A Novel Aproach of IntraPrediction Mode Selection for 4x4 in …四轮驱动的一种新的帧内预测模式的选择方法….pptVIP

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A Novel Aproach of IntraPrediction Mode Selection for 4x4 in …四轮驱动的一种新的帧内预测模式的选择方法….ppt

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A Novel Aproach of IntraPrediction Mode Selection for 4x4 in …四轮驱动的一种新的帧内预测模式的选择方法…

A Novel Approach of Intra-Prediction Mode Selection for 4x4 in H.264(Second_Edition) 2004.07.14 Summer Vacation Seminar Myoung-Seo Kim Contents Observations Conventional algorithm Profiling 4x4 luma prediction mode 8 modes direction similarity Proposed algorithm Conclusion Future work Observations The residue values of the intra-prediction are usually large compared with inter-prediction using motion estimation The optimal mode and other good modes are most likely in similar direction The direction features of the 4x4 blocks can be preserved roughly after down-sampling Conventional Algorithm In the reference software JM from JVT Generate a 4x4 predicted block according to a mode Calculate sum of absolute (SAD16) between the original 4x4 block and the predicted block Compute Cost16 = SAD16 + 2R λ(Qp) Where λ(Qp) is an approximately exponential function of the quantization factor Qp, R is the position of the present mode in the probability list Repeat 1 to 3 for all the 9 modes, and choose the one that has the minimum cost Profiling 4x4 Luma Prediction Mode 8 Modes Direction Similarity Proposed Algorithm (1-4) Instead of checking all 16 pixels in a 4x4 block at one time, it organized the 16 pixels into 2 groups Mode 0, 1, 2 Group (1): Pixels a, c, i, k Group (2): Pixels f, h, n, p Mode 3, 7 Group (1): Pixels b, e, l, o Group (2): Pixels d, g, j, m Proposed Algorithm (2-4) Mode 4, 5, 6 Group (1): Pixels c, h, i, n Group (2): Pixels a, f, k, p The cost for one group Cost2 = SAD2 + Rλ(Qp) Each group is a “down-sampled” version of the original block Proposed Algorithm (3-4) If the first block gives, take the full search of the 9 modes T(threshold) = average of SAE, except for the highest SAE Choose the 6 modes with minimum SAE If the block is at the top or left of the frame, check 2 modes DC and Horizontal modes for the top block DC and Vertical modes for the left block Choose the mode with minimum cost, and stop If not, the other modes need to be examined N