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Advances in Multimedia
Volume 2014, Article ID 621680, 8 pages
Research Article

An Improved Fast Mode Decision Method for H.264/AVC Intracoding

Computer Science Department, National Engineering School of Applied Sciences, University Ibn Zohr, 80000 Agadir, Morocco

Received 9 January 2014; Accepted 22 April 2014; Published 20 May 2014

Academic Editor: Constantine Kotropoulos

Copyright © 2014 Abderrahmane Elyousfi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An improved fast and efficient mode decision method for H.264/AVC intracoding is proposed, which is based on the analysis of the gravity center method and more efficient mode selection. In contrast to the fast mode decision method where the intramodes are determined by the gravity center of the block, the mass center vector is computed for the block and the subblocks formed by the proposed subsampling techniques. This method is able to determine all correlation directions of the block that correspond to the intraprediction mode directions of the H.264/AVC. On this basis, only a small number of intraprediction modes are chosen as the best modes for rate-distortion optimization (RDO) calculation. Different video sequences are used to test the performance of the proposed method. Experimental results reveal the significant computational savings achieved with slight peak signal-to-noise ratio (PSNR) degradation and bit-rate increase.