Selection of transform size in video coding
US9438915B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2015 |
| Grant date | Sep 6, 2016 |
| Priority date | — |
| Expiry date | Dec 21, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Blocks of a frame of a video stream can be encoded using various prediction modes followed by transforming the predicted blocks. Increasing coding efficiency may be achieved by indicating a default transform mode in a frame header. The default transform mode is a maximum transform size for all blocks of the frame or a per-block transform mode that determined the transform size on a per-block basis. For encoded blocks of the frame, identify a prediction mode is identified by inspecting a block header of a current encoded block, the block header of the current encoded block is inspected if the default transform mode is the per-block transform mode so as to identify a transform size for the current encoded block, and otherwise the transform size for the current encoded block is the maximum transform size, and the current encoded block is decoded using the prediction mode and the transform mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.