A blue license plate segmentation and correction method

A blue and license plate technology, applied in the field of image processing, can solve the problems of large amount of calculation, slow speed, and inability to adapt to complex conditions, etc., and achieve the effect of fast correction speed, strong real-time performance, and strong robustness

Active Publication Date: 2019-06-14
MINJIANG UNIV
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Problems solved by technology

The method based on the traditional Hough transform relies on the frame of the license plate to determine the angle of inclination, and the correction cannot be completed for the case where the characters stick to the frame and there is no frame of the license plate
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  • A blue license plate segmentation and correction method
  • A blue license plate segmentation and correction method
  • A blue license plate segmentation and correction method

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[0054] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Blue license plate segmentation and correction method of the present invention, such as figure 1 shown, including the following steps:

[0056] Step S1: For the rough positioning image of the license plate, use the R channel image of the RGB channel and the V channel image of the HSV color space to construct a combined image, and then obtain the blue area binary image that highlights the blue area of ​​the license plate, and then combine it with the highlighted license plate The white area binary image of the white character area is fused to obtain a dual-area fusion binary image, thereby segmenting the complete license plate area. The specific method is:

[0057] The rough positioning image of the license plate is separated through the RGB channel to obtain the R, G, and B channel images, and then the rough positioning image...

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Abstract

The invention relates to a blue license plate segmentation and correction method. The method comprises the following steps of: 1, for a license plate coarse positioning image, constructing a combinedimage by adopting an R channel image of an RGB channel and a V channel image of an HSV color space to obtain a blue region binary image of a highlighted license plate blue region, and fusing the blueregion binary image with a white region binary image of a highlighted license plate white character region to obtain a double-region fusion binary image; 2, performing edge detection on the double-region fusion binary image, obtaining a license plate region external contour binary image on the basis, performing probability Hough transform on the license plate region external contour binary image,fitting a contour line segment, and further positioning a license plate corner point; and 3, after the license plate corner points are obtained, performing perspective transformation on the original license plate image to obtain a corrected license plate image. The method can quickly and accurately correct the license plate under complex conditions, and improves the license plate recognition rate.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a blue license plate segmentation and correction method. Background technique [0002] The license plate recognition system is a key component of the intelligent transportation system, which has a wide range of application scenarios, such as car anti-theft, traffic flow control, parking lot toll management, red light electronic police, road toll stations, etc. The general steps of the license plate recognition system can be divided into rough license plate positioning, precise license plate positioning, license plate correction, and license plate character recognition. Each step in the license plate recognition system is closely related, among which the precise positioning of the license plate and the correction of the license plate have a great influence on the accuracy of the license plate character recognition. Zheng Kaipeng, Zheng Cuihuan, etc. proposed a rapid lice...

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Application Information

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IPC IPC(8): G06T5/00G06T5/50G06T7/11G06T7/13G06T7/168G06T7/194G06T7/90G06K9/46
Inventor 余兆钗吴嘉炜李佐勇刘维娜张祖昌
Owner MINJIANG UNIV
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