The latest video coding standards, including Moving Picture Experts Group-4 (MPEG-4) advanced video coding (AVC)/H.264 and high-efficiency video coding (HEVC), use a discrete cosine transform (dct) process as the core...
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The latest video coding standards, including Moving Picture Experts Group-4 (MPEG-4) advanced video coding (AVC)/H.264 and high-efficiency video coding (HEVC), use a discrete cosine transform (dct) process as the core for compression efficiency, sacrificing the computational complexity at decoder. There have been a number of attempts to reduce the complexity of inversedct (Idct). Butterfly-based factorisation remains the most commonly used method for such a reduction. In this study, the authors propose a zero (Z) coefficient-aware fast butterfly-based Idctalgorithm for video decoding. They focus on a reduction in the computational complexity of the butterfly-based 8 x 8 Idct by removing the unnecessary computations of one-dimensional (1D) Idct kernels, and adaptively applying Idct kernels based on the number of non-Z dct coefficients to speed-up 1D data. Their experimental results show that the average operation numbers using the proposed Idct is approximately half that for the 8 x 8 Idct implemented in the MPEG-4 AVC/H.264 and HEVC reference software. The improved computational complexity of the proposed method is demonstrated by measuring the running time, which requires only one-half of the Idct time using the reference software.
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