Coding method and apparatus therefor
US5655032A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1995 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Aug 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4172
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a method and apparatus for hierarchical coding of image data using a typical prediction TP if a 2.times.2 array of pixels can be reduced to coded pixel. The present invention uses a TP flag, TP discrimination and a two line delay. Accordingly, the hierarchical coding can be realized by a small amount of hardware. According to deterministic prediction DP, if there is a decision that the image data may be reduced then the value of the pixel can be predicted from a reduced pixel (low resolution data) and surrounding pixels (high resolution data) which are extracted in advance. If the pixel to be coded is one that can be uniquely determined this pixel is excluded form coding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.