Orthogonal IRT Imaging

Like in visual photography the images of infrared-thermographic (IRT) measurements suffer distortion effects. In real measurements outside the laboratory quite often the point of view of the IRT camera is angular to the inspected surface. Thus a photogrammetric digital image processing of the results yielding deformation-true information is indispensable for a correct data interpretation and data use in mapping. Naturally for the montage of large true to scale image plans the rectified quality of all single images is a major requirement. With the help of newly developed optic-thermal markers an automatic image processing with marker matching and rectification of IRT image stacks can be realized. Active IRT is successfully used for damage investigations on mural paintings. But also for the investigation on building history and energetic inspection of buildings and monuments the non destructive and even contactless IRT evolved to a indispensable tool. However, those investigations happen on large objects and require several single IRT inquiries before the object is completely scanned in sufficient resolution. Actually developed software now enables seamless image conjunction of the IRT images by post-treatment and matching. Also, as e.g. in standard routine in active IRT, large image stacks have to be handled in parallel.