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Specimens of carbon or glass fiber reinforced polymer (CFRP, GFRP) can be imaged using both conventional laboratory X-ray micro-computed tomography (µXCT) equipment and synchrotron light sources (µSCT). The image quality when using intense (partially) coherent synchrotron light is still superior, especially when applying phase-retrieval algorithms. In the(More)
One way of generating light weight composites is to insert porous ceramic grains into the melt of the matrix. The foam like inner structure of the grains causes a considerable weight reduction. On the other hand, it is desired that the mechanical properties of the matrix carry over to the composite. The properties of the composite depend both on the(More)
In this paper, a ceramic open foam is modelled using a two-step procedure. First, a random Laguerre tessellation is fitted to the edge system of the polyurethane foam forming the core of the ceramic foam. In a second phase, a model of the ceramic foam is obtained using dilations with balls of locally varying size. The model fitting is based on geometric(More)
The department MODELS AND ALGORITHMS IN IMAGE PROCESSING is primarily working on the following subjects: • surface inspection • signal analysis for railway systems • analysis of 3d microstructures • analysis of image and video sequences • cryptology Our main focus is the development of complex algorithms for image and signal processing, and their(More)
Quantile and median filters are usually implemented by accumulating a histogram in a mask with side length 2r + 1, and then selecting the desired quantile from the histogram. Fully updating the histogram for every pixel in a d-dimensional image leads to an O(r<sup>d</sup>) algorithm per pixel. Huang et al. proposed to shift the histogram pixel-by-pixel to(More)
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