Fixed pattern noise reduction and high spatial frequency filtering using vari-focus lenses in low contrast scenes
US11611692B2 · kind B2 · utility
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Key dates
| Filing date | Nov 9, 2020 |
| Grant date | Mar 21, 2023 |
| Priority date | — |
| Expiry date | Feb 3, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20224
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for identifying and correcting fixed pattern noise includes capturing a focused image and an unfocused image via a variable focus lens. Fixed pattern noise represented in the unfocused image is filtered from the focused image. The unfocused image represents a low-pass filtered component of the focused image; subtracting the unfocused image from the focused image results in a high-pass and fixed pattern noise filtered focused image. Image capture and focus of the variable focus lens are synchronized to remove transitional frames from the image stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.