Method and apparatus of shared merge candidate list region for video coding
A method and apparatus of video coding using history-based candidate derivation are disclosed. According to one method, a current block is inside a Shared Merge candidate list Region (SMR) or a history-based parallel processing region is received. The current block is encoded or decoded using a Merge candidate list. Only if the current block is one of first-coded N (N≥0) blocks, one of last-coded N blocks, or one of selected N blocks, the history-based candidate list is updated after the current block is encoded or decoded. In one embodiment, Merge candidate list is pre-generated for the current block in the SMR and is separately generated for the current block in the history-based parallel processing region. In another method, if the current block is inside the SMR or the history-based parallel processing region, the current block is encoded or decoded using a history-based candidate list associated with the root CU.
1. A method of video coding using history-based candidate derivation, wherein a history-based candidate list is updated during encoding or decoding, 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, wherein the current block is inside a Shared Merge candidate list Region (SMR) or a history-based parallel processing region;
encoding or decoding the current block using a Merge candidate list; and
only if the current block is one of last-coded N blocks in the SMR or the history-based parallel processing region, updating the history-based candidate list after the current block is encoded or decoded, wherein the N is an integer equal to 1, and wherein the history-based candidate list is restricted from updating after the current block is encoded or decoded except when the current block is a last block in the SMR or the history-based parallel processing region.
2. The method of claim 1 , wherein the N is a pre-defined value.
3. The method of claim 2 , wherein the pre-defined value is signalled in a sequence, picture, or slice level in the video encoder side or the pre-defined value is parsed in the sequence, picture, or slice level in the video decoder side.
4. The method of claim 1 , wherein the Merge candidate list is pre-generated for the current block in the SMR and is separately generated for the current block in the history-based parallel processing region.
5. An apparatus of video coding using history-based candidate derivation, wherein a history-based candidate list is updated during encoding or decoding, 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, wherein the current block is inside a Shared Merge candidate list Region (SMR) or a history-based parallel processing region;
encode or decode the current block using a Merge candidate list; and
only if the current block is one of last-coded N blocks in the SMR or the history-based parallel processing region, update the history-based candidate list after the current block is encoded or decoded, wherein the N is an integer equal to 1, and wherein the history-based candidate list is restricted from updating after the current block is encoded or decoded except when the current block is a last block in the SMR or the history-based parallel processing region.
6. A method of video coding using history-based candidate derivation, wherein a history-based candidate list is updated during encoding or decoding, the method comprising:
determining a root CU (Coding Unit) for a Shared Merge candidate list Region (SMR) or a history-based parallel processing region;
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; and
if the current block is inside the SMR or the history-based parallel processing region, encoding or decoding the current block using the history-based candidate list associated with the root CU.
7. The method of claim 6 , wherein if the current block is inside the SMR or the history-based parallel processing region, the history-based candidate list is restricted from updating after the current block is encoded or decoded.
8. The method of claim 6 , wherein if the current block is not inside the SMR or the history-based parallel processing region, the history-based candidate list is updated after the current block is encoded or decoded.
9. An apparatus of video coding using history-based candidate derivation, wherein a history-based candidate list is updated during encoding or decoding, the apparatus comprising one or more electronic circuits or processors arranged to:
determine a root CU (Coding Unit) for a Shared Merge candidate list Region (SMR) or a history-based parallel processing region;
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; and
if the current block is inside the SMR or the history-based parallel processing region, encode or decode the current block using the history-based candidate list associated with the root CU.