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Di Cicco, F. (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)To understand the key image features that we use to infer the glossiness of materials, we analyzed the pictorial shortcuts used by 17th century painters to imitate the optical phenomenon of specular reflections when depicting grapes. Gloss perception of painted grapes was determined via a rating experiment. We computed the contrast, blurriness,...journal article 2019
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Elkhuizen, W.S. (author), Dore-Callewaert, T.W.J. (author), Leonhardt, Emilien (author), Vandivere, Abbie (author), Song, Y. (author), Pont, S.C. (author), Geraedts, Jo M.P. (author), Dik, J. (author)A seventeenth-century canvas painting is usually comprised of varnish and (translucent) paint layers on a substrate. A viewer’s perception of a work of art can be affected by changes in and damages to these layers. Crack formation in the multi-layered stratigraphy of the painting is visible in the surface topology. Furthermore, the impact of...journal article 2019
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Kartashova, T. (author), de Ridder, H. (author), te Pas, S. F. (author), Pont, S.C. (author)In this paper, we introduce a toolbox for the perceptually based visualization of light in a volume, focusing on the visual effects of illumination. First, our visualizations extend the conventional methods from a two-dimensional representation on surfaces to the whole volume of a scene. Second, we extend the conventional methods from showing...journal article 2019
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Kartashova, T. (author), de Ridder, H. (author), te Pas, S.F. (author), Pont, S.C. (author)In this article, we studied perception of a particular case of light fields that is characterized by a difference in its consistent structure between parts of a scene. In architectural lighting design, such a consistent structure in a part of a light field is called a light zone. First, we explored whether human observers are sensitive to...journal article 2018
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Zhang, F. (author), de Ridder, H. (author), Pont, S.C. (author)To better understand the interactions between material perception and light perception, we further developed our material probe MatMix 1.0 into MixIM 1.0, which allows optical mixing of canonical lighting modes. We selected three canonical lighting modes (ambient, focus, and brilliance) and created scenes to represent the three illuminations....journal article 2018
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Creusen, M.E.H. (author), Pont, S.C. (author), Schoormans, J.P.L. (author)This research is one of the first attempts to shed light on the influence of different lighting characteristics on consumer product perception. Study 1 looked at the influence of light level (i.e., brightness) and color temperature on consumer perception of a sneaker and a toaster. Study 2 assessed the influence of light diffuseness on consumer...poster 2017
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- Zhang, F. (author), de Ridder, H. (author), Barla, Pascal (author), Pont, S.C. (author) poster 2017
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Pont, S.C. (author), van Doorn, A.J. (author), Koenderink, J.J. (author)We studied whether human observers can estimate the illumination direction from 3D textures of random Brownian surfaces, containing undulations over a range of scales. The locally Lambertian surfaces were illuminated with a collimated beam from random directions. The surfaces had a uniform albedo and thus texture appeared only through shading...journal article 2017
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te Pas, S.F. (author), Pont, S.C. (author), Dalmaijer, ES (author), Hooge, ITC (author)Human observers are able to successfully infer direction and intensity of light from photographed scenes despite complex interactions between light, shape, and material. We investigate how well they are able to distinguish other low-level aspects of illumination, such as the diffuseness and the number of light sources. We use photographs of a...journal article 2017
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Schifferstein, Hendrik N.J. (author), Howell, BF (author), Pont, S.C. (author)The color of the background on which products are presented may affect their perceived attractiveness. We presented five different vegetables (tomato, carrot, yellow bell pepper, cucumber, eggplant) on four different background colors (orange or blue, either light or dark). Although the backgrounds did not affect the direct color perception...journal article 2017
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Xia, L. (author), Pont, S.C. (author), Heynderickx, I.E.J.R. (author)Humans are able to estimate light field properties in a scene in that they have expectations of the objects' appearance inside it. Previously, we probed such expectations in a real scene by asking whether a "probe object" fitted a real scene with regard to its lighting. But how well are observers able to interactively adjust the light...journal article 2017
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Hansmann-Roth, S. (author), Pont, S.C. (author), Mamassian, Pascal (author)The material property of glossiness, which is attributed to many objects in our daily life, is physically independent of the objects' color. However, perceived glossiness can change with the contrast between the highlight and the area around the specular highlight. Hitherto, experiments mainly investigated gloss on unicolored surfaces. It is...journal article 2017
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Bluyssen, P.M. (author), van Zeist, F. (author), Kurvers, S.R. (author), Tenpierik, M.J. (author), Pont, S.C. (author), Wolters, Bart (author), van Hulst, Luuk (author), Meertins, Darell (author)Research has shown that staying indoors is not good for our health. People spend more and more of their time indoors. Therefore, providing a healthy and comfortable indoor environment is very important. The SenseLab will contribute to the understanding of and coping with the indoor environment. Students, teachers, researchers, but also the...journal article 2017
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van Assen, Jan Jaap R. (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)Gloss perception strongly depends on the three-dimensional shape and the illumination of the object under consideration. In this study we investigated the influence of the spatial structure of the illumination on gloss perception. A diffuse light box in combination with differently shaped masks was used to produce a set of six simple and complex...journal article 2016
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Kartashova, T. (author), Sekulovski, D (author), de Ridder, H. (author), te Pas, SF (author), Pont, S.C. (author)Human observers have been demonstrated to be sensitive to the local (physical) light field, or more<br/>precisely, to the primary direction, intensity, and diffuseness of the light at a point in a space. In the<br/>present study we focused on the question of whether it is possible to reconstruct the global visual light field, based on observers’...journal article 2016
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Xia, L. (author), Pont, S.C. (author), Heynderickx, I.E.J.R. (author)The lighting and furnishing of an interior space (i.e., the reflectance of its materials, the geometries of the furnishings, and their arrangement) determine the appearance of this space. Conversely, human observers infer lighting properties from the space's appearance. We conducted two psychophysical experiments to investigate how the...journal article 2016
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Zhang, F. (author), de Ridder, H. (author), Fleming, Ronald W. (author), Pont, S.C. (author)MatMix 1.0 is a novel material probe we developed for quantitatively measuring visual perception of materials. We implemented optical mixing of four canonical scattering modes, represented by photographs, as the basis of the probe. In order to account for a wide range of materials, velvety and glittery (asperity and mesofacet scattering) were...journal article 2016
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Xia, L. (author), Pont, S.C. (author), Heynderickx, I.E.J.R. (author)Human observers’ ability to infer the light field in empty space is known as the “visual light field.” While most relevant studies were performed using images on computer screens, we investigate the visual light field in a real scene by using a novel experimental setup. A “probe” and a scene were mixed optically using a semitransparent mirror....journal article 2014
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Koepsell, D.R. (author), Brinkman, W.P. (author), Pont, S.C. (author)Human research ethics has developed in both theory and practice mostly from experiences in medical research. Human participants, however, are used in a much broader range of research than ethics committees oversee, including both basic and applied research at technical universities. Although mandated in the United States, the United Kingdom,...journal article 2014
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Nefs, H.T. (author), Van Bilsen, A. (author), Pont, S.C. (author), De Ridder, H. (author), Wijntjes, M.W.A. (author), Van Doorn, A.J. (author)In this paper, we focus on how people perceive the aspect ratio of city squares. Earlier research has focused on distance perception but not so much on the perceived aspect ratio of the surrounding space. Furthermore, those studies have focused on “open” spaces rather than urban areas enclosed by walls, houses and filled with people, cars, etc....journal article 2013