Method and apparatus for contrast enhancement
US5467404A · kind A · utility
116Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1992 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Aug 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20064
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for enhancing the contrast of a digital image by PA0 a) decomposing said original image into a sequence of detail images or into an array of coefficients representing detail strength at multiple resolution levels and a residual image, PA0 b) modifying each pixel of each detail image or each detail coefficient according to at least one non-linear monotonically increasing odd conversion function, PA0 c) constructing said processed image by accumulating detail obtained from said modified detail images or from said detail coefficients, and further adding said residual image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.