A Novel Approach of IntraPrediction Mode Selection in H264在H.264帧内预测模式选择的新方法.pptVIP

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A Novel Approach of IntraPrediction Mode Selection in H264在H.264帧内预测模式选择的新方法.ppt

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A Novel Approach of IntraPrediction Mode Selection in H264在H.264帧内预测模式选择的新方法

A Novel Approach of Intra-Prediction Mode Selection for 4x4 in H.264(First_Edition) 2004.07.07 Summer Vacation Seminar Myoung-Seo Kim Contents AVC Encoder overview Introduction Features Luminance Macroblock in a QCIF Frame 4x4 Intra prediction Example of profiling Signaling I-Prediction Mode Conclusion References AVC Encoder Overview Introduction In the upcoming H.264, intra-prediction for each 4x4 block is used to compress I-frame However, the full search algorithm to choose one of the 9 prediction modes is computationally expensive A novel approach of mode selection Mode selection method based on partial computation of the cost function ( Cost16 = SAD16 + 2Rλ(QP) ), early termination and selective computation of highly probable mode Using the selective search algorithm of each prediction mode Features The basic image block unit H.264: 4x4 size MPEG-1/2/4 and H.261/3: 8x8 size Some advance features of H.264 4x4 integer DCT Intra-prediction in I-frame coding Quarter-pixel motion compensation Multiple reference frame and multiple block size for P-frame coding Luminance Macroblock in a QCIF Frame 4x4 Intra Prediction (1-2) 4x4 Intra Prediction (2-2) A prediction mode is a way to generate 16 predictive pixel values (named a to p) using some or all of the neighboring pixels A to Q Mode 0: Vertical prediction mode in which pixels a, e, i and m are predicted by A Mode 1: Horizontal prediction mode in which pixels a, b, c and d are predicted by I Mode 2: DC prediction in which all pixels (a to p) are predicted by (A+B+C+D+I+J+K+L)/8 The other modes are similar except that the directions are different Example of profiling Signaling I-Prediction Mode (1-4) The choice of intra prediction mode for each 4x4 block must be signaled to the decoder and this could potentially require a large number of bits To encode the prediction mode for each 4x4 block efficiently, the correlation between spatially adjacent blocks is exploited probability list! Si