H.264에서 부호화 효율 및 속도개선 방법에 관한 연구

On the F ast H.264 encoding considering coding efficiency

For the improvement of coding efficiency, the new coding tools compared with existing coding standards, the complexity of H.264/AVC standard encoder is greatly increased. Specifically, the inter/intra mode decision method using RDCKrate—distortion optimization) technique is one of the most complex parts in H.264/AVC. In this paper, we focus on the complexity reduction in macroblock mode decision. In the proposed method, we reduce the complexity of the Intra4x4 mode decision process using 4x4 simple square filters, and using spatial block correlation method. Additionally, exploiting the best mode of sub_macroblock in Inter8x8 mode, we proposed an algorithm to eliminate some intra modes in current macroblock mode decision process. In addition, we employed a method to raise the probability to select SKIP, Interl6xl6, and Intral6xl6 modes which usually show low complexity and low bitrate compared with other modes. From the simulation results, the proposed algorithm reduce the encoding time by maximum 83% of total, and reduce the bitrate of the overall sequences by 8 〜 10% on the average compared with existing coding methods.