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Title: From hybrid video coding to advances in video transcoding
Authors: Siu, WC 
Issue Date: 2005
Source: Proceedings of the 2005 IEEE International Workshop on VLSI Design and Video Technology, IWVDVT 2005, 2005, p. 13- (Keynote Presentation) How to cite?
Abstract: Very often a video server may have to provide quality support services to heterogeneous clients or transmission channels with different speeds, or a hand-held device may have to receive videos form sources with various standards, frame rates or sizes. It is these reasons that transcoding is an important topic for modern video technology, which is regarded as a process of converting a previously compressed video bitstream into a new syntax without the need for full decoding or re-encoding operations. One obvious approach for implementing transcoding is to decode the incoming bit-stream in the pixel domain and then re-encode it at the desired output bitrate according to the capability of receiving devices and the available bandwidth of the network. This involves a high processing complexity. A better approach is to do all these operations in the transform domain, such that a complete decoding and re-encoding process is not required. However, how far can these be done? Would the quality become better using the DCT domain? Is there any general formulation for converting a B-picture into a P-picture? How does this related to the recent advanced video coding standard: the H.264 technologies? In this presentation, we start with a short review on the hybrid video coding, and some highlights of its techniques and its relationship with the object oriented video coding and the recent optimized high quality and low bit rate coding. We then will try to relate the hybrid video coding to video transcoding, and to answer some of the above questions. Our approaches on video transcoding using direct addition, split and merge techniques are discussed. A number of illustrations and demonstrations will be given to show the basic principles, new research results, and our recent studies on the conversion between the DCT and integer transform, say for example. The presentation will end with some ideas on new trends and directions in the area.
Description: 2005 IEEE International Workshop on VLSI Design and Video Technology, IWVDVT 2005, Suzhou, 28-30 May 2005
ISBN: 0780390067
Appears in Collections:Conference Paper

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