License plate positioning method and license plate positioning device
A license plate positioning and license plate image technology, applied in the field of intelligent transportation, can solve the problems of difficulty in meeting the real-time requirements of intelligent transportation, and the extraction of vehicle structure information that cannot adapt to complex and changeable environments, so as to reduce the number of fake license plates, improve efficiency, Guaranteed accuracy
Active Publication Date: 2012-01-04
BOCOM SMART INFORMATION TECH CO LTD
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Problems solved by technology
[0009] The purpose of the embodiments of the present invention is to address the shortcomings of the existing license plate location technology, and propose a new license plate location method and a license plate location device to solve the problem that the existing number plate location technology cannot adapt to the complex and changeable environment and the vehicle structure information. extraction, and it is difficult to meet the real-time requirements of intelligent transportation
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[0051] In the specific implementation mode, for the convenience of realization, the average gray scale is used figure 2 The grayscale sum of 6 neighborhood points in b replaces, and the program of described mean value figure, vertical Sobel figure program can realize respectively in the following way:
[0052] Means plot program:
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[0055] Sobel diagram program
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[0058] This method can highlight the structural information of the license plate area in images of various complex situations, and suppress the structure of the non-license plate area, so that the license plate area can be accurately located, and the number of detected fake license plates can also be reduced.
[0059] In practical application, the average gray level and vertical Sobel gradient of the pixels in the target image are extracted, and the value of the average gray level is substituted into two parabolic equations to obtain the value of the parabola. When the ...
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The invention discloses a license plate positioning method and a device, which are used for the field of intelligent traffic for solving the problem that a license plate cannot be accurately positioned because the extraction of the structural information of the license plate in traditional license plate identification is not accurate and efficient. According to the embodiment of the invention, based on a two-value technology of a double-parabola threshold, the structural information of the license plate is extracted; the threshold can be computed without using global information; the efficiency is enhanced; simultaneously, after images under various complicated conditions are subject to two-value treatment, the structural information of a license plate area is completely reserved and obviously displayed; the structure of a non-license plate area is inhibited; finally, the license plate area is accurately positioned; the method provided by the invention is more robust and efficient relative to other two-value methods; and thereby, the final accuracy for identifying the license plate is ensured.
Description
technical field [0001] The present invention relates to the field of intelligent transportation, in particular to a license plate positioning method and a license plate positioning device, more specifically a license plate positioning method and a license plate positioning device based on a binarization technology of a double parabolic threshold method. Background technique [0002] In the field of intelligent transportation, license plate recognition is a very important technology. License plate recognition technology generally includes license plate positioning, license plate character cutting, and character recognition. The speed and accuracy of license plate positioning directly affect the quality of license plate recognition technology and are the key to the entire license plate recognition system. [0003] License plate location usually uses the structural information of the license plate to locate the area where the license plate is located by means of global search, ...
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IPC IPC(8): G06K9/00G06K9/32
Inventor 李国田广梁龙飞
Owner BOCOM SMART INFORMATION TECH CO LTD