Sughrue Mion, PLLC
Coupled primary and secondary transform
A method of controlling residual coding for decoding or encoding of a video sequence, is performed by at least one processor and includes determining whether a secondary transform is used, based on a primary transform that is set. The method further includes, based on the secondary transform being determined to be used setting a flag indicating whether the secondary transform is used to indicate that the secondary transform is used, determining the secondary transform, based on the set primary transform and an intra prediction mode of a current block of the video sequence, and performing the residual coding of a luma coding block of the current block and a chroma coding block of the current block, using the set primary transform and the determined secondary transform.
TENCENT AMERICA LLC
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Shan Xiang Xin
Liu Li Zhao