Sample sets and new down-sampling schemes for linear component sample prediction
US10939117B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2018 |
| Grant date | Mar 2, 2021 |
| Priority date | — |
| Expiry date | Sep 28, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosure regards cross-component prediction and methods for obtaining a chroma sample from an associated luma sample using a linear model with parameters. The parameters are derived from luma and chroma samples neighbouring the luma and chroma blocks considered. The luma samples are down-sampled to match chroma resolution. A competition between several luma down-sampling schemes is proposed wherein two 1-tap filters are competing. This reduces computational complexity at the encoder. Also a competition between several sample sets defining the neighbouring luma and chroma samples used for parameter derivation is conducted, wherein a competing sample set is an irregular sample set. The irregular sample set preferably comprises only samples from second lines next to respective first lines of outer neighbouring samples parallel and immediately adjacent to respectively the left boundary and the top boundary of the current block. This improves chroma prediction and thus coding efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.