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Fast inter-frame prediction method applicable to high efficiency video coding (HEVC)

An inter-frame prediction and fast technology, applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve problems such as huge complexity, and achieve the effect of flexible control of coding complexity

Active Publication Date: 2014-09-03
HUAQIAO UNIVERSITY
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Problems solved by technology

[0008] It can be seen from the above that inter-frame prediction needs to exhaustively perform RDO calculations on CUs of 4 depth levels (depth range: 0-3) and all PU modes of each depth level in order to determine the optimal segmentation mode, which can be seen to be complicated. degree is quite huge

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  • Fast inter-frame prediction method applicable to high efficiency video coding (HEVC)

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[0038] A fast inter-frame prediction method applicable to HEVC, comprising the steps of:

[0039] Step 1: Preprocessing statistics stage, specifically including:

[0040] Step a1: Count the thresholds of the RDcost-based CU segmentation early termination method. The three sets of thresholds that vary with QP (Quantization Parameter) at each depth level 0-2 are as follows:

[0041] Thr 64 =2270×e 0.8907×QP (1)

[0042] Thr 32 =722.2×e 0.1096×QP (2)

[0043] Thr 16 =228.5×e 0.1136×QP (3)

[0044] Step a2: Statistics such as figure 2 The relationship between the MV length information of the current CU and the MV length information of all coded units adjacent to it in time and space and each PU mode is shown, and the maximum MV length L in the group of MV sets is obtained by formula (4) (5), and the statistics The threshold of L is as follows: QP with L=0 is 22, QP with L=2 is 27, QP with L=4 is 32, QP with L=6 is 37;

[0045] l(mv i )=|x i |+|y i |,i=1,2,3,4,...

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Abstract

The invention provides a fast inter-frame prediction method applicable to high efficiency video coding (HEVC). The method comprises the following steps: firstly, determining 2N*2N (N=32, 16, 8 and 4) division in advance by using an MV (Motion Vector) length obtained by a current CU (Coding Unit) and all nearest coded modules in time space on the PU (Prediction Unit)-stage mode decision, and then terminating further division calculation of the CU meeting the condition by using the RDcost on the CU stage. By adopting the method disclosed by the invention, unnecessary depth calculation of the CU and the unnecessary mode calculation of the PU can be accurately terminated, the inter-frame coding complexity of the HEVC can be greatly reduced, and real-time application of an HEVC coder is achieved.

Description

【Technical field】 [0001] The invention belongs to the field of video information processing in the field of digital video communication, and in particular relates to a HEVC (High Efficiency Video Coding, high-efficiency video coding) fast inter-frame prediction method based on rate-distortion cost and motion vector length. 【Background technique】 [0002] With the continuous advancement of technology, people have higher and higher requirements for visual and audio quality, and high-definition video and ultra-high-definition video have begun to receive widespread attention. The second-generation video coding standard H.264 / AVC created 10 years ago can no longer meet people's requirements for practical applications. The industry and academic circles are increasingly eager for a new generation of video coding standards. In this situation, the two major standards organizations, VCEG and MPEG, began to cooperate in the development. In January 2010, a joint organization called JCT-...

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Application Information

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IPC IPC(8): H04N19/147H04N19/109
Inventor 林其伟许东旭董晓慧
Owner HUAQIAO UNIVERSITY
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