735 research outputs found
The State of the Art of Spatial Interfaces for 3D Visualization
International audienceWe survey the state of the art of spatial interfaces for 3D visualization. Interaction techniques are crucial to data visualization processes and the visualization research community has been calling for more research on interaction for years. Yet, research papers focusing on interaction techniques, in particular for 3D visualization purposes, are not always published in visualization venues, sometimes making it challenging to synthesize the latest interaction and visualization results. We therefore introduce a taxonomy of interaction technique for 3D visualization. The taxonomy is organized along two axes: the primary source of input on the one hand and the visualization task they support on the other hand. Surveying the state of the art allows us to highlight specific challenges and missed opportunities for research in 3D visualization. In particular, we call for additional research in: (1) controlling 3D visualization widgets to help scientists better understand their data, (2) 3D interaction techniques for dissemination, which are under-explored yet show great promise for helping museum and science centers in their mission to share recent knowledge, and (3) developing new measures that move beyond traditional time and errors metrics for evaluating visualizations that include spatial interaction
Leap motion for sterile manipulation of 3D models
Performing surgeries with 3D models are to an increasing extent becoming normal practice.
The common tool for manipulating these 3D objects is with a computer mouse, which is not
designed for a three-dimensional virtual space. Thus, the use of a computer mouse in
combination with 3D objects is not intuitive. This is the reason for experimenting with new
input devices, such as the Leap Motion device, to enhance the workflow of controlling 3D
objects. Therefore, the project developed a program for manipulating these models in Unity
with the Leap Motion device. A user survey was conducted to identify issues and help
understand how the surgeons use and interact directly with a 3D object in a sterile manner.
The results of this project strongly support the fact that the usage of the Leap Motion is
more efficient in various tasks than a computer mouse. With this the Leap Motion stacks
upon revolutionary 2D imaging in medical practice, and thus is an important piece in future
medical care and surgery
Haptic feedback in freehand gesture interaction
In this thesis work, haptic feedback in gesture interaction was studied. More precisely, focus was on vibrotactile feedback and freehand gestural input methods. Vibrotactile feedback methods have been studied extensively in the fields of touch-based interaction, remote control and mid-air gestural input, and mostly positive effects on user performance have been found. An experiment was conducted in order to investigate if vibrotactile feedback has an impact on user performance in a simple data entry task. In the study, two gestural input methods were compared and the effects of visual and vibrotactile feedback added to each method were examined. Statistically significant differences in task performance between input methods were found. Results also showed that less keystrokes per character were required with visual feedback. No other significant differences were found between the types of feedback. However, preference for vibrotactile feedback was observed. The findings indicate that the careful design of an input method primarily has an impact on user performance and the feedback method can enhance this performance in diverse ways
Image processing techniques for mixed reality and biometry
2013 - 2014This thesis work is focused on two applicative fields of image processing research,
which, for different reasons, have become particularly active in the last decade: Mixed
Reality and Biometry. Though the image processing techniques involved in these two
research areas are often different, they share the key objective of recognizing salient
features typically captured through imaging devices.
Enabling technologies for augmented/mixed reality have been improved and refined
throughout the last years and more recently they seems to have finally passed the demo
stage to becoming ready for practical industrial and commercial applications. To this
regard, a crucial role will likely be played by the new generation of smartphones and
tablets, equipped with an arsenal of sensors connections and enough processing power
for becoming the most portable and affordable AR platform ever. Within this context,
techniques like gesture recognition by means of simple, light and robust capturing
hardware and advanced computer vision techniques may play an important role in
providing a natural and robust way to control software applications and to enhance onthe-
field operational capabilities. The research described in this thesis is targeted toward
advanced visualization and interaction strategies aimed to improve the operative range
and robustness of mixed reality applications, particularly for demanding industrial
environments... [edited by Author]XIII n.s
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