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Challenges of Position Coding with Thermal Patterns

Technical report


Sebastian Höfer


Technical report IES-2012-07. In: Jürgen Beyerer, Alexey Pak (eds.), Proceedings of the 2012 Joint Workshop of Fraunhofer IOSB and Institute for Anthropomatics, Vision and Fusion Laboratory, Karlsruher Schriften zur Anthropomatik, vol. 13, KIT Scientific Publishing, 2012.





Various surface inspection methods in computer vision rely on structured lighting techniques for position encoding. While these methods benefit from the rapid development in display technology and are well advanced in the visible spectrum, available technology is scarce outside the visible spectrum and narrows down to special applications. Choosing the right part of the spectrum for a computer vision task is a system design parameter which allows to emphasize or suppress specific optical properties of a material. This technical report will highlight the challenges of applying structured lighting techniques to the thermal infrared spectrum, which is primarily the creation of the appropriate patterns in this spectrum. Apart from the familiar effects in the visible spectrum, properties like self-emission, thermal diffusivity and differing optical characteristics have to be taken into consideration and demand for adaptations of the existing techniques.