Low bit rate video encoder using overlapping block motion compensation and zerotree wavelet coding
US5764805A · kind A · utility
165Cited by
9References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 23, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and a concomitant method for encoding video frame sequences (input images) using overlapping block motion compensation in conjunction with zerotree wavelet coding. The method partitions each input image into a plurality of overlapping blocks and applies wavelet transform on the partitioned input image. Various optional quantization processes can be selectively applied to determine an optimal quantizer scale for each wavelet coefficient. Zerotree coding is then optionally applied to selectively prune the wavelet coefficients. Finally, the quantized coefficients are encoded into a bitstream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.