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- ItemStructural adaptive segmentation for statistical parametric mapping(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2010) Polzehl, Jörg; Voss, Henning U.; Tabelow, KarstenFunctional Magnetic Resonance Imaging inherently involves noisy measurements and a severe multiple test problem. Smoothing is usually used to reduce the effective number of multiple comparisons and to locally integrate the signal and hence increase the signal-to-noise ratio. Here, we provide a new structural adaptive segmentation algorithm (AS) that naturally combines the signal detection with noise reduction in one procedure. Moreover, the new method is closely related to a recently proposed structural adaptive smoothing algorithm and preserves shape and spatial extent of activation areas without blurring the borders.
- ItemStructural adaptive smoothing: principles and applications in imaging(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2009) Polzehl, Jörg; Tabelow, KarstenStructural adaptive smoothing provides a new concept of edge-preserving non-parametric smoothing methods. In imaging it employs qualitative assumption on the underlying homogeneity structure of the image. The chapter describes the main principles of the approach and discusses applications ranging from image denoising to the analysis of functional and diffusion weighted Magnetic Resonance experiments.