Method and apparatus for reducing image distortion in an asynchronous input scanner
US5369504A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1992 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Apr 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/3294
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for reducing the distortion of image signals captured by an asynchronous scanning system during a transient period caused by temporarily disabling the scanning operation. Where in during normal operation, the asynchronous scanning system drives a document to be scanned relative to a scanning array which produces image signals representative of the document. Subsequently, the signals are transmitted to a host through an interface at a rate which may exceed the reception rate of the host, the asynchronous operation of the scanning system being regulated by start and stop signals which, respectively, enable and disable the scanning operation. The method used for reducing the image signal distortion during the transient period includes storing the image signals for the scanline acquired by the scanning array prior to disabling the scanning operation and storing at least one scanline of image signals for the scanlines acquired by the scanning array subsequent to restarting the scanning operation. Subsequently, the stored image signals are interpolated to generate additional scanlines of corrected image signals to replace those scanlines lost or those distorted whi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.