Optimization of geometric models and development of calibration strategies for an all-reflective camera system
Project title
All-reflective optics for multispectral image acquisition in photogrammetric applications
Funding
German Research Foundation (DFG)
Motivation
Conventional refractive systems have a significant loss of image quality and geometric accuracy due to the chromatic aberration of lenses. This fact is important especially for photogrammetric applications that require imaging a wide spectral range. Those chromatic aberration problems can be completely avoided in all-reflective optical systems.
Aims and tasks
The aim of the project is the design and verification of an all-reflective multispectral high resolution wide-angle camera system for the application in photogrammetric measurement tasks at a high and at the highest level of accuracy. The all-reflective unobscured optical system with ultra precision optical components shall reach a new quality of reflective optics in this field.
- Design of an all-reflective unobscured multispectral high resolution wide-angle camera system for the application in photogrammetric measurement tasks at a high and at the highest level of accuracy
- Realization of a demonstration system
- Extension of the collinearity condition by a specific additional parameter set and a finite elements approach
- Development of calibration strategies for the reliable estimation of the model parameters
Results
At first we developed three demonstrators with different fixed focal lengths, each equipped with a RGB sensor. The large asymmetric geometric image distortion can be corrected with the developed geometric camera model. Based on these preliminary investigations we designed an all-reflective multispectral camera system and built up a prototype.
![Bild](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Prototyp/@@images/bfc1b344-162b-4474-8143-213bfc99447f.png)
© IPF
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Demonstrator/@@images/cd1ce084-f6fa-4787-8aac-dcaac0142272.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Beispielbilder/@@images/5b323b2e-0cb7-4cbe-884f-d8faf7557e01.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Beispielbild/@@images/391c449a-7584-4436-ba96-90dbca0e1d53.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Design1/@@images/c86a7631-3dd6-48ae-a02d-297d913bc7ce.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Design2/@@images/2430300f-cb0c-44a8-ad84-2d909b13e431.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Vollformatkamera/@@images/9cc68fdf-d801-4af1-adef-1af08fa62276.jpeg)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/OPZ-Demonstratoren/@@images/de96fc53-3d4c-49cd-9348-8217ddf3acb5.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/OPZ-Modell/@@images/d8722ea1-2f5b-416f-9033-b73e7bf04211.png)
![](https://tu-dresden.de/bu/umwelt/geo/ipf/photogrammetrie/ressourcen/bilder/forschung/projekte/reflective_optics/Modell-Prototyp/@@images/99020057-3e96-49ed-932a-96c651278f91.png)
Related Publications
Contact
- Prof. Dr. habil. H.-G. Maas (project management)
- Dipl.-Ing. Katja Richter, Dipl.-Ing. David Mader, Dr.-Ing. Kristof Seidl (project work)