License plate location method based on image cartoon-texture decomposition

Abstract

The invention discloses a plate number positioning method based on image cartoon-texture decomposition. The method includes the steps that a gray image of a plate number is subjected to cartoon-texture decomposition through a cartoon-texture decomposition model, edge information of the plate number is reserved in a cartoon part, weak edges and small scale details in the background are separated into a texture part, the edges are depicted through the gradient function of the cartoon part, and the edges of the cartoon part can be as simple as possible; an edge image is geometrically processed with a mathematic morphological method, the isolated edges are eliminated, and the plate number and similar objects can form a communicated plate number candidate area; by combining the color and the ratio of length to width of the plate number, and other prior knowledge, the plate number area is determined. The method can effectively overcome the environmental disturbance, illumination influences, background noise and other application scenario disturbance under a complex background, and the plate number area can be accurately positioned.

Description

technical field [0001] The invention belongs to the field of image processing and relates to license plate positioning in the process of license plate recognition. [0002] technical background [0003] License plate location is the basis of license plate recognition and the key to the vehicle license plate recognition system (Vehicle License Plate Recognition, referred to as VLPR). The method based on image or video processing is the main method of license plate location and recognition at present. License plate images acquired under different environments and lighting conditions, due to complex background, various types of vehicles, various colors, and light intensity, etc., the accuracy of license plate location is seriously affected. my country's license plate has some inherent characteristics, that is, the size of an ordinary license plate is 440mm×140mm, the total length of characters is 409mm, the width of a single character is 45mm, and the height is 90mm. The aspect...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of low accuracy of optical license plate positioning under the above-mentioned complex background, the present invention proposes a license plate positioning method based on image cartoon-texture decomposition. The present invention provides a new cartoon texture decomposition model and an edge detection operator. - Texture decomposition is applied to the license plate image to solve the corresponding problem and improve the accuracy and robustness of the license plate location

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