Method for contrast mapping of digital images using a variable mask
US6804409B2 · kind B2 · utility
8Cited by
5References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2001 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Dec 28, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4072
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for changing the dynamic range of an original input image to more closely match the dynamic range of the medium used for a reproduction. The method includes creating an output image by preserving small contrast differences between different areas of the original input image and limiting the maximum contrast differences between different areas of the original input image. The method also includes creating a mask by subtracting the original input image from the output image, scaling the mask, and creating a new output image by adding the scaled mask to the original input image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.