2 papers
math.NA2018
The discrete cosine transform on triangles
Bastian Seifert, Knut Hüper
The discrete cosine transform is a valuable tool in analysis of data on undirected rectangular grids, like images. In this paper it is shown how one can define an analogue of the d…
math.DG2012
Averaging Complex Subspaces via a Karcher Mean Approach
Knut Hüper, Martin Kleinsteuber, Hao Shen
We propose a conjugate gradient type optimization technique for the computation of the Karcher mean on the set of complex linear subspaces of fixed dimension, modeled by the so-cal…