HEVC Lossless Compression Coding Based on Hadamard Butterfly Transformation

Efficient video transmission has always been an important challenge in the field of computer networks. Elegant compression coding strategy will signicantly alleviate the heavy burden on network bandwidth. High Efficiency Video Coding (HEVC) is currently the newest video coding standard widely used in different fields, including lossy compression coding and lossless compression coding. In HEVC, each coding unit consists of a luma coding unit and a chromaticity coding unit. In this paper, a transformation based on Walsh-Hadamard butterfly transformation is applied to residuals of the luma coding block, and the element of the residual block is the difference between the frame brightness block and the reference pixel according to the prediction method. With the transformation proposed in this paper, the bits of residual coding can be effectively economized, and therefore, the bit rate of non-destructive coding transmission in frames can be reduced. Adaptively selecting between the proposed method and the direct residual transmission methods of HEVC itself effectively improves the performance of the coding. Experiment results show that compared with HM15.0, the bit rate of the videos is reduced for the five standard sequences.

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