Base mesh coding by using surface reflection symmetry
A method of encoding includes receiving a polygon mesh comprising a plurality of original vertices. The method further includes deriving an initial base mesh from the polygon mesh, the initial base mesh including a first set of base mesh vertices. The method further includes performing a symmetrize process on the initial base mesh to generate a symmetrical base mesh that includes a first side having the first set of base mesh vertices and a second side having a second set of base mesh vertices, each base mesh vertex in the first set of base mesh vertices having a corresponding symmetric vertex in the second set of base mesh vertices. The method further includes determining a first displacement between each original vertex in the polygon mesh located on the second side of the symmetrical base mesh and a nearest vertex included in the second set of base mesh vertices.
1. A method of video encoding performed by at least one processor, the method comprising:
receiving a polygon mesh comprising a plurality of original vertices;
deriving an initial base mesh from the polygon mesh, the initial base mesh including a first set of base mesh vertices;
performing a symmetrize process on the initial base mesh to generate a symmetrical base mesh that includes a first side having the first set of base mesh vertices and a second side having a second set of base mesh vertices, each base mesh vertex in the first set of base mesh vertices having a corresponding symmetric vertex in the second set of base mesh vertices;
determining a first displacement between each original vertex in the polygon mesh located on the second side of the symmetrical base mesh and a nearest vertex included in the second set of base mesh vertices; and
generating a coded video bitstream comprising at least the first set of base mesh vertices and each determined first displacement.
2. The method according to claim 1 , further comprising:
determining a second displacement between each original vertex in the polygon mesh located on the first side of the symmetrical base mesh and a nearest vertex included in the first set of base mesh vertices,
wherein the coded video bitstream further comprises each determined second displacement.
3. The method according to claim 1 , wherein at least one determined first displacement includes a vertical displacement and a horizontal displacement.
4. The method according to claim 1 , wherein at least one determined second displacement includes a vertical displacement and a horizontal displacement.
5. The method according to claim 1 , wherein each determined first displacement is restricted to one of a horizontal displacement and a vertical displacement.
6. The method of according to claim 1 , wherein the symmetrize process further includes generating a symmetry plane that is included in the coded video bitstream.
7. The method according to claim 1 , wherein each base vertex in the first set of base mesh vertices has a zero displacement with each respective original vertex located on the first side.
8. An encoder, comprising:
at least one memory configured to store program code; and
at least one processor configured to read the program code and operate as instructed by the program code, the program code including:
receiving configured to cause the at least one processor to receive a polygon mesh comprising a plurality of original vertices,
deriving configured to cause the at least one processor to derive an initial base mesh from the polygon mesh, the initial base mesh including a first set of base mesh vertices,
performing configured to cause the at least one processor to perform a symmetrize process on the initial base mesh to generate a symmetrical base mesh that includes a first side having the first set of base mesh vertices and a second side having a second set of base mesh vertices, each base mesh vertex in the first set of base mesh vertices having a corresponding symmetric vertex in the second set of base mesh vertices,
first determining configured to cause the at least one processor to determine a first displacement between each original vertex in the polygon mesh located on the second side of the symmetrical base mesh and a nearest vertex included in the second set of base mesh vertices, and
generating configured to cause the at least one processor to generate a coded video bitstream comprising at least the first set of base mesh vertices and each determined first displacement.
9. The encoder according to claim 8 , further comprising:
second determining configured to cause the at least one processor to determine a second displacement between each original vertex in the polygon mesh located on the first side of the symmetrical base mesh and a nearest vertex included in the first set of base mesh vertices,
wherein the coded video bitstream further comprises each determined second displacement.
10. The encoder according to claim 8 , wherein at least one determined first displacement includes a vertical displacement and a horizontal displacement.
11. The encoder according to claim 8 , wherein at least one determined second displacement includes a vertical displacement and a horizontal displacement.
12. The encoder according to claim 8 , wherein each determined first displacement is restricted to one of a horizontal displacement and a vertical displacement.
13. The encoder according to claim 8 , wherein the symmetrize process further includes generating a symmetry plane that is included in the coded video bitstream.
14. The encoder according to claim 8 , wherein each base vertex in the first set of base mesh vertices has a zero displacement with each respective original vertex located on the first side.
15. A non-transitory computer readable medium having instructions stored therein, which, when executed by at least one processor in an encoder, cause the at least one processor to execute:
receiving a polygon mesh comprising a plurality of original vertices;
deriving an initial base mesh from the polygon mesh, the initial base mesh including a first set of base mesh vertices;
performing a symmetrize process on the initial base mesh to generate a symmetrical base mesh that includes a first side having the first set of base mesh vertices and a second side having a second set of base mesh vertices, each base mesh vertex in the first set of base mesh vertices having a corresponding symmetric vertex in the second set of base mesh vertices;
determining a first displacement between each original vertex in the polygon mesh located on the second side of the symmetrical base mesh and a nearest vertex included in the second set of base mesh vertices; and
generating a coded video bitstream comprising at least the first set of base mesh vertices and each determined first displacement.
16. The non-transitory computer readable medium according to claim 15 , wherein the instructions further cause the at least one processor to execute:
determining a second displacement between each original vertex in the polygon mesh located on the first side of the symmetrical base mesh and a nearest vertex included in the first set of base mesh vertices,
wherein the coded video bitstream further comprises each determined second displacement.
17. The non-transitory computer readable medium according to claim 15 , wherein at least one determined first displacement includes a vertical displacement and a horizontal displacement.
18. The non-transitory computer readable medium according to claim 15 , wherein at least one determined first side displacement includes a vertical displacement and a horizontal displacement.
19. The non-transitory computer readable medium according to claim 15 , wherein each determined first displacement is restricted to one of a horizontal displacement and a vertical displacement.
20. The non-transitory computer readable medium according to claim 15 , wherein the symmetrize process further includes generating a symmetry plane that is included in the coded video bitstream.