Encoder, a decoder and corresponding methods using for IBC merge list
The disclosure relates to a method of coding implemented by a decoding device, comprising: obtaining a value of a maximum number of merging motion vector prediction, MVP, candidates for a current block, wherein the current block is predicted using intra block copy, IBC mode; setting a value of a MVP index to zero, when the value of the maximum number of MVP candidates for the current block is equal to one; obtaining a motion vector of the current block according to the MVP index and a candidate list; obtaining prediction samples values of the current block according to the motion vector of the current block.
1 . A method of coding implemented by a decoding device, comprising:
performing entropy decoding to a bitstream to obtain a value of a maximum number of merging motion vector prediction (MVP) candidates for a current block, wherein the current block is predicted using intra block copy (IBC) mode;
setting a value of mvp_l0_flag[x0][y0] to zero, when the value of the maximum number of MVP candidates for the current block is equal to one; wherein, the mvp_l0_flag[x0][y0] specifies a motion predictor index of list 0, where x0, y0 specify a location (x0, y0) of a top-left luma sample of a coding block relative to a top-left luma sample of a picture; wherein the value of mvp_l0_flag[x0][y0] is not parsed from the bitstream;
obtaining a motion vector of the current block according to the mvp_l0_flag[x0][y0] and a candidate list;
obtaining prediction samples values of the current block according to the motion vector of the current block; and
parsing the mvp_l0_flag[x0][y0] from the bitstream, when the value of the maximum number of MVP candidates for the current block is greater than one.
2 . The method of claim 1 , wherein
the mvp_l0_flag[x0][y0] is parsed from a coding unit level.
3 . The method of claim 1 , wherein
the value of the maximum number of MVP candidates for the current block is obtained by parsing a sequence parameter set (sps) level from the bitstream.
4 . The method of claim 1 , wherein
the value of the maximum number of MVP candidates for the current block is obtained by parsing a syntax element on a slice level or tile group level or picture parameter set (pps) level from the bitstream.
5 . The method of claim 1 , wherein
the candidate list is obtained according to at least one neighboring block adjacent to the current block and a history based motion vector predictor (HMVP) list, wherein the at least one neighboring block is predicted using IBC mode.
6 . A decoder, comprising:
one or more processors; and
a computer-readable storage medium coupled to the one or more processors and storing programming for execution by the one or more processors, wherein the programming, when executed by the one or more processors, configures the decoder to perform operations of:
performing entropy decoding to a bitstream to obtain a value of a maximum number of merging motion vector prediction (MVP) candidates for a current block, wherein the current block is predicted using intra block copy (IBC) mode;
setting a value of mvp_l0_flag[x0][y0] to zero, when the value of the maximum number of MVP candidates for the current block is equal to one; wherein, the mvp_l0_flag[x0][y0] specifies a motion predictor index of list 0, where x0, y0 specify a location (x0, y0) of a top-left luma sample of a considered coding block relative to a top-left luma sample of a picture;
wherein the value of mvp_l0_flag[x0][y0] is not parsed from the bitstream;
obtaining a motion vector of the current block according to the mvp_l0_flag[x0][y0] and a candidate list;
obtaining prediction samples values of the current block according to the motion vector of the current block; and
parsing the mvp_l0_flag[x0][y0] from the bitstream, when the value of the maximum number of MVP candidates for the current block is greater than one.
7 . The decoder of claim 6 , wherein
the mvp_l0_flag[x0][y0] is parsed from a coding unit level.
8 . The decoder of claim 6 , wherein
the value of the maximum number of MVP candidates for the current block is obtained by parsing a sequence parameter set (sps) level from the bitstream.
9 . The decoder of claim 6 , wherein
the value of the maximum number of MVP candidates for the current block is obtained by parsing a syntax element on a slice level or tile group level or picture parameter set (pps) level from the bitstream.
10 . The decoder of claim 6 , wherein
the candidate list is obtained according to at least one neighboring block adjacent to the current block and a history based motion vector predictor (HMVP) list, wherein the at least one neighboring block is predicted using IBC mode.
11 . A non-transitory storage medium comprising
a bitstream and instructions which, when executed by a processor of a decoding device, cause the processor to:
perform entropy decoding to the bitstream to obtain a value of a maximum number of merging motion vector prediction (MVP) candidates for a current block, wherein the current block is predicted using intra block copy (IBC) mode;
set a value of mvp_l0_flag[x0][y0] to zero, when the value of the maximum number of MVP candidates for the current block is equal to one; wherein, the mvp_l0_flag[x0][y0] specifies a motion predictor index of list 0, where x0, y0 specify a location (x0, y0) of a top-left luma sample of a considered coding block relative to a top-left luma sample of a picture;
wherein the value of mvp_l0_flag[x0][y0] is not parsed from the bitstream;
obtain a motion vector of the current block according to the mvp_l0_flag[x0][y0] and a candidate list;
obtain prediction samples values of the current block according to the motion vector of the current block; and
parse the mvp_l0_flag[x0][y0] from the bitstream, when the value of the maximum number of MVP candidates for the current block is greater than one.
12 . The storage medium of claim 11 , wherein
the mvp_l0_flag[x0][y0] is parsed from a coding unit level.
13 . The storage medium of claim 11 , wherein
the value of the maximum number of MVP candidates for the current block is obtained by parsing a sequence parameter set (sps) level from the bitstream.
14 . The storage medium of claim 11 , wherein
the value of the maximum number of MVP candidates for the current block is obtained by parsing a syntax element on a slice level or tile group level or picture parameter set (pps) level from the bitstream.
15 . The storage medium of claim 11 , wherein
the candidate list is obtained according to at least one neighboring block adjacent to the current block and a history based motion vector predictor (HMVP) list, wherein the at least one neighboring block is predicted using IBC mode.