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Vieth, A. (author), Kroes, Thomas (author), Thijssen, Julian (author), Lew, Baldur van (author), Eggermont, Jeroen (author), Basu, Soumyadeep (author), Eisemann, E. (author), Vilanova, Anna (author), Höllt, T. (author), Lelieveldt, B.P.F. (author)Exploration and analysis of high-dimensional data are important tasks in many fields that produce large and complex data, like the financial sector, systems biology, or cultural heritage. Tailor-made visual analytics software is developed for each specific application, limiting their applicability in other fields. However, as diverse as these...journal article 2024
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Vieth, A. (author), Lelieveldt, B.P.F. (author), Eisemann, E. (author), Vilanova, Anna (author), Höllt, T. (author)High-dimensional images (i.e., with many attributes per pixel) are commonly acquired in many domains, such as geosciences or systems biology. The spatial and attribute information of such data are typically explored separately, e.g., by using coordinated views of an image representation and a low-dimensional embedding of the high-dimensional...conference paper 2023
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Molenaar, M.L. (author), Eisemann, E. (author)Sparse Voxel Directed Acyclic Graphs (SVDAGs) are an efficient solution for storing high-resolution voxel geometry. Recently, algorithms for the interactive modification of SVDAGs have been proposed that maintain the compressed geometric representation. Nevertheless, voxel attributes, such as colours, require an uncompressed storage, which...journal article 2023
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Wiersma, R.T. (author), Nasikun, A. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)We introduce a geometric multigrid method for solving linear systems arising from variational problems on surfaces in geometry processing, Gravo MG. Our scheme uses point clouds as a reduced representation of the levels of the multigrid hierarchy to achieve a fast hierarchy construction and to extend the applicability of the method from triangle...conference paper 2023
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van de Ruit, M. (author), Eisemann, E. (author)Spectral rendering is a crucial solution for photorealistic rendering. However, most available texture assets are RGB-only, and access to spectral content is limited. Uplifting methods that recover full spectral representations from RGB inputs have therefore received much attention. Yet, most methods are deterministic, while, in reality,...conference paper 2023
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Matusovic, Marko (author), Parakkat, Amal Dev (author), Eisemann, E. (author)We introduce an approach for converting pixel art into high-quality vector images. While much progress has been made on automatic conversion, there is an inherent ambiguity in pixel art, which can lead to a mismatch with the artist's original intent. Further, there is room for incorporating aesthetic preferences during the conversion. In...journal article 2023
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Yu, C. (author), Wijntjes, M.W.A. (author), Eisemann, E. (author), Pont, S.C. (author)We present a method to capture the 7-dimensional light field structure, and translate it into perceptually-relevant information. Our spectral cubic illumination method quantifies objective correlates of perceptually relevant diffuse and directed light components, including their variations over time, space, in color and direction, and the...journal article 2023
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Väljataga, Terje (author), Pata, Kai (author), Annus, Andrea (author), Calisto, Michelle Andrade (author), Cambronero, Agueda Gomez (author), Eisemann, E. (author), Marroquim, Ricardo (author), Szécsi, László (author), Zaidi, A. (author)Disruptive technology has become an integral part of our lives, and it has brought about a significant transformation in the way we interact, communicate, and share information, also in the field of education. Innovation in technology needs to be based on ethics and values of the intended result. As the use of disruptive technology continues...conference paper 2023
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Solé Gómez, J.A. (author), Scandolo, L. (author), Eisemann, E. (author)Plastic pollution in the sea is an environmental hazard, negatively impacts marine life, and causes economic damage all over the world. It is estimated that each year 8 million tonnes of plastic are deposited in seas, the vast majority coming from rivers. In recent years, publicly available satellite imagery has been used to attempt to track...journal article 2022
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Wiersma, R.T. (author), Nasikun, A. (author), Eisemann, E. (author), Hildebrandt, K.A. (author)Learning from 3D point-cloud data has rapidly gained momentum, motivated by the success of deep learning on images and the increased availability of 3D~data. In this paper, we aim to construct anisotropic convolution layers that work directly on the surface derived from a point cloud. This is challenging because of the lack of a global...journal article 2022
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van der Toorn, J. (author), Wiersma, R.T. (author), Vandivere, Abbie (author), Marroquim, Ricardo (author), Eisemann, E. (author)Multimodal imaging is used by conservators and scientists to study the composition of paintings. To aid the combined analysis of these digitisations, such images must first be aligned. Rather than proposing a new domain-specific descriptor, we explore and evaluate how existing feature descriptors from related fields can improve the performance...conference paper 2022
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Coudert-Osmont, Yoann (author), Eisemann, E. (author), Marroquim, Ricardo (author)Perspective cues play an important role in painting analysis as it may unveil important characteristics about the painter's techniques and creation process. Nevertheless, extracting perspective lines and their corresponding vanishing points is usually a laborious manual task. Moreover, small variations in the lines may lead to large variations...conference paper 2022
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- Eisemann, E. (author), Zhang, Fang Lue (author) contribution to periodical 2022
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Popa, A. (author), Gabrieli, F. (author), Kroes, T. (author), Krekeler, A. (author), Alfeld, M.W.E.M. (author), Lelieveldt, B.P.F. (author), Eisemann, E. (author), Höllt, T. (author)Reflectance Imaging Spectroscopy (RIS) is a hyperspectral imaging technique used for investigating the molecular composition of materials. It can help identify pigments used in a painting, which are relevant information for art conservation and history. For every scanned pixel, a reflectance spectrum is obtained and domain experts look for pure...conference paper 2022
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Lin, Y. (author), Wiersma, R.T. (author), Pintea, S. (author), Hildebrandt, K.A. (author), Eisemann, E. (author), van Gemert, J.C. (author)Deep learning has improved vanishing point detection in images. Yet, deep networks require expensive annotated datasets trained on costly hardware and do not generalize to even slightly different domains, and minor problem variants. Here, we address these issues by injecting deep vanishing point detection networks with prior knowledge. This...conference paper 2022
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Pieras Sagardoy, M. (author), Marroquim, Ricardo (author), Broekens, D.J. (author), Eisemann, E. (author), Vilanova, A. (author)During training sessions, sailors rely on feedback provided by the coaches to reinforce their skills and improve their performance. Nowadays, the incorporation of sensors on the boats enables coaches to potentially provide more informed feedback to the sailors. A common exercise during practice sessions, consists of two boats of the same...journal article 2022
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Vieth, A. (author), Vilanova, A. (author), Lelieveldt, B.P.F. (author), Eisemann, E. (author), Höllt, T. (author)High-dimensional imaging is becoming increasingly relevant in many fields from astronomy and cultural heritage to systems biology. Visual exploration of such high-dimensional data is commonly facilitated by dimensionality reduction. However, common dimensionality reduction methods do not include spatial information present in images, such as...conference paper 2022
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Shi, P. (author), Billeter, M.J. (author), Eisemann, E. (author)Screen-space ambient occlusion (SSAO) shows high efficiency and is widely used in real-time 3D applications. However, using SSAO algorithms in stereo rendering can lead to inconsistencies due to the differences in the screen-space information captured by the left and right eye. This will affect the perception of the scene and may be a source...journal article 2022
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MačEk, Nejc (author), Usta, B. (author), Eisemann, E. (author), Marroquim, Ricardo (author)Video-streaming services usually feature post-processing effects to replace the background. However, these often yield inconsistent lighting. Machine-learning-based relighting methods can address this problem, but, at real-time rates, are restricted to a low resolution and can result in an unrealistic skin appearance. Physically-based...journal article 2022
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Yu, C. (author), Eisemann, E. (author), Pont, S.C. (author)Chromatic properties of the effective light in a space are hard to predict, measure and visualise. This is due to complex interactions between materials and illuminants. Here, we describe, measure and visualise the effects of inter-reflections on the structure of the physical light field for diffusely scattering scenes. The spectral...journal article 2022