Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Ledford, J.K.: The Slit Lamp Primer, Slack Incorporated, Thorofare, NJ (2006)
Boecker, W.: A fast autofocus unit for fluorescence microscopy. Phys. Med. Biol. 42, 1981–1992 (1992)
Subbarao, M., Choi, T., Nikzad, A.: Focusing techniques. J. Opt. Eng. 32, 2824–2836 (1993)
Yeo, T.T.E., Ong, S.H., Sinniah, J.R.: Autofocusing for tissue microscopy. Image and Vision Computing 11(10), 629–639 (1993)
Chun-Hung, S., Chen, H.H.: Robust Focus Measure for Low Contrast Images. Consumer Electronics, 2006. Digest of Technical Papers 24, 69–70 (2006)
Groen, F.C.A.: Comparison of Different Focus Functions for Use in Autofocus Algorithms. Cytometry 6, 81–91 (1985)
Yap, P.T., Raveendran, P.: Image focus measure based on Chebyshev moments. IEE Proc.-Vis. Image Signal Process 151(2), 128–136 (2004)
Park, Y., et al.: A Fast Circular Edge Detector for the Iris Region Segmentation. In: Bülthoff, H.H., Poggio, T.A., Lee, S.-W. (eds.) BMCV 2000. LNCS, vol. 1811, pp. 417–423. Springer, Heidelberg (2000)
Wildes, R.P.: Iris recognition: an emerging biometric technology. Proc. IEEE 85(9), 1348–1363 (1997)
Park, K.R., Kim, J.: A Real-Time Focusing Algorithm for Iris Recognition Camera. SMC-C 35(3), 441–444 (2005)
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 2007 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Gierl, C., Kondo, T., Voos, H., Kongprawechon, W., Phoojaruenchanachai, S. (2007). Image Processing Algorithms for an Auto Focus System for Slit Lamp Microscopy. In: Blanc-Talon, J., Philips, W., Popescu, D., Scheunders, P. (eds) Advanced Concepts for Intelligent Vision Systems. ACIVS 2007. Lecture Notes in Computer Science, vol 4678. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74607-2_83
Download citation
DOI: https://doi.org/10.1007/978-3-540-74607-2_83
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-74606-5
Online ISBN: 978-3-540-74607-2
eBook Packages: Computer ScienceComputer Science (R0)