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Dominant edge direction based fast intra mode decision in the H.264/AVC encoder

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 767-777页

作者： Byeongdu LA Minyoung EOM Yoonsik CHOE Department of Electrical and Electronic Engineering Yonsei University

The H.264/AVC video coding standard uses an intra prediction mode with 4×4 and 16×16 blocks for luma and 8×8 blocks for chroma. This standard uses the rate distortion optimization (RDO) method to determine the best coding mode based on the compression performance and video quality. This method offers a large improvement in coding efficiency compared to other compression standards, but the computational complexity is greater due to the various intra prediction modes. This paper proposes a fast intra mode decision algorithm for real-time encoding of H.264/AVC based on the dominant edge direction (DED). The DED is extracted using pixel value summation and subtraction in the horizontal and vertical directions. By using the DED, three modes instead of nine are chosen for RDO calculation to decide on the best mode in the 4×4 luma block. For the 16×16 luma and the 8×8 chroma, only two modes are chosen instead of four. Experimental results show that the entire encoding time saving of the proposed algorithm is about 67% compared to the full intra search method with negligible loss of quality.

关键词： H 264 Intra prediction mode decision Dominant edge direction

H.264/SVC mode decision Based on mode Correlation and Desired mode List

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International Journal of Automation and computing 2014年第5期11卷 510-516页

作者： L.Balaji K.K.Thyagharajan Faculty of Information and Communication Anna University RMD Engineering College

Design of video encoders involves implementation of fast mode decision(FMD) algorithm to reduce computation complexity while maintaining the performance of the coding. Although H.264/scalable video coding(SVC) achieves high scalability and coding efficiency, it also has high complexity in implementing its exhaustive computation. In this paper, a novel algorithm is proposed to reduce the redundant candidate modes by making use of the correlation among layers. A desired mode list is created based on the probability to be the best mode for each block in base layer and a candidate mode selection in the enhancement layer by the correlations of modes among reference frame and current frame. Our algorithm is implemented in joint scalable video model(JSVM)9.19.15 reference software and the performance is evaluated based on the average encoding time, peak signal to noise ration(PSNR)and bit rate. The experimental results show 41.89% improvement in encoding time with minimal loss of 0.02 dB in PSNR and 0.05%increase in bit rate.

关键词： H.264 scalable video coding mode decision mode correlation rate distortion cost

Fast feature-based mode decision for 4×4 intra prediction in H.264/AVC

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Science China(Information Sciences) 2011年第11期54卷 2386-2399页

作者： WANG Ping,HUANG Hua & TAN ZhengSchool of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China 1. School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049 China

Intra coding in H.264/AVC can significantly improve the compression efficiency at the cost of high computational complexity due to the use of the rate-distortion optimization *** reduce the complexity of intra prediction,we propose a feature-based mode decision algorithm for 4×4 intra *** algorithm is motivated by the fact that a good prediction mode usually has a small residue block,which is the difference between the original block and predicted *** sum of the absolute transformed coefficients and deviation information of residue block are used to measure the distortion of prediction mode and the smoothness of residue block,*** to the ranking of these two features of all possible modes,and together with the most probable mode,small numbers of candidate modes can be ***,the candidate modes are further reduced to only one by using two early termination rules based on the correlation of rank and most probable *** results demonstrate that the proposed mode decision method reduces about 60% of total encoding time of intra coding with negligible loss of coding performance.

关键词： intra prediction mode decision H.264/AVC RDO

Adaptive early termination of fast mode decision in MVC based on inter-view correlation

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Journal of Shanghai University(English Edition) 2011年第4期15卷 321-324页

作者：沈礼权张兆杨杨高波 Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education College of Communication Engineering Hunan University

Variable size motion estimation （ME） and disparity estimation （DE） are employed to select the best coding mode for each macroblock （MB） in the current joint multiview video model （JMVM）. This technique achieves the highest possible coding efficiency, but it results in extremely large computation complexity which obstructs the multiview video coding （MVC） from practical application. This paper proposes an adaptive early termination of fast mode decision algorithm for MVC. It makes use of the coding information of the corresponding MBs in neighbor view based on inter-view correlation to early terminate the mode decision procedure. Experimental results show that the proposed fast mode decision algorithm can achieve computational 50% computation saving with no significant loss of rate distortion （RD） performance.

关键词： multiview coding mode decision motion estimation (ME) disparity estimation (DE)

Fast inter-mode decision method based on best matching block for H.264 encoding

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Journal of Shanghai University(English Edition) 2007年第3期11卷 286-289页

作者：王淑慧林涛林争辉 Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200030 P. R. China

In H.264 encoder, all possible coding modes should be checked to choose the most appropriate mode for every macroblock, which adds a heavy computation burden to the encoder. In this paper, a fast inter-mode decision method is presented to reduce computation complexity of an H.264 encoder. By detecting the best matching block （BMB） before transform and quantization, some coding modes can be skipped and the corresponding encoding steps can be omitted for these BMBs. Meanwhile this method can also be used to detect all-zero blocks. The experimental results show that this method achieves consistently significant reduction of encoding time while keeping almost the same rate-distortion performance.

关键词： mode decision best matching block (BMB) all-zero block

A Novel Fast Inter mode decision for H.264

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A Novel Fast Inter Mode Decision for H.264

Efficient video downscaling transcoder from MPEG-2 to H.264

2006 8th International Conference on Signal Processing

作者： Jialue Fan Yu Chen Xudong Zhang Department of Electronic Engineering Tsinghua University

＜正＞Selecting an efficient inter block mode in H.264 standard should now be *** on the ratio of cost to improve inter mode decision in H.264 encoder this paper proposes a novel *** using different parameters the proposed algorithm is flexible for various video quality *** results show that the proposed method can reduce H.264 encoder complexity effectively without significant loss of video quality.

关键词： H.264 mode decision

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 457-463页

作者： Xiang-wen WANG Jun SUN Rong XIE Song-yu YU Shanghai Key Lab. of Digital Media Processing ＆ Transmissions Institute of lmage Communication ＆ Information Processing Shanghai Jiao Tong University Shanghai 200240 China

The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those streams into H.264 in these applications. Unfortunately, the huge complexity keeps transcoding from being widely used in practical applications. This paper proposes an efficient transcoding architecture with a smart downscaling decoder and a fast mode decision algorithm. Using the proposed architecture, huge buffering memory space is saved and the transcoding complexity is reduced. Performance of the proposed fast mode decision algorithm is validated by experiments.

关键词： Video transcoding mode decision Edge direction analysis

Fast Inter Coding mode Selection Algorithm for H.264

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Chinese Journal of Aeronautics 2006年第3期19卷 219-224页

作者：董海燕张其善 School of Electronic Information and Engineering Beijing University of Aeronautics and Astro- nautics Beijing 100083 China

In order to reduce the encoding complexity of macroblock coding mode decision in H.264/AVC, a selective smaller block-size searching algorithm and a selective intra coding mode searching algorithm are proposed by using the high correlation among coding modes and in spatial and temporal domains of video sequence. Simulation results demonstrate that the proposed algorithm can provide significant improvement in computational requirement, with negligible small picture quality degradation and slight bit rate increase.

关键词： H.264 video coding motion estimation inter flame coding intra frame coding mode decision rate distortion