| Summary: | 碩士 === 國立中正大學 === 資訊工程研究所 === 99 === A two level mode decision with edge information for H.264 high profile encoder is proposed in this thesis. H.264 is a latest international video coding standard. In high profile, H.264 supports three intra modes: intra 4x4, intra8x8, and intra 16x16. For intra 4x4 and intra 8x8, there are nine possible prediction modes. For intra 16x16, there are four possible prediction modes. Totally, there are twenty two modes to process. The computational complexity is extremely high. This thesis proposes a two level mode decision to reduce the computational complexity. In level one mode decision, the edge information is used to decide the appropriate intra coding block size. A smooth macroblock usually chooses the large intra coding block size while a complex macroblock usually chooses the small one. In level two mode decision, we use the correlation between adjacent blocks to decide the appropriate prediction modes. The proposed method achieves 29%~59% reductions in computational complexity when compared to JM14 and the PSNR only drops 0.09 db in average.
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