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 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, and wherein the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block; and
generating a second colour component predicted value corresponding to the current block at least based on a weight coefficient corresponding to the neighboring reference sample related to a position of the current block and the neighboring reference sample, wherein a scaling factor is determined by inputting the weight coefficient, the first colour component neighboring reference value and the second colour component neighboring reference value to a preset factor calculation model; 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 corresponding to the current block based on a linear model corresponding to the scaling factor.
3. The method of claim 2 , further comprising:
generating the second colour component predicted value based on the linear model corresponding to the scaling factor and the first colour component reconstructed value.
4. The method of claim 1 , wherein the position of the current block is indicative of a position correlation between the current block and the neighboring reference sample.
5. The method of claim 1 , further comprising:
acquiring a second colour component neighboring reference value corresponding to the current block, wherein the second colour component neighboring reference value is a second colour component parameter corresponding to the neighboring reference sample.
6. The method of claim 5 , 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.
7. 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.
8. 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.
9. 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 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, and wherein 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 weight coefficient corresponding to the neighboring reference sample related to a position of the current block and the neighboring reference sample; and
decode the current block at least based on the second colour component predicted value, wherein a scaling factor is determined by inputting the weight coefficient, the first colour component neighboring reference value and the second colour component neighboring reference value to a preset factor calculation model.
10. The apparatus of claim 9 , wherein the processor is further configured to:
generate the second colour component predicted value corresponding to the current block based on a linear model corresponding to the scaling factor.
11. The apparatus of claim 10 , wherein the processor is further configured to:
generate the second colour component predicted value based on the linear model corresponding to the scaling factor and the first colour component reconstructed value.
12. The apparatus of claim 9 , wherein the position of the current block is indicative of a position correlation between the current block and the neighboring reference sample.
13. The apparatus of claim 9 , wherein the processor is further configured to:
acquire a second colour component neighboring reference value corresponding to the current block, wherein the second colour component neighboring reference value is a second colour component parameter corresponding to the neighboring reference sample.
14. The apparatus of claim 13 , 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.
15. The apparatus of claim 9 , 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.
16. A method for encoding a video, comprising:
determining a first 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, and wherein the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block; and
determining a second colour component predicted value corresponding to the current block at least based on a weight coefficient corresponding to the neighboring reference sample related to a position of the current block and the neighboring reference sample; and
encoding the video at least based on the second colour component predicted value wherein a scaling factor is determined by inputting the weight coefficient, the first colour component neighboring reference value and the second colour component neighboring reference value to a preset factor calculation model.