Methods and apparatus of video coding for triangle prediction

An apparatus for video encoding, comprising:

• a processor;
• and
• a memory configured to store instructions executable by the processor;
• wherein the processor, upon execution of the instructions, is configured to:
• partition a video picture into a plurality of coding units (CUs), wherein at least one of the plurality of CUs is further partitioned into two prediction units (PUs);
• and
• in response to that a current CU is coded in an inter prediction mode,
• signal coded information for inferring whether the current CU is coded in triangle prediction mode;
• and
• in response to determining that the current CU is coded in the triangle prediction mode, signal a partition orientation syntax element indicating a partitioning orientation, and signal index values corresponding to uni-prediction motion vector candidates;
• wherein the coded information comprises a triangle prediction tool enable/disable flag signaled in sequence parameter set (SPS), and the current CU is inferred as not being coded in the triangle prediction mode in response to determining that the triangle prediction tool enable/disable flag is false.

A non-transitory computer readable storage medium storing encoded video data, wherein the encoded video data is generated by operations comprising:

• partitioning a video picture into a plurality of coding units (CUs), wherein at least one of the plurality of CUs is further partitioned into two prediction units (PUs);
• and
• in response to determining that a current CU is coded in an inter prediction mode,
• signaling coded information for inferring whether the current CU is coded in triangle prediction mode;
• and
• in response to determining that the current CU is coded in the triangle prediction mode, signaling a partition orientation syntax element indicating a partitioning orientation, and signaling index values corresponding to uni-prediction motion vector candidates;
• wherein the coded information comprises a triangle prediction tool enable/disable flag signaled in sequence parameter set (SPS), and the current CU is inferred as not being coded in the triangle prediction mode in response to determining that the triangle prediction tool enable/disable flag is false.