• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 122
  • 32
  • 18
  • 17
  • 8
  • 2
  • Tagged with
  • 357
  • 151
  • 115
  • 114
  • 114
  • 40
  • 33
  • 31
  • 26
  • 26
  • 26
  • 24
  • 23
  • 23
  • 22
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Visual speech in technology-enhanced learning

Dey, Priya January 2012 (has links)
This thesis investigates the use of synthetic talking heads, with lip, tongue and face movements synchronized with synthesized or natural speech, in technology-enhanced learning. This work applies talking heads in a speech tutoring application for teaching English as a second language. Previous studies have shown that speech perception is aided by visual information, but more research is needed to determine the effectiveness of visualization of articulators in pronunciation training. This thesis explores whether or not visual speech technology can give an improvement in learning pronunciation. This thesis investigates techniques for audiovisual speech synthesis, using both viseme-based and data-driven approaches to implement multiple talking heads. Intelligibility studies found the audiovisual heads to be more intelligible than audio alone, and the data-driven head was found to be more intelligible than the viseme-driven implementation. The talking heads are applied in a pronunciation-training application, which is evaluated by second-language learners to investigate the benefit of visual speech in technology-enhanced learning. User trials explored the efficacy of the software in demonstrating the /b/–/p/ contrast in English. The results indicate that learners showed an improvement in listening and pronunciation after using the software, while the benefit of visualization compared to auditory training alone varied between individuals. User evaluations found that the talking heads were perceived to be helpful in learning pronunciation, and the positive feedback on the tutoring system suggests that the use of talking heads in technology-enhanced learning could be useful in addition to traditional methods.
12

Person-centred design of assistive technology systems

Dewsbury, Guy Alexander January 2009 (has links)
No description available.
13

Stereo vision based mapping and immediate virtual walkthroughs

Hirschmuller, Heiko January 2003 (has links)
This thesis investigates stereo vision based techniques for supporting work with teleoperated mobile robots. In particular, the tasks of navigation and control of the robot in unknown environments as well as control of the manipulator are considered. Support is required with map overviews and images from novel viewpoints. Challenges are to create maps and novel images in real time, exclusively from image sequences of a calibrated stereo camera that is allowed to move arbitrarily in three dimensions. Furthermore, no assumptions are made about the environment. These requirements have led to research in the areas of stereo vision, camera motion estimation, mapping and novel view synthesis. Several contributions have been made in these areas. Firstly, the behaviour of stereo correlation is analysed and a new real time stereo algorithm derived, which has reduced matching errors compared to traditional algorithms. Secondly, a new robust real time camera motion estimation method is described, which exclusively uses stereo images and permits arbitrary camera motion. Thirdly, a new method for creating two-dimensional maps from images of a stereo camera under arbitrary three-dimensional motion is presented. Finally, novel view synthesis is performed in disparity space of source stereo images using a new method. All the proposed techniques have been integrated into the Immediate Reality Scanner (IRIS) system. The system performs incremental mapping, immediate virtual walkthroughs and dynamic novel views exclusively from a stereo camera under arbitrary three-dimensional motion. Mapping and immediate virtual walkthroughs can be performed in real time, concurrently to scanning the environment. The thesis describes camera calibration, stereo processing, camera motion estimation, map building, novel view synthesis and the integration into IRIS, including evaluations in all areas. It is concluded that IRIS does not only fulfil the requirements of the anticipated application on teleoperated mobile robots, but could also be used in a wide range of robotics and non-robotics applications. It is believed that IRIS is the first system that allows incremental mapping and immediate virtual walkthroughs in real time concurrently to scanning an unconstrained environment with an arbitrarily moving stereo camera
14

Canonical correlation analysis and artificial neural networks

Gou, Zhenkun January 2003 (has links)
No description available.
15

Closely interacting figures in a virtual environment

Pugach, Stanislav January 2003 (has links)
No description available.
16

The modification of internal representations as a mechanism for learning in neural systems

Wren, Kangda January 2001 (has links)
No description available.
17

Image restoration exploiting statistical models of the image capture process

Chana, Deeph S. January 2001 (has links)
No description available.
18

Lossless compression for computer generated animation sequences

Lopez-Hernandez, Roberto January 2002 (has links)
No description available.
19

Tears in the rain

By, Tomas January 2002 (has links)
No description available.
20

Time-predefined and trajectory-based search : single and multiobjective approaches to exam timetabling

Bykov, Yuri January 2003 (has links)
No description available.

Page generated in 0.0312 seconds