Encoding video signals using multi-phase motion estimation
US5778190A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/415
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video signals are encoded using motion compensation based on motion vectors generated using multi-phase motion estimation. In a first phase, a first subset of video signals of each block is compared to the reference frame at locations corresponding to a first set of motion vectors. In a second phase, a second subset of video signals of each block is compared to the reference frame at locations corresponding to a second set of motion vectors, where the resolution of the first subset of video signals in the spatial domain is lower than the resolution of the second subset of video signals. In an alternative embodiment, in the first phase, each block is compared to the reference frame at locations corresponding to a first set of motion vectors. In the second phase, each block is compared to the reference frame at locations corresponding to a second set of motion vectors, where the second set of motion vectors is based on at least two best matches from the first phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.