Method of Lookup Table Size Reduction for Depth Modelling Mode in Depth Coding

A method of depth decoding using depth modelling mode 1 (DMM1) for a depth block in a three-dimensional (3D) or multi-view video decoding system, the method comprising:

• receiving a video bitstream including compressed data for a current depth block;
• determining, from the video bitstream, a wedgelet pattern index;
• constraining the wedgelet pattern index to a constrained wedgelet pattern index to always point to a valid entry in a wedgelet pattern table;
• retrieving a wedgelet pattern from the wedgelet pattern table using the constrained wedgelet pattern index;
• and
• decoding, from the compressed data, the current depth block according to DMM1 mode using the wedgelet pattern retrieved.

A method of depth coding using depth modelling mode 1 (DMM1) for a depth block in a three-dimensional (3D) or multi-view video decoding system, the method comprising:

• receiving a video bitstream including compressed data for a current depth block;
• determining all possible wedgelet pattern indices;
• if any possible wedgelet pattern index is not less than a total number of wedgelet patterns in a wedgelet pattern table, constructing one or more wedgelet pattern entries corresponding to one or more allowed wedgelet pattern indices not less than the total number of wedgelet patterns in the wedgelet pattern table;
• determining, from the video bitstream, a current wedgelet pattern index;
• retrieving a current wedgelet pattern from the wedgelet pattern table using the current wedgelet pattern index;
• and
• decoding, from the compressed data, the current depth block according to DMM1 mode using the current wedgelet pattern retrieved.

A method of deriving wedgelet patterns for depth encoding using depth modelling mode 1 (DMM1) for a depth block in a three-dimensional (3D) or multi-view video coding system, the method comprising:

• determining one or more starting positions and one or more ending positions for a size-reduced wedgelet pattern by excluding at least one non-corner adjacent-edge sample for adjacent-edge partition or at least one opposite-edge sample for opposite-edge partition from said one or more starting positions or from said one or more ending positions;
• generating the size-reduced wedgelet pattern according to said one or more starting positions and said one or more ending positions;
• and
• encoding a depth block according to DMM1 mode using a reduced wedgelet pattern table including the size-reduced wedgelet pattern.