Video Analysis and Repackaging for Distance Education
Ram, A. Ranjith, Chaudhuri, Subhasis
2012, XIV, 178 p.
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Offers a systematic approach to a higher level video analysis, starting from the basic step of shot detection to media recreation making it very useful for generic video processing
Presents a novel approach for a legibility retentive retargeting of lecture media on mobile devices which promises to enhance the ‘study-on-the-move’ experience
Serves as a reference for the various methods that can be adopted for the compact representation of educational videos at the content provider end
This book presents various video processing methodologies that are useful for distance education. The motivation is to devise new multimedia technologies that are suitable for better representation of instructional videos by exploiting the temporal redundancies present in the original video. This solves many of the issues related to the memory and bandwidth limitation of lecture videos. The various methods described in the book focus on a key-frame based approach which is used to time shrink, repackage and retarget instructional videos. All the methods need a preprocessing step of shot detection and recognition, which is separately given as a chapter. We find those frames which are well-written and distinct as key-frames. A super-resolution based image enhancement scheme is suggested for refining the key-frames for better legibility. These key-frames, along with the audio and a meta-data for the mutual linkage among various media components form a repackaged lecture video, which on a programmed playback, render an estimate of the original video but at a substantially compressed form. The book also presents a legibility retentive retargeting of this instructional media on mobile devices with limited display size. All these technologies contribute to the enhancement of the outreach of distance education programs.
Distance education is now a big business with an annual turnover of over 10-12 billion dollars. We expect this to increase rapidly. Use of the proposed technology will help deliver educational videos to those who are less endowed in terms of network bandwidth availability and to those everywhere who are even on a move by delivering it effectively to mobile handsets (including PDAs). Thus, technology developers, practitioners, and content providers will find the material very useful.
Content Level »Research
Keywords »Horizontal projection profile - Ink pixel - Key-frame extraction - Key-hole image - Local content delivery - Pedagogic content - Text tracking meta-data - Vertical projection profile - Video capsule - Video highlight - Video repackaging - Video retargeting - Video segmentation - Virtual pan - Watermarking
Media for Distance Education.- Instructional Media Repackaging.- Current State of the Art.- Preprocessing of Lecture Videos.- Video Content Re-creation.- Display of Media on Miniature Devices.- Copyright Protection.- Lecture Video Capsule for Course Preview.- Conclusions and Future Directions of Research.- Appendices.- References.- Index.