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Title |
Fast Mode Decision Algorithm for Intra prediction in H.264/AVC Video Coding |
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Author |
Abderrahmane Elyousfi, Ahmed Tamtaoui, EL Houssine Bouyakhf |
| Citation |
Vol. 7 No. 1 pp. 356-364 |
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Abstract |
The new video coding standard, H.264/MPEG-4 AV C, uses an intra prediction mode with 4x4 blocks and 16x16 blocks sizes for luma component and 8x8 blocks size for chroma component. This new feature of H.264/AVC offers a considerably higher improvement in coding efficiency compared to other compression standards. In order to achieve this, a robust Rate-distortion optimization (RDO) technique is employed to select the best coding mode for each block sizes. However, the computational complexity of H.264 encoder is drastically increased due to the various intra prediction modes. In this paper, we propose a fast mode decision algorithm for intra prediction to reduce the complexity of H.264 video coding. The proposed algorithm based the fact that the dominating direction of a smaller block is similar to that of bigger block, the directional correlation of each block is consistent with directions of the edges, and the prediction modes of each block are also correlated with those of neighboring modes. The experimental results show that the fast intra mode decision algorithm is able to reduce on the average 84.68% encoding time, with a negligible peak signal-to noise ratio loss of 0.19dB or, equivalently, a bit rate increment of 1.88%. |
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Keywords |
Intra prediction, H.264/AVC, video, coding, encoder complexity |
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