Publikationen

Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics

Azari, B. ., Wüthrich, C. A., & Bertel, S. . (2017). Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics. In 25th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2017). Plzen, Czech Republic.

Abstract

Creating photo realistic images from real word complex materials is a great challenge: the reflectance function of materials, especially fabrics, has glossy or specular highlights, reflectance anisotropy and retroreflections. This increases greatly the complexity of rendering. Bidirectional Texture Functions (BTFs), i.e. 2D textures acquired under varying illumination and viewing directions, have been used to render complex materials. However, the acquisition of textures for BTF requires up to now expensive setups and the measurement process is very timeconsuming as the directional dependent parameters (lighting and viewing directions) have to be controlled accurately. This paper will present in detail a new low cost programmable device for the rapid acquisition of BTF datasets. The device allows to acquire BTF databases at a fraction of the cost of available setups, and allows to experiment when a texture resolution and sample density increase in the parameter space is not perceivable by an observer of the renderings. The paper proves that using smaller resolution textures and decreasing the samples in parameter space does not lead to a loss of picture quality.
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  Bertel, Sven
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Demonstrating TouchScope: A Hybrid Multitouch Oscilloscope Interface

Heinz, M. ., Bertel, S. ., & Echtler, F. . (2017). Demonstrating TouchScope: A Hybrid Multitouch Oscilloscope Interface. In Proceedings of the 19th ACM International Conference on Multimodal Interaction (S. 501). New York, NY, USA: Association for Computing Machinery. http://doi.org/10.1145/3136755.3143026

Abstract

We present TouchScope, a hybrid multitouch interface for common off-the-shelf oscilloscopes. Oscilloscopes are a valuable tool for analyzing and debugging electronic circuits, but are also complex scientific instruments. Novices are faced with a seemingly overwhelming array of knobs and buttons, and usually require lengthy training before being able to use these devices productively. TouchScope uses a multitouch tablet in combination with an unmodified off-the-shelf oscilloscope to provide a novice-friendly hybrid interface, combining both the low entry barrier of a touch-based interface and the high degrees of freedom of a conventional button-based interface.
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  Bertel, Sven
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Rotate It! – What eye movements reveal about solution strategies of spatial problems.

Wetzel, S. ., Krauß, V. ., & Bertel, S. . (2017). Rotate It! – What eye movements reveal about solution strategies of spatial problems. 2017 European Conference on Eye Movements (ECEM). Wuppertal, Germany.
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  Bertel, Sven
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Underlying Processes of an Inverted Personalization Effect in Multimedia Learning – An Eye-Tracking Study

Zander, S. ., Wetzel, S. ., Kühl, T. ., & Bertel, S. . (2017). Underlying Processes of an Inverted Personalization Effect in Multimedia Learning – An Eye-Tracking Study. Frontiers in Psychology, 8, 2202. http://doi.org/10.3389/fpsyg.2017.02202

Abstract

One of the frequently examined design principles in multimedia learning is the personalization principle. Based on empirical evidence this principle states that using personalized messages in multimedia learning is more beneficial than using formal language (e.g., using ‘you’ instead of ‘the’). Although there is evidence that these slight changes in regard to the language style affect learning, motivation and the perceived cognitive load, it remains unclear, (1) whether the positive effects of personalized language can be transferred to all kinds of content of learning materials (e.g., specific potentially aversive health issues) and (2) which are the underlying processes (e.g., attention allocation) of the personalization effect. German university students (N = 37) learned symptoms and causes of cerebral hemorrhages either with a formal or a personalized version of the learning material. Analysis revealed comparable results to the few existing previous studies, indicating an inverted personalization effect for potentially aversive learning material. This effect was specifically revealed in regard to decreased average fixation duration and the number of fixations exclusively on the images in the personalized compared to the formal version. These results can be seen as indicators for an inverted effect of personalization on the level of visual attention.
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  Bertel, Sven
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Rotate It - Effekte touchbasierter Interaktion auf mobilen Endgeräten beim Lösen räumlicher Aufgaben im Mathematikunterricht der Sekundarstufe

Montag, M. ., Zander, S. ., Wetzel, S. ., & Bertel, S. . (2017). Rotate It - Effekte touchbasierter Interaktion auf mobilen Endgeräten beim Lösen räumlicher Aufgaben im Mathematikunterricht der Sekundarstufe. MediaPsych2017 – 10th Conference of the Media Psychology Division. Landau, Germany.
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Spatial Knowledge Acquired from Pedestrian Urban Navigation Systems

Bertel, S. ., Dressel, T. ., Kohlberg, T. ., & von Jan, V. . (2017). Spatial Knowledge Acquired from Pedestrian Urban Navigation Systems. In Proceedings of the 19th International Conference on Human-Computer Interaction with Mobile Devices and Services. New York, NY, USA: Association for Computing Machinery. http://doi.org/10.1145/3098279.3098543

Abstract

We investigated the spatial knowledge that users of pedestrian navigation support acquire about the navigated area. In particular, we compare two conditions: A spatially richer condition, which provides continual access to information about route directions and surroundings via a local map at closest zoom level. And a spatially sparser condition, in which route directions are given via a tactile display and only as decision points come up. In a field study, 28 participants navigated on foot through a previously unfamiliar urban area. Data on resulting spatial knowledge, gaze distribution on environmental features, performance, individual spatial abilities, and user experience were collected and analysed. We were specifically interested in the route and survey knowledge that participants had acquired. The results point to advantages for acquiring route knowledge through using the sparser, tactile display condition and for acquiring survey knowledge through using the richer map condition. We conclude with discussing ramifications for the design and use of different types of pedestrian navigation support systems for different task scenarios.
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  Bertel, Sven
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Mobiles Lernen - Effekte touch-basierter Interaktion auf Tablets beim Lösen räumlicher Aufgaben im Mathematikunterricht

Montag, M. ., Wetzel, S. ., Bertel, S. ., & Zander, S. . (2017). Mobiles Lernen - Effekte touch-basierter Interaktion auf Tablets beim Lösen räumlicher Aufgaben im Mathematikunterricht. PAEPSY 2017. Münster, Germany.
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  Bertel, Sven
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  Fachbereich 3: Information und Kommunikation
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Publikationen

Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics

Abstract

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Demonstrating TouchScope: A Hybrid Multitouch Oscilloscope Interface

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Rotate It! – What eye movements reveal about solution strategies of spatial problems.

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Underlying Processes of an Inverted Personalization Effect in Multimedia Learning – An Eye-Tracking Study

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Rotate It - Effekte touchbasierter Interaktion auf mobilen Endgeräten beim Lösen räumlicher Aufgaben im Mathematikunterricht der Sekundarstufe

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Spatial Knowledge Acquired from Pedestrian Urban Navigation Systems

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Mobiles Lernen - Effekte touch-basierter Interaktion auf Tablets beim Lösen räumlicher Aufgaben im Mathematikunterricht

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