V-DMC displacement vector quantization

A method of decoding encoded mesh data, the method comprising:

• determining, based on the encoded mesh data, a base mesh;
• determining, based on the encoded mesh data, a set of coefficients;
• receiving in the encoded mesh data a quantization parameter value;
• receiving in the encoded mesh data a bit depth offset value;
• determining an inverse scaling factor based on the quantization parameter value and adding the bit depth offset value to a constant value;
• performing an inverse scaling on the set of coefficients based on the inverse scaling factor to determine a set of de-quantized coefficients;
• determining a displacement vector based on the set of de-quantized coefficients;
• deforming the base mesh based on the displacement vector to determine a decoded mesh;
• and
• outputting the decoded mesh.

A computer-readable storage medium storing instructions that when executed by one or more processors cause the one or more processors to:

• determine, based on encoded mesh data, a base mesh;
• determine, based on the encoded mesh data, a set of coefficients;
• receive in the encoded mesh data a quantization parameter value;
• receive in the encoded mesh data a bit depth offset value;
• determine an inverse scaling factor based on the quantization parameter value and adding the bit depth offset value to a constant value;
• perform an inverse scaling on the set of coefficients based on the inverse scaling factor to determine a set of de-quantized coefficients;
• determine a displacement vector based on the set of de-quantized coefficients;
• deform the base mesh based on the displacement vector to determine a decoded mesh;
• and
• output the decoded mesh.

A device for encoding unencoded mesh data, the device comprising:

• one or more memory units;
• one or more processing units implemented in circuitry, coupled to the one or more memory units, and configured to:
• determine, from on an unencoded mesh, a base mesh;
• determine a set of displacement vectors for deforming the base mesh;
• transform the set of displacement vectors to determine a set of coefficients;
• perform a scaling on the set of coefficients based on a scaling factor to determine a set of scaled coefficients, wherein the scaling factor is a function of a quantization parameter value and a bit depth offset value added to a constant value;
• and
• generate an encoded bitstream that includes the quantization parameter value and the bit depth offset value.