Long-strip-shaped small two-dimensional code recognition method

Abstract

The invention discloses a long-strip-shaped small two-dimensional code recognition method. The method comprises: after graying and binarization preprocessing on a two-dimensional code image, median filtering processing is carried out; the processed two-dimensional code image is scanned horizontally and longitudinally, an intersection point of the horizontal segment and the longitudinal segment isthe center of a positioning pattern, and a positioning point is scanned; according to the scanned positioning point, perspective transformation from a standard two-dimensional code coordinate to an image coordinate is obtained; and on the basis of the perspective transformation relationship, information of all code elements is obtained, odd-even checking is carried out on the code element information, and mask processing is carried out according to the checking and a mask method recorded in a mask row to obtain original coding data. According to the invention, the information carried by the two-dimensional code is identified quickly by scanning the two-dimensional code. The method is suitable for occasions that have a little information, have limited space, and have images with multiple two-dimensional codes needing simultaneous identification.

Description

technical field [0001] The invention relates to the technical field of two-dimensional codes, in particular to a method for identifying long and small two-dimensional codes. Background technique [0002] A two-dimensional code is a machine-readable pattern that encodes information in two dimensions. QR two-dimensional code (Quick Response, matrix two-dimensional code symbol) is the most widely used two-dimensional code at present, with large information capacity and error correction ability Strong advantages, however, QR two-dimensional codes are square, and the smallest QR two-dimensional code also has 21 code elements x21 code elements. For some scenes with limited image size of two-dimensional codes, since each code element can The area is too small for the camera to distinguish. For example, in the case where all the books in a shared bookcase have QR codes representing their information on the side for the camera to scan, such QR codes cannot be used; In the scene wher...

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Problems solved by technology

[0002] A two-dimensional code is a machine-readable pattern that encodes information in two dimensions. QR two-dimensional code (Quick Response, matrix two-dimensional code symbol) is the most widely used two-dimensional code at present, with large information capacity and error correction ability Strong advantages, however, QR two-dimensional codes are square, and the smallest QR two-dimensional code also has 21 code elements x21 code elements. For some scenes with limited image size of two-dimensional codes, since each code element can The area is too small for the camera to distinguish. For example, in the case where all the books in a shared bookcase have QR codes representing their information on the side for the camera to scan, such QR codes cannot be used; In the scene where the codes appear densely and all QR codes need to be recognized at the same time, when the QR code is recognized, since each QR code has three positioning patterns, it is necessary to match and combine all the detected positioning patterns, which will belong to the same two-dimensional Combining the positioning graphics of the code together, this step is more difficult for dense two-dimensional codes, which will increase the recognition time and reduce the recognition rate

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