LDPC (Low Density Parity Code)-based method for encoding and decoding two dimensional bar codes

A technology of two-dimensional barcode and coding method, which is applied in the field of two-dimensional barcode coding and decoding based on LDPC code, which can solve the problems of reduced recognition rate, fuzzy two-dimensional code image, easy wear and tear of printed matter, etc., and achieves easy positioning and strong error correction sex, more positioning effect

Inactive Publication Date: 2011-04-06
佟野
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Problems solved by technology

[0008] When these two-dimensional codes are used for printed products, because the printed matter is easy to wear and tear, the two-dimensional code image becomes blurred and the recognition rate is reduced. There is no good solution for the two-dimensional codes on the market at present.

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  • LDPC (Low Density Parity Code)-based method for encoding and decoding two dimensional bar codes
  • LDPC (Low Density Parity Code)-based method for encoding and decoding two dimensional bar codes
  • LDPC (Low Density Parity Code)-based method for encoding and decoding two dimensional bar codes

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Embodiment Construction

[0045]The features and technical effects of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings, which discloses a two-dimensional barcode encoding and decoding method based on LDPC codes.

[0046] attached figure 1 The basic flow of the LDPC code-based two-dimensional barcode coding method according to the present invention is shown.

[0047] Step 100, input characters to be processed. The input characters can be numbers, letters, ASCII codes, ISO-8859-1 character set, GB18030 character set, UTF8 character set, etc. Compared with the QR code encoding method commonly used in the current two-dimensional barcode, the present invention adds the encoding type of GB18030, and supports all Chinese characters by default, while the KANJI type in the QR code can only support more than 6,000 Chinese characters, and the application is no longer restricted by Chinese characters. Character encoding restrictions.

[...

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Abstract

The invention relates to an LDPC (Low Density Parity Code)-based method for encoding and decoding two dimensional bar codes, comprising the following steps of: obtaining input information according to encoding type process of the input binary data information; carrying out lengthening compression or fixed-length compression on the input information; calculating an information length required for storing according to a compressed result, obtaining the information to be encoded according to the encoding type and the compression type; carrying out LDPC encoding compression on the information to be encoded; integrating the compressed result and the version information to obtain the compressed information; and setting a flag bit and generating a two dimensional bar code image. The encoding method has large information capacity and strong error correction capability; the aspect ratio can be optionally set; and various types of encoding are supported and the locating is easier.

Description

technical field [0001] The invention relates to a method for encoding and decoding two-dimensional barcodes, in particular to a method for encoding and decoding two-dimensional barcodes based on LDPC codes. Background technique [0002] Barcode technology has developed very rapidly since it came out in the early 1970s. In just 20 years, it has been widely used in commercial circulation, warehousing, medical and health, library information, postal services, railways, transportation, production automation management and other fields. The application of bar code technology has greatly improved the speed of data collection and information processing, improved people's working and living environment, improved work efficiency, and made important contributions to the scientific and modernization of management. [0003] One-dimensional barcodes were used in the early development of barcode technology, which expresses information through horizontally arranged bars and spaces. The dat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/06G06K7/10
Inventor 佟野
Owner 佟野
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