Instructor Contour Extraction and Overlay for Near-real Presence in e-Learning Systems

Ramkumar N, Balaji Hariharan, Uma Gopalakrishnan, Venkat Rangan

Abstract

E-Learning technologies focus on methods to replicate entities such as white board, presentation screen and other teaching aids in remote classrooms. Often, a high detail video stream of the whiteboard or presentation screen (board-stream) is streamed to the remote classroom along with the instructor’s video stream. However, remote participants find it difficult to correlate between the two displayed streams to find out the area focused by the instructor‘s gestures such as finger pointing over the board. This paper deals with a method to overlay the instructor's contour-extracted frames from the instructor-stream over the board-stream for remote participants. Since the board-stream and instructor-stream have different camera perspectives, a transformation from the instructor’s video perspective to the board-stream perspective has to be made before overlay. The process includes finding the Homography-matrix, warping and overlay. Our performance results indicate that remote participants are able to discern the area focused by the instructor on the board with much greater accuracy and speed.

References

  1. Huettner, Brenda., 2008. Adobe Captivate 3: The Definitive Guide. Jones & Bartlett Learning.
  2. Bijlani, Kamal, et al. 2010. A-view: adaptive bandwidth for telepresence and large user sets in live distance education. Education Technology and Computer (ICETC), 2010 2nd International Conference on. Vol. 2. IEEE.
  3. Davison., Andrew., 2012. Kinect Open Source Programming Secrets: Hacking the Kinect with OpenNI, NITE, and Java: Hacking the Kinect with OpenNI, NITE, and Java. McGraw Hill Professional.
  4. Wolberg, George., 1990. Digital image warping. Vol. 10662. Los Alamitos: IEEE computer society press.
  5. Wolberg, George., 1990. Digital image warping. Vol. 10662. Los Alamitos: IEEE computer society press.
  6. Krishnamurthy, Sundar Narayan., 2011. Human Detection and Extraction using Kinect Depth Images. Bournemouth University.
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Paper Citation


in Harvard Style

N R., Hariharan B., Gopalakrishnan U. and Rangan V. (2016). Instructor Contour Extraction and Overlay for Near-real Presence in e-Learning Systems . In Proceedings of the 8th International Conference on Computer Supported Education - Volume 1: CSEDU, ISBN 978-989-758-179-3, pages 353-358. DOI: 10.5220/0005803303530358


in Bibtex Style

@conference{csedu16,
author={Ramkumar N and Balaji Hariharan and Uma Gopalakrishnan and Venkat Rangan},
title={Instructor Contour Extraction and Overlay for Near-real Presence in e-Learning Systems},
booktitle={Proceedings of the 8th International Conference on Computer Supported Education - Volume 1: CSEDU,},
year={2016},
pages={353-358},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005803303530358},
isbn={978-989-758-179-3},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 8th International Conference on Computer Supported Education - Volume 1: CSEDU,
TI - Instructor Contour Extraction and Overlay for Near-real Presence in e-Learning Systems
SN - 978-989-758-179-3
AU - N R.
AU - Hariharan B.
AU - Gopalakrishnan U.
AU - Rangan V.
PY - 2016
SP - 353
EP - 358
DO - 10.5220/0005803303530358