Identification method for data matrix code
A technology of data matrix codes and recognition methods, which is applied in the direction of character and pattern recognition, instruments, and induction recording carriers, etc., can solve the problems of large storage and calculation, large calculation, and not too high, so as to reduce the calculation and Effects of storage capacity, reduced hardware requirements, and reduced computational load
Inactive Publication Date: 2007-08-15
上海炬力集成电路设计有限公司
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[0009] In the above data matrix code recognition method, the region merging and splitting method described in step 1 is an iterative method, its principle is to first find all candidate regions with closed continuous boundaries, and then repeatedly perform the operations of merging and splitting until finding The required L feature edge region in step 2 (this method has a detailed description in the ISO / IEC 16022: 2000 standard, and will not be repeated here), the storage capacity and calculation amount of this region merging and splitting method are relatively large; On the other hand, step 3 adopts the method of first finding the center points one by one, and then making vertical lines one by one to determine the grid lines. This method also has a relatively large amount of calculation. The method will make the data processing very slow and cannot meet the requirements of fast recognition. Moreover, if the dotted line edge (correction module 11) is defaced, the search for the center point may be inaccurate, resulting in a recognition error
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[0029] In order to clearly illustrate the recognition method of the data matrix code involved in the present invention, the following embodiments introduce the recognition process of the data matrix code starting from the image binarization stage from the perspective of practical application.
[0030] Referring to Fig. 2, the image information ( Not shown in the figure), the data matrix code 2 shown in FIG. 2 can be obtained after the image information is subjected to well-known binarization processing.
[0031] Similar to the data matrix code 1 shown in FIG. 1, the data matrix code 2 shown in FIG. Two adjacent edges of , including vertical characteristic edge 201 and horizontal characteristic edge 202; Correction module 21 is located at the other two adjacent edges of data matrix code 1 (respectively opposite to characteristic edge 20), which includes a plurality of black The module 210 and the white module 211 ; the data area 22 is located in the rectangular area surrounded...
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This invention relates to matrix code identification method, which comprises the following steps: using outline trace method to find out data matrix codes; searching L shape property line; computing identification module single one at vertical direction and level direction two even length; according to the length as one set of lines vertical to property as other level parallel line; according to two sets of line cross to determine black element and white one coordinate to extract the bit matrix.
Description
technical field [0001] The invention relates to the field of data identification, in particular to an identification method of a data matrix code. Background technique [0002] With the development of society, one-dimensional codes similar to barcodes have been widely used in various fields such as commerce, medicine, and logistics transportation. Commodity information represented by barcodes is widely used in commodity management and encryption of commodity information. aspects are significant. General barcodes can only express information in one horizontal direction, but do not express any information in the vertical direction, so the amount of information expressed is relatively small. With the increase of the amount of information and the continuous improvement of storage requirements, the application of barcodes has been limited due to the small information capacity. Therefore, the industry began to adopt a two-dimensional code, that is, data matrix code (data matrix ...
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IPC IPC(8): G06K7/00G06K9/36
Inventor 陆勇方伟
Owner 上海炬力集成电路设计有限公司