Complexity Reduction of IDCT by using CBP and Adaptive Pruning in H.264/AVC Decoder

Luong Pham Van and Byeungwoo Jeon


Decoder complexity, H.264/AVC, inverse transform, CBP


In this paper, we propose two methods to reduce computational complexity of H.264/AVC decoder. The proposed methods utilize CBP (Coded Block Pattern) information to skip inverse DCT transform and reconstruction processes for 8x8 blocks that have CBP bits being zero. Furthermore, we adaptively skip zero coefficients in a block to reduce unnecessary computation in inverse DCT transform module. Experimental results show that the proposed method can reduce decoding complexity by about 10 % with only a negligible PSNR drop.

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