Method for increasing bit number of digital image signals generated by a scanner
US6424748B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1999 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Apr 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a transforming method for increasing bit number of digital image signals generated by a scanner. The scanner comprises a scanning module having a plurality of linearly arranged sensors for scanning a document and generating a plurality of corresponding analog image signals, an A/D (analog to digital) converter for converting each of the analog image signals into a digital image signal with a first bit number, and a white calibration area and a black calibration area for calibrating the scanning module. The transforming method comprises: (1) using the scanning module to scan the white and black calibration areas, (2) generating a plurality of white and black analog image signals through scanning of the white and black calibration areas by each sensor of the scanning module, and generating a plurality of corresponding white and black digital image signals by converting the white and black analog image signals generated by each sensor through use of the A/D converter, and (3) converting each digital image signal generated during scanning of the document by each sensor into a digital image signal with a second bit number according to the white and black d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.