Adjusting the contrast of a digital image with an adaptive recursive filter
US6728416B1 · kind B1 · utility
39Cited by
13References
9Claims
0Family size
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Key dates
| Filing date | Dec 8, 1999 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Dec 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and structure for adjusting the contrast of a digital image includes inputting an image, dividing the image into a pedestal signal and a texture signal, applying a tone scale function to the pedestal signal to produce a modified pedestal signal, and adding the texture signal to the modified pedestal signal to produce a processed digital image channel. The dividing filters a pixel of the image using weighting that is dependent upon coefficients of neighboring pixels adjacent the pixel. The filtering blurs the pedestal signal such that flat areas of the image are blurred more that discontinuities in the image.
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