Directional video filters for locally adaptive spatial noise reduction
US7373013B2 · kind B2 · utility
19Cited by
37References
22Claims
0Family size
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Key dates
| Filing date | Dec 23, 2003 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Jan 27, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20012
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Spatial noise is reduced in an image having a plurality of pixels by detecting object boundaries and unstructured areas in the image and applying 3-tap high pass filters to each pixel in the image in at least four, but less than eight directions to determine the best direction for local low pass filtering. Low pass filtering is applied only along object boundaries and unstructured areas within the image so as to minimize the tendency to blur image edges. Using only four high pass filters to locate horizontal, vertical and diagonal image edges passing through the center of a 3×3 pixel array provides good results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.