Thomas Luhmann

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The paper gives an overview of thermal imaging sensors for photogrammetric close-range applications. In particular, it presents results of the geometric calibration of thermographic cameras as they are used for building inspection and material testing. Two different test fields have been designed providing point targets that are visible in the thermal(More)
The paper describes the acquisition and rectification of high-resolution images of a valuable stone mosaic in the city of Oldenburg. The piece of art is located on an outer wall of a school building, hence image recording had to be done under daylight conditions. We have used a 16 mega-pixel camera Kodak DCS 645M for the acquisition of nine overlapping(More)
The paper presents a historical review of panorama image techniques with special emphasis on photogrammetric applications. The first part of the paper deals with the anatomic and visual properties of human vision where the use of panoramic views is evident for monitoring the environment, recognition, avoidance of collision etc. Naturally, the use of(More)
The following paper is a summary and comparison of different optical measuring systems for free-form surface measurement according to their achieved accuracy. The investigation includes three fringe projection systems, two stereo image-based matching methods and one object-based multi-image matching method. The accuracy is assessed by use of a 3D surface(More)
The paper reports on the development of a new guideline for acceptance and verification of optical 3-D measuring system, e.g. photogrammetric systems or fringe-projection systems. The work has started in 1996, initiated by the working group " Close-range Photogrammetry " of the German Society for Photogrammetry and Remote Sensing (DGPF) and by the working(More)
The application of perspective camera systems in photogrammetry and computer vision is state of the art. In recent years non-perspective and especially omnidirec-tional camera systems have increasingly been used in close-range photogrammetry tasks. In general, the perspective camera model, i. e. pinhole model, cannot be applied when using non-perspective(More)