MPEG: a video compression standard for multimedia applications
Communications of the ACM - Special issue on digital multimedia systems
Perceptual quality metrics applied to still image compression
Signal Processing - Special issue on image and video quality metrics
A video disc oriented educational system
SIGCSE '76 Proceedings of the ACM SIGCSE-SIGCUE technical symposium on Computer science and education
Real-time content analysis and adaptive transmission of lecture videos for mobile applications
Proceedings of the 12th annual ACM international conference on Multimedia
Virtualized Classroom - Automated Production, Media Integration and User-Customized Presentation
CVPRW '04 Proceedings of the 2004 Conference on Computer Vision and Pattern Recognition Workshop (CVPRW'04) Volume 9 - Volume 09
Communication Systems
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With multimedia E-learning becoming popular, better compression algorithms are required that are space efficient but maintain the quality of video data, particularly slide and blackboard text. In this paper, an educational video compression technique is presented that dynamically allocates the space according to the content importance of each video segment in the educational videos. We present a phase correlation based motion estimation and compensation algorithm to encode important moving objects in efficient manner. Temporal coherence is exploited in a two phase manner. First, the frames with high similarity are categorized and encoded efficiently. Secondly, the compression ratio is adapted according to the frame content. The algorithm is compared with the state-of-the-art standards such as H.261, MPEG-4, etc. on large database. The comparison shows that for similar bit rates, the video quality for our algorithm is significantly better than the other methods.