Scanned document image resolution enhancement
US5065149A · kind A · utility
9Cited by
18References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1989 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Nov 9, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/391
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for providing high resolution images for static display of document pages that are scanned in through a document scanner at high resolution, with reduced bandwidth requirements. In one embodiment, groups of four scanned image pixel values, each one bit in length, are reduced to a single two-bit pixel value that determines a pixel value for a display image pixel; and selected displayed image pixel values are periodically varied between the original displayed image pixel value and an alternative pixel value to restore the perception of high resolution available in the scanned image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.