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Optical Measurement of Depth Maps on Basis of Adaptively Generated Diffractive Gratings

Optical 3d measurement is getting more important in many fields of application. Todays optical 3d measurement methods of arbitrary textured objects are based on pattern projection. The patterns projected onto the surface are detected by sensors. For a confident evaluation a high contrast and therefore high luminace of the generated patterns is necessary.

In this research project new methods of depth map measurement based on laser projection are analysed. The research concentrates on measurement methods which work reliable in cases with critical circumstances like high ambient lighting. Recently available high resolution LCoS micro displays (Liquid Crystal on Silicon) with very high spatial resolution and high reflection coefficients are the key technology for this project. Using a monochromatic laser projection system based on a LCoS micro display as SLM (Spatial Light Modulator) the projection of many diffraction patterns with high intensity and good efficiency is possible. In this setup the micro display acts as a dynamic phase grating.

To obtain the depth maps the projected patterns are evaluated with methods of 3d image processing. A mutual adaption between adaptively generated diffrative grating and the related processing of the generated sensor data is the scientific challenge that is expected to reveal a new quality in depth map measurement.

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References

  • D. Lubeley:
    Dynamische Beugungsmuster für die optische Tiefenprofilbestimmung ,
    Angenommen zur Veröffentlichung: VDI-Fachtagung, Bildverarbeitung 2007, Regensburg, November 2007.

  • D. Lubeley:
    Unambiguous Dynamic Diffraction Patterns for 3D Depth Profile Measurement,
    Pattern Recognition - 29th DAGM Symposium, ISBN 978-3-540-74933-2, Springer Verlag, Heidelberg, pp. 42-51, 2007.

  • D. Lubeley:
    Laserprojektion auf Basis von Beugung - Bildwiedergabe und 3D-Erfassung,
    ITG-Fachbericht 199, Vorträge des 12. Dortmunder Fernsehseminars vom 20. bis 21. März 2007 in Dortmund, ISBN 978-3-8007-3019-3, VDE-Verlag, Berlin und Offenbach, pp. 197-200, 2007.

  • D. Lubeley, K. Jostschulte, R. Kays, K. Biskup, and B. Clasbrummel:
    Laser Pattern Based 3D Object Measurement System for Medical Applications,
    3rd European Medical & Biological Engineering Conference, ISSN 1727-1983, Prag, 2005.

  • D. Lubeley, K. Jostschulte, R. Kays, K. Biskup, and B. Clasbrummel:
    3D Wound Measurement System for Telemedical Applications,39th Annual Congress of the German Society for Biomedical Engineering, ISSN 0939-4990, Nürnberg, 2005.

  • D. Lubeley, K. Jostschulte, R. Kays, B. Clasbrummel:
    Mobile 3D-Wundvermessung für die Telemedizin,
    6. Würzburger Medizintechnik Kongress 9. - 11. Mai 2005, ISBN 3-937988-03-3, Fachverband Biomedizinische Technik e.V., Wetzlar, 2005.



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Contact

Prof. Dr.-Ing. Rüdiger Kays
Tel.: 0231 755-2100