Method for preserving image detail when adjusting the contrast of a digital image
US6317521A · kind A · utility
62Cited by
5References
8Claims
0Family size
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Key dates
| Filing date | Sep 30, 1998 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Sep 30, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20012
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for preserving detail when adjusting tone scale of a digital image channel, the method comprises receiving a digital image channel; providing a tone scale function for adjusting the tone scale of the digital image channel; spatial filtering the digital image with a spatial filter which varies with location in the digital image channel according to the control signal producing a space-variant spatial filtered version of the digital image channel; using the tone scale function and the space-variant spatial filtered version of the digital image channel to produce an enhanced digital image channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.