Stanford's video processing in the cloud allows interactive streaming of online lectures.
The software divides the original video into rectangular "tiles" and considers each tile its own video stream. The server stores the tiles in a variety of resolutions, from a wide view at the back of the room to close-up shots. To reduce the amount of information sent while streaming, the program transmits only those tiles that a viewer requests. When a user zooms in, the server delivers the close-up stream.
The ClassX interface pairs the lecture video with slides from a computer presentation. The program automatically analyzes the video using advanced computer vision algorithms and synchronizes the slides with the video, advancing the displayed slide when it changes in the video. Slide synchronization also makes it extremely easy to jump to a specific topic within the lecture, which can be tedious when searching through a single 75-minute video.
Fuente:
http://news.stanford.edu/news/2011/june/classx-video-processing-062811.html




Proyecto de Tecnología Educativa I
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