Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/16242
Title: Advanaced video coding for reducing complexity in H.264
Authors: WU DAJUN
Keywords: H.264, RDO, mode decision, Intra mode, Inter mode, interpolation
Issue Date: 1-Jun-2007
Source: WU DAJUN (2007-06-01). Advanaced video coding for reducing complexity in H.264. ScholarBank@NUS Repository.
Abstract: The main aim of this thesis is to develop fast algorithms that can improve the encoding speed of H.264 without significant loss of visual quality. A fast mode decision algorithm is firstly presented for intra prediction in H.264 video coding. By making use of the edge direction histogram, this algorithm significantly reduces the number of mode combinations for luminance and chrominance blocks in a macroblock in the rate-distortion-optimization (RDO) calculation. Secondly, a fast inter mode decision algorithm is proposed to decide the best mode in the inter coding of H.264. It reduces encoder complexity by using the spatial homogeneity and the temporal stationarity characteristics of the textures of video objects. Thirdly, two fast intra 4x4 mode elimination methods are proposed for H.264 coding. The lossless method checks the cost after each 4x4 block intra mode decision, and terminates if the cost is higher than the minimum cost for inter mode coding. On the other hand, by using some low cost preprocessing to make prediction, the lossy approach terminates if the cost is higher than some fraction of this minimum cost. Finally, this thesis presents two adaptive interpolation methods that can significantly reduce the interpolation operation in H.264 coding. By making use of the flag matrix data structure and using interpolation on-demand, the methods are able to increase the encoder speed without any PSNR loss or increase in bit rate.
URI: http://scholarbank.nus.edu.sg/handle/10635/16242
Appears in Collections:Ph.D Theses (Open)

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