Adaptive transform coding using variable block size
US5241395A · kind A · utility
192Cited by
6References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Mar 23, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/96
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptive transform coding algorithm for a still image utilizes a quadtree based variable block size discrete cosine transform to achieve a better tradeoff between bit rate and image quality. The choice of appropriate block size is made according to a mean based decision rule which can discriminate various image contents for better visual quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.