Adaptive Implicit Transform Setting

An electronic apparatus comprising:

• an encoder circuit capable of:
• receiving a block of pixels of a video picture to be coded as a current block;
• performing an intra prediction operation for the current block according to an intra prediction setting and generating prediction residuals of the current block, the intra prediction setting selecting a current intra prediction mode from a plurality of intra prediction modes for the current block;
• mapping the current intra prediction mode to a target transform mode;
• and
• encoding the current block in a bitstream by performing a transform operation on the prediction residuals of the current block according to the target transform mode.

A decoding method, comprising:

• receiving a bitstream comprising coded prediction residuals of a current block of a video picture;
• determining a current intra prediction mode from a plurality of intra prediction modes for the current block according to an intra prediction setting;
• mapping the current intra prediction mode to a target transform mode;
• and
• decoding the current block by performing an inverse transform operation on the coded prediction residuals of the current block according to the target transform mode to generate prediction residuals of the current block and by reconstructing the current block based on the prediction residuals and a set of prediction pixels of the current block generated by performing an intra prediction operation for the current block according to the current intra prediction mode.

An electronic apparatus comprising:

• a decoder circuit capable of:
• receiving a bitstream comprising coded prediction residuals of a current block of a video picture;
• determining a current intra prediction mode from a plurality of intra prediction modes for the current block according to an intra prediction setting;
• mapping the current intra prediction mode to a target transform mode;
• and
• decoding the current block by performing an inverse transform operation on the coded prediction residuals of the current block according to the target transform mode to generate prediction residuals of the current block and by reconstructing the current block based on the prediction residuals and a set of prediction pixels of the current block generated by performing an intra prediction operation for the current block according to the current intra prediction mode.