System and method for video coding
An encoder includes circuitry and memory coupled to the circuitry. The circuitry, in operation, generates a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component, generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component, and clips the second coefficient value. The circuitry generates a third coefficient value by adding the first coefficient value to the clipped second coefficient value, and clips the third coefficient value. The circuitry encodes a third reconstructed image sample of the chroma component using the clipped 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:
a first coefficient value is generated by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component;
the first coefficient value is set to zero in a case where the first coefficient value is less than 64;
a second coefficient value is generated by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
the second coefficient value is clipped;
a third coefficient value is generated by adding the first coefficient value to the clipped second coefficient value;
the third coefficient value is clipped; and
a third reconstructed image sample of the chroma component is encoded using the clipped third 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:
a first coefficient value is generated by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component;
the first coefficient value is set to zero in a case where the first coefficient value is less than 64;
a second coefficient value is generated by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
the second coefficient value is clipped;
a third coefficient value is generated by adding the first coefficient value to the clipped second coefficient value;
the third coefficient value is clipped; and
a third reconstructed image sample of the chroma component is decoded using the clipped third coefficient value.