Method and Apparatus of Combined Inter and Intra Prediction for Video Coding

An apparatus of video coding, the apparatus comprising one or more electronic circuits or processors arranged to:

• receive input data related to a current block in a current picture at a video encoder side or a video bitstream corresponding to compressed data including the current block in the current picture at a video decoder side;
• partition the current block into a first region and a second region using a target partition selected from a partition set comprising triangle partition;
• determine a Merge candidate list for a partitioned current block by including at least one HMVP (history-based motion vector prediction) candidate from an HMVP buffer, wherein the HMVP buffer stores motion information of one or more previously coded blocks;
• and
• encode the partitioned current block or current motion information associated with the partitioned current block using the Merge candidate list at the video encoder side, or decode the partitioned current block or the current motion information associated with the partitioned current block using the Merge candidate list at the video decoder side, wherein the Merge candidate list is used to derive a first candidate for the first region and a second candidate for the second region.

A method of prediction for video coding, the method comprising:

• receiving input data related to a current block in a current picture at a video encoder side or a video bitstream corresponding to compressed data including the current block in the current picture at a video decoder side;
• determining whether to apply triangular CIIP (combined Inter/Intra prediction) to the current block;
• if the triangular CIIP is applied to the current block:
• partitioning the current block into a first region and a second region using a triangle partition;
• determining an Inter predictor for the first region and an Intra predictor for the second region;
• and
• encoding or decoding the first region using the Inter predictor and encoding or decoding the second region using the Intra predictor.

An apparatus of video coding, the apparatus comprising one or more electronic circuits or processors arranged to:

• receive input data related to a current block in a current picture at a video encoder side or a video bitstream corresponding to compressed data including the current block in the current picture at a video decoder side;
• determine whether to apply triangular CIIP (combined Inter/Intra prediction) to the current block;
• if the triangular CIIP is applied to the current block:
• partition the current block into a first region and a second region using a triangle partition;
• determine an Inter predictor for the first region and an Intra predictor for the second region;
• and
• encode or decode the first region using the Inter predictor and encode or decode the second region using the Intra predictor.