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A table structure for video entropy decoding search and corresponding decoding method

A look-up table and entropy decoding technology, applied in the field of video encoding and decoding, can solve the problems of time occupation and decoding efficiency reduction, and achieve the effect of reducing the number of times of use and improving decoding efficiency

Active Publication Date: 2008-05-28
HISENSE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the condition register is used many times in table switching, etc., it takes a certain amount of time when jumping, which reduces the decoding efficiency

Method used

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  • A table structure for video entropy decoding search and corresponding decoding method
  • A table structure for video entropy decoding search and corresponding decoding method
  • A table structure for video entropy decoding search and corresponding decoding method

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Embodiment Construction

[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] Referring to FIG. 1 , it illustrates a structural diagram of an embodiment of a video entropy decoding lookup table structure proposed by the present invention. As shown in the figure, the present embodiment takes the AVS video standard as an example; the look-up table structure includes 64 (0-63) storage units, and 0-58 storage units include an EOB (end bit) tag field, an ESC (escape bit) ) flag field, Run (run length) field, Level (quantization coefficient) field, next_TabNum (table number of the next lookup table) field, wherein each storage unit occupies 32 bits, the EOB flag field occupies 1 bit, and the ESC flag field occupies 1 The Run field occupies 8 bits, the Level field occupies 5 bits, the next_TabNum field occupies 3 bits, and the remaining bits are filled with 0. Among them, the 59-63 memory cells are all filled with bina...

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Abstract

The invention discloses a video entropy decoding searching table structure, which comprises a next searching table number word-section. Because the table number of a next searching table is directly stored in the searching table of the searching table structure in the invention, when being decoded, the table number of the next searching table is required to be read, the table is not required to be switched to operate continuously the table look-up calculation, thereby the table look-up times and the operating times of a condition register are reduced. The invention also provides a video entropy decoding method for applying the searching table structure simultaneously, and the decoding efficiency is obviously improved.

Description

technical field [0001] The invention relates to the field of video encoding and decoding, in particular to a video entropy decoding lookup table structure and a corresponding video entropy decoding method. Background technique [0002] The AVS standard uses the CA-2D-VLC (two-dimensional variable length adaptive coding based on context) method for coding. For each quantized coefficient block, its decoding process is roughly as follows: [0003] First, read and analyze the code stream to obtain the transform and quantization coefficients. If the value of the transformation quantization coefficient is less than 59, use the transformation quantization coefficient as an index to look up the table according to the corresponding table number to obtain the values ​​of Level (quantization coefficient) and Run (run length); otherwise, analyze the code stream to obtain the difference value of the transformation quantization coefficient . At this time, the value of Run is determined...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/124H04N19/13H04N19/157H04N19/70
Inventor 刘微张宏波
Owner HISENSE