FIELD: image processing tools.
SUBSTANCE: set of downsampling filters is determined based on the chroma format information, wherein the chromaticity format information indicates the chroma format of the image to which the current block belongs. Downsamples are obtained from the reconstructed luminance samples in the luminance block of the current block and reference downsamples from the selected luminance reference samples of the luminance block using corresponding downsampling filters from the set of downsampling filters. One or more linear model coefficients are determined based on the reference downsamples and the chroma reference samples corresponding to the reference downsamples. Prediction samples of the chroma block corresponding to the luminance block are obtained based on the coefficients of the linear model and downsamples from the reconstructed luminance samples in the luminance block, wherein the selected reference luminance samples contain at least one of: adjacent luminance samples located above the luminance block and selected based on the L available chroma reference samples, or adjacent luminance samples remaining in the luminance block and selected based on the L available chroma reference samples.
EFFECT: improvement in intra-frame color prediction using intercomponent linear modelling.
25 cl, 10 tbl, 22 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD AND APPARATUS FOR AFFINE EXTERNAL PREDICTION OF CHROMA SUBUNITS | 2020 |
|
RU2816202C2 |
| SELECTION OF NEIGHBOURING SAMPLE FOR INTERNAL PREDICTION | 2020 |
|
RU2810900C2 |
| OBTAINING A PARAMETER FOR IN-FRAME PREDICTION | 2020 |
|
RU2777779C1 |
| CONTEXT-BASED INTERNAL PREDICTION | 2019 |
|
RU2806083C2 |
| ENCODER, DECODER AND RELATED METHODS FOR SUB-BLOCK PARTITION MODE | 2020 |
|
RU2811983C2 |
| ENCODER, DECODER AND CORRESPONDING METHODS FOR OBTAINING INTRA-FRAME COLOUR MODE | 2020 |
|
RU2817389C2 |
| METHOD AND DEVICE FOR CHROMATICITY BLOCK PREDICTION | 2019 |
|
RU2787713C2 |
| SYSTEMS AND METHODS FOR APPLYING DEBLOCKING FILTERS TO RECOVERED VIDEO DATA | 2019 |
|
RU2770650C1 |
| OPERATIONS OF REPEATED DIGITISATION AND VARIATION OF IMAGE SIZE FOR VIDEO CODING AND DECODING WITH ALTERNATING DEFINING POWER | 2011 |
|
RU2456761C1 |
| ENCODER, DECODER AND CORRESPONDING METHODS USING INTRA-FRAME BLOCK COPY MERGE LIST | 2020 |
|
RU2797574C2 |
