Presentation on theme: "SmartPlayer: User-Centric Video Fast-Forwarding K.-Y. Cheng, S.-J. Luo, B.-Y. Chen, and H.-H. Chu ACM CHI 2009 (international conference on Human factors."— Presentation transcript:
SmartPlayer: User-Centric Video Fast-Forwarding K.-Y. Cheng, S.-J. Luo, B.-Y. Chen, and H.-H. Chu ACM CHI 2009 (international conference on Human factors in computing systems)
Outline Introduction SmartPlayer – User-Centric Video Fast-Forwarding – Skimming Model – User Interface Results Conclusion
Introduction Microsoft Windows Media Player – Play, pause, stop, fast-forward, rewind/reverse video
Introduction Video summarization – Still-image abstraction —key frame extraction Ex: image mosaic – Video skimming Short video summary Video analysis techniques – Image/video features – Different video types
Introduction SmartPlayer – Adjust playback speed Complexity of the current scene Predefined semantic events – Learn user’s preferences About predefined semantic events User’s favorite playback speed – Play video continuously Not to miss any undefined events
User Behavior Observation And Inquiry User inquiry – 10 participants: 5 males and 5 females – How users fast-forwarding these videos? Video typeNumber of people who Fast-forward Surveillance video10 Sport video9 Movies0 Lecture videos2
User Behavior Observation And Inquiry User inquiry – surveillance, baseball, tennis, golf, and wedding videos – training videos – prototype player accelerate and decelerate (1~16x) Can jump to the normal speed One user’s watching pattern for a baseball video.
User-Centric Video Fast-Forwarding User behavior – Users tend to maintain a constant playback speed within a video shot. – Users prefer gradual increases of playback speed. – Users set the playback rate based on several minutes of recently viewed shots. SmartPlayer – Cut the video into segments – Adjust the playback speed gradually across segment boundaries – Speed control
Skimming Model Speed control – motion complexity – speed of the previous content
Skimming Model Motion layer – Color detect shot boundaries – Motion extract optical flows between frames using the Lucas-Kanade method  Lienhart, R. Comparison of automatic shot boundary detection algorithms. SPIE Storage and Retrieval for Image and Video Databases VII 3656, (1999), 290-301.
Skimming Model Semantic layer – Extract semantic event points in video – Manual annotation Video typeEvents BaseballPitch, hit, homerun…… SurveillanceAppearance of pedestrians, cars, bicycles WeddingFormal wedding procedure NewsPolitical, financial, life, international event DramaNo event
Conclusion Automatically adapts its playback speed according to : – scene complexity – predefined events of interest – user’s preferences with respect to playback speed Learn user’s preferred event types and playback speeds for these event types Not skipping any segments
An Extended Framework for Adaptive Playback-Based Video Summarization Kadir A. Peker and Ajay Divakaran SPIE ITCOM 2003
Features Visual complexity – Motion activity: motion vector – Spatial complexity: DCT coefficient visual complexity=(motion vector) ‧ (DCT coefficient) For each DCT coefficient visual complexity= mean(cumulative energy at each visual complexity value) For each frame
Features Audio classes – 1-s segments – GMM-based classifiers – Silence, ball hit, applause, female speech, male speech, speech and music, music, and noise – Sport highlights detection Face detection – Viola-Jones face detector based on boosting  P. Viola and M. Jones, "Rapid object detection using a boosted cascade of simple features, " In Proc. of IEEE Conference on Computer Vision and Pattern Recognition, Kauai, HI, December 2001.
Features Cut detection – Software tool Webflix Camera motion – Translation parameters and a zoom factor – Camera motion and close-up object motion  Yap-Peng Tan; Saur, D.D.; Kulkami, S.R.; Ramadge, P.J., "Rapid estimation of camera motion from compressed video with application to video annotation, " IEEE Trans. on Circuits and Systems for Video Technology, vol. 0, Feb. 2000, Page(s): 133 –146.
Summarization Method Shot level – Find key frames Local maxima in the face-size curve Local maxima of the camera motion Combine close key frame points as one segment – Adaptive fast playback According to visual complexity Normal playback at highlight points
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