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Catadioptric illumination device for capturing hemispherical illumination series

 
: Gruna, Robin

:
Fulltext urn:nbn:de:0011-n-2384884 (480 KByte PDF)
MD5 Fingerprint: 0e0e0e70721f6252133f708174c00b95
Created on: 25.4.2013


Beyerer, Jürgen (Hrsg.); Pak, Alexey (Hrsg.) ; Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung -IOSB-, Karlsruhe; Karlsruhe Institute of Technology -KIT-, Lehrstuhl für Interaktive Echtzeitsysteme -IES-:
Joint Workshop of Fraunhofer IOSB and Institute for Anthropomatics, Vision and Fusion Laboratory 2011. Proceedings : Triberg-Nussbach, Germany. From July, 17 to July, 22
Karlsruhe: KIT Scientific Publishing, 2012 (Karlsruher Schriften zur Anthropomatik 11)
ISBN: 978-3-86644-855-1
pp.81-90
Fraunhofer Institute of Optronics, System Technologies and Image Exploitation and Institute for Anthropomatics, Vision and Fusion Laboratory (Joint Workshop) <2011, Triberg-Nussbach>
English
Conference Paper, Electronic Publication
Fraunhofer IOSB ()

Abstract
The choice of an appropriate illumination design is one of the most important steps in creating successful machine vision systems for automated inspection tasks. In a widely used technique, inspection images are captured under angular-varying illumination directions over the hemisphere, which yields a set of images referred to as illumination series. However, these approaches are restricted in that they use rather simple illumination patterns like point- or sector-shaped illumination patterns on the hemisphere. In this report, we present a catadioptric illumination device that is able to illuminate small objects with arbitrary complex illumination patterns. To this end, we model and utilize a parabolic projection from the sphere to the plane, which allows to use an ordinary digital projector as computational light source. In order to be able to control the spectrum of the illumination, we also investigate the photometric properties of the utilized projector-camera system.

: http://publica.fraunhofer.de/documents/N-238488.html