Method for detecting handwriting mark symbols for bill document positioning grids
A technology of marking symbols and detection methods, which is applied in the field of image processing, can solve the problems of invalid frame line detection and difficulty in local edge detail features, and achieve the effects of good direction recognition ability, convenient operation and high detection accuracy
Active Publication Date: 2014-08-06
JIANGSU SUNBOON INFORMATION TECH
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[0004] However, in the processing of the above traditional methods, it is difficult to effectively express some important details such as local edges, so that the detection of frame lines in complex noise backgrounds often fails.
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[0045] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0046] Such as figure 1 As shown: the handwritten marking symbols referred to in the present invention include √ symbols, slashes, circles, crosses or smears. In the figure, the √ symbol is used as an example for illustration. In order to have good versatility for bill image processing, and effectively reduce the difficulty of locating and identifying special contents of large-scale multi-category bills, the present invention includes the following steps for detecting handwritten mark symbols in the bill document positioning grid:
[0047] a. Obtain the image of the bill document;
[0048] When obtaining the receipt document image, use the camera to shoot the receipt document, and store the receipt document image in JPG mode; when using the camera to capture the image, it is necessary to calibrate the parameters of the camera. The external parameters of the cam...
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The invention relates to a method for detecting handwriting mark symbols for bill document positioning grids. The method includes the steps of obtaining an image of a bill document; subjecting the image of the bill document to multi-scale ridgelet transformation, closing calculate and chain code track to obtain a maximum closed contour of the bill document, and marking and storing the maximum closed contour; subjecting the maximum closed contour to measure based on optimal axis projection to determine an inclination angle of the maximum closed contour of the bill document; rotation the image of the bill document to a horizontal forward direction, and comparing the obtained image of the bill document with a needed bill template to dividing and extracting ticked positioning grid areas of the image of the bill document; and detecting the extracted ticked positioning grid areas by using a masking method to determining whether positioning grids of the bill document contain marked symbols. The method for detecting handwriting mark symbols for bill document positioning grids has the advantages of being convenient to operate, and high in detecting accuracy, and having good generality and robustness.
Description
technical field [0001] The invention relates to a symbol detection method, in particular to a handwritten mark symbol detection method used in a bill document positioning grid, and belongs to the technical field of image processing. Background technique [0002] In various social activities, the use of pattern recognition technology to automatically analyze, verify, retrieve and identify various bills has very important practical significance for ensuring the safety of related businesses, improving work efficiency, and increasing processing accuracy. Bill automatic processing technology has been widely valued by many research institutions and scholars at home and abroad in recent years because of its high academic value and application value. This technology mainly includes two aspects. First, the preprocessing of the bill image layout, which is The premise and basis for understanding and identifying the image content of various bills; second, analyze and recognize the prepr...
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IPC IPC(8): G06K9/20
Inventor 沈志明宋晓宁刘梓
Owner JIANGSU SUNBOON INFORMATION TECH