H.264/AVC frame inner prediction method based on edge characteristics

An intra-frame prediction and edge feature technology, applied in the field of intra-frame prediction, H.264/AVC intra-frame prediction based on edge features, can solve the problems of high encoder complexity and difficulty in real-time encoding, and reduce algorithm complexity degree, good practical value and application prospect, and the effect of improving the encoding speed

Inactive Publication Date: 2009-07-29
BEIHANG UNIV
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Problems solved by technology

This makes the encoder complex and difficult to achieve real-time encoding

Method used

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  • H.264/AVC frame inner prediction method based on edge characteristics
  • H.264/AVC frame inner prediction method based on edge characteristics
  • H.264/AVC frame inner prediction method based on edge characteristics

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Embodiment Construction

[0038] See figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 Shown, a kind of H.264 / AVC intra prediction method based on edge feature, the specific implementation steps of this method are as follows:

[0039] Using H.264 / AVC reference software JM8.6 as the platform to carry out simulation experiments. The experimental test conditions meet the Baseline Profile requirements of H.264, the coding sequence is III, using Hadamard transform and rate-distortion optimization; for QCIF (4:2:0) and CIF (4:2:0) sequences, the coding length is 100 frames, the frame rate is 30f / s.

[0040] (1) In intra prediction, the predicted block P is formed based on the coded reconstructed block and the current block. For luma pixels, P blocks are used for correlation operations of 4×4 sub-blocks or 16×16 macroblocks; for chrominance pixels, P blocks are used for correlation operations of 8×8 macroblocks. figure 1 It is a schematic diagram of adjacent position pixels and prediction direct...

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Abstract

The invention discloses an H.264/AVC intra-prediction method based on edge characteristics, which includes: performing data block prejudging before intra-prediction based on principal edge intensity (DES) and the like edge direction characteristics calculated by the edge histogram description describing the image marginal distribution, selecting the mode subclass corresponding to the characteristics to perform RDO calculation, thereby reducing the mode selection number of the intra-prediction; at the same time directly determining the Intra_8*8 chrominance prediction mode from the Intra_16*16 brightness prediction mode according to the correlativity of the chrominance prediction mode and the brightness prediction mode, to further reduce the complexity of the algorithm. The method has six steps, and is convenient and facilitating. Practice shows that the method can obviously improve the encoding speed, and can ensure that the bit-rate encoding (an increase of 3%) and peak signal-noise ratio (reduced about 0.02dB) have little change compared with the full search method. The method has very good practical value and application prospects.

Description

(1) Technical field [0001] The present invention relates to an intra-frame prediction method, in particular to an edge feature-based H.264 / AVC intra-frame prediction method, which reduces the number of prediction modes to be processed by pre-judging data blocks before making predictions. The invention belongs to the technical field of video compression coding. (2) Background technology [0002] The H.264 / AVC standard is jointly developed by the Video Coding Experts Group (VCEG) of the International Telecommunication Union (ITU-T) and the Moving Picture Experts Group (MPEG) of the International Organization for Standardization (ISO / lEC). The video coding standard developed by the formed Joint Video Team (JVT), also known as the MPEG-4 Part 10 standard and the ITU-T H.264 recommendation. H.264 / AVC adopts a series of advanced technologies to achieve excellent compression performance. Under the same reconstruction image quality, it can save about 50% bit rate compared with H.26...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N19/50
Inventor 王翔翟昌英
Owner BEIHANG UNIV
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