Code rate estimation method for video coding

A technology of video encoding and bit rate, applied in the field of video processing, can solve problems such as slow encoding speed

Active Publication Date: 2014-03-26
TSINGHUA UNIV +1
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Problems solved by technology

[0006] The technical problem solved by the present invention is that the current entropy coder adopts self-adaptive binary arithmetic coding (CABAC), and directly uses the CABAC entropy cod

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  • Code rate estimation method for video coding
  • Code rate estimation method for video coding
  • Code rate estimation method for video coding

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Embodiment Construction

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0065] For estimation, the first step should be to analyze the organizational format of the semantic elements. First consider the code rate generated by the coefficient block. In the HEVC standard, the quantized coefficients in a transform unit (TU) have the format of semantic elements when performing entropy coding: figure 1 shown. For an NxN TU, all coefficients are first divided into 4x4 sub-blocks. The 4x4 sub-blocks are processed sequentially according to the predefined scanning order. Within each sub-block, the 16 coefficients are scanned in a certain order. The scanning order may be horizontal, vertical or diagonal, which is determined by the prediction mode. Before encoding the first sub-block, encode SkipFlag and LastXY. The meaning of SkigFlag is whether the NxN...

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Abstract

The invention discloses a code rate estimation method for video coding. The code rate estimation method for video coding comprises S1, dividing a transform unit into a plurality of 4*4 coefficient subblocks and extracting feature parameters of the coefficient subblocks; S2, grouping the coefficient subblocks according to the feature parameters; S3, calculating the coding length Rcoeff generated by the coefficient subblocks according to grouping; S4, calculating an optimal coding total length Ropt of the coefficient subblocks according to the number of coefficients utilizing Golomb coding; S5, calculating a Golomb coding compensation value Rc according to the greatest coefficient utilizing the Golomb coding; S6, repeating S1-S5 and calculating the coding total length Rtotal of all the coefficient subblocks; S7, calculating LastXY coding lengh Rlastxy; S8, calculating the auxiliary information coding total length Rside; S9, calculating a code rate estimated value R of the transform unit according to the Rtotal, Rlastxy and the Rside.

Description

technical field [0001] The invention relates to the technical field of video processing, in particular to a method for estimating a code rate of video coding. Background technique [0002] The High Efficiency Video Coding (HEVC) standard adopts a flexible coding block division method, and divides the image to be compressed into different pixel units for different purposes, including coding units (Coding Unit, CU), transformation units (Transform Unit, TU) and prediction unit (Prediction Unit, PU). During the encoding process, the encoder must try all CU / PU / TU combinations to find the best encoding method, that is, the encoding method with the smallest rate-distortion cost (Rate-Distortion Cost, RD Cost). This process is called Rate-Distortion Optimization (RDO). RD Cost is an indicator used to evaluate coding efficiency after considering the two opposite things of coding rate and distortion at the same time. In the HEVC reference software HM, the code rate R is obtained b...

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Application Information

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IPC IPC(8): H04N19/13H04N19/146H04N19/169
Inventor 刘振宇郭三川汪东升
Owner TSINGHUA UNIV
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