Method and system for verifying graphic coded data

Abstract

The invention relates to a checking method for image encoding data. At least one dot pattern block is printed on the surface of a printable media, each dot pattern block comprises dot pattern sub-blocks in a preset number, each dot pattern sub-block comprises sparse dot patterns, and each basic pattern corresponds to an unique numerical value or character code; image codes corresponding to the dot pattern blocks comprise at least one checking position, other positions are information positions, information corresponding to the basic patterns is divided and respectively corresponds to the checking positions, and checking position arrangement is carried out according to encoding rules. The checking method includes the following steps: decoding the dot pattern blocks read by an optical reading device into data comprising the information positions and the checking positions; and checking whether parity of various kinds of information in the information positions and checking information in corresponded checking positions is uniform or not according to the encoding rules, if yes, correct decoding can be confirmed, and if not, wrong decoding is confirmed. The checking method and a system for the image encoding data can achieve detection of a one-bit wrong code with high encoding efficiency and correct or supplement one bit missing data as much as possible.

Description

technical field [0001] The invention relates to the field of data verification, in particular to a method and system for verifying graphic coded data. Background technique [0002] In the process of information transmission, there may be data errors or loss. In order to improve the reliability of information transmission, a variety of error detection and error correction channel coding techniques have been widely used. Among them, the coding with only error detection capability is called Error detection code, the error detection code can only find that the transmitted information is wrong, but it cannot determine which bits of the information are wrong. [0003] Among the numerous check code technologies, the parity check code is a relatively common error detection code with the least overhead and capable of detecting a bit error in the data code. The coding rule of this kind of check code is: first group the data symbols to be transmitted, and add a redundant bit (ie check...

AI Technical Summary

Problems solved by technology

The coding efficiency of the Hamming code is R=k / (k+r), according to the relational expression it satisfies, it can be seen that this kind of error correction coding is due to the use of more redundant bits, which leads to low coding efficiency, especially for For the relatively fixed coding capacity in graphic coding, the number of information bits will inevitably be compressed, which will affect the information capacity contained in the graphic coding

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