no code implementations • 21 Dec 2023 • Marvin Kahra, Michael Breuß, Andreas Kleefeld, Martin Welk
These are based on the construction of a supremum or infimum with respect to an order over the tonal range in a certain section of the image.
1 code implementation • 5 Jan 2022 • Elias Tappeiner, Martin Welk, Rainer Schubert
Both the patch-size and the loss function are parameters with direct influence on the class imbalance and their optimization leads to a 3\% increase of the Dice score and 22% reduction of the 95% Hausdorff distance compared to the baseline, finally reaching $0. 8\pm0. 15$ and $3. 17\pm1. 7$ mm for the segmentation of seven HAN organs using a single and simple neural network.
no code implementations • 31 Oct 2019 • Martin Welk
Having been studied since long by statisticians, multivariate median concepts found their way into the image processing literature in the course of the last decades, being used to construct robust and efficient denoising filters for multivariate images such as colour images but also matrix-valued images.
no code implementations • 8 Mar 2019 • Leif Bergerhoff, Marcelo Cárdenas, Joachim Weickert, Martin Welk
Furthermore, we establish a comprehensive theory for the time-continuous evolution and we show that stability carries over to a simple explicit time discretisation of our model.
no code implementations • 28 Dec 2015 • Martin Welk
In the present paper we focus on texture descriptors in which the graph indices are entropy-based, and use them in a geodesic active contour framework for image segmentation.
no code implementations • 27 Sep 2015 • Martin Welk
Multivariate median filters have been proposed as generalisations of the well-established median filter for grey-value images to multi-channel images.
no code implementations • 12 Nov 2014 • Martin Welk
Morphological amoebas are image-adaptive structuring elements for morphological and other local image filters introduced by Lerallut et al. Their construction is based on combining spatial distance with contrast information into an image-dependent metric.
no code implementations • 8 Oct 2013 • Martin Welk
In this paper, an iterative method for robust deconvolution with positivity constraints is discussed.
no code implementations • 30 Sep 2013 • Martin Welk
They achieve similar results as the well-known geodesic active contour and self-snakes PDEs.
no code implementations • 26 Apr 2013 • Martin Welk, Martin Erler
Both approaches are demonstrated in the context of Richardson-Lucy deconvolution but are not restricted to this method.