Character pollution removal method for serial number recognition
A technology of serial numbers and characters, which is applied in the field of digital image processing, can solve problems such as ineffective decontamination, low recognition rate of serial numbers, and influence on program reliability, etc.
Active Publication Date: 2019-01-22
GUOGUANG ELECTRONICS INFORMATION TECH
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Problems solved by technology
[0004] At present, there are many methods for identifying banknote serial numbers at home and abroad, mainly for banknotes that are more than 70% new, and there is no operation for banknotes contaminated by serial numbers.
Some banknotes with serial number pollution are processed, but simple methods such as binary operations and median filter denoising cannot effectively remove pollution
At present, there is no effective method for contaminated banknotes with serial numbers, which leads to a low recognition rate of serial numbers of old polluted banknotes, which affects the reliability of the program
Method used
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[0067] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0068] Such as Figure 1-Figure 8 As shown, the character pollution removal method for serial number recognition is used in the identification process of banknote serial numbers. Before the method is implemented, the image I of the area where the serial number is located and the image I of each connected domain in the characterizing image have been obtained. circumscribed rectangle R 1 , R 2 ,...R n . Among them, each bounding rectangle R i , i=1...n has four attributes that characterize its position in the image, namely (l, r, u, b), which respectively represent the left, right, upper, and lower sides of the rectangle to the left, right, and...
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The invention discloses a method for removing character pollution for serial number recognition. The invention mainly includes determining 10 character boundary lines, preliminary determination of the circumscribed rectangular frame of a single serial number image in the area between adjacent boundary lines, and the abnormal height of a single character. Processing, single character width exception handling and other key steps. Determining the boundary line of 10 characters Use the template matching method to match the situation and location of the boundary line of the 10 character areas, including the template making method and the method of using template matching. Preliminarily determine the circumscribed rectangular frame of a single serial number image in the area between adjacent dividing lines, in which the general situation, adhesion situation, character breakage and other situations are dealt with. For the exception handling of single character height, two methods are provided to make the character height reasonable. For the abnormal processing of single character width, the present invention has a good decontamination effect and improves the recognition rate of serial numbers.
Description
technical field [0001] The invention belongs to the field of digital image processing, in particular to a character pollution removal method for serial number recognition. Background technique [0002] As currency in circulation, banknotes play a pivotal role in people's daily lives. In the process of circulation, there may be different degrees of pollution, such as the red ink pollution of the banknote itself, pencil scribbles, banknotes that have been used for a long time and become worn out, uneven illumination during banknote image collection, and unavoidable noise. It brings certain difficulties to the identification of the serial number. [0003] Banknote serial number recognition requires accurate recognition results. In order to effectively identify banknote serial numbers, in the process of serial number segmentation, it is necessary to use computer vision technology and image processing technology to process the contaminated banknote serial number areas to effecti...
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IPC IPC(8): G06K9/20G06K9/46G07D7/206
CPCG07D7/2016G06V10/225G06V10/50G06V30/10
Inventor 钟宬潘惠彬凌志峰邹相赵旦
Owner GUOGUANG ELECTRONICS INFORMATION TECH