Adjusting the color, brightness, and tone scale of rendered digital images
US7046400B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2002 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Jul 6, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/407
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of processing a digital image to produce an enhanced digital image including receiving a source digital image; receiving a rendering tone scale function wherein the rendering tone scale function is a nonlinear function that has an absolute magnitude slope in the middle of the function domain that is greater than or equal to the absolute magnitude slope at either extreme of the function domain; and using the rendering tone scale function to calculate a de-rendering tone scale function. The method also includes receiving or calculating an adjustment tone scale function; combining the de-rendering, rendering, and adjustment tone scale functions to form an enhancement tone scale function; and using the enhancement tone scale function and the source digital image to produce an enhanced digital image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.