Digital document magnifier
US5586196A · kind A · utility
Inventor
Key dates
| Filing date | Jan 31, 1994 |
| Grant date | Dec 17, 1996 |
| Priority date | — |
| Expiry date | Jan 31, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T3/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital document magnifier for scanning and digitizing printed information, processing the information, and displaying the processed information on a display screen is provided. The digital document magnifier software analyzes the contents of a document and then automates presentation of the document to a viewer. The system includes a microprocessor for processing the scanned information, and displayable video memory for storing information to be displayed. The video memory is organized as a two-dimensional circular display buffer. The two-dimensional buffer is used to zoom incrementally an image to the display screen as necessary. The magnifier can provide either one data bit per pixel for a monochrome display, or four data bits per pixel for a color or greyscale display. Methods for scaling coordinates between a source image bitmap buffer and a two-dimensional circular display buffer also are provided. The methods include dynamically re-mapping page geometry to obtain continuous line effects and continuous column effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.