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The interpretation of aerial images is difficult, especially for low-resolution images. Although solutions have been worked on for many years, performance of these systems is still not sufficient to be useful in practical applications. One potential solution is to create systems composed of many specialized modules. We introduce one such module, a Bayesian tracker for linear structures, such as pipelines...
Virtual collaborative systems are vital tools for accessing and sharing scientific data visualizations. This paper shows how two different modes of collaboration can affect user performance in a specific exploration task. Experiments with groups of users that are working in pairs showed that the lack of mobility can affect the ability to achieve specific exploration goals in a virtual environment...
We propose a new solution to the problem of bi-layer video segmentation in terms of both, hardware design and algorithmic solution. At the data acquisition stage, we combine color video with infrared video, which is robust to illumination changes and provides an automatic initialization of the cue map for foreground-background segmentation. Two algorithms are presented to complete the segmentation,...
Multimedia content is an effective tool for enhancing learning and testing, and it is more effective than the traditional paper and pencil presentation format. In order to make educational materials more intuitive, more interactive and more inspiring to students, image, audio, video, graphics, animation and 3D items are widely used in current educational applications. However, they are designed mainly...
In this paper, we propose a novel method for the automatic segmentation of a foreground layer from a natural scene in real time by fusing infrared, color and edge information. This method improves on previous video foreground/background segmentation algorithms by making the system totally independent of changes in ambient lighting. A powerful data acquisition unit was developed using an optical technique...
Haptic interfaces are used increasingly in medical systems and related applications, but relatively little is known on the effectiveness of these interfaces. This paper reports a study on the perception of haptic force magnitude during hand movements. Discrimination thresholds were determined for a reference force of 1.5N in five different directions (0deg, 45deg, 90deg, 135deg, and 180deg) with respect...
The effect of haptic interfaces on motor skill training has been widely studied. However, relatively little is known about whether haptic training can promote long-term motor skill acquisition. In this paper, we report two experimental studies that investigated the effectiveness of visuohaptic (visual + haptic) interfaces in helping people develop short-term and long-term motor skills. Our first study...
Multimedia content has been used in education applications, e.g. in distance learning, to make learning more intuitive, more interactive and more effective than the traditional presentation formats. Although image, audio, video, graphics, animation and 3D representation can be found in current multimedia implementations, they are designed mainly for learning and not for testing. Most educational tests...
Current image processing and pattern recognition algorithms are not robust enough to make automated remote sensing image interpretation feasible. For this reason, we need to develop image interpretation systems that rely on human guidance. In this paper, we tackle the problem of semiautomatic road tracking in aerial photos. We propose an online learning approach that naturally integrates inputs from...
Detection of lines in noisy image is not easy. When using Hough transform, multiple false peaks may be generated from collinear noisy edge points, which in turn may create false line segments. To overcome this problem, we introduce a method for detecting lines in noise based on directional information. Orientations are generated by Gabor filters to guide an anisotropic Gaussian filtering process,...
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