Shuffled Discrete Sine Transform in Inter‐Prediction Coding
ETRI Journal(2017)
摘要
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 × 4 residual block because it yields relatively small
gains in the larger block than in the 4 × 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.
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关键词
HEVC/H.265,Inter‐coding,Residual data,DST‐VII,DCT‐II
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