18 May 2004 Real-time digital autofocusing using a priori estimated set of PSFs
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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, Sunghyun Hwang, Kiman Kim, Kiman Kim, Jeongho Shin, Jeongho Shin, Joonki Paik, Joonki Paik, Besma Abidi, Besma Abidi, Mongi Abidi, Mongi Abidi, } "Real-time digital autofocusing using a priori estimated set of PSFs", Proc. SPIE 5297, Real-Time Imaging VIII, (18 May 2004); doi: 10.1117/12.526683; https://doi.org/10.1117/12.526683

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