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Van Doorn, F.A.P. (author), Gielen, M.A. (author), Stappers, P.J. (author)Co-research is a method that engages participants in contextual user research by giving them the role of researcher. This method aids to capture their input in the fuzzy front end of the design process. A previous study [5] showed that children can act as co- researchers to gather contextual knowledge. In that study 20 children aged 9-12...conference paper 2014
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Van Doorn, E.C. (author), Horvath, I. (author), Rusak, Z. (author)This paper presents a systematic approach towards the study of required situation awareness (RSA) in traffic management context. Current theories are not suitable to clearly define the RSA in complex man-machine interaction (MMI) contexts. Deficiencies of man-machine interaction are difficult to recognize and resolve. This paper analyzes: (i)...conference paper 2014
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Van Doorn, F.A.P. (author), Gielen, M.A. (author), Stappers, P.J. (author)The role of users in design is diversifying and increasing. Besides product evaluations and idea-generation sessions, users can collaborate in research that aims to find requirements for design by acting as researchers themselves. Earlier studies have addressed a variety of reasons why giving users the role of co-researcher makes sense: users...conference paper 2013
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Koenderink, J. (author), Wijntjes, M. (author), Van Doorn, A. (author)The “zograscope” is a “visual aid” (commonly known as “optical machine” in the 18th century) invented in the mid-18th century, and in general use until the early 20th century. It was intended to view single pictures (thus not stereographic pairs) with both eyes. The optics approximately eliminates the physiological cues (binocular disparity,...journal article 2013
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- Van Doorn, F.A.P. (author), Klapwijk, R. (author) conference paper 2013
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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
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- Verhoosel, J. (author), Roes, J. (author), Bruinenberg, J. (author), Van Doorn, L. (author), Janssen, P. (author), De Vries, M. (author), Van Oosterom, P. (author) report 2013
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Van Doorn, A.J. (author), Koenderink, J.J. (author), Leyssen, M.H.R. (author), Wagemans, J. (author)We study the effect of stylistic differences on the nature of pictorial spaces as they appear to an observer when looking into a picture. Four pictures chosen from diverse styles of depiction were studied by 2 different methods. Each method addresses pictorial depth but draws on a different bouquet of depth cues. We find that the depth...journal article 2012
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Koenderink, J.J. (author), Van Doorn, A.J. (author)“Pictorial space” is the mental structure that appears to be the scaffold for the visual awareness when looking “into” (as opposed to “at”) a picture. Its structure differs from the “visual space” that is the scaffold for the visual awareness when looking into the scene in front of the observer. The structure of pictorial space has been probed...journal article 2012
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Koenderink, J.J. (author), Richards, W. (author), Van Doorn, A.J. (author)Local space-time scrambling of optical data leads to violent jerks and dislocations. On masking these, visual awareness of the scene becomes cohesive, with dislocations discounted as amodally occluding foreground. Such cohesive space-time of awareness is technically illusory because ground truth is jumbled whereas awareness is coherent....journal article 2012
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Koenderink, J.J. (author), Richards, W. (author), Van Doorn, A.J. (author)We consider operations that change the size of images, either shrinks or blow-ups. Image processing offers numerous possibilities, put at everyone’s disposal with such computer programs as Adobe Photoshop. We consider a different class of operations, aimed at immediate visual awareness, rather than pixel arrays. We demonstrate cases of blow-ups...journal article 2012
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Pont, S.C. (author), Koenderink, J.J. (author), Van Doorn, A.J. (author), Wijntjes, M.W.A. (author), Te Pas, S.F. (author)We present a novel setup in which real objects made of different materials can be mixed optically. For the materials we chose mutually very different materials, which we assume to represent canonical modes. The appearance of 3D objects consisting of any material can be described as linear superposition of 3D objects of different canonical...conference paper 2012
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Van Doorn, A.J. (author), Koenderink, J.J. (author), Todd, J.T. (author), Wagemans, J. (author)Human observers group local shading patterns into global super-patterns that appear to be illuminated in some unitary fashion. Many years ago, this was noticed for the case of uniform, unidirectional illumination. Recently, we found that it also applies to convergent and divergent illumination flows, but that human observers are blind to...journal article 2012
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Koenderink, J.J. (author), Van Doorn, A.J. (author), Pont, S.C. (author)Shape from shading arose from artistic practice, and later experimental psychology, but its formal structure has only been established recently by computer vision. Some of its algorithms have led to useful applications. Psychology has reversely borrowed these formalisms in attempts to come to grips with shading as a depth cue. Results have been...journal article 2012
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Steenhuisen, B.M. (author), Veeneman, W.W. (author), Van Doorn, L. (author), Van Breen, H. (author)A publicly owned Dutch energy distribution system operator (DSO) interacts during local infrastructure projects with its direct stakeholders to maximize utility in the public interest. These projects are about replacing, relocating, removing or reconstructing parts of the gas and electricity networks. At the same time, this DSO is heavily...conference paper 2012
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Steenhuisen, B.M. (author), Veeneman, W.W. (author), Van Doorn, L. (author), Van Breen, H. (author)This paper reports on how a Dutch energy network distribution company interacts with stakeholders in the decision making and execution of infrastructure projects. A multitude of external stakeholders can be involved having many different roles (Moore & Khagram 2004). In the Netherlands, these stakeholders can be subdivided in those related to...conference paper 2012
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Pont, S.C. (author), Van Doorn, A.J. (author), Te Pas, S.F. (author), Wijntjes, M.W.A. (author), Koenderink, J.J. (author)We present a novel setup in which real objects made of two different materials can be mixed optically in a linearly weighted manner. We conducted a psychophysical experiment in which observers rated optical mixtures of the three combinations of glossy, matte, and velvety green birds. The observers rated the materials on four scales: matte-glossy...conference paper 2012
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Van Doorn, A.J. (author)De hernieuwde aandacht voor duurzaamheid, die ruim vijf jaar geleden is ingezet, begint te resulteren in een golf van hoogwaardige projecten. Daarbij ligt de nadruk vaak op bouwkundige maatregelen die de impact op het milieu minimaliseren. Dat veel duurzame ambities in de praktijk blijven steken in goede bedoelingen, komt echter niet door een...journal article 2011
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Van Doorn, A.J. (author), Wagemans, J. (author), De Ridder, H. (author), Koenderink, J.J. (author)A "picture" is a at object covered with pigments in a certain pattern. Human observers, when looking "into" a picture (photograph, painting, drawing, . . . say) often report to experience a three dimensional "pictorial space." This space is a mental entity, apparently triggered by so called pictorial cues. The latter are sub-structures of color...conference paper 2011
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Wagemans, J. (author), Van Doorn, A.J. (author), Koenderink, J.J. (author)In the physical environment familiar size is an effective depth cue because the distance from the eye to an object equals the ratio of its physical size to its angular extent in the visual field. Such simple geometrical relations do not apply to pictorial space, since the eye itself is not in pictorial space, and consequently the notion ...journal article 2011