V3C patch remeshing for dynamic mesh coding

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
• receive a three-dimensional object comprising at least one patch, at least one geometry component, at least one occupancy component, and zero or more texture components;
• define multiple sets of parameters describing sub-sampling criteria, a size of a search window, and types of salient points;
• generate a mesh using a depth patch triangulation method using the sets of parameters to approximate a shape of the three-dimensional object;
• evaluate a quality of a depth patch triangulation compared to a reconstructed three-dimensional object reconstructed without triangulated depth patches;
• iterate until a reconstructed three-dimensional object using the depth patch triangulation method reaches an expected improved quality;
• derive at least one parameter used to code the mesh with improved quality;
• and
• transmit to a decoder the coded mesh as a bitstream and the at least one parameter.

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
• receive a coded mesh as a bitstream, wherein the mesh is used to approximate a shape of a three-dimensional object;
• wherein the mesh has been coded with depth patch triangulation method using multiple sets of parameters to approximate the shape of the three-dimensional object;
• wherein the multiple sets of parameters describe sub-sampling criteria, a size of a search window, and types of salient points;
• receive at least one parameter used to code the mesh with improved quality;
• and
• reconstruct the mesh from the bitstream using the at least one parameter.

An apparatus comprising:

• at least one processor;
• and
• at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
• receive signaling from an encoder, the signaling related to encoding a three-dimensional model comprising at least one patch, at least one geometry component, at least one occupancy component, and zero or more texture components;
• subsample the at least one geometry component of the at least one patch of a three-dimensional object at occupied positions using a subsampling criterion;
• define respective search windows around the respective occupied positions;
• select respective salient points relative to the respective occupied positions within the respective search windows;
• triangulate the salient points to approximate a shape of the three-dimensional object;
• detect zero or more triangles that overlap with at least one unoccupied pixel;
• split the zero or more triangles that overlap with at least one unoccupied pixel until no triangle overlaps with the unoccupied pixels;
• add zero or more additional triangles close to a border of the three-dimensional object;
• and
• reconstruct a mesh of the three-dimensional object, based on the received signaling.