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