Searched for: author%3A%22van+Leeuwen%2C+Tristan%22
(1 - 7 of 7)
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Graas, Adriaan B.M. (author), Wagner, E.C. (author), van Leeuwen, Tristan (author), van Ommen, J.R. (author), Batenburg, K. Joost (author), Lucka, Felix (author), Portela, L. (author)
A new X-ray computed tomography technique for the purpose of imaging fluidized beds is presented. It consists of an experimental set-up with three stationary X-ray source and flat panel detector pairs, a geometric calibration and data processing workflow, and an image reconstruction algorithm. The technique enables sparse-angular tomographic...
journal article 2024
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Seifert, Jacob (author), Shao, Y. (author), van Dam, Rens (author), Bouchet, Dorian (author), van Leeuwen, Tristan (author), Mosk, Allard P. (author)
Optical measurements often exhibit mixed Poisson–Gaussian noise statistics, which hampers the image quality, particularly under low signal-to-noise ratio (SNR) conditions. Computational imaging falls short in such situations when solely Poissonian noise statistics are assumed. In response to this challenge, we define a loss function that...
journal article 2023
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de Groot, Lennart V. (author), Fabian, Karl (author), Béguin, Annemarieke (author), Kosters, Martha E. (author), Cortés-Ortuño, David (author), Fu, Roger R. (author), Jansen, Chloë M.L. (author), Harrison, Richard J. (author), van Leeuwen, Tristan (author), Barnhoorn, A. (author)
Our understanding of the past behavior of the geomagnetic field arises from magnetic signals stored in geological materials, e.g., (volcanic) rocks. Bulk rock samples, however, often contain magnetic grains that differ in chemistry, size, and shape; some of them record the Earth's magnetic field well, others are unreliable. The presence of a...
journal article 2021
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Kadu, Ajinkya (author), van Leeuwen, Tristan (author), Mulder, W.A. (author)
Seismic full-waveform inversion tries to estimate subsurface medium parameters from seismic data. Areas with subsurface salt bodies are of particular interest because they often have hydrocarbon reservoirs on their sides or underneath. Accurate reconstruction of their geometry is a challenge for current techniques. This paper presents a...
journal article 2017
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Trull, A.K. (author), van der Horst, J. (author), Palenstijn, W.J. (author), van Vliet, L.J. (author), van Leeuwen, Tristan (author), Kalkman, J. (author)
As a result of the shallow depth of focus of the optical imaging system, the use of standard filtered back projection in optical projection tomography causes space-variant tangential blurring that increases with the distance to the rotation axis. We present a novel optical tomographic image reconstruction technique that incorporates the point...
journal article 2017
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Kadu, Ajinkya (author), Mulder, W.A. (author), van Leeuwen, Tristan (author)
Full-waveform inversion attempts to estimate a high-resolution model of the Earth by inverting all the seismic data. This procedure fails if the Earth model contains high-contrast bodies such as salt and if su ciently low frequencies are absent from the data. Salt bodies are important for hydrocarbon exploration because oil or gas reservoirs are...
conference paper 2017
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Kadu, Ajinkya (author), van Leeuwen, Tristan (author), Mulder, W.A. (author)
<br/>In seismic exploration, the delineation of large bodies with hard exterior contrasts but nearly constant interior properties is a challenge. Examples include salt diapirs, salt slabs, anhydrite or basalt layers. Salt geometries are of particular interest because they often have hydrocarbon reservoirs on their sides or underneath. This...
conference paper 2016
Searched for: author%3A%22van+Leeuwen%2C+Tristan%22
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