By Wen Gao, Siwei Ma
This ebook offers an outline of the cutting-edge in video coding expertise. in particular, it introduces the instruments of the AVS2 usual, describing how AVS2 may help to accomplish an important development in coding potency for destiny video networks and functions through incorporating smarter coding instruments akin to scene video coding. positive aspects: introduces the fundamental strategies in video coding, and offers a quick background of video coding know-how and criteria; studies the coding framework, major coding instruments, and syntax constitution of AVS2; describes the main applied sciences utilized in the AVS2 normal, together with prediction coding, rework coding, entropy coding, and loop-filters; examines effective instruments for scene video coding and surveillance video, and the main points of a promising clever video coding method; discusses optimization applied sciences in video coding structures; offers a assessment of photograph, video, and 3D content material caliber overview algorithms; surveys the recent study subject matters in video compression.
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Extra info for Advanced Video Coding Systems
Fig. 9 Development of coding tools 28 2 Video Coding Basic Principle The differential signal is also called residual signal and at the receiver side the original signal can be reconstructed by adding the residual and the prediction. Compared to the original signal, the residual signal has lower correlation. Prediction coding is an efficient tool to reduce the spatial, temporal, and set redundancy existing within or among the video signal(s), and many prediction coding tools have been proposed. The earliest using of prediction coding is pixel-based DPCM (differential pulse coding modulation) coding, where the difference between neighboring two pixels are quantized and transmitted (Cutler 1950).
1 Sequence and Picture Sequence is the highest syntax structure of the coded bitstream,which is composed of consecutive coded pictures. It starts with a sequence header, followed by one or more coded pictures. The initial sequence header can be allowed to appear repeatedly in the bitstream—which is called repeated sequence header, and makes random access into the potential sequence. In the sequence, each coded picture starts with a picture header, and is ordered accordingly in the bitstream. The order of these pictures in the bitstream is the same 46 3 An Overview of AVS2 Standard as one in decoding, but it can be different from display order, which is related with the picture coding type.
At its maximum, 16 different filter sets can be assigned for the luminance component and only one for the chrominance components. The second stage is a filter decision, which includes both the frame level and LCU level. Firstly the encoder decides whether frame-level adaptive loop filtering is performed. If frame level ALF is on, then the encoder further decides whether the LCU level ALF is performed. , are characterized by temporally stable background. The redundancy originating from the background could be further reduced.