Plate number tilt correcting method based on character pre-cut
A tilt correction and pre-segmentation technology, applied in the field of pattern recognition, can solve the problems of large amount of computation, troublesome, and affect the speed of the system, and achieve the effect of small amount of computation and high efficiency
Inactive Publication Date: 2012-07-25
SHANGHAI CUBICIMAGE SOFTWARE
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Problems solved by technology
From the perspective of engineering experience, the edge characteristics of the license plate are not a stable feature. Many vehicles have blurred license plate edges. At this time, the license plate tilt correction method based on edge extraction will encounter troubles.
In addition, the tilt correction method based on the edge of the license plate will involve straight line extraction and Hough transform, which has a large amount of calculation and affects the speed of the entire system
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[0016] The license plate tilt correction method based on character pre-segmentation of the present invention will be further described below in conjunction with the drawings and embodiments. The same structures or functions in the figures are marked with the same numerals. It should be pointed out that the purpose of the drawings is only to facilitate the description of the specific embodiments of the present invention, and is not a redundant description or limitation to the scope of the present invention. In addition, the drawings are not necessarily drawn to scale.
[0017] Please refer to Figure 1 to Figure 3 As shown, the present invention is based on the license plate inclination correction method of character pre-segmentation, and this method comprises the following steps: 1) at first obtain the image of single frame by video acquisition equipment, search image space in conjunction with the feature description of license plate, position license plate sub-image I s , as...
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The invention relates to a plate number tilt correcting method based on character pre-cut and a mode identification field. The method comprises the following steps: 1) positioning a plate number sub-image; 2) calculating the optimal threshold value of the sub-image; 3) performing image binaryzation to obtain a binaryzation image; 4) horizontally projecting the binaryzation image; 5) according to the horizontal projection in step 4), pre-cutting characters to obtain the horizontal position of each character; 6) according to a character geometry spacing, calculating the character height estimation value Hc=Wc*Ratiohw; 7) searching the vertical position of each character in a neural network sorter; 8) calculating the vertical coordinate of a highest categorical measure; 9) aiming at each xi, obtaining all character centers; 10) cancelling the character center of which the categorical measure is smaller than 0.4; 11) solving a linear equation to the rest character centers to obtain a straight-line equation; 12) according to the straight line oblique angle, carrying out inverse transformation on the original plate number image to obtain the plate image after tilt correcting. The methodis stable and reliable to correct the plate number and has small needed operand and high efficiency.
Description
【Technical field】 [0001] The invention relates to the field of pattern recognition, in particular to a license plate recognition method. 【Background technique】 [0002] Intelligent Transportation System (ITS) is the frontier of transportation science and technology in the world. It is an informatization, intelligence and socialization formed by transforming the traditional transportation system with advanced electronic technology, information technology, sensor technology and system engineering technology. new transportation system. The license plate number as the identity information of the vehicle is one of the key information that the intelligent transportation system must collect, so the license plate recognition has become a core technology of the intelligent transportation system. This technology refers to that the computer automatically analyzes and searches the content in the images or videos captured by the camera, locates the area where the license plate is locate...
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IPC IPC(8): G06K9/32
Inventor 刘勇
Owner SHANGHAI CUBICIMAGE SOFTWARE