@incollection {acker2008, title = {Inverse Problems and Parameter Identification in Image Processing}, year = {2008}, pages = {111--151}, publisher = {Springer}, abstract = {Many problems in imaging are actually inverse problems. One reason for this is that conditions and parameters of the physical processes underlying the actual image acquisition are usually not known. Examples for this are the inhomogeneities of the magnetic field in magnetic resonance imaging (MRI) leading to nonlinear deformations of the anatomic structures in the recorded images, material parameters in geological structures as unknown parameters for the simulation of seismic wave propagation with sparse measurement on the surface, or temporal changes in movie sequences given by intensity changes or moving image edges and resulting from deformation, growth and transport processes with unknown fluxes. The underlying physics is mathematically described in terms of variational problems or evolution processes. Hence, solutions of the forward problem are naturally described by partial differential equations. These forward models are reflected by the corresponding inverse problems as well. Beyond these concrete, direct modeling links to continuum mechanics abstract concepts from physical modeling are successfully picked up to solve general perceptual problems in imaging. Examples are visually intuitive methods to blend between images showing multiscale structures at different resolution or methods for the analysis of flow fields.}, doi = {10.1007/978-3-540-75632-3_4}, author = {Jens F. Acker and Benjamin Berkels and Kristian Bredies and Mamadou S. Diallo and Marc Droske and Christoph S. Garbe and Matthias Holschneider and Jaroslav Hron and Claudia Kondermann and Michail Kulesh and Peter Maass and Nadine Olischl{\"a}ger and Heinz-Otto Peitgen}, editor = {R. Dahlhaus and J. Kurths and Timmer, J. and Peter Maass} } @incollection {garbe_08_nonlinear, title = {Nonlinear Analysis of Multi-Dimensional Signals}, year = {2008}, note = {1}, pages = {231-288}, publisher = {Springer}, doi = {10.1007/978-3-540-75632-3_7}, author = {Christoph S. Garbe and Kai Krajsek and Pavel Pavlov and Bj{\"o}rn Andres and Matthias M{\"u}hlich and Ingo Stuke and Cicero Mota and Martin B{\"o}hme and Martin Haker and Schuchert, T. and Hanno Scharr and Til Aach and Erhardt Barth}, editor = {R. Dahlhaus and J. Kurths and Timmer, J. and Peter Maass} } @incollection {garbe2008, title = {Nonlinear analysis of multi-dimensional signals: local adaptive estimation of complex motion and orientation patterns}, year = {2008}, pages = {231-288}, publisher = {Springer}, abstract = {We consider the general task of accurately detecting and quantifying orientations in n-dimensional signals s. The main emphasis will be placed on the estimation of motion, which can be thought of as orientation in spatiotemporal signals. Associated problems such as the optimization of matched kernels for deriving isotropic and highly accurate gradients from the signals, optimal integration of local models, and local model selection will also be addressed.}, doi = {10.1007/978-3-540-75632-3_7}, author = {Christoph S. Garbe and Kai Krajsek and Pavel Pavlov and Bj{\"o}rn Andres and Matthias M{\"u}hlich and Ingo Stuke and Cicero Mota and Martin B{\"o}hme and Martin Haker and Tobias Schucher and Hanno Scharr and Til Aach and Erhardt Barth}, editor = {R. Dahlhaus and J. Kurths and Timmer, J. and Peter Maass} }