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A. Wojciechowski

Abstract

Artificial camera navigation is the most ubiquitous and principal interaction task within a virtual environment. Efficient and intuitive virtual scene navigation affects other tasks completion performance. Though many scientists have elaborated invaluable navigation techniques design guidelines, it is still, especially for novice users, the really challenging and demanding process. The user interface input hardware imprecision, interface operation cognitive burden put on users and deficiency of direct mapping between user physical movement and virtual camera navigation evoke discrepancy between user desired and actual camera position and orientation. The provided paper concentrates on the new potential field based camera navigation support method. Originally designed and exploited potential fields support not only collisions solving, but goal profiled attraction and camera manoeuvring as well. It works both in static and dynamic environments. It can be easily boosted by the GPU approach and eventually can be easily adapted for advanced or novice interface users for a miscellaneous navigation task completion.

Open access

A. Wojciechowski and K. Fornalczyk

Abstract

Eye-gaze tracking is an aspect of human-computer interaction still growing in popularity,. Tracking human gaze point can help control user interfaces and may help evaluate graphical user interfaces. At the same time professional eye-trackers are very expensive and thus unavailable for most of user interface researchers and small companies. The paper presents very effective, low cost, computer vision based, interactive eye-gaze tracking method. On contrary to other authors results the method achieves very high precision (about 1.5 deg horizontally and 2.5 deg vertically) at 20 fps performance, exploiting a simple HD web camera with reasonable environment restrictions. The paper describes the algorithms used in the eye-gaze tracking method and results of experimental tests, both static absolute point of interest estimation, and dynamic functional gaze controlled cursor steering.

Open access

JACEK B£A ZÿEWICZ, Mikhail Kovalyov, Jędrzej Musiał, Andrzej Urbanski and Adam Wojciechowski

Internet shopping optimization problem

A high number of Internet shops makes it difficult for a customer to review manually all the available offers and select optimal outlets for shopping. A partial solution to the problem is brought by price comparators which produce price rankings from collected offers. However, their possibilities are limited to a comparison of offers for a single product requested by the customer. The issue we investigate in this paper is a multiple-item multiple-shop optimization problem, in which total expenses of a customer to buy a given set of items should be minimized over all available offers. In this paper, the Internet Shopping Optimization Problem (ISOP) is defined in a formal way and a proof of its strong NP-hardness is provided. We also describe polynomial time algorithms for special cases of the problem.

Open access

Marcin Bąkała, Rafał Wojciechowski, Dominik Sankowski and Adam Rylski

Abstract

Determination of the physico-chemical interactions between liquid and solid substances is a key technological factor in many industrial processes in metallurgy, electronics or the aviation industry, where technological processes are based on soldering/brazing technologies. Understanding of the bonding process, reactions between materials and their dynamics enables to make research on new materials and joining technologies, as well as to optimise and compare the existing ones. The paper focuses on a wetting force measurement method and its practical implementation in a laboratory stand – an integrated platform for automatic wetting force measurement at high temperatures. As an example of using the laboratory stand, an analysis of Ag addition to Cu-based brazes, including measurement of the wetting force and the wetting angle, is presented.

Open access

Mateusz Ściborski, Włodzimierz Meissner, Robert Krupa, Radosław Włodarczyk, Krzysztof Kaczmarek, Rafał Bargiel, Adam Wojciechowski, Aleksandra Raniczkowska, Radosław Kozik and Juliusz Pietrasik

Fieldwork results of wader research stations working in Poland in 2002-2003

Open access

Szymon Bzoma, Włodzimierz Meissner, Tomasz Janiszewski, Magdalena Wybraniec, Magdalena Remisiewicz, Robert Krupa, Radosław Kozik, Krzysztof Kaczmarek, Anna Kleszcz, Piotr Minias, Radosław Włodarczyk, Krzysztof Lukoszek and Adam Wojciechowski

Fieldwork Results of Wader Research Stations Working in Poland in 2006-2008

Open access

Włodzimierz Meissner, Małgorzata Krupa, Magdalena Remisiewicz, Robert Krupa, Piotr Minias, Krzysztof Kaczmarek, Tomasz Janiszewski, Radosław Włodarczyk, Radosław Kozik, Piotr Rydzkowski, Lucjan Kleinschmidt and Adam Wojciechowski

Results of Fieldwork of Wader Research Stations Working in Poland in 2004-2005