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Expanding the point: automatic enlargement of presentation video elements

Published: 28 November 2011 Publication History

Abstract

We present a system that assists users in viewing videos of lectures on small screen devices, such as cell phones. It automatically identifies semantic units on the slides, such as bullets, groups of bullets, and images. As the participant views the lecture, the system magnifies the appropriate semantic unit while it is the focus of the discussion. The system makes this decision based on cues from laser pointer gestures and spoken words that are read off the slide. It then magnifies the semantic element using the slide image and the homography between the slide image and the video frame. Experiments suggest that the semantic units of laser-based events identified by our algorithm closely match those identified by humans. In the case of identifying bullets through spoken words, results are more limited but are a good starting point for more complex methods. Finally, we show that this kind of magnification has potential for improving learning of technical content from video lectures when the resolution of the video is limited, such as when being viewed on hand held devices.

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Cited By

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  • (2021)Slidecho: Flexible Non-Visual Exploration of Presentation VideosProceedings of the 23rd International ACM SIGACCESS Conference on Computers and Accessibility10.1145/3441852.3471234(1-12)Online publication date: 17-Oct-2021
  • (2021)Say It All: Feedback for Improving Non-Visual Presentation AccessibilityProceedings of the 2021 CHI Conference on Human Factors in Computing Systems10.1145/3411764.3445572(1-12)Online publication date: 6-May-2021
  • (2014)MobiSLIC: Content-Aware Energy Saving for Educational Videos on Mobile DevicesMobile and Ubiquitous Systems: Computing, Networking, and Services10.1007/978-3-319-11569-6_31(396-408)Online publication date: 28-Sep-2014
  • Show More Cited By

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  1. Expanding the point: automatic enlargement of presentation video elements

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      cover image ACM Conferences
      MM '11: Proceedings of the 19th ACM international conference on Multimedia
      November 2011
      944 pages
      ISBN:9781450306164
      DOI:10.1145/2072298
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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      Publication History

      Published: 28 November 2011

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      Author Tags

      1. laser
      2. learning
      3. lecture
      4. magnification
      5. mobile
      6. speech
      7. video

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      MM '11
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      MM '11: ACM Multimedia Conference
      November 28 - December 1, 2011
      Arizona, Scottsdale, USA

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      Overall Acceptance Rate 2,145 of 8,556 submissions, 25%

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      Cited By

      View all
      • (2021)Slidecho: Flexible Non-Visual Exploration of Presentation VideosProceedings of the 23rd International ACM SIGACCESS Conference on Computers and Accessibility10.1145/3441852.3471234(1-12)Online publication date: 17-Oct-2021
      • (2021)Say It All: Feedback for Improving Non-Visual Presentation AccessibilityProceedings of the 2021 CHI Conference on Human Factors in Computing Systems10.1145/3411764.3445572(1-12)Online publication date: 6-May-2021
      • (2014)MobiSLIC: Content-Aware Energy Saving for Educational Videos on Mobile DevicesMobile and Ubiquitous Systems: Computing, Networking, and Services10.1007/978-3-319-11569-6_31(396-408)Online publication date: 28-Sep-2014
      • (2012)Client-side backprojection of presentation slides into educational videoProceedings of the 20th ACM international conference on Multimedia10.1145/2393347.2396368(1005-1008)Online publication date: 29-Oct-2012

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