Image enhancement method with simultaneous noise reduction, non-uniformity equalization, and contrast enhancement
US6757442B1 · kind B1 · utility
85Cited by
13References
20Claims
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Key dates
| Filing date | Nov 22, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Jun 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A technique is disclosed for enhancing discrete pixel images. Image enhancement is first performed by separating structural regions from non-structural regions and performing separate smoothing and sharpening functions on the two regions. Non-uniform equalization is then performed to reduce differences between high and low intensity values, while maintaining the overall appearance of light and dark regions of the reconstructed image. Contrast enhancement is then performed on the equalized values to bring out details by enhancing local contrast.
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