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Erschienen in:
2007 | OriginalPaper | Buchkapitel
Image Processing Algorithms for an Auto Focus System for Slit Lamp Microscopy
verfasst von : Christian Gierl, T. Kondo, H. Voos, W. Kongprawechon, S. Phoojaruenchanachai
Erschienen in: Advanced Concepts for Intelligent Vision Systems
Verlag: Springer Berlin Heidelberg
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The slit lamp microscope is the most popular opthalmologic instrument comprising a microscope with an light source attached to it. The coupling of microscope and light source distinguishes it from other optical devices. In this paper an Auto Focus system is proposed that considers this mechanical coupling and compensates for movements of the patient. It tracks the patient’s eye during the focusing process and applies a robust contrast-measurement algorithm to an area relative to it. The proposed method proved to be very accurate, reliable and stable, even starting from very defocused positions.