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Arithmetic encoder sequence renormalization method used for image compression

An arithmetic coder and image compression technology, which is applied in the direction of image communication, television, electrical components, etc., can solve the problems of not overcoming defects and effectively shortening the critical path, etc., to achieve the correct effect

Inactive Publication Date: 2012-05-02
SOUTHEAST UNIV
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Problems solved by technology

The pipeline algorithm improves the read-in rate of CX / D; but it does not overcome the defect of loop iteration operation, and still cannot effectively shorten the critical path

Method used

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  • Arithmetic encoder sequence renormalization method used for image compression
  • Arithmetic encoder sequence renormalization method used for image compression
  • Arithmetic encoder sequence renormalization method used for image compression

Examples

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Embodiment Construction

[0037] The present invention designs a method for sequential renormalization of an arithmetic coder for image compression. The method reads a pair of CX / D to calculate the probability interval A and the lower boundary C of the probability interval through the total The shift step number prediction process obtains the total shift step number TS; if it does not satisfy 0.75≤A<1.5, call the renormalization process RP, shift the probability interval A to the left TS times at one time, and output no byte, In the three cases of single-byte output and double-byte output, the lower boundary C of the probability interval is shifted to the left successively. No need for any loops. Very beneficial to circuit realization.

[0038] Specific examples are as follows:

[0039] 1) After receiving a new pair of CX / D, calculate Index and MPSS according to CX, and then use Index to calculate the number of shift steps LUT and probability estimate Q from Table 1 e , the next high probability sym...

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Abstract

The invention provides an arithmetic encoder sequence renormalization method used for image compression in a joint photographic experts group (JPEG) 2000 image compression standard. The method is characterized in that: an independent total shift step number prediction rule is added to obtain a total shift step number of a probability interval A, probability interval lower boundary C is shifted successively under three conditions of without byte output, single byte output and double bytes output, thus parameter calculation can be completed sequentially in one time after reading each pair of a context CX and a code value D, and iteration loop calculation is not needed. The arithmetic encoder renormalization process method of the present invention can substitute an original part seamlessly, and other links of an arithmetic coding algorithm are not needed to be changed; no interweaving determination exists between logic branches; computation burden is reduced, data reading efficiency is effectively raised, and hardware realization is facilitated.

Description

technical field [0001] The invention relates to an arithmetic coder order renormalization method for image compression, in particular to the order algorithm structure applied to the arithmetic encoding algorithm of the Joint Photographic Experts Group (JPEG) 2000 encoding standard. Background technique [0002] At present, the latest international JPEG2000 standard (reference [1]) has the qualities of intra-frame coding, good compression effect, support for region-of-interest coding and progressive transmission, so it has been promoted in high-end digital image applications. In the encoding process, the original image is firstly processed by discrete wavelet (DWT), then the bit plane coder (BPC) is used to process the wavelet coefficient subbands to generate context and code values ​​(CX / D), and then sent to the arithmetic coder (AC) for further processing. Compression encoding. With the popularization of various high-definition digital images, higher requirements are place...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/126
Inventor 刘文松王健朱恩徐龙涛
Owner SOUTHEAST UNIV
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