Compressed quantized image-data transmission technique suitable for use in teleconferencing
US4663660A · kind A · utility
82Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1986 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Jun 20, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique for transmitting compressed quantized image-data from a transmitter to a receiver over a limited bandwidth communication channel employs temporal differential pulse code modulation incorporating pyramid image processing spectrum analyzers and synthesizers. This technique permits the selective elimination by data-compression of only those portions of the original image information which contribute least to the perception of image quality by a viewer of a synthesized display image at the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.