Method of detecting absence and coverage of license plate in real time

Abstract

The invention discloses a method of detecting absence and coverage of a license plate in real time. The method includes the steps of 1, performing license plate identification and vehicle detection through single frames; 2, correlating the license plate identified in each frame to the license plate identified in previous frames so as to allow comprehensive identification before outputting a license plate trajectory chain; 3, correlating the same vehicle occurring in multiple frames, removing a false detected target, and outputting a vehicle trajectory chain before a vehicle runs out of the frames; 4, analyzing comprehensive identification results of the license plate trajectory chain so as to judge whether coverage of characters occurs and to the digit of the covered characters; 5, matching the license plate trajectory chain and the vehicle trajectory chain, and determining that the vehicle the vehicle trajectory chain of which has no matching license plate has no license plate. The method has the advantages that the absence or coverage of the license plate can be effectively and automatically detected, the positions of covered characters in the license plate can also be judged, processing is in real time, and if most of one license plate is covered and license plate identification is unavailable, the vehicle is determined has no license plate.

Description

technical field [0001] The invention relates to a real-time detection method for a vehicle without a license plate and a license plate blocked, belonging to the field of computer vision. Background technique [0002] The Intelligent Transportation System (ITS) effectively integrates advanced information technology, data communication transmission technology, electronic sensor technology, electronic control technology and computer processing technology into the entire transportation management system. Facts have proved that the application of ITS has greatly improved The efficiency of transportation, it has played an increasingly important role in motor vehicle flow monitoring, road planning and design, and traffic command and guidance. [0003] The road checkpoint system based on video analysis is an important part of the intelligent transportation system. The system is mainly used in urban roads or highway security checkpoints and key security areas, combined with high-def...

AI Technical Summary

Problems solved by technology

However, the current license plate recognition technology and vehicle detection technology used in the bayonet system are not used in combination to provide intelligent alarms for unlicensed vehicles, nor can they provide intelligent alarms for the behavior of blocking license plates, so that such illegal events can only be detected by naked eyes.

[0005] Some scholars have designed a special algorithm for the partially occluded license plate in order to effectively recognize the rest of the unoccluded characters, but this method cannot judge whether the license plate is occluded

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