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The paper optimizes AVS key coding algorithm, and designs high coding efficiency and high coding quality AVS encoder XAVS based on x86 platform. It supports IPPP, IBBP structure, films on a variety of formats of media sources to AVS compression, rate control, rate distortion optimization, and packaged into the standard TS stream. The experiment results show that subjective quality of XAVS is better...
Due to the high performance in the rate control of MPEG-4, the quadratic Rate-Distortion model has been widely proved. The rate control module in the reference software of H.264/AVC directly inherits the quadratic model. However, the introduction of Rate Distortion Optimization (RDO) in H.264/AVC makes rate control more complex than previous standards. Based on theoretical derivation and extensive...
H.264 adopts variable block size motion estimation and rate-distortion-optimization based mode decision to improve video quality and compression ratio. These techniques have made H.264 better than other existing video coding standards. However, they are computationally intensive and time-consuming. In this paper, a fast mode selection scheme is proposed for H.264 inter prediction. Firstly, the first...
The rate-distortion optimization framework employed in H.264 for the selection of best coding mode is computationally expensive, although it achieves remarkable coding efficiency. In this paper, an integrated intra prediction algorithm for intra-frame coding of the H.264 high profile is proposed. It consists of two components: a variance-based method for macroblock mode decision and an improved filter-based...
This paper describes in detail the various low level optimization techniques for implementing the H.264/AVC video encoding on the TI TMS320DM642 DSP platform. Optimization speedup performance of 5.25 times faster is achieved. A complete AVC encoding and RTSP streaming server system is also developed on the same platform, which is capable of serving live 4CIF video streaming at 25 fps with approximately...
This paper presents a study on video plus depth compression using available MPEG standards and its optimization for mobile 3D services. Video plus depth enables 3D television, but as mobile services are subject to various limitations, including bandwidth, memory, and processing power, efficient compression as well as low complexity view synthesis is required. Two MPEG coding standards are applicable...
The H.264 video coding standard has achieved a significant improvement in coding efficiency over previous standards. However, the computational complexity of the H.264 encoder is increased drastically, which results practical difficulties in its implementation on the embedded platform. This paper presents two implementation techniques to optimize the H.264 encoder on the embedded symmetric multiprocessor...
Based on the statistical analysis of relation between CBP (Coded Block Pattern), MVD (Motion Vector Difference) and each coding mode, a fast mode selection algorithm based on macroblock-adaptive is proposed. In this algorithm, adaptive judgment strategies are adopted to filter partial coding mode quickly. The residual CBP, MVD information is used adequately to identify the relativity of intra and...
As a new generation of video frequency coding standard, H.264/AVC is excellent in compression performance, while its complexity is much higher than common encoder. Based on the detailed analysis of CAVLC algorithm, this paper first points out the ldquobottleneckrdquo of CAVLC encoder implementation, then presents the optimization scheme for the major modules of CAVLC encoder, which includes VLC table...
The H.264/AVC standard achieves higher coding efficiency than the previous video coding standards with the rate-distortion optimization (RDO) technique which selects the best coding mode and the reference frame for each macroblock (MB). As a result, the complexity and computational load have been significantly increased. In this paper, a novel fast intra-mode decision algorithm is proposed to reduce...
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