Vehicle license plate recognition method based on video

Abstract

The invention provides a vehicle license plate recognition method based on a video. According to the vehicle license plate recognition method based on the video, moving vehicles are detected and separated out with the vehicle video which is obtained through actual photographing by means of a camera serving as input, the accurate position of a vehicle license plate area is determined by conducting vertical edge extraction on a target vehicle image obtained after pre-processing, a vehicle license plate image is separated out, color correction, binaryzation and inclination correction are conducted on a vehicle license plate image, each character in the positioned vehicle license plate area is separated to serve as an independent character, feature extraction is conducted one each character, obtained feature vectors are classified through a classifier which is well trained in advance, a classification result serves as a preliminary recognition result, secondary recognition is conducted on the stained vehicle license plate characters according to a template matching algorithm imitating the visual characteristics of human eyes, and then a final vehicle license plate recognition result is obtained. The vehicle license plate recognition method based on the video has the advantages that hardware cost is reduced, the management efficiency of an intelligent transportation system is improved, the anti-jamming performance and the robustness are high, the recognition efficiency is high, and the recognition speed is high.

Description

technical field [0001] The invention belongs to the technical field of digital image processing and pattern recognition, and in particular relates to a license plate recognition method. Background technique [0002] With the rapid development of my country's national economy, there are more and more domestic motor vehicles, expressways, urban roads, parking lots, etc., and the requirements for traffic control and safety management are also increasing. The intelligent transportation system ITS (Intelligent Transportation System) has It has become the development trend of road traffic management in the 21st century and has been paid more and more attention by people. Among them, the license plate recognition system, as the core part of intelligent traffic management, provides an efficient and practical means for automated intelligent traffic management, and can be widely used in road traffic monitoring, traffic accident scene investigation, automatic recording of traffic violat...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, most of the existing license plate recognition systems rely on hardware trigger systems to capture images to identify license plates, such as magnetic induction coils, infrared, radio frequency, etc. The trigger rate is high, but the installation and maintenance costs of hardware equipment are high.

With the rapid development of computer technology, the speed of computer calculation has been significantly improved, and the video-based license plate recognition system has attracted more and more attention. Its advantage is that it avoids the dependence on hardware equipment and thus reduces the cost. The recognized image is a frame in the video, which is affected by the car's driving direction, speed, and other external disturbances, and the quality of the acquired image is not as good as that of a static image

[0005] 2. At present, most license plate recognition products that do not rely on hardware triggers have not achieved real-time detection in the true sense. Their essence is still license plate recognition under static conditions, and this feature has not revolutionized the current traffic conditions. improvement

For example, such license plate recognition products can be used for highway toll checkpoints, parking lot toll checkpoints, etc., which require the vehicle to stop and take images for recognition. Although this reduces human intervention, it still fails to achieve non-stop charging and cannot Fundamentally solve the traffic jam problem and the real non-stop automatic license plate recognition system will play a revolutionary role in the field of intelligent transportation in my country

[0006] 3. The current license plate recognition products are aimed at a single license plate system

[0007] 4. At present, the objects of most license plate recognition products are images with clear targets, simple backgrounds, and uniform illumination, especially for license plates that are defaced or maliciously blocked, there is still no good solution

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