Block motion video coding and decoding
US6188728A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Sep 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
During transform-based video compression processing, motion vectors, which are identified during motion estimation and then used during motion-compensated inter-frame differencing, are constrained to coincide with block boundaries in the reference data. Block-based motion vectors have components that correspond to integer multiples of block dimensions. For example, for (8.times.8) blocks, allowable motion vector components are ( . . . , -16, -8, 0, +8, +16, . . . ). Constraining motion vectors in this way enables the resulting encoded video bitstream to be further processed in the transform domain without having to apply inverse and forward transforms. In particular, an existing input bitstream is partially decoded to recover the motion vectors and prediction error (i.e., dequantized transform coefficients). Because the motion vectors coincide with block boundaries in the corresponding reference data, motion-compensated inter-frame addition can then performed in the transform domain to generate transform data for subsequent processing (which may ultimately involve re-encoding the transform data into another encoded video bitstream). Because motion compensation can be performed in t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.