Directional discrete wavelet transform (DDWT) for video compression applications
US8705619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2010 |
| Grant date | Apr 22, 2014 |
| Priority date | — |
| Expiry date | Nov 18, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/42
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for encoding video using directional discrete waveform transforms (DDWT), such as within a codec device. DDWT can be utilized to replace the use of intra transforms and inter transforms within the encoding system. In many ways the output of the DDWT can be compared with that provided using MDDT, however, it does not require a training process while it also provides enhanced encoding of feature edges with desirable visual characteristics. The transforms are applied in at least two passes, along the prediction direction, and then across the prediction direction, instead of being applied in fixed vertical and horizontal directions. Directional scaling is not required prior to the second stage of transforms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.