An efficient scheme of IDCT optimization in H.264 decoding
Guoxing Bao · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2011
This paper proposes an efficient scheme of IDCT in H.264 decoder. Firstly, motion compensation residuals of macro-block get from the bit-stream are classified into four cases: only dc coefficient is non-zero, only first row coefficients are non-zero, only first column coefficients are non-zero and others, and it is obvious that inverse transform processing of previous cases can be optimized, so in the second, we use different processing of IDCT in different cases to reduce their complexity. Compared with traditional IDCT scheme, the proposed scheme achieves an average 51.8% reduction in computation complexity without degradation in visual quality.