Conversion of higher resolution images for display on a lower-resolution display device
US5528740A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1993 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Feb 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/395
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for converting a high-resolution bitonal bit map representation of a document to a lower-resolution pixel representation for display. A special subset of the high resolution output is assigned special meanings by codes which are used to produce a real time video signal with higher bandwidth to enhance the resolution and readability of the displayed image on a lower resolution display. This is accomplished by splitting each coded pixel into two or more "twixels". The twixels produced from pixels which are not part of the special subset have the same codes as the corresponding original pixels. The twixels produced from pixels which are part of the special subset have special codes which, when displayed, duplicate certain predetermined high resolution features of the original bitonal pixel-code information on a display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.