A FLEXIBLE MULTI-MEDIA BUNDLE APPROACH

Multi-media photogrammetry has gained increased importance in many application fields over the last decades. Nowadays many measurement tasks have to be carried out under special conditions, where the light beam from an object to the imaging sensor passes different optical media. This paper describes the concept of a multi-media module and its integration into a bundle adjustment tool. The presented approach allows the simultaneous determination of refractive indices as well as the surface parameters of the interfaces. There is neither a restriction to the number of passed media nor the shape of the surfaces between them. Only a mathematical model of the surface has to be introduced. The contribution covers the basic concept as well as the algorithmic system. Special focus is given on the description of the implemented ray-tracing model. Further, the paper addresses strategies to decrease computational efforts and problems with extreme inclination angles between ray and interface. Finally, the multi-media bundle approach is tested in an experimental environment.