Inter-frame prediction mode selection method based on pre-coding and coding SATD value weighting

An inter-frame prediction mode and pre-coding technology, applied in the field of video coding and decoding

Active Publication Date: 2019-08-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultra-high-definition video with a resolution of up to 8K×4K is also gradually appearing in daily appl

Method used

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  • Inter-frame prediction mode selection method based on pre-coding and coding SATD value weighting
  • Inter-frame prediction mode selection method based on pre-coding and coding SATD value weighting

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Experimental program
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Embodiment 1

[0109] A weighted inter-frame prediction mode selection method based on precoding and coding SATD values, the steps include:

[0110] (1) Obtain the flag bit sub_flag value of the current CU depth layer d;

[0111] (2) Judging whether the CUs are all inside the image: if so, proceed to step (3); if not, directly enter the division of the next depth layer d+1; that is, the current CU is divided into 4 subtrees downward CU;

[0112] (3) Determine whether to select Merge mode or Skip mode: if yes, calculate the RDcost of Merge mode and Skip mode in inter-frame prediction, and select the mode with the smaller RDcost as the temporary best mode; if not, skip Through the selection of Merge mode and Skip mode by the current depth, directly proceed to step (4);

[0113] (4) Determine whether to divide the depth of the next CU: if so, divide the CU into a quadtree of the next depth d+1; if not, directly proceed to step (5);

[0114] (5) judge whether to carry out the judgment of its ...

Embodiment 2

[0126] This example describes the technical solution of the present invention in detail based on an HEVC encoder. Among them, the subjective quality index adopts the structural similarity index (SSIM for short). For the mode selection of inter-frame prediction, it uses CTU as the basic unit for inter-frame mode selection, that is, from the largest CU with a depth of 0 That is, the CTU (64×64) starts to be calculated, and one of the CTUs in the P frame is used for specific explanation. Specific steps are as follows:

[0127] 1) Find the CU_64 whose depth is 0, that is, the mode selection of the CU whose size is 64×64:

[0128] a. Obtain the flag sub_flag of the SATD value whose current depth is 0:

[0129] sub_flag = 1;

[0130] b. Judging whether the current CU_64 is inside the image. The main criteria for judgment are:

[0131] (numPartitions>=16||!bMVType). Among them, numPartitions is the 4×4 block of the current CU, bMVType is whether to re-reference the MV,

[0132...

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Abstract

The invention provides an inter-frame prediction mode selection method based on pre-coding and coding SATD value weighting, and belongs to the technical field of video coding and decoding. The methodis applied to a video compression coding process, and aiming at the problems of distortion and high calculation complexity caused by mode selection of inter-frame prediction coding, the invention provides a rapid mode selection method in inter-frame prediction. According to the present invention, the pre-coded SATD value and the coded SATD value are weighted, the weighted value is applied to eachmode selection in inter-frame prediction, so that on the condition of guaranteeing the subjective quality of the videos, the computational complexity of the encoder is reduced, the encoding time is shortened, and the encoding efficiency is improved. The method is simple and feasible, and facilitates the industrialized popularization of a new generation of video encoding standard.

Description

technical field [0001] The invention belongs to the technical field of video encoding and decoding, and in particular relates to an inter-frame prediction mode selection method based on pre-encoding and encoding SATD value weighting. Background technique [0002] Video coding refers to the conversion of video signal files into another file format through some compression means, so that in the process of signal transmission, the use of bandwidth is reduced and its transmission is efficient. High Efficiency Video Coding (HEVC for short) is a new video compression standard developed by the Joint Video Collaborative Team (JCT-VC) established by MPEG and VCEG in 2012. HEVC is superior to H.264 in terms of performance, and its compression rate can reach twice that of H.264 under the same video quality. After movies, cartoons and other videos are compressed by HEVC video, not only the traffic consumption of mobile phone users watching online videos will be greatly reduced, but als...

Claims

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Application Information

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IPC IPC(8): H04N19/109H04N19/176H04N19/96
CPCH04N19/109H04N19/96H04N19/176
Inventor 张昊向广
Owner CENT SOUTH UNIV
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