Primary transforms for cross-component level reconstruction
地域：
CA
CA Palo Alto
摘要
This disclosure relates generally to video coding and particularly to cross component level reconstruction. For example, a method is disclosed for processing video data which may include extracting a first transform block of a first color component and a second transform block of a second color component from a bitstream of a video block; determining that transform coefficients in the first transform block are all zero; determining that a CCLR is applied to the first transform block; refining one or more of the transform coefficients in the first transform block, to obtain a refined first transform block; determining a target transform kernel for the refined first transform block; performing a reverse transform on the refined first transform block based on the target transform kernel to obtain a target block; and reconstructing the first color component of the video block based on at least the target block.
說(shuō)明書(shū)
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The LGTs can then be derived by the eigen-decomposition of the GGL Lc. Lc=UΦUT??(2)
where columns of orthogonal matrix U are the basis vectors of the LGT, and Φ is the diagonal eigenvalue matrix. In fact, DCTs and DSTs, including DCT-2, DCT-8 and DST7, are LGTs derived from certain forms of GGLs. DCT-2 is derived by setting Vc1=0; DST-7 is derived by setting Vc=Wc; DCT-8 is derived by setting Vc2=Wc; DST-4 is derived by setting Vc1=2wc; and DCT-4 is derived by setting Vc2=2wc.
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