Video Object Tracking And Analysis For Computer Assisted Surgery

Pedicle screw insertion technique has made revolution in the surgical treatment of spinal fractures and spinal disorders. Although X- ray fluoroscopy based navigation is popular, there is risk of prolonged exposure to X- ray radiation. Systems that have lower radiation risk are generally quite expensive. The position and orientation of the drill is clinically very important in pedicle screw fixation. In this paper, the position and orientation of the marker on the drill is determined using pattern recognition based methods, using geometric features, obtained from the input video sequence taken from CCD camera. A search is then performed on the video frames after preprocessing, to obtain the exact position and orientation of the drill. An animated graphics, showing the instantaneous position and orientation of the drill is then overlaid on the processed video for real time drill control and navigation

Perceptual Evaluation of Video-Realistic Speech

abstract With many visual speech animation techniques now available, there is a clear need for systematic perceptual evaluation schemes. We describe here our scheme and its application to a new video-realistic (potentially indistinguishable from real recorded video) visual-speech animation system, called Mary 101. Two types of experiments were performed: a) distinguishing visually between real and synthetic image- sequences of the same utterances, ("Turing tests") and b) gauging visual speech recognition by comparing lip-reading performance of the real and synthetic image-sequences of the same utterances ("Intelligibility tests"). Subjects that were presented randomly with either real or synthetic image-sequences could not tell the synthetic from the real sequences above chance level. The same subjects when asked to lip-read the utterances from the same image-sequences recognized speech from real image-sequences significantly better than from synthetic ones. However, performance for both, real and synthetic, were at levels suggested in the literature on lip-reading. We conclude from the two experiments that the animation of Mary 101 is adequate for providing a percept of a talking head. However, additional effort is required to improve the animation for lip-reading purposes like rehabilitation and language learning. In addition, these two tasks could be considered as explicit and implicit perceptual discrimination tasks. In the explicit task (a), each stimulus is classified directly as a synthetic or real image-sequence by detecting a possible difference between the synthetic and the real image-sequences. The implicit perceptual discrimination task (b) consists of a comparison between visual recognition of speech of real and synthetic image-sequences. Our results suggest that implicit perceptual discrimination is a more sensitive method for discrimination between synthetic and real image-sequences than explicit perceptual discrimination.

Visual SLAM for underwater vehicles using video velocity log and natural landmarks

A visual SLAM system has been implemented and optimised for real-time deployment on an AUV equipped with calibrated stereo cameras. The system incorporates a novel approach to landmark description in which landmarks are local sub maps that consist of a cloud of 3D points and their associated SIFT/SURF descriptors. Landmarks are also sparsely distributed which simplifies and accelerates data association and map updates. In addition to landmark-based localisation the system utilises visual odometry to estimate the pose of the vehicle in 6 degrees of freedom by identifying temporal matches between consecutive local sub maps and computing the motion. Both the extended Kalman filter and unscented Kalman filter have been considered for filtering the observations. The output of the filter is also smoothed using the Rauch-Tung-Striebel (RTS) method to obtain a better alignment of the sequence of local sub maps and to deliver a large-scale 3D acquisition of the surveyed area. Synthetic experiments have been performed using a simulation environment in which ray tracing is used to generate synthetic images for the stereo system

Video Institucional Biblioteca Universidad del Rosario

El video expone un panorama general de la Biblioteca de la Universidad del Rosario; contiene información sobre las diferentes sedes, horarios, los principales recursos y servicios que se ofrecen a los usuarios. A través de este medio audiovisual el espectador podrá conocer a grandes rasgos cómo la Biblioteca de la Universidad del Rosario ha pasado a ser un moderno centro de apoyo a las labores académicas, investigativas y culturales de la Universidad.

iTunesU - open educational content in audio and video formats available via iTunes

There is a wealth of open educational content in audio and video formats available via iTunes U, one of the services offered especially for education via iTunes. There are details of how to get started as well as an informative video to help you. Details of how to get started with sharing content can be found for developers.

Link to ten short video episodes about groupwork

"Rob, Vikki, Shireen, Muzz and Delia have been randomly selected to work together to develop a presentation entitled 'The barriers to learning'. It's not an easy ride. The following 10 episodes show the journey, from their first meeting through to their impressions of the presentation and working together". Produced by the LearnHigher CETL Three areas covered by the site as follows Listening and Interpersonal Skills - the University of Leeds Oral Presentations - Brunel University Group Work - Bradford University

Laser Safety in higher education - Classic video!

Vintage video (1986) on laser safety, presented by Dr. Gillian Rice. This is a 37 minute video, explaining the hazards which are likely to be encountered and ways to reduce those hazards in teaching and research laboratories in higher education. Presented in 5 parts: Part 1 (1:49) Laser radiation and the body Part 2 (8:49) Classes of laser Part 3 (13:32) Safety measures Part 4 (21:32) Other risks: precautions Part 5 (31:49) Summary

Additional Exam Responsibilities video

This video is for students with specific learning differences that mean that they are entitled to use a computer to type written examinations rather than writing them longhand. It show them how to use the special AER workstations that provide a cut-down version of Microsoft Word and absolutely no access to the Internet.

Laser Health and Safety Interactive Video

This short video is designed to make you think about the safety aspects of working with lasers within laser laboratories. Postgraduates and research fellows work with many different types of lasers in a variety of different experimental conditions. These lasers are often more powerful than those used as an undergraduate and require additional safety practices. The video was demonstrated to the EUNIS 2008 conference Aarhus, Denmark, and was a finalist in the Dorup E-Learning Award.

Adding Camtasia video files to Blackboard

This short video shows how to add a video produced using Camtasia Studio to a Blackboard course

IT Induction Video's (iSolutions)

Video's from iSolutions introducing student related ICT services.

University IT and iSolutions video Induction

Materials from week 0 induction at Winchester School of Art and details on setting up your iSolutions university account

Video Collection from YouTube

Videos (mpg) for Therese Allan

An introduction to video podcasts

This PowerPoint slideshow covers the educational uses of video podcasts, describes how RSS feeds work and shows how they can be created using Blackboard.