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Yu, C. (author), Van Zuijlen, Mitchell J.P. (author), Spoiala, C. (author), Pont, S.C. (author), Wijntjes, M.W.A. (author), Hurlbert, Anya (author)The spectral shape, irradiance, direction, and diffuseness of daylight vary regularly throughout the day. The variations in illumination and their effect on the light reflected from objects may in turn provide visual information as to the time of day. We suggest that artists' color choices for paintings of outdoor scenes might convey this...journal article 2024
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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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Louwers, G.L.M. (author), Ozcan Vieira, E. (author), Van Bommel, Jasper (author), Pont, S.C. (author)Psychological needs of users as a basis for design are at the core of design practice, yet the importance of fundamental human needs when designing soundscapes has not been studied specifically. This paper investigates the relationship between nine fundamental human needs and the affective qualities and categories of soundscapes. In a free...conference paper 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
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Yu, C. (author), Wijntjes, M.W.A. (author), Eisemann, E. (author), Pont, S.C. (author)In everyday scenes, the effective light (the actual light in a space) can be defined as a complex light field, resulting from a mixture of emissive light sources and indirect mutual surface (inter-)reflections. Hence, the light field typically consists of diffuse and directional illumination and varies in spectral irradiance as a function of...journal article 2022
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Groutars, E.G. (author), Risseeuw, C.C. (author), Ingham, Colin (author), Hamidjaja, Raditijo (author), Elkhuizen, W.S. (author), Pont, S.C. (author), Karana, E. (author)Flavobacteria, which can be found in marine environments, are able to grow in highly organized colonies producing vivid iridescent colorations. While much is known about the biology of these organisms, their design potential as responsive media in user interfaces has not been explored. Our paper aims at bridging this gap by providing insights...conference paper 2022
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Barati, B. (author), Karana, E. (author), Pont, S.C. (author), van Dortmont, T. (author)This paper aims to provide first insights into flash characteristics of bioluminescent microalgae as a potential media for future living light interfaces. A growing number of HCI and interaction design researchers show interest in living material interfaces, which incorporate living organisms for novel responsive behaviour and interaction...conference paper 2021
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Di Cicco, F. (author), Zhao, Y. (author), Wijntjes, M.W.A. (author), Pont, S.C. (author), Schifferstein, Hendrik N.J. (author)Food appearance sets intentions and expectations. When designing packaged food much attention is devoted to packaging elements like color and shape, but less to the characteristics of the images used. To our awareness, no study has yet investigated how the appearance of the food shown on the package affects consumers’ preferences. Often, orange...journal article 2021
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Lin, Hubert (author), van Zuijlen, M.J.P. (author), Pont, S.C. (author), Wijntjes, M.W.A. (author), Bala, Kavita (author)A common strategy for improving model robustness is through data augmentations. Data augmentations encourage models to learn desired invariances, such as invariance to horizontal flipping or small changes in color. Recent work has shown that arbitrary style transfer can be used as a form of data augmentation to encourage invariance to textures...conference paper 2021
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Di Cicco, F. (author), van Zuijlen, M.J.P. (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)Dutch 17th century painters were masters in depicting materials and their properties in a convincing way. Here, we studied the perception of the material signatures and key image features of different depicted fabrics, like satin and velvet. We also tested whether the perception of fabrics depicted in paintings related to local or global cues,...journal article 2021
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van Zuijlen, M.J.P. (author), Lin, Hubert (author), Bala, Kavita (author), Pont, S.C. (author), Wijntjes, M.W.A. (author)In this paper, we capture and explore the painterly depictions of materials to enable the study of depiction and perception of materials through the artists’ eye. We annotated a dataset of 19k paintings with 200k+ bounding boxes from which polygon segments were automatically extracted. Each bounding box was assigned a coarse material label (e...journal article 2021
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Yu, C. (author), Pont, S.C. (author)In natural scenes, the wavelength-dependent sunlight scattering in the atmosphere and the presence of occluders and mutual reflections cause variations in the local illumination's magnitude, direction, and spectral composition as a function of time and space. Yet, unlike the characterization of temporal changes of natural light, these spatial...conference paper 2021
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Yu, C. (author), Pont, S.C. (author)In complex scenes, the light reflected by surfaces causes secondary illumination, which contributes significantly to the actual light in the space (the "light field"). Secondary illumination is dependent on the primary illumination, geometry, and materials of a space. Hence, primary illumination and secondary illumination can have non-identical...conference paper 2020
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van Zuijlen, M.J.P. (author), Pont, S.C. (author), Wijntjes, M.W.A. (author)Painters are masters of depiction and have learned to evoke a clear perception of materials and material attributes in a natural, three-dimensional setting, with complex lighting conditions. Furthermore, painters are not constrained by reality, meaning that they could paint materials without exactly following the laws of nature, while still...journal article 2020
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Di Cicco, F. (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)Citrus fruits are characterized by a juicy and translucent interior, important properties that drive material recognition and food acceptance. Yet, a thorough understanding of their visual perception is still missing. Using citrus fruits depicted in 17th-century paintings as stimuli, we ran three rating experiments. In Experiment 1,...journal article 2020
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Di Cicco, F. (author), Wiersma, Lisa (author), Wijntjes, M.W.A. (author), Pont, S.C. (author)Painters mastered replicating the regularities of the visual patterns that we use to infer different materials and their properties, via meticulous observation of the way light reveals the world's textures. The convincing depiction of bunches of grapes is particularly interesting. A convincing portrayal of grapes requires a balanced...journal article 2020
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Zhang, F. (author), de Ridder, H. (author), Barla, Pascal (author), Pont, S.C. (author)We previously presented a systematic optics-based canonical approach to test material-lighting interactions in their full natural ecology, combining canonical material and lighting modes. Analyzing the power of the spherical harmonics components of the lighting allowed us to predict the lighting effects on material perception for generic...journal article 2020
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Driller, K.K. (author), Frier, William (author), Pont, S.C. (author), Hartcher-O'Brien, J. (author)It is known that the duration of a short stimulus affects the perceived intensity of both visual, auditory, and, vibrotactile events, but it is still unclear whether such a relationship also exists for mid-air ultrasonic inputs to the hand. Here we investigate this issue and show how the perceived intensity of focused ultrasonic stimulations of...conference paper 2019
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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