Shuffled Discrete Sine Transform in Inter-Prediction Coding
Jun-woo Choi, Nam-Uk Kim, Sung-Chang Lim, Jungwon Kang, Hui Yong Kim, Yung-Lyul Lee · ETRI Journal · 2017
Video compression exploits statistical, spatial, and temporal redundancy, as well as transform and quantization.In particular, the transform in a frequency domain plays a major role in energy compaction of spatial domain data into frequency domain data.The high efficient video coding standard uses the type-II discrete cosine transform (DCT-II) and type-VII discrete sine transform (DST-VII) to improve the coding efficiency of residual data.However, the DST-VII is applied only to the Intra 4 3 4 residual block because it yields relatively small gains in the larger block than in the 4 3 4 block.In this study, after rearranging the data of the residual block, we apply the DST-VII to the inter-residual block to achieve coding gain.The rearrangement of the residual block data is similar to the arrangement of the basis vector with a the lowest frequency component of the DST-VII.Experimental results show that the proposed method reduces the luma-chroma (Cb+Cr) BD rates by approximately 0.23% to 0.22%, 0.44% to 0.58%, and 0.46% to 0.65% for the random access, low delay B, and low delay P configurations, respectively.