Image processing with minimization of ringing artifacts and noise
US7970230B2 · kind B2 · utility
4Cited by
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Key dates
| Filing date | Aug 1, 2007 |
| Grant date | Jun 28, 2011 |
| Priority date | — |
| Expiry date | Mar 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of reducing ringing artifacts in image data that has been filtered with a high frequency emphasis filter. For each filtered data value, a local variance is calculated from data values at neighboring filter taps. This variance is compared to a threshold, and if the threshold is exceeded, the filtered data value is limited between local minimum and maximum values. A method of reducing noise, also using the local variance, is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.