Band separation filtering / inverse filtering for frame packing / unpacking higher-resolution chroma sampling formats

A computing device adapted to perform a method comprising:

• unpacking one or more frames of a lower-resolution chroma sampling format into one or more frames of a higher-resolution chroma sampling format, wherein the unpacking includes:
• assigning parts of the one or more frames of the lower-resolution chroma sampling format to sample values of plural bands;
• and
• performing inverse band separation filtering on the sample values of the plural bands to produce sample values of chroma components of the one or more frames of the higher-resolution chroma sampling format.

A computing device adapted to perform a method comprising:

• packing one or more frames of a higher-resolution chroma sampling format into one or more frames of a lower-resolution chroma sampling format, wherein the higher-resolution chroma sampling format is a 4:4:4 format, 4:2:2 format or 4:2:0 format, wherein the lower-resolution chroma sampling format is a 4:2:2 format, 4:2:0 format or 4:0:0 format lower than the higher-resolution chroma sampling format, and wherein the packing includes:
• performing wavelet decomposition on sample values of chroma components of the one or more frames of the higher-resolution chroma sampling format to produce sample values of plural bands;
• and
• assigning the sample values of the plural bands to parts of the one or more frames of the lower-resolution chroma sampling format.