Transform selection through block matching

A method of video decoding, comprising:

• receiving a coded video bitstream that includes a current picture including a current block coded with one of an intra block copy (IBC) mode and an intra template matching (IntraTMP) mode;
• determining an intra prediction mode associated with a reference block of the current block, the reference block being indicated by a block vector (BV) of the current block used in the one of the IBC mode and the IntraTMP mode;
• determining a transform set for the current block coded with the one of the IBC mode and the IntraTMP mode according to the intra prediction mode associated with the reference block;
• and
• performing an inverse transform on the current block according to the determined transform set.

A method of video decoding, comprising:

• receiving a coded video bitstream that includes a current picture including a current block coded with an inter prediction mode;
• determining an intra prediction mode associated with a reference block of the current block that is indicated by a motion vector (MV) of the current block, at least a portion of the reference block being coded for intra prediction;
• determining a transform set for the current block according to the intra prediction mode associated with the reference block;
• and
• performing an inverse transform on the current block according to the determined transform set.