Scene adaptive temporal filtering
US9215355B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Sep 8, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/62
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Calculating a temporal filter values to filter video data for noise and ghosting artifacts. A sensor specific noise model may be derived using the video capture settings of the video source to estimate the noise variance for an image, and to determine the amount of the temporal filtering to be applied to a frame or pixel. The global motion and sensor specific noise model may be used to populate filter coefficient look-up tables based on the local motion and luma values of each pixel in the frame. The maximum absolute difference between frames may be used to estimate global motion between two frames such that filter strength may be reduced for frames exhibiting high global motion and increased for frames exhibiting low global motion. According to an embodiment, the increase in temporal filtering between frames may be capped to avoid sudden visible noise differences between frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.