System and method for video coding
A decoder 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, and clips the first coefficient value. 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, and clips the second coefficient value. The circuitry generates a third coefficient value by adding the clipped first coefficient value to the clipped second coefficient value, and decodes a third reconstructed image sample of the chroma component using the third coefficient value.
1. A decoder comprising:
circuitry; and
memory coupled to the circuitry,
wherein 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;
clips the first coefficient value such that the clipped first coefficient value is within a first range from −2 7 to 2 7 −1 indicated by a first parameter;
generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
clips the second coefficient value such that the clipped second coefficient value is within a second range different from the first range, the second range being indicated by a second parameter;
generates a third coefficient value by adding the clipped first coefficient value to the clipped second coefficient value; and
decodes a third reconstructed image sample of the chroma component using the third coefficient value.
2. The decoder of claim 1 , wherein,
the first reconstructed image sample is located adjacent to the second reconstructed image sample.
3. The decoder of claim 1 , wherein the circuitry, in operation,
sets the first coefficient value to zero in response to the first coefficient value being less than 64.
4. A decoding method comprising:
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component;
clipping the first coefficient value such that the clipped first coefficient value is within a first range from −2 7 to 2 7 −1 indicated by a first parameter;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
clipping the second coefficient value such that the clipped second coefficient value is within a second range different from the first range, the second range being indicated by a second parameter;
generating a third coefficient value by adding the clipped first coefficient value to the clipped second coefficient value; and
decoding a third reconstructed image sample of the chroma component using the third coefficient value.
5. The decoding method of claim 4 , wherein,
the first reconstructed image sample is located adjacent to the second reconstructed image sample.
6. The decoding method of claim 4 , comprising:
setting the first coefficient value to zero in response to the first coefficient value being less than 64.