Method and system for processing video content
Embodiments of the present disclosure provides systems and methods for processing video content. The methods include: reconstructing a plurality of luma samples associated with a picture; and reconstructing a chroma block associated with the picture. The reconstructing of the chroma block includes: determining whether the chroma block has non-zero residues; and in response to a determination that the chroma block has one or more non-zero chroma residues, determining an averaged value of the plurality of reconstructed luma samples, and scaling residues of the chroma block based on the averaged value, prior to reconstructing the chroma block.
1. A computer-implemented video decoding method, comprising:
reconstructing a plurality of luma samples associated with a picture; and
reconstructing a chroma block associated with the picture,
wherein reconstructing the chroma block comprises:
determining whether the chroma block has non-zero residues; and
in response to a determination that the chroma block has one or more non-zero chroma residues, determining an averaged value of the plurality of reconstructed luma samples, and scaling residues of the chroma block based on the averaged value, prior to reconstructing the chroma block.
2. The method according to claim 1 , wherein reconstructing the chroma block further comprises:
in response to a determination that the chroma block has no non-zero chroma residues, bypassing the determining of the averaged value of the plurality of reconstructed luma samples.
3. The method according to claim 1 , where scaling the residuals of the chroma block based on the averaged value of the plurality of reconstructed luma samples comprises:
determining a chroma scaling factor based on the averaged value of the plurality of reconstructed luma samples; and
applying the chroma scaling factor to the residues of the chroma block.
4. The method according to claim 1 , wherein whether the chroma block has non-zero residuals is determined based on a value of a coded block flag associated with the chroma block.
5. The method according to claim 4 , further comprising:
in response to the value of the coded block flag being equal to 1, determining that the chroma block has one or more non-zero residuals.
6. The method according to claim 4 , further comprising:
in response to the value of the coded block flag being equal to 0, determining that the chroma block has no non-zero residuals.
7. The method according to claim 1 , wherein whether the chroma block has non-zero residuals is determined based on:
a value of a first coded block flag associated with a first chroma component of the chroma block, and
a value of a second coded block flag associated with a second chroma component of the chroma block.
8. The method according to claim 7 , further comprising:
in response to at least one of the value of the first coded block flag or the value of the second coded block flag being equal to 1, determining that the chroma block has one or more non-zero residuals.
9. The method according to claim 7 , further comprising:
in response to both the value of the first coded block flag and the value of the second coded block flag being equal to 0, determining that the chroma block has no non-zero residuals.
10. An apparatus, comprising:
one or more memories storing a set of instructions; and
one or more processors configured to execute the set of instructions to cause the apparatus to perform:
reconstructing a plurality of luma samples associated with a picture; and
reconstructing a chroma block associated with the picture,
wherein in reconstructing the chroma block, the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
determining whether the chroma block has non-zero residues; and
in response to a determination that the chroma block has one or more non-zero chroma residues, determining an averaged value of the plurality of reconstructed luma samples, and scaling residues of the chroma block based on the averaged value, prior to reconstructing the chroma block.
11. The apparatus according to claim 10 , wherein the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
in response to a determination that the chroma block has no non-zero chroma residues, bypassing the determining of the averaged value of the plurality of reconstructed luma samples.
12. The apparatus according to claim 10 , wherein the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
determining a chroma scaling factor based on the averaged value of the plurality of reconstructed luma samples; and
applying the chroma scaling factor to the residues of the chroma block.
13. The apparatus according to claim 10 , wherein the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
determining whether the chroma block has non-zero residuals, based on a value of a coded block flag associated with the chroma block.
14. The apparatus according to claim 13 , wherein the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
in response to the value of the coded block flag being equal to 1, determining that the chroma block has one or more non-zero residuals.
15. The apparatus according to claim 13 , wherein the one or more processors are configured to execute the set of instructions to cause the apparatus to further perform:
in response to the value of the coded block flag being equal to 0, determining that the chroma block has no non-zero residuals.
16. A non-transitory computer readable storage medium storing a bitstream associated with a video sequence, wherein the bitstream comprises coded information for reconstructing a chroma block associated with a picture, the coded information comprising:
a coded block flag indicating whether the chroma block has non-zero residuals,
wherein the bitstream is processed according to a method comprising:
reconstructing a plurality of luma samples associated with the picture; and
when the coded block flag indicates that the chroma block has one or more non-zero chroma residues, determining an averaged value of the plurality of reconstructed luma samples, and scaling residues of the chroma block based on the averaged value, prior to reconstructing the chroma block.
17. The non-transitory computer-readable storage medium according to claim 16 , wherein the method further comprises:
when the coded block flag indicates that the chroma block has no non-zero chroma residues, bypassing the determining of the averaged value of the plurality of reconstructed luma samples.
18. The non-transitory computer-readable storage medium according to claim 16 , where scaling the residuals of the chroma block based on the averaged value of the plurality of reconstructed luma samples comprises:
determining a chroma scaling factor based on the averaged value of the plurality of reconstructed luma samples; and
applying the chroma scaling factor to the residues of the chroma block.
19. The non-transitory computer-readable storage medium of claim 16 , wherein a value of the coded block flag being equal to 1 indicates that the chroma block has non-zero residuals, and the value of the coded block flag being equal to 0 indicates that the chroma block has no non-zero residuals.
20. The non-transitory computer-readable storage medium of claim 16 , wherein the coded block flag comprises:
a first coded block flag associated with a first chroma component of the chroma block, and
a second coded block flag associated with a second chroma component of the chroma block, wherein:
when at least one of a value of the first coded block flag or a value of the second coded block flag is equal to 1, it is indicated that the chroma block has one or more non-zero residuals; and
when both the value of the first coded block flag and the value of the second coded block flag are equal to 0, it is indicated that the chroma block has no non-zero residuals.