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Proposed is a scaled zero coefficient-aware fast inverse discrete cosine transform (IDCT) algorithm that substantially outperforms the existing fixed-point 8×8 IDCT standard. The concept of the fixed-point approximation with accurate dyadic terms is applied to the zero coefficient-aware IDCT algorithm, improving the computational complexity of the authors× previous work. The experimental results show that the running time of the proposed scaled zero coefficient-ware algorithm is faster than that of the fixed-point 8×8 IDCT standard by a speed-up factor of 2.0 times on average and up to 2.6 times for the HD sequences.
Date of Publication: December 9 2010