Defocus estimation method independent of the scene content and use in an autofocus system
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United States of America Patent
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Feb 27, 2018
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Aug 24, 2015
filing date -
Dec 17, 2014
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Abstract
A method of adjusting a lens may include adjusting the lens at a first focus position, and acquiring a first image of a scene through the lens. The method may further include adjusting the lens at a second focus position, and acquiring a second image of the same scene through the lens. In addition, the method may include producing respective power spectra of the first and second images, and producing a criterion representing the ratio of the power spectra to estimate a focus error of the lens.
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