Radially-based chroma noise reduction for cameras
US8274583B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2010 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Dec 23, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/134
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system, apparatus, computer readable medium, and method for radially-dependent noise reduction in image capturing devices involving an edge-preserving blur window are disclosed. In one embodiment, the edge-preserving blur includes only those pixels in the blur window that are within a threshold value of the blur window's current center pixel in its blurring calculation. By creating a threshold function that varies radially from the center of the image sensor's light intensity falloff function, a more appropriate threshold value can be chosen for each pixel, allowing for more noise farther from the center of the image, and allowing for less noise closer to the center of the image. Light-product information taken from the image's metadata may be used to scale the threshold value parameters dynamically. This allows the method to perform the appropriate amount of processing depending on the lighting situation of the image that is currently being processed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.