Encoding method, decoding method, and decoder

A decoding method, comprising:

• decoding a bitstream to generate a base mesh, and recursively subdividing to a plurality of level of details;
• decoding a coded displacement component of the bitstream;
• decoding the bitstream to obtain a plurality of flags and corresponding syntax elements;
• reconstructing a plurality of values of a plurality of coded displacement wavelet coefficients;
• processing the plurality of coded displacement wavelet coefficients by an inverse wavelet transform to generate a plurality of mesh displacements;
• and
• generating a reconstructed mesh by applying the plurality of mesh displacements to a subdivided base mesh at each level of transform recursively.

A decoder, comprising:

• a memory, configured to store a plurality of instructions, and
• a processor, electrically connected to the memory, and configured to execute the plurality of instructions to implement the following decoding operations,
• wherein the processor is configured to decode a bitstream to generate a base mesh, and recursively subdividing to a plurality of level of details, and is configured to decode a coded displacement component of the bitstream,
• wherein the processor is configured to decode the bitstream to obtain a plurality of flags and corresponding syntax elements, and is configured to reconstruct a plurality of values of a plurality of coded displacement wavelet coefficients,
• wherein the processor is configured to process the plurality of coded displacement wavelet coefficients by an inverse wavelet transform to generate a plurality of mesh displacements, and is configured to generate a reconstructed mesh by applying the plurality of mesh displacements to a subdivided base mesh at each level of transform recursively.