%0 Conference Paper
%1 INFRAR&D_2011
%A Soldan, Samuel
%A Rangel, Johannes
%A Kroll, Andreas
%B InfraR&D 2011 Proceedings Volume 6
%C Hannover, Germany
%D 2011
%K imported
%P 79-83
%T An Overview of Calibration Boards for the Geometric Calibration of
	Thermal Cameras
%U http://www.infrarottraining.de/infra/
%X In data fusion of imaging sources the knowledge about the intrinsic
	and extrinsic parameters of the camera is essential to avoid correspondence
	problems (i.e. matching up the corresponding points of two images
	acquired with some displacement disparity). A common way to determine
	these parameters is the use of a calibration board with known characteristics
	that is placed at different orientations in front of the camera.
	For normal cameras in the visible spectrum simple planar patterns
	in black and white color (like chessboards or dots in a grid arrangement)
	have been used as test fields with great success. For thermal cameras
	however these calibration targets don’t work due to the even thermal
	distribution. This poster is motivated by an inspection task in an
	unknown environment where the fusion of data from a thermography
	camera, a normal camera and a laser range finder is desired. The
	correspondence problem is stated and a structured overview of different
	calibration boards that have been used for geometric calibration
	of thermography cameras in literature is presented. All these solutions
	seem to be unnecessarily complicated for a one-time calibration.
	Therefore own ideas and experimental results with a simple and cheap
	calibration board that provides sufficient accuracy are provided.