Automatic license plate positioning and recognition method based on complex background

Abstract

The invention relates to an automatic license plate positioning and recognition method based on a complex background. Images are acquired in a way that traffic polices or management personnel use digital cameras to take automobile pictures at any time and under various operating conditions instead of acquiring at certain fixed positions or intersections, and automatic license plate positioning and recognition are realized aiming at the random conditions. The method includes the steps: acquiring license plate images; converting color images; acquiring marginal information of the license plate images; acquiring alternate license plate zone images; precisely positioning license plate character zones; subjecting characters to single-character segmentation; and finally, using a BP (back propagation) neural network to realize recognition of license plate characters. The automatic license plate positioning and recognition method based on the complex background has the advantages of high accuracy and the like.

Description

Technical field: [0001] The invention relates to a license plate positioning and recognition method, in particular to a license plate automatic positioning and recognition method based on complex backgrounds. Background technique: [0002] The automatic license plate recognition system (License Plate Recognition, LPR) is an important part in the practical application of ITS, and occupies an important position in the traffic control and monitoring system. LPR is used in many aspects in modern social life, from static or low-speed license plate recognition systems such as parking lot vehicle management, illegal vehicle inquiry, expressway toll system, community entry and exit registration, to traffic station vehicle illegal driving, high-speed The license plate recognition system in sports such as road monitoring, which makes the LPR technology require the system to have better real-time performance while ensuring accurate license plate recognition. [0003] The key technolog...

AI Technical Summary

Problems solved by technology

[0004] Under normal circumstances, that is, without the interference of complex backgrounds, the texture information of the license plate area is relatively clear. However, the license plate recognition system under the influence of unfavorable factors such as complex backgrounds and lighting changes is still difficult. It is fixed at a certain position or intersection to obtain car images. Both the environment and the background appear single, and illegal vehicles often appear in places without cameras, which brings troubles to traffic police and management personnel, so traffic police and management personnel can use digital cameras to collect images. Randomness, but the environment and background of car pictures will be much more complicated than fixed camera collection, so designing a system that can locate, segment and recognize license plates in different complex backgrounds has great practical significance

Images