Semantic exploration of lecture videos
Proceedings of the tenth ACM international conference on Multimedia
Matching slides to presentation videos using SIFT and scene background matching
MIR '06 Proceedings of the 8th ACM international workshop on Multimedia information retrieval
Accurate alignment of presentation slides with educational video
ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
Studying on the move: enriched presentation video for mobile devices
INFOCOM'09 Proceedings of the 28th IEEE international conference on Computer Communications Workshops
Restoration of out-of-focus lecture video by automatic slide matching
Proceedings of the international conference on Multimedia
Expanding the point: automatic enlargement of presentation video elements
MM '11 Proceedings of the 19th ACM international conference on Multimedia
Robust Spatiotemporal Matching of Electronic Slides to Presentation Videos
IEEE Transactions on Image Processing
Hi-index | 0.00 |
A significant part of many videos of lectures is presentation slides that occupy much of the field of view. Further, for a student studying the lecture, having the slides sharply displayed is especially important, compared with the speaker, background, and audience. However, even if the original capture supports it, the bandwidth required for real time viewing is substantive, especially in the context of mobile devices. Here we propose reconstructing the video on the client side by backprojecting high resolution slide images into the video stream with the slide area blacked out. The high resolution slide deck can be sent once, and inserted into the video on the client side based on the transformation (a homography) computed in advance. We further introduce the idea that needed homography transformations can be approximated using affine transformations, which allows it to be done using built-in capabilities of HTML 5. We find that it is possible to significantly reduce bandwidth by compressing the modified video, while improving the slide area quality, but leaving the non-slide area roughly the same.