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Research of Scalable Video Coding Based on H.264/AVC Extension

Author: LiXueSong
Tutor: ZhuGuangXi
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: The scalable video encoding Mode selection Inter-layer prediction Human visual system Detecting Regions of Interest FJND model
CLC: TN919.81
Type: Master's thesis
Year: 2011
Downloads: 19
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Abstract

With the development of the times, the way people communicate growing number of increasingly high requirements for communication, multimedia communication is increasingly more important to them. For multimedia communications, video communication has also been given high expectations. However, different terminals and different user requirements for the video is different. In the case of limited network resources, try to meet the needs of different users and terminals is also one of the focus. It is hoped that the video data only through coding to meet the needs of different users and different terminal, which provides the foundation to the development of scalable video coding. The basic theory is that in the case of limited network conditions, to ensure effective transmission, and enhance a part of the basic data layer of the data to be transmitted only in case of need and the network conditions allow. In October 2004, the scalable extension of the H.264/AVC encoding officially boarded the stage of history. In addition to the operation to complete H.264/AVC encoding process, as well as with its own distinctive layer forecast. Since the enhancement layer of the data from the base layer, so that they have a strong correlation, so the inter-layer prediction can effectively eliminate the inter-layer information redundancy. However, as we all know, the H.264/AVC standard algorithm is very complex. The introduction of inter-layer prediction in scalable extension standard, which allows a higher complexity of the standard. Therefore, the encoding speed is very slow, and can not be done timeliness. In the actual applications, very difficult to be applied. So the H.264/AVC scalable extension standard, the optimization is particularly important. The study showed that using a standard right video sequences encoding process, the mode selection process consumes a lot of time, has also received a lot of mode selection optimization algorithm, basically using the mode information corresponding to the base layer macroblock, the mode of an enhancement layer optimized to reduce the number of enhancement layer of candidate patterns. The proposed mode selection algorithm taking into account not only their corresponding base layer macroblock mode information, the experiments show, the adjacent macro block mode, the mode selected for the macro block of the enhancement layer is still affected, so this full account of these adjacent block information, and then the enhancement layer macroblock mode candidates screened. Reduce the number of candidate patterns, in order to achieve the optimal effect of mode selection. Except that the standard mode selection optimization, but also from another level of the scalable video encoding optimization, i.e. using the region of interest, selective for certain visual highlight portion of the image enhancement layer encoding . Before the enhancement layer encoding, it first determines if the threshold value set higher than the text FJND model, then a high degree of interest in the region before the enhancement layer encoding, and this can make the subjective quality of the encoded substantially constant, largely reduce the bit rate from the the visual subjectivity proceed to optimize the encoding process.

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