Methods and apparatus of video coding for triangle prediction
View Patent ↗A method for video coding is provided. The method includes: partitioning video pictures into a plurality of coding units (CUs), at least one of which is further portioned into two prediction units (PUs) including at least one triangular shaped PU with a partitioning orientation in one of: from top-left corner to bottom-right corner, and from top-right corner to bottom-left corner; constructing a uni-prediction motion vector candidate list; determining whether a current CU is coded as triangle prediction mode according to coded information; signaling a partition orientation flag indicating the partitioning orientation; and signaling index values that indicate selected entries in the constructed uni-prediction motion vector candidate list.
1. A method for video decoding, comprising:
obtaining video pictures, wherein the video pictures are partitioned into a plurality of coding units (CUs), at least one of which is further partitioned into two prediction units (PUs); and
in response to determining that a current CU is coded in an inter prediction mode,
determining whether the current CU is coded in a triangle prediction mode according to coded information; and
in response to determining that the current CU is coded in the triangle prediction mode, obtaining a partition orientation syntax element indicating a partitioning orientation, and obtaining index values corresponding to uni-prediction motion vector candidates;
wherein determining whether the current CU is coded in the triangle prediction mode according to the coded information comprises:
in response to determining that a triangle prediction tool enable/disable flag signaled in sequence parameter set (SPS) is false, inferring that the current CU is not coded in the triangle prediction mode.
2. The method of claim 1 , wherein the uni-prediction motion vector candidates comprises two uni-prediction motion vector candidates.
3. The method of claim 1 , wherein the partition orientation syntax element is coded as Context-based Adaptive Binary Arithmetic Coding (CABAC) bypass bin.
4. The method of claim 1 , wherein determining whether the current CU is coded in the triangle prediction mode according to the coded information comprises: determining whether a triangle prediction flag, which indicates triangle prediction mode, is to be 0 or 1 for the current CU, according to the coded information.
5. The method of claim 1 , further comprising:
inter-predicting each PU using its own uni-prediction motion vector and reference frame index.
6. The method of claim 1 , wherein determining whether the current CU is coded in the triangle prediction mode according to the coded information further comprises:
in response to determining that all other merge related modes are signaled as disabled according to the coded information and the triangle prediction tool enable/disable flag is true, inferring that the current CU is coded in the triangle prediction mode.
7. The method of claim 6 , wherein the all other merge related modes comprise Combined Inter and Intra Prediction (CIIP) mode, sub-block merge mode and Merge Mode with Motion Vector Difference (MMVD) mode.
8. An apparatus for video decoding, 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:
obtain video pictures, wherein the video pictures are partitioned into a plurality of coding units (CUs), at least one of which is further partitioned into two prediction units (PUs); and
in response to determining that a current CU is coded in an inter prediction mode,
determine whether the current CU is coded in a triangle prediction mode according to coded information; and
in response to determining that the current CU is coded in the triangle prediction mode, obtain a partition orientation syntax element indicating a partitioning orientation, and obtain index values corresponding to uni-prediction motion vector candidates;
wherein the processor is configured to determine whether the current CU is coded in the triangle prediction mode according to the coded information comprises:
in response to determining that a triangle prediction tool enable/disable flag signaled in sequence parameter set (SPS) is false, inferring that the current CU is not coded in the triangle prediction mode.
9. The apparatus of claim 8 , wherein the uni-prediction motion vector candidates comprises two uni-prediction motion vector candidates.
10. The apparatus of claim 8 , wherein the partition orientation syntax element is coded as Context-based Adaptive Binary Arithmetic Coding (CABAC) bypass bin.
11. The apparatus of claim 8 , wherein the processor is configured to determine whether the current CU is coded in the triangle prediction mode according to the coded information comprising:
determine whether a triangle prediction flag, which indicates triangle prediction mode, is to be 0 or 1 for a current CU, according to the coded information.
12. The apparatus of claim 8 , wherein the processor is further configured to:
inter-predict each PU using its own uni-prediction motion vector and reference frame index.
13. The apparatus of claim 8 , wherein the processor is configured to determine whether the current CU is coded in the triangle prediction mode according to the coded information further comprising:
in response to determining that all other merge related modes are signaled as disabled according to the coded information and the triangle prediction tool enable/disable flag is true, inferring that the current CU is coded in the triangle prediction mode.
14. The apparatus of claim 13 , wherein the all other merge related modes comprise Combined Inter and Intra Prediction (CIIP) mode, sub-block merge mode and Merge Mode with Motion Vector Difference (MMVD) mode.
15. A non-transitory computer readable storage medium storing a plurality of programs for execution by a computing device having one or more processors, wherein the plurality of programs, when executed by the one or more processors, cause the computing device to perform operations comprising:
obtaining video pictures, wherein the video pictures are partitioned into a plurality of coding units (CUs), at least one of which is further partitioned into two prediction units (PUs);
in response to determining that a current CU is coded in an inter prediction mode,
determining whether the current CU is coded as triangle prediction mode according to coded information; and
in response to determining that the current CU is coded in the triangle prediction mode, obtaining a partition orientation syntax element indicating a partitioning orientation, and obtaining index values corresponding to uni-prediction motion vector candidates;
wherein determining whether the current CU is coded in the triangle prediction mode according to the coded information comprises:
in response to determining that a triangle prediction tool enable/disable flag signaled in sequence parameter set (SPS) is false, inferring that the current CU is not coded in the triangle prediction mode.