Non-linear image filter for filtering noise
US6108455A · kind A · utility
120Cited by
6References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 29, 1998 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | May 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for reducing noise using recursive noise level estimation. The system and method for noise reduction substitute a target pixel in a processing window with a weighted average of a plurality of neighboring pixels according to the degree of similarity between thc target pixel and the neighboring pixels. The similarity is based on the noise level affecting the image and the local brightness of the processing window. The filter is based on fuzzy logic and filters out noise without smoothing the image's fine details. The filter uses a human visual system (HVS) response to adjust brightness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.