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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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Li, J. (author), Vermeeren, A.P.O.S. (author), De Ridder, H. (author)In this article, we present examples of using designerly ways to explore “crowd” phenomenon in a cross-disciplinary project named EWiDS. The phrase ‘designerly ways’ refers to visual communication methods such as drawings and videos, which are widely acknowledged as effective approaches to crossdisciplinary collaboration. This study started with...journal article 2014
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Wijntjes, M.W.A. (author), De Ridder, H. (author)Whereas the 17th century painter Canaletto was a master in linear perspective of the architectural elements, he seems to have had considerable difficulty with linear perspective of shadows. A common trick to avoid shadow perspective problems is to set the (solar) illumination direction parallel to the projection screen. We investigated in one...conference paper 2014
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Van Egmond, R. (author), De Ridder, H. (author), Pappas, T.N. (author), Silva, P.M. (author)We investigate the effect of contrast enhancement on the subjective roughness of visual textures. Our analysis is based on subjective experiments with seventeen images from the CUReT database in three variants: original, synthesized textures, and contrast-enhanced synthesized textures. In Experiment 1, participants were asked to adjust the...conference paper 2014
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Li, J. (author), de Ridder, H. (author), Vermeeren, A.P.O.S. (author), Conrado, C. (author), Martella, C. (author)This paper introduces the concept of crowd well-being and the needs for sustaining it. Crowd well-being can be interpreted as crowd members’ evaluations on their emotional reactions, moods and judgments they form about their satisfactions, goals or needs fulfillment in a crowded situation according to the definition of subjective well-being by...conference paper 2013
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Li, J. (author), Erkin, Z. (author), De Ridder, H. (author), Vermeeren, A.P.O.S. (author)Crowd experience is inevitable in daily life. Crowd managers need tools to accurately estimate the psychological aspects of crowds, an important one being crowd emotion. In this study, we explore the feasibility of obtaining a real-time, dynamic map of crowd emotions through self-reporting by crowd members. To this end, a smart phone application...conference paper 2013
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Jansen, R.J. (author), Van Egmond, R. (author), De Ridder, H. (author), Silvester, S. (author)Operational police work can be characterized by the continuous switching between surveillance, responding to incidents, and office activities. Transitions between these activities are initiated by radio contact, messages on a mobile data terminal, or personal observations. The “information environment” emerging from these channels may cause...conference paper 2013
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Li, J. (author), De Ridder, H. (author), Vermeeren, A.P.O.S. (author), Conrado, C. (author), Martella, C. (author)This paper investigates the needs or criteria for sustaining well-being in crowded situations through two focus group discussions with a total of ten participants. We conclude that pursuing crowd well-being could be divided into two different cases: one is obtaining the enhancement of the current state in normal situations, and the other is...conference paper 2013
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Melles, M. (author), Freudenthal, A. (author), De Ridder, H. (author)Medical staff should not only possess excellent clinical skills, but also be proficient in non-clinical, or non-technical, skills. These skills play an important role in, for example, teamwork, task management and coping. Our research investigates how product design can help support medical staff in their day-to-day non-clinical tasks. In the...journal article 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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Jansen, R.J. (author), Van Egmond, R. (author), De Ridder, H. (author)The use of sound was explored as means for expressing perceptual attributes of visual textures. Two sets of 17 visual textures were prepared: one set taken from the CUReT database1, and one set synthesized to replicate the former set. Participants were instructed to match a sound texture with a visual texture displayed onscreen. A modified...book chapter 2012
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Leendertse, W. (author), Arts, J. (author), De Ridder, H. (author)The core business of governmental organizations like Rijkswaterstaat in the Netherlands is the optimal management of road-end waterway networks. The coming years many maintenance, renewal and extension projects will be executed in these networks. Projects give a disturbance in functionality of the network. Network management is to keep this...journal article 2012
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De Ridder, H. (author), Pont, S.C. (author)In the past decades perceptual (or perceived) image quality has been one of the most important criteria for evaluating digitally processed image and video content. With the growing popularity of new media like stereoscopic displays there is a tendency to replace image quality with viewing experience as the ultimate criterion. Adopting such a...conference paper 2012
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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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Van Nederveen, G.A. (author), Soons, F.A.M. (author), Suddle, S.I. (author), De Ridder, H. (author)In faculties such as Civil Engineering, design is a not a core activity. Core activities at Civil Engineering are structural engineering, structural analysis, mechanics, fluid dynamics, etc. Design education has a relatively small share in the curriculum, compared to faculties such as Industrial Design or Architecture. Against this background,...conference paper 2011
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De Ridder, H. (author)The construction industry is not sustainable. Expressed in percentages of the totals in the Netherlands and when calculated over the total lifecycle, from the early start to the processing of waste after demolition, energy consumption is more than 50%, CO2 emission is more than 50%, waste production is 35 %, road transport is 25 %, failure costs...conference paper 2011
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De Ridder, H. (author)The construction industry is not sustainable. Expressed in percentages of the totals in the Netherlands and when calculated over the total lifecycle, from the early start to the processing of waste after demolition, energy consumption is more than 50%, CO2 emission is more than 50%, waste production is 35 %, road transport is 25 %, failure costs...conference paper 2011
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Meijer, F. (author), Van den Broek, E.L. (author), Schouten, T.E. (author), Damgrave, R.G.J. (author), De Ridder, H. (author)In this paper, we explored the use of low fidelity Synthetic Environments (SE; i.e., a combination of simulation techniques) for product design. We explored the usefulness of low fidelity SE to make design problems explicit. In particular, we were interested in the influence of interactivity on user experience. For this purpose, an industrial...conference paper 2010
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Buzink, S.N. (author), Christie, L.S. (author), Goossens, R.H.M. (author), De Ridder, H. (author), Jakimowicz, J.J. (author)Background - The aim of this study is to investigate the influence of the presence of anatomic landmarks on the performance of angled laparoscope navigation on the SimSurgery SEP simulator. Methods - Twenty-eight experienced laparoscopic surgeons (familiar with 30º angled laparoscope, >100 basic laparoscopic procedures, >5 advanced laparoscopic...journal article 2010
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Van Egmond, R. (author), Pappas, T.N. (author), De Ridder, H. (author)In a previous study we investigated the roughness of real world textures taken from the CUReT database. We showed that people could systematically judge the subjective roughness of these textures. However, we did not determine which objective factors relate to these perceptual judgments of roughness. In the present study we take the first step...conference paper 2010