Device and method for estimating defocus blur size in an image
US8068688B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 2009 |
| Grant date | Nov 29, 2011 |
| Priority date | — |
| Expiry date | Feb 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20008
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for estimating a defocus blur size (520) in a defocused blurred input image (14) includes the steps of removing at least a portion of any content correlation (464) from the input image (14) to generate a decorrelated image, and computing an autocorrelation matrix (570) from the decorrelated image. Subsequently, the method can include the steps of rotating the autocorrelation matrix (468) to a plurality of alternative angles to generate a plurality of rotated matrixes, and averaging the plurality of rotated matrixes (470) to calculate an averaged autocorrelation matrix (572). Next, the defocus blur kernel size (520) can be estimated from the averaged autocorrelation matrix (572). Additionally, the method can include the step of deblurring the input image (14) using the defocus blur size (520) to provide an adjusted image (22).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.