Special case handling for merged chroma blocks in intra block copy prediction mode
US9591325B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2015 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Jul 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/593
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Innovations in intra block copy (“BC”) prediction facilitate handling of special cases when chroma blocks are merged for purposes of the intra BC prediction. For example, encoding includes intra BC prediction for a set of adjacent units (e.g., prediction units of a coding unit). An encoder derives a block vector (“BV”) value for secondary component blocks (e.g., chroma blocks) of the set of adjacent units using one or more of the BV values associated with the adjacent units. The encoding includes special case handling for any derived BV value referencing sample values outside a boundary (e.g., picture boundary, slice boundary, tile boundary). The special case handling can use constraints on values of the BVs, clipping of the derived BV value, or padding of sample values at the boundary. In some implementations, corresponding decoding includes special case handling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.