Method of compressing image signals
US4776029A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1987 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Apr 20, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of compressing image signals comprises the step of dividing the image signals into main signals sampled at appropriate intervals and interpolation signals other than the main signals. As for said main signals, prediction encoding compression processing is carried out between the main signals. As for the interpolation signals, prediction encoding compression processing is carried out based on the main signals. At least for the interpolation signals, quantization processing for making the bit resolution coarse is carried out in the course of encoding. The quantization processing of the interpolation signals is carried out for making the bit resolution coarser than the bit resolution of the main signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.