Packing displacement component sample in the displacement video frame for dynamic mesh coding

A method comprising:

• receiving a compressed bitstream including an encoded displacements bitstream and packing method information indicating whether displacement component samples are packed in ascending order or in descending order, wherein the displacement component samples are packed in ascending order when the packing method information is equal to a first value, and the displacement component samples are packed in descending order when the packing method information is equal to a second value, wherein the first value is 0 and the second value is 1;
• decoding the packing method information;
• video-decoding the encoded displacements bitstream to generate a displacement video frame;
• image-unpacking the displacement video frame to generate an array of quantized displacement wavelet coefficients, wherein the displacement video frame includes padding at a lower area of the displacement video frame irrespective of whether the displacement component samples are packed in descending order;
• inverse-quantizing the array of quantized displacement wavelet coefficients to generate displacement wavelet coefficients;
• and
• inverse-wavelet-transforming the displacement wavelet coefficients to generate displacement component samples.

An apparatus comprising:

• a communication interface;
• and
• a processor operably coupled to the communication interface, the processor configured to cause:
• encoding packing method information indicating whether displacement component samples are packed in ascending order or in descending order, wherein the displacement component samples are packed in ascending order when the packing method information is equal to a first value, and the displacement component samples are packed in descending order when the packing method information is equal to a second value, wherein the first value is 0 and the second value is 1;
• wavelet-transforming displacement component samples to generate displacement wavelet coefficients;
• quantizing the displacement wavelet coefficients to generate an array of quantized displacement wavelet coefficients;
• image-packing the array of quantized displacement wavelet coefficients to generate a displacement video frame, wherein padding is added at a lower area of the displacement video frame irrespective of whether the displacement component samples are packed in descending order;
• video-encoding the displacement video frame to generate an encoded displacements bitstream;
• and
• combining the encoded packing method information and the encoded displacements bitstream into a compressed bitstream.