Depth from defocus and rapid autofocusing: a practical approach
Subbarao, M.
Wei, T.-C.
Dept. of Electr. Eng.. State Univ. of New York, Stony Brook, NY;
Abstract
A method for determining depth (range) from image defocus and
rapid autofocusing of a camera named DFD1F, is presented. It requires
only two images in theory, but three images in the present
implementation. DFD1F is based on computing only one-dimensional Fourier
coefficients as opposed to two-dimensional Fourier coefficients for a
related prior method, thus providing not only computational advantage
but also robustness in practical applications. DFD1F is independent of
the form of the modulation transfer function of the camera. DFD1F has
been successfully implemented and tested on an actual camera system
named SPARCS. SPARCS can determine the distance of an object placed in
front of it at any distance in the range of 0.5 m to infinity, and can
successfully focus the object by moving the lens with a root-mean-square
error of less than 6% in terms of lens position
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