Active compensation of streaks using spatial filtering and feedback control
US7424169B2 · kind B2 · utility
11Cited by
5References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 15, 2003 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Nov 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing method to reduce streaking on a printed sheet uses a negative feedback system to reduce streaking. The method scans a printed sheet to produce image data. The method further measures gray-levels of the image data and computes a compensation vector from the measured gray-levels as the difference between a nominal tonal-resproduction-curve and local tonal-reproduction-curves. The compensation vector is applied the image data to be printed. The compensation vector emphasizes ranges of frequencies sensitive of the human eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.