| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === In this thesis, a fast mode decision algorithm is proposed to increase the coding efficiency for H.264/AVC intra prediction. Based on the inherent feature of Discrete Cosine Transform (DCT), the results of the transformed input blocks are analyzed to determine the direction of the edges. Only a few of prediction modes are chosen for cost calculation. Moreover, the coding performance is improved by the benefits of sum of absolute integer-transform differences (SAITD). A novel intra coding structure is also proposed based on the SAITD methodology and proposed mode decision algorithm. In comparison with the previous fast algorithms, the proposed method is integrated into the intra coding procedure rather than performed as a pre-processor. Experimental results reveal the proposed algorithm approximately reduces the encoding time by 60% with negligible PSNR degradation and slight bit-rate increment. The proposed intra coding system, which consist of intra prediction, mode decision, and reconstruction loop, easily supports the real-time requirement for resolutions up to the 1080 HD format by operating at 100Hz.
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