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Wijntjes, M.W.A. (author)The perception of pictorial surfaces has been studied quantitatively for more than 20 years. During this time, the “gauge figure method” has been shown to be a fast and intuitive method to quantify pictorial relief. In this method, observers have to adjust the attitude of a gauge figure such that it appears to lie flat on a surface in pictorial...journal article 2011
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Wagemans, J. (author), Van Doorn, A.J. (author), Koenderink, J.J. (author)We propose a novel method to probe the depth structure of the pictorial space evoked by paintings. The method involves an exocentric pointing paradigm that allows one to find the slope of the geodesic connection between any pair of points in pictorial space. Since the locations of the points in the picture plane are known, this immediately...journal article 2011
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Van Doorn, A.J. (author), Koenderink, J.J. (author), Wagemans, J. (author)From a theoretical point of view, the use of the shading cue involves estimates of the light field and thus observers need to judge the light field and the shape simultaneously. The conventional stimulus in perceptual experiments, a circular disk filled with a monotonic gradient on a uniform surround, represents a local shading or tonal gradient...journal article 2011
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Jakimowicz, J.J. (author), Jakimowicz, C.M. (author)With the introduction of new techniques and technologies, operative skills became a crucial part of surgical competence, deserving more attention. Implementation of validated simulation modalities into the training curriculum is emphasized. It became obvious that operative skills should be brought to an adequate level of proficiency using...journal article 2011
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Karlsson, S.M. (author), Pont, S.C. (author), Koenderink, J.J. (author), Zisserman, A. (author)We investigate the estimation of illuminance flow using Histograms of Oriented Gradient features (HOGs). In a regression setting, we found for both ridge regression and support vector machines, that the optimal solution shows close resemblance to the gradient based structure tensor (also known as the second moment matrix). Theoretical results...journal article 2010
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- Botden, S.M.B.I. (author), Christie, L. (author), Goossens, R. (author), Jakimowicz, J.J. (author) journal article 2010
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Volcic, R. (author), Wijntjes, M.W.A. (author), Kool, E.C. (author), Kappers, A.M.L. (author)The simple experience of a coherent percept while looking and touching an object conceals an intriguing issue: different senses encode and compare information in different modality-specific reference frames. We addressed this problem in a cross-modal visuo-haptic mental rotation task. Two objects in various orientations were presented at the...journal article 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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Vonck, D. (author), Goossens, R.H.M. (author), Van Eijk, D.J. (author), De Hingh, I.H.J.T. (author), Jakimowicz, J.J. (author)Background- Laparoscopic surgery requires specially designed instruments. Bowel tissue damage is considered one of the most serious forms of lesion, specifically perforation of the bowel. Methods - An experimental setting was used to manipulate healthy pig bowel tissue via two vacuum instruments. During the experiments, two simple manipulations...journal article 2010
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- Lamata, P. (author), Lamata, F. (author), Sojar, V. (author), Makowski, P. (author), Massoptier, L. (author), Casciaro, S. (author), Ali, W. (author), Stüdeli, T. (author), Declerck, J. (author), Elle, O.J. (author), Edwin, B. (author) journal article 2010
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Buzink, S.N. (author), Goossens, R.H.M. (author), Schoon, E.J. (author), De Ridder, H. (author), Jakimowicz, J.J. (author)Background - Surgical techniques that draw from multiple types of image-based procedures (IBP) are increasing, such as Natural Orifice Transluminal Endoscopic Surgery, fusing laparoscopy and flexible endoscopy. However, little is known about the relation between psychomotor skills for performing different types of IBP. For example, do basic...journal article 2010
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Buzink, S.N. (author), Van Lier, L. (author), De Hingh, I.H.J.T. (author), Jakimowicz, J.J. (author)Background - Awareness of the relative high rate of adverse events in laparoscopic surgery created a need to safeguard quality and safety of performance better. Technological innovations, such as integrated operating room (OR) systems and checklists, have the potential to improve patient safety, OR efficiency, and surgical outcomes. This study...journal article 2010
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Wauben, L.S.G.L. (author), Goossens, R.H.M. (author), Lange, J.F. (author)Background - Laparoscopic cholecystectomy (LC) is the most performed minimal invasive surgical procedure and has a relatively high complication rate. As complications are often revealed postoperatively, clear, accurate, and timely written operative notes are important in order to recall the procedure and start follow-up treatment as soon as...journal article 2010
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Ravelli, H. (author), Van Rooijen, M. (author), Jongert, T. (author), De Voogd-Claessen, H. (author), Hoyng, J. (author), Van der Zande, M.E. (author), Karreman, D.E. (author)Stimulating the physical condition of children in a playful way is the main goal of the Banjy. Crossover product combining a traditional elliptical trainer and a bicycle. This means that it has all the benefits of training almost all muscles combined with the playful and functional possibilities of a bike. Early 2009 innovation support from...journal article 2010
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Gielen, M.A. (author)The paper aims at contributing to the professional development of toy design education programs. It draws from the practice of a children’s toy design course at Delft University of Technology. It identifies three major concepts that greatly influence toy quality and that students find difficult to understand and apply: aimlessness, empathy and...journal article 2009
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Leal Penados, A. (author), Gielen, M.A. (author), Stappers, P.J. (author), Jongert, T. (author)Health experts are worried about the increase in the number of overweight children and the decrease in activity levels among this age group. This project explores the possibilities of using interactive toys and social interaction in encouraging children to become more physically active. To arrive at the final concept, research was conducted into...journal article 2009
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Buzink, S.N. (author), Botden, S.M.B.I. (author), Heemskerk, J. (author), Goossens, R.H.M. (author), De Ridder, H. (author), Jakimowicz, J.J. (author)Background: It is a tacit assumption that clinically based expertise in laparoscopic tissue manipulation entails skilfulness in angled laparoscope navigation. The main objective of this study was to investigate the relation between these skills. To this end, face and construct validity had to be established for the place arrow (PA) and camera...journal article 2009
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Stappers, P.J. (author), Hoffman, R.R. (author)In one of the earlier essays in this department, we discussed a number of acronyms all having to do with system design, and all having the form "x-centered design." The purpose of that essay was to demonstrate a broad framework within which to understand human-centered computing (HCC), and also to show the various convergences and divergences of...journal article 2009
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- Mulder, I. (author), Schikhof, Y. (author), Vastenburg, M.H. (author), Card, A. (author), Dunn, T. (author), Komninos, A. (author), McGee-Lennon, M. (author), Santcroos, M. (author), Tiotto, G. (author), Van Gils, M. (author), Van 't Klooster, J.W. (author), Veys, A. (author), Zarifi Eslami, M. (author) journal article 2009
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Pluyter, J.R. (author), Buzink, S.N. (author), Rutkowski, A.F. (author), Jakimowicz, J.J. (author)Background. Surgeons perform complex tasks while exposed to multiple distracting sources that may increase stress in the operating room (e.g., music, conversation, and unadapted use of sophisticated technologies). This study aimed to examine whether such realistic social and technological distracting conditions may influence surgical performance...journal article 2009