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Encoding method with characteristic indication

A coding method and marking technology, applied in the field of data coding, can solve problems such as decoding errors, data reconstruction quality degradation, channel residual error sensitivity, etc., and achieve the effects of reducing the impact of bit errors, improving quality, and high coding efficiency

Inactive Publication Date: 2008-07-16
TSINGHUA UNIV
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Problems solved by technology

[0007] ■The high compression rate of the arithmetic code makes the arithmetic code more sensitive to the residual bit error of the channel. Even a single bit error will cause a complete error in the decoding of the subsequent code stream, resulting in a serious decline in the quality of data reconstruction

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Embodiment Construction

[0030] For realizing the purpose of the present invention, the work of the coding method that the present invention proposes has the feature mark and comprises the following aspects:

[0031] 1) The establishment of characteristic marks. In the code table of arithmetic code coding, there is a special code subclass called signature, which is used for error detection and error correction in error resistant coding. The feature flag referred to here refers to an information flag unit that is used to mark a certain attribute of the coded object and can be used for error detection and error correction during decoding. It can be in the form of a clock synchronization mark, watermark or other similar functions. unit.

[0032] ■ Clock synchronization flag. Using a system's global clock, the input code stream is time-sequentially marked, which can be used to deal with the synchronization problem of reconstructed information.

[0033] ■ Watermark. Using a certain characteristic of th...

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Abstract

The invention provides a coding method with characteristic indication, which belongs to the data block coding technical field. The method is characterized in that in the coding process, a bit rate is divided into bit rate sections with fixed lengths, the characteristic indication is taken as a special code word, after generated, the code word is placed at a fixed position of each bit rate section, the position and the length are set uniquely. The position and the length of the characteristic indication are used for fetching the characteristic indication on the decoding side. The fetched characteristic indication is taken as key information on the decoding side to realize the error detection and error correction functions. The invention has strong potential functions of error detection and error correction and can guarantee the high coding efficiency characteristic of an arithmetic code, thereby realizing the transmission effect of low fail encoding rate under the wireless transmission.

Description

technical field [0001] The invention relates to a data coding method, in particular to a method of coding by adding a characteristic mark. Background technique [0002] With the rapid development of communication technology, broadband communication network and multimedia communication services are the development direction of future network. High data rate is one of the main characteristics of multimedia services, and people need to reduce the data rate by means of information source coding methods with high compression rate. Arithmetic code, as a commonly used lossless compression method in information source entropy coding, is selected as an entropy coding tool by more and more latest image and video compression standards: In terms of image compression standards, the binary still image compression standard JBIG adopts A coding scheme that combines differential pulse code modulation and arithmetic codes. The still image compression standard JPEG also uses binary arithmetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/64H03M7/30H03M13/00H03M13/11H04N19/126H04N19/13H04N19/166H04N19/46H04N19/68H04N19/89
Inventor 陆建华谢旭东裴玉奎
Owner TSINGHUA UNIV
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