System and method for video coding
An encoder includes circuitry and memory coupled to the circuitry. The circuitry, in response to a first reconstructed image sample being located outside a virtual boundary, duplicates a reconstructed sample located inside and adjacent to the virtual boundary to generate the first reconstructed image sample. The circuitry generates a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component. The circuitry generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component. The circuitry generates a third coefficient value by adding the first coefficient value to the second coefficient value, and encodes a third reconstructed image sample of the chroma component using the third coefficient value.
1. A non-transitory computer readable medium storing a bitstream containing information according to which an encoder performs an encoding process, wherein in the encoding process:
in response to a first reconstructed image sample being located outside a virtual boundary, a reconstructed sample located inside and adjacent to the virtual boundary is duplicated to generate the first reconstructed image sample;
a first coefficient value is generated by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component;
the first coefficient value is set to zero in response to the first coefficient value being less than 64; and
a second reconstructed image sample of a chroma component is outputted using the first coefficient value.
2. A non-transitory computer readable medium storing a bitstream containing information according to which a decoder performs a decoding process, wherein in the decoding process:
in response to a first reconstructed image sample being located outside a virtual boundary, a reconstructed sample located inside and adjacent to the virtual boundary is duplicated to generate the first reconstructed image sample;
a first coefficient value is generated by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component;
the first coefficient value is set to zero in response to the first coefficient value being less than 64; and
a second reconstructed image sample of a chroma component is outputted using the first coefficient value.