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. An encoder, comprising:
circuitry; and
memory coupled to the circuitry;
wherein the circuitry, in operation:
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;
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;
sets the first coefficient value to zero in response to the first coefficient value being less than 64;
generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generates a third coefficient value by adding the first coefficient value to the second coefficient value; and
outputs a third reconstructed image sample of the chroma component using the third coefficient value.
2. The encoder of claim 1 , wherein, the first reconstructed image sample is located adjacent to the second reconstructed image sample.
3. A decoder, comprising:
circuitry; and
memory coupled to the circuitry;
wherein the circuitry, in operation:
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;
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;
sets the first coefficient value to zero in response to the first coefficient value being less than 64;
generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generates a third coefficient value by adding the first coefficient value to the second coefficient value; and
outputs a third reconstructed image sample of the chroma component using the third coefficient value.
4. The decoder of claim 3 , wherein, the first reconstructed image sample is located adjacent to the second reconstructed image sample.
5. An encoding method, comprising:
in response to a first reconstructed image sample being located outside a virtual boundary, duplicating a reconstructed sample located inside and adjacent to the virtual boundary to generate the first reconstructed image sample;
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generating a third coefficient value by adding the first coefficient value to the second coefficient value; and
outputting a third reconstructed image sample of the chroma component using the third coefficient value.
6. A decoding method, comprising:
in response to a first reconstructed image sample being located outside a virtual boundary, duplicating a reconstructed sample located inside and adjacent to the virtual boundary to generate the first reconstructed image sample;
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64;
generating a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component;
generating a third coefficient value by adding the first coefficient value to the second coefficient value; and
outputting a third reconstructed image sample of the chroma component using the third coefficient value.
7. An encoder, comprising:
circuitry; and
memory coupled to the circuitry;
wherein the circuitry, in operation:
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;
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;
sets the first coefficient value to zero in response to the first coefficient value being less than 64; and
outputs a second reconstructed image sample of a chroma component using the first coefficient value.
8. A decoder, comprising:
circuitry; and
memory coupled to the circuitry;
wherein the circuitry, in operation:
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;
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;
sets the first coefficient value to zero in response to the first coefficient value being less than 64; and
outputs a second reconstructed image sample of a chroma component using the first coefficient value.
9. An encoding method, comprising:
in response to a first reconstructed image sample being located outside a virtual boundary, duplicating a reconstructed sample located inside and adjacent to the virtual boundary to generate the first reconstructed image sample;
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64; and
outputting a second reconstructed image sample of a chroma component using the first coefficient value.
10. A decoding method, comprising:
in response to a first reconstructed image sample being located outside a virtual boundary, duplicating a reconstructed sample located inside and adjacent to the virtual boundary to generate the first reconstructed image sample;
generating a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to the first reconstructed image sample of a luma component;
setting the first coefficient value to zero in response to the first coefficient value being less than 64; and
outputting a second reconstructed image sample of a chroma component using the first coefficient value.