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Decoding method for H.264 standard CAVLC residual error coefficient

A technology of residual coefficient and decoding method, applied in the field of video and image encoding and decoding, can solve the problems of slow operation speed and large amount of operation, and achieve the effect of reducing the number of matches, reducing storage space, and reducing the number of operations.

Active Publication Date: 2009-02-18
XFUSION DIGITAL TECH CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to improve the problems of large amount of calculation and slow calculation speed in the existing decoding method, and to provide a programmable decoding method of high-efficiency context-adaptive coding coefficients

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  • Decoding method for H.264 standard CAVLC residual error coefficient
  • Decoding method for H.264 standard CAVLC residual error coefficient
  • Decoding method for H.264 standard CAVLC residual error coefficient

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Embodiment Construction

[0035] The decoding process of the residual coefficient of adaptive variable length coding based on the context of the H.264 protocol standard is a complex process, and the residual coefficient is scanned from high frequency to low frequency in reverse zigzag (such as figure 1 After that, all codewords are analyzed one by one. Existing decoding methods usually include the following steps:

[0036] Step 1: Decode the binary group of the number of non-zero coefficients and the number of trailing coefficients, where the number of trailing coefficients specifically refers to the non-zero, absolute value in the one-dimensional coefficient matrix obtained by scanning from low frequency to high frequency The number of consecutive coefficients of 1. The maximum number of trailing coefficients is 3, and more than 3 ±1 coefficients are regarded as ordinary coefficients, and the decoding method adopts the decoding method of the number of 0s before each non-zero coefficient. The specifi...

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Abstract

The invention discloses a decoding method of the H.264 context self-adapting coding residual error coefficient. The method comprises following steps: firstly decoding the quantity of the nonzero coefficient and a binary group of the trailing coefficient quantity; then decoding the sign digit of the trailing coefficient; then decoding the extent value of the nonzero coefficient of the trailing coefficient; finally decoding the quantity of the previous zero number of the last nonzero coefficient and the quantity of the previous zero number of each nonzero coefficient. The binary group decoding of the nonzero coefficient and a binary group of the trailing coefficient can confirm the length of the code information according to the three-dimensional code list and the predetermined bit digits, further confirming the content of the binary group; the quantity of the nonzero coefficient and a binary group of the trailing coefficient quantity and the extent value of the nonzero coefficient use the quantity obtained by the method of two bytes of the prior zero. The method can enhance the decoding speed of the CAVLC code flow.

Description

technical field [0001] The invention relates to the field of video and image coding and decoding, in particular to a decoding method of H.264 context adaptive variable length coding (CAVLC) residual coefficients. Background technique [0002] The latest international video coding standard H.264 stipulates that its entropy coding can adopt CAVLC or context-adaptive arithmetic coding (CABAC). The computational complexity is much lower than that of CABAC, and it has achieved a good compromise between coding efficiency and complexity. The H.264 protocol standard especially recommends this technology for basic layer applications such as video surveillance and video conferencing. These applications require real-time decoding of code streams, and in CAVLC, different decoding methods are used for different syntax elements: direct or indirect exponential Golomb codes are used for decoding macroblock types, motion vectors, etc., and the decoding of residual coefficients is due to the ...

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/13
Inventor 张冬明张勇东李锦涛
Owner XFUSION DIGITAL TECH CO LTD
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