Method of effacing zipper image
US7012720B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Jan 14, 2002 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Jul 25, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/193
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of effacing zipper image, applicable to scan a document by a scanner with a stagger charge-coupled device. The nth (n is a positive integer) pixel obtained by scan on a scan line at which the zipper image is produced is subtracted by the (n+1)th pixel obtained by scan on the scan line. The absolute value of the result is then compared to a critical value. If the result is smaller than the critical value, the nth pixel is the nth pixel modified as the nth pixel after process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.