Crominance channel overshoot control in image enhancement
US6483941B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1999 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Sep 10, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20192
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for digital image processing are provided for controlling chrominance channel overshoot in response to FIR or other enhancement processing. The chrominance values defining the enhanced digital image data for each pixel are compared to corresponding local minimum and maximum chrominance values of the non-enhanced image obtained from the neighborhood of the subject pixel. If an enhanced chrominance value for a subject pixel falls outside the corresponding local minimum/local maximum chrominance range by an overshoot amount, the enhanced chrominance value is adjusted to reduce the overshoot amount. The overshoot amount is adjusted according to a pre-programmed overshoot reduction parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.