A vehicle distance detection method based on license plate size calculation
A detection method and license plate technology, applied in the field of image processing, can solve the problems of high requirements, poor real-time calculation of distance between vehicles, and large amount of calculation.
Inactive Publication Date: 2020-09-08
CHONGQING UNIV
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[0004] In the existing technical solutions for distance measurement based on license plate images, the images of each frame are processed separately, which requires a large amount of calculation, high requirements for hardware, and poor real-time performance of vehicle distance calculation. It is difficult for the driver or the controller of the vehicle to obtain the vehicle distance information in real time and take corresponding measures
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[0055] The application will be further described in detail below in conjunction with the accompanying drawings.
[0056] like figure 1 As shown, the present invention discloses a vehicle distance detection method based on license plate size calculation, comprising the following steps:
[0057] S101: collect the current frame image of the vehicle under test, and execute S102;
[0058] S102: Perform preprocessing on the current frame image, and execute S103;
[0059] S103: Perform edge detection on the preprocessed current frame image, generate a color edge image, and execute S104;
[0060] S104: Locate the license plate position of the vehicle under test based on the color edge image and obtain the license plate size, if the current frame image is the first frame image in the vehicle distance detection process, execute S105, otherwise, execute S106;
[0061] S105: Calculate the distance information of the vehicle under test based on the license plate size of the vehicle unde...
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The invention discloses a vehicle distance detection method based on license plate size calculation. Color edge image, locate the license plate position of the vehicle under test based on the color edge image and obtain the license plate size, and use the frame difference method to calculate the frame-to-frame changes of the license plate position and license plate size of the vehicle under test in the current frame image and the image of the previous frame value, if the inter-frame change value is greater than the preset change value, calculate the distance information of the tested vehicle based on the license plate size of the tested vehicle in the current frame image and acquire the image of the next frame. The present invention adopts the inter-frame difference method, which greatly reduces the calculation amount in the vehicle distance detection process, effectively improves the real-time performance of the vehicle distance detection, and enables the driver or the vehicle controller to obtain the vehicle distance information in real time and take corresponding measures. measures to improve vehicle safety.
Description
technical field [0001] The present application relates to the technical field of image processing, in particular to a vehicle distance detection method based on license plate size calculation. Background technique [0002] Road traffic accidents have brought huge losses to people's lives and property and the national economy, and traffic accidents are mainly caused by not keeping a safe distance between vehicles. It can be seen that it is very important to timely detect the distance between the current vehicle and the vehicle in front and make an early warning as a part of the advanced driver assistance system. [0003] In terms of machine vision for vehicle detection and tracking, it is mainly divided into two categories: one is based on stereo vision, and the other is based on monocular vision. The detection method based on stereo vision uses the epipolar geometric rule to measure the distance between two targets. Due to the complex feature matching, this method requires ...
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IPC IPC(8): G06K9/20G06K9/00G06K9/46G06N3/04
CPCG06V20/56G06V10/22G06V10/44G06V20/625G06N3/045
Inventor 黄扬帆周鑫余江鹏甘平刘闻通陆鹏黄林王扬黎彦芸阮祯臻
Owner CHONGQING UNIV