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18 May 2004 Real-time digital autofocusing using a priori estimated set of PSFs
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Proceedings Volume 5297, Real-Time Imaging VIII; (2004)
Event: Electronic Imaging 2004, 2004, San Jose, California, United States
This paper proposes a real-time digital auto-focusing algorithm using a priori estimated set of point spread functions (PSFs). A priori set of PSFs are estimated by establishing the relation between two-dimensional PSF and onedimensional step response whose elements are samples of profile of degraded step edge. From the priori estimated set, the proposed auto-focusing algorithm can select the optimal PSF by the focusing criterion based on the frequency domain analysis. We then use the constrained least square (CLS) filter to obtain the in-focused image with the estimated optimal PSF. The proposed algorithm can be implemented in real-time because the set of PSFs are already estimated and the filtering is performed in the frequency domain.
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Sunghyun Hwang, Kiman Kim, Jeongho Shin, Joonki Paik, Besma Abidi, and Mongi Abidi "Real-time digital autofocusing using a priori estimated set of PSFs", Proc. SPIE 5297, Real-Time Imaging VIII, (18 May 2004);

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