Video colour component prediction method and apparatus, and computer storage medium
A video colour component prediction method and apparatus, and a computer storage medium are provided. The prediction method includes: obtaining a first colour component neighboring reference value and a first colour component reconstructed value corresponding to a current coding block, wherein the first colour component neighboring reference value represents a first colour component parameter corresponding to a neighboring reference sample of the current coding block, and the first colour component reconstructed value represents one or more reconstruction parameters of a first colour component corresponding to the current coding block; determining a weight coefficient corresponding to the neighboring reference sample; determining a scale factor according to the weight coefficient and the first colour component neighboring reference value; and obtaining a second colour component predicted value corresponding to the current coded block based on a linear model corresponding to the scale factor.
1. A method for decoding a video, comprising:
acquiring a first colour component neighboring reference value, a second colour component neighboring reference value and a first colour component reconstructed value corresponding to a current block, wherein the first colour component neighboring reference value is indicative of a first colour component parameter corresponding to a neighboring reference sample of the current block, the second colour component neighboring reference value is indicative of a second colour component parameter corresponding to the neighboring reference sample of the current block, and the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block;
generating a second colour component predicted value corresponding to the current block at least based on a linear model corresponding to factors, wherein the factors are determined by at least one of a weight coefficient, the first colour component neighboring reference value, or the second colour component neighboring reference value; and
decoding the video based on the second colour component predicted value.
2. The method of claim 1 , further comprising:
generating the second colour component predicted value based on the linear model corresponding to the factors and the first colour component reconstructed value.
3. The method of claim 1 , wherein a position of the current block is indicative of a position correlation between the current block and the neighboring reference sample.
4. The method of claim 1 , further comprising:
acquiring a second colour component estimated value corresponding to the current block by performing component prediction according to a second colour component corresponding to the current block.
5. The method of claim 1 , further comprising:
performing downsampling on the neighboring reference sample to determine part of reference samples based on a preset threshold.
6. The method of claim 1 , wherein the neighboring reference sample comprises at least one of:
an upper reference sample of the current block,
an upper-left reference sample of the current block; or
a left reference sample of the current block.
7. A decoding apparatus, comprising:
a processor; and
a memory storing an instruction executable by the processor, wherein when the instruction is executed, the processor is configured to:
acquire a first colour component neighboring reference value, a second colour component neighboring reference value and a first colour component reconstructed value corresponding to a current block, wherein the first colour component neighboring reference value is indicative of a first colour component parameter corresponding to a neighboring reference sample of the current block, the second colour component neighboring reference value is indicative of a second colour component parameter corresponding to the neighboring reference sample of the current block, and the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block;
generate a second colour component predicted value corresponding to the current block at least based on a linear model corresponding to factors, wherein the factors are determined by at least one of a weight coefficient, the first colour component neighboring reference value, or the second colour component neighboring reference value; and
decode the current block based on the second colour component predicted value.
8. The apparatus of claim 7 , wherein the processor is further configured to:
generate the second colour component predicted value based on the linear model corresponding to the factors and the first colour component reconstructed value.
9. The apparatus of claim 7 , wherein a position of the current block is indicative of a position correlation between the current block and the neighboring reference sample.
10. The apparatus of claim 7 , wherein the processor is further configured to:
acquire a second colour component estimated value corresponding to the current block by performing component prediction according to a second colour component corresponding to the current block.
11. The apparatus of claim 7 , wherein the processor is further configured to:
perform downsampling on the neighboring reference sample to determine part of reference samples based on a preset threshold.
12. The apparatus of claim 7 , wherein the neighboring reference sample comprises at least one of:
an upper reference sample of the current block,
an upper-left reference sample of the current block; or
a left reference sample of the current block.
13. A method for encoding a video, comprising:
determining a first colour component neighboring reference value, a second colour component neighboring reference value and a first colour component reconstructed value corresponding to a current block, wherein the first colour component neighboring reference value is indicative of a first colour component parameter corresponding to a neighboring reference sample of the current block, the second colour component neighboring reference value is indicative of a second colour component parameter corresponding to the neighboring reference sample of the current block, and the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block;
determining a second colour component predicted value corresponding to the current block at least based on a linear model corresponding to factors, wherein the factors are determined by at least one of a weight coefficient, the first colour component neighboring reference value, or the second colour component neighboring reference value; and
encoding the video based on the second colour component predicted value.
14. The method of claim 13 , further comprising:
determining the second colour component predicted value based on the linear model corresponding to the factors and the first colour component reconstructed value.
15. The method of claim 13 , wherein a position of the current block is indicative of a position correlation between the current block and the neighboring reference sample.
16. The method of claim 13 , further comprising:
determining a second colour component estimated value corresponding to the current block by performing component prediction according to a second colour component corresponding to the current block.
17. The method of claim 13 , further comprising:
performing downsampling on the neighboring reference sample to determine part of reference samples based on a preset threshold.
18. The method of claim 13 , wherein the neighboring reference sample comprises at least one of:
an upper reference sample of the current block,
an upper-left reference sample of the current block; or
a left reference sample of the current block.