Device and method for estimating defocus blur size in an image

Details Device and method for estimating defocus blur size in an image Device and method for estimating defocus blur size in an image

2009-02-02

2011-11-29

Mariam, Daniel (Department: 2624)

Image analysis

Image enhancement or restoration

Focus measuring or adjusting

Reexamination Certificate

active

08068688

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).

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International Search Report and Written Opinion for PCT/US2009/032825, publication date Mar. 16, 2009, Nikon Corporation.

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