and a system for detecting the turn-on of headlamps of vehicles passing through a highway tunnel.
Background
Since most tunnels are dim, the lights must be turned on to alert the rear vehicle during the passage of the vehicle through the tunnel. However, in reality, many drivers often forget to turn on the lights after entering the tunnel, and keep turning off the lights all the time in the tunnel, which is very likely to cause traffic accidents.
In order to remind a driver to start a vehicle lamp when driving in a tunnel, the prior art provides 'a tunnel driving vehicle lamp intelligent detection reminding device' (notice number CN209543575U), and specifically discloses: through the switch that sets up, video analysis service equipment, the camera, first work management host computer, second work management host computer, video analysis service equipment, display screen and speaker, during the use, the camera is made a video recording the discernment to the vehicle that gets into the tunnel, judge the license plate number and the car light condition of vehicle, the camera passes through the net twine with information transmission to video analysis service equipment, video analysis service equipment carries out the analysis to information, if the vehicle that traveles does not turn on the light, video analysis service equipment then with information transmission to display screen and speaker, the display screen shows the license plate and shows the subtitle of reminding the driver to turn on the light, the speaker sends sound simultaneously and reminds the driver to turn on the light.
Although this method can identify the car lights of the vehicle, if all the cars are identified by image identification, image processing equipment with strong processing capability is needed to meet the requirement, and most drivers will still turn on the car lights of the vehicles when passing through the tunnel, the car lights of the vehicles are very easy to identify, and the identification by image identification is complex.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a system for detecting the turn-on of a headlight of a vehicle passing through a road tunnel, which can quickly pre-judge the turn-on condition of the headlight through illuminance detection so as to reduce the times of image identification and reduce the requirement on the processing capacity of image processing equipment.
The specific scheme is as follows:
in a first aspect, a method for detecting the turn-on of headlamps of a vehicle passing through a road tunnel is provided, which comprises the following steps:
acquiring illuminance data when a vehicle passes through a specified position and illuminance data acquired at the previous moment;
judging whether the starting condition of the vehicle lamp of the vehicle can be judged in advance based on the two sets of collected illuminance data;
if the judgment can be carried out in advance, directly determining the starting condition of the vehicle lamp;
and if the judgment cannot be carried out in advance, acquiring a front image of the vehicle, and identifying the turn-on condition of the vehicle lamp of the vehicle through the front image.
With reference to the first aspect, in a first implementable manner of the first aspect, the illuminance data includes illuminance values collected by a plurality of illuminance sensors sequentially arranged at equal intervals along the driving direction.
With reference to the first aspect or the first implementable manner of the first aspect, in a second implementable manner of the first aspect, the determining whether the lamp turning-on condition of the vehicle can be predicted based on the two sets of collected illuminance data includes:
calculating the illumination variation of the vehicle passing through the designated position according to the two sets of collected illumination data;
judging whether the illumination variation meets a preset pre-judgment condition or not;
if the judgment result is positive, the turning-on condition of the vehicle lamp can be judged in advance, otherwise, the turning-on condition of the vehicle lamp cannot be judged in advance.
With reference to the first aspect, the first or second implementable manner of the first aspect, in a third implementable manner of the first aspect, the identifying, by the front image, a lamp turning-on condition of the vehicle includes:
converting the collected front image into a gray image;
determining the height, width and center coordinates of the license plate through the gray level image;
dividing a left interested area and a right interested area according to the height, the width and the central coordinate of the license plate;
respectively counting the pixel quantity of which the gray value is equal to a preset value in the left interested region and the right interested region;
and identifying the turning-on condition of the vehicle lamp through the statistical pixel quantity of the left interested area and the right interested area.
With reference to the third implementable manner of the first aspect, in a fourth implementable manner of the first aspect, the determining the height, the width, and the center coordinate of the license plate by using the grayscale image includes:
converting the gray level image into a binary image;
positioning the position of the license plate through the binary image;
and determining the height, width and center coordinates of the license plate in the gray level image according to the license plate position.
With reference to the first aspect and any one of the fourth to the fifth implementable manners of the first aspect, in a fifth implementable manner of the first aspect, the method further includes performing corresponding processing according to the determined turning-on condition of the vehicle lamp, if the vehicle lamp is turned on, continuing to detect other vehicles passing through the specified location, and if the vehicle lamp is not turned on, recognizing license plate information of the vehicle and sending a prompt signal.
In a second aspect, a system for detecting the opening of a headlamp of a road tunnel passing vehicle is provided, which comprises:
a position detection device for detecting a vehicle position of the vehicle;
an illuminance detection device for detecting illuminance data of the vehicle;
an image capturing device for capturing a front image of a vehicle;
the control processing device is used for detecting the vehicle position of the vehicle in real time through the position detection device, acquiring illuminance data when the vehicle passes through a specified position and the illuminance data acquired at the previous moment through the illuminance detection device, and pre-judging the turn-on condition of the vehicle lamp of the vehicle according to the illuminance data;
when the control processing equipment cannot pre-judge the turn-on condition of the vehicle lamp through the illuminance data, the control processing equipment acquires a front image of the vehicle through the image acquisition equipment and identifies the turn-on condition of the vehicle lamp through the front image.
With reference to the second aspect, in a first implementable manner of the second aspect, the illuminance detection device includes a plurality of illuminance sensors, and all the illuminance sensors are sequentially arranged at equal intervals along the driving direction.
With reference to the second aspect or the first implementable manner of the second aspect, in a second implementable manner of the second aspect, the control device further includes a prompting device for sending a prompting signal according to the license plate information of the vehicle without the lamp, which is identified by the control processing device.
With reference to the second implementable manner of the second aspect and the third implementable manner of the second aspect, the notification device includes a display screen and a speaker.
Has the advantages that: the starting condition of the vehicle lamp can be pre-judged in a mode of illuminance detection, and when the starting condition of the vehicle lamp cannot be identified through illuminance detection, the starting condition of the vehicle lamp is determined in a mode of image identification, so that the number of times of image identification is reduced, and the requirement on the processing capacity of image processing equipment is lowered.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a flow chart of the detection method of the present invention;
FIG. 2 is a flow chart of determining whether the illuminance can pre-determine the turning-on condition of the vehicle light;
FIG. 3 is a flow chart of image recognition of the vehicle light turn-on condition;
FIG. 4 is a flowchart of a method for determining the height, width and center coordinates of a license plate
FIG. 5 is a system block diagram of a detection system;
fig. 6 is a schematic view of the installation position of the detection device of the detection system.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows a flow chart of a method for detecting the turn-on of headlamps of a road tunnel passing vehicle, which comprises the following steps:
step 1, acquiring illuminance data when a vehicle passes through a specified position and illuminance data acquired at the previous moment;
step 2, judging whether the starting condition of the vehicle lamp of the vehicle can be judged in advance based on the two groups of collected illuminance data;
if the judgment can be carried out in advance, directly determining the starting condition of the vehicle lamp;
and if the judgment cannot be carried out in advance, acquiring a front image of the vehicle, and identifying the turn-on condition of the vehicle lamp of the vehicle through the front image.
Specifically, first, when the passage through the detection section is measured, the illuminance data of the vehicle may be continuously collected by the illuminance sensor, and the illuminance data L when the passage through the specified position is selected therefromxNow, and illuminance data L collected at the previous timexPas. Then, based on the illuminance data LxNow、LxThe Pas pre-judges the car light opening condition of the car, and when the car light condition cannot be identified through illuminance data, the car light is collected through the cameraAnd the front image of the vehicle determines the turn-on condition of the vehicle lamp in an image recognition mode so as to ensure the detection accuracy. Through complementation of the two detection modes, the times of using images to identify the turn-on condition of the car lamp are reduced, the requirements on image processing equipment are lowered, and the defect of insufficient illuminance detection accuracy is overcome.
In this embodiment, preferably, the illuminance data includes illuminance values collected by a plurality of illuminance sensors sequentially arranged at equal intervals in the driving direction. The illuminance value collected by a single illuminance sensor is possibly influenced by a rear vehicle, so that the obtained identification result is not accurate enough, and the accuracy of the illuminance for identifying the vehicle lamp opening condition can be improved by collecting the illuminance values through a plurality of illuminance sensors.
In this embodiment, as shown in fig. 2, the determining whether the lamp-on condition of the vehicle can be predicted based on the two sets of collected illuminance data preferably includes:
step 2-1, calculating the illumination variation of the vehicle passing through the designated position according to the two sets of collected illumination data;
step 2-2, judging whether the illumination variation meets a preset pre-judgment condition;
if the judgment result is positive, the turning-on condition of the vehicle lamp can be judged in advance, otherwise, the turning-on condition of the vehicle lamp cannot be judged in advance.
Specifically, first, the illuminance data L may be passedxNow and illuminance data LxPas, the illumination variation amount corresponding to each illumination sensor can be calculated. Then, it can be determined whether each of the illuminance variation amounts respectively belongs to a predetermined pre-determination condition.
The pre-judging condition comprises a positive threshold and a negative threshold corresponding to each illuminance sensor, and the positive threshold and the negative threshold respectively correspond to the situation that the vehicle lamp is started and the situation that the vehicle lamp is not started.
If the illuminance variation of all the illuminance sensors is greater than the corresponding positive threshold, it may be determined that the lamps of the vehicle are turned on.
If all of the illuminance variations are less than the corresponding negative threshold, it may be determined that the vehicle lights are not on.
If any one of the two conditions is not met, the situation that the vehicle lamp is turned on cannot be judged in advance through the illuminance, and the situation that the vehicle lamp is turned on needs to be determined in an image recognition mode.
In this embodiment, preferably, as shown in fig. 3, the recognizing the turning-on condition of the lamps of the vehicle by the front image includes:
step 3-1, converting the collected front image into a gray image;
3-2, determining the height, width and center coordinates of the license plate through the gray level image;
3-3, dividing a left interested area and a right interested area according to the height, the width and the center coordinate of the license plate;
step 3-4, respectively counting the pixel quantity of which the gray value is equal to a preset value in the left interested area and the right interested area;
and 3-5, identifying the starting condition of the vehicle lamp through the statistical pixel quantity of the left interested area and the right interested area.
Specifically, firstly, the front image can be converted into a gray image by using the existing method, and then the height, the width and the center coordinate in the gray image of the license plate can be determined by the gray image; then, a rectangular left interested area and a rectangular right interested area are divided in the gray level image based on the central coordinate of the license plate; then, counting the number of pixels with gray values equal to a preset value in the left interested area and the right interested area, wherein the preset value corresponds to the brightness value of the vehicle lamp when the vehicle lamp is started; and finally, judging whether the pixel quantity of the left interested area and the pixel quantity of the right interested area which are larger than the preset value are both larger than the set threshold value. If the number of the automobile lamps is larger than the preset number, the automobile lamps on the left and the right of the license plate are turned on, otherwise, the automobile lamps on the left and the right of the license plate are not turned on.
In this embodiment, preferably, as shown in fig. 4, the determining the height, the width and the center coordinate of the license plate through the grayscale image includes:
step 4-1, converting the gray level image into a binary image;
4-2, positioning the license plate position through the binary image;
and 4-3, determining the height, the width and the center coordinate of the license plate in the gray level image according to the license plate position.
Specifically, firstly, a contour image of a vehicle can be extracted from a gray level image through an existing edge detection algorithm, and then the contour image is subjected to binarization processing and converted into a binary image; then, extracting a rectangular outline with the width-height ratio of 2.8-3.5 near the center of the binary image to realize license plate positioning of a passing vehicle; and finally, establishing a two-dimensional coordinate system by taking the lower left corner of the gray image as an origin, the width direction as an x axis and the height direction as a y axis, and determining the width, the height and the center coordinate of the license plate in the gray image.
In this embodiment, it is preferable that the method further includes performing corresponding processing according to the determined turning-on condition of the car light, if the car light is turned on, continuing to detect other vehicles passing through the designated location, and if the car light is not turned on, recognizing license plate information of the vehicle and sending a prompt signal by using an existing license plate recognition method.
A system block diagram of a headlight turn-on detection system for a road tunnel passing vehicle as shown in fig. 5, the detection system comprises:
a position detection device for detecting a vehicle position of the vehicle;
an illuminance detection device for detecting illuminance data of the vehicle;
an image capturing device for capturing a front image of a vehicle;
the control processing device is used for detecting the vehicle position of the vehicle through the position detection device, acquiring illuminance data when the vehicle passes through a specified position and the illuminance data acquired at the previous moment through the illuminance detection device, and pre-judging the turn-on condition of the vehicle lamp of the vehicle according to the illuminance data;
when the control processing equipment cannot pre-judge the turn-on condition of the vehicle lamp through the illuminance data, the control processing equipment acquires a front image of the vehicle through the image acquisition equipment and identifies the turn-on condition of the vehicle lamp through the front image.
Specifically, as shown in fig. 6, all the devices may be installed on the left and right lanes, the access roads or the side walls of the detection road section, and when the vehicle passes through the detection road section, the position detection device may detect the position of the vehicle. The illumination detection device can be a light illumination sensor arranged in front of the distance sensor, and the light illumination data of the vehicle is collected in real time through the illumination detection device.
The control processing device can be an industrial personal computer, and can read the illuminance data L when the vehicle passes through the designated position from the illuminance data detected by the illuminance detection device according to the determined time when the vehicle passes through the designated positionxNow, and illuminance data L collected at the previous timexPas. And can be based on the illumination data LxNow、LxPas pre-judges the turn-on condition of the vehicle lamp.
When the condition of the vehicle lamp cannot be identified through the illuminance data, the control processing equipment acquires the front image of the vehicle through the camera, and determines the opening condition of the vehicle lamp in an image identification mode to ensure the detection accuracy. Through complementation of the two detection modes, the times of using images to identify the turn-on condition of the car lamp are reduced, the requirements on image processing equipment are lowered, and the defect of insufficient illuminance detection accuracy is overcome.
In this embodiment, it is preferable that the illuminance detection device includes a plurality of illuminance sensors, and all the illuminance sensors are arranged at equal intervals in sequence in the traveling direction. Specifically, all the illuminance sensors may be arranged at equal intervals in the vehicle direction from a position 5 meters ahead of the measuring sensor to a position 30 meters ahead, and the central optical axes of the photosensitive surfaces of the illuminance sensors point to a position about 0.5 meter away from the road surface from the center of the detected lane of the tunnel cross section where the measuring sensor is located, so as to measure the illuminance value.
In this embodiment, preferably, the vehicle further includes a prompting device, configured to send a prompting signal according to the license plate information of the vehicle without driving the lamp, which is identified by the control processing device. When the control processing device determines that the vehicle is not driving, the license plate number of the vehicle can be extracted by the existing method through the front image collected previously, and a prompt signal is sent according to the license plate number to prompt the driver to pay attention to driving.
In this embodiment, preferably, the prompting device includes a display screen and a speaker, and can remind the driver to turn on the vehicle lamp in an image and voice manner.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A method for detecting the starting of a headlamp of a road tunnel passing vehicle is characterized by comprising the following steps:
acquiring illuminance data when a vehicle passes through a specified position and illuminance data acquired at the previous moment;
judging whether the starting condition of the vehicle lamp of the vehicle can be judged in advance based on the two sets of collected illuminance data;
if the judgment can be carried out in advance, directly determining the starting condition of the vehicle lamp;
and if the judgment cannot be carried out in advance, acquiring a front image of the vehicle, and identifying the turn-on condition of the vehicle lamp of the vehicle through the front image.
2. The method for detecting the turn-on of the headlamps of the road tunnel passing vehicle according to claim 1, wherein the illuminance data includes illuminance values collected by a plurality of illuminance sensors sequentially arranged at equal intervals along the driving direction.
3. The method for detecting the turn-on of the headlight of the road tunnel passing vehicle according to claim 1 or 2, wherein the judging whether the turn-on of the headlight of the vehicle can be predicted based on the two sets of collected illuminance data comprises:
calculating the illumination variation of the vehicle passing through the designated position according to the two sets of collected illumination data;
judging whether the illumination variation meets a preset pre-judgment condition or not;
if the judgment result is positive, the turning-on condition of the vehicle lamp can be judged in advance, otherwise, the turning-on condition of the vehicle lamp cannot be judged in advance.
4. The method for detecting the turn-on of the headlight of the road tunnel passing vehicle according to any one of claims 1 to 3, wherein the identifying the turn-on condition of the headlight of the vehicle by the front image comprises:
converting the collected front image into a gray image;
determining the height, width and center coordinates of the license plate through the gray level image;
dividing a left interested area and a right interested area according to the height, the width and the central coordinate of the license plate;
respectively counting the pixel quantity of which the gray value is equal to a preset value in the left interested region and the right interested region;
and identifying the turning-on condition of the vehicle lamp through the statistical pixel quantity of the left interested area and the right interested area.
5. The method for detecting the opening of the headlamps of the road tunnel passing vehicle according to claim 4, wherein the determining of the height, the width and the center coordinates of the license plate through the gray-scale image comprises:
converting the gray level image into a binary image;
positioning the position of the license plate through the binary image;
and determining the height, width and center coordinates of the license plate in the gray level image according to the license plate position.
6. The method for detecting the opening of the headlamps of the road and tunnel passing vehicle according to any one of claims 1 to 5, characterized by further comprising the steps of carrying out corresponding processing according to the determined opening condition of the lamps, if the lamps are opened, continuing to detect other vehicles passing through the specified position, and if the lamps are not opened, identifying the license plate information of the vehicles and sending out a prompt signal.
7. The utility model provides a highway tunnel current vehicle head-light opens detecting system which characterized in that includes:
a position detection device for detecting a vehicle position of the vehicle;
an illuminance detection device for detecting illuminance data of the vehicle;
an image capturing device for capturing a front image of a vehicle;
the control processing device is used for detecting the vehicle position of the vehicle in real time through the position detection device, acquiring illuminance data when the vehicle passes through a specified position and the illuminance data acquired at the previous moment through the illuminance detection device, and pre-judging the turn-on condition of the vehicle lamp of the vehicle according to the illuminance data;
when the control processing equipment cannot pre-judge the turn-on condition of the vehicle lamp through the illuminance data, the control processing equipment acquires a front image of the vehicle through the image acquisition equipment and identifies the turn-on condition of the vehicle lamp through the front image.
8. The system for detecting the opening of the headlamps of the road tunnel passing vehicle according to claim 7, wherein the illumination detection device comprises a plurality of illumination sensors, and all the illumination sensors are sequentially arranged at equal intervals along the driving direction.
9. The system for detecting the opening of the headlamps of the road tunnel passing vehicle according to claim 7 or 8, characterized by further comprising a prompting device for sending a prompting signal according to the license plate information of the vehicle without headlamps, which is identified by the control processing device.
10. The system for detecting the opening of the headlamps of the road tunnel passing vehicle according to claim 9, wherein said prompting device comprises a display screen and a speaker.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113111884A (en) * | 2021-03-26 | 2021-07-13 | 沈阳天眼智云智能技术研究院有限公司 | Video detection method for special vehicle for hazardous chemical transportation |
| CN113111884B (en) * | 2021-03-26 | 2024-05-24 | 沈阳天眼智云智能技术研究院有限公司 | Video detection method of special dangerous chemical transportation vehicle |
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