Method for selecting transform types from mapping table for prediction modes
US8929455B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2011 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Sep 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method codes pictures in a bitstream, wherein the bitstream includes coded pictures to obtain data for associated TUs and data for generating a transform tree, and a partitioning of coding units (CUs) into Prediction Units (PUs), and data for obtaining prediction modes or directions associated with each PU. One or more mapping tables are defined, wherein each row of each table has an associated index and a first set of transform types to be used for applying an inverse transformation to the data in TU. The first set of transform types is selected according to an index, and then a second set of transform types is applied as the inverse transformation to the data, wherein the second set of transform types is determined according to the first set of transform types and a transform-toggle flag (ttf) to obtain a reconstructed prediction residual.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.