Method for fast identifying Data Matrix two-dimensional bar code under complicated working condition background

A two-dimensional barcode and recognition method technology, applied in the direction of electromagnetic radiation induction, etc., can solve the problems of not meeting the requirements of rapid recognition, unrecognizable, susceptible to background interference, etc.
CN102708351AActive Publication Date: 2012-10-03JIANGNAN UNIV +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
JIANGNAN UNIV
Publication Date
2012-10-03

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Abstract

The invention provides a method for fast identifying a Data Matrix two-dimensional bar code under a complicated working condition background. The method comprises the steps: firstly extracting a brim chain code based on a chain code tracking technology, then extracting a straight line segment by utilizing a straight line segment merging technology, namely dividing the chain code into sub-chain codes, merging the sub-chain codes to form the straight line segment according to the straight line segment similarity; fitting the straight line segment by utilizing the least square method technique, making an angle accurate, and finally calculating the rotation angle of the two-dimensional bar code by utilizing a vector outer product technology. By adopting the method for tracking based on the chain code, each chain code is subjected to straight line segment extraction to overcome the defects of large calculated quantity, slow recognition speed, background interference and non-recognition caused by different polarities. The method has the advantages of small calculated quantity, and is not affected by the polarity of the bar code; the image is gone through just twice; both the black bar code or white bar code can be identified, and the recognizable minimal bar code can achieve two-dimensional bar code of three pixel unit modules and is not easily interfered by a background.
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Description

technical field

[0001] The invention relates to a fast recognition method of a Data Matrix two-dimensional barcode, in particular to a fast recognition method of a Data Matrix two-dimensional barcode under the background of complex working conditions, and belongs to the technical field of Data Matrix two-dimensional barcode recognition. Background technique

[0002] Barcode technology is an automatic identification technology formed in computer application practice. Since its appearance in the early 1970s, one-dimensional barcode technology has been widely used. However, with the development of modern high-tech, there is an urgent need to use barcodes to express more information in a limited geometric space, so as to meet the ever-changing information needs. Two-dimensional barcode technology was born to meet people's needs. The traditional one-dimensional barcode only has the verification function, but no error correction ability. The two-dimensional barcode has a strong...

Claims

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