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Luis Herranz , Jose´ M. Martı´nez

On the use of hierarchical prediction structures for efficient summary generation of H.264/AVC bitstreams. Luis Herranz , Jose´ M. Martı´nez. Image Communication 2009. Outline. Introduction System Framework Skimming Unit (SU) Coding order Generation of the summary

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Luis Herranz , Jose´ M. Martı´nez

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  1. On the use of hierarchical prediction structures for efficient summary generation of H.264/AVC bitstreams Luis Herranz, Jose´ M. Martı´nez Image Communication 2009

  2. Outline • Introduction • System Framework • Skimming Unit (SU) • Coding order • Generation of the summary • Presentation of the summary • Experiment

  3. Introduction • MPEG-2 prediction structure

  4. Introduction • Hierarchical prediction structure in H.264/AVC using P frames (delay 0)

  5. Introduction • Hierarchical prediction structure in H.264/AVC using B frames (delay 8)

  6. System Framework Analyzing input bitstream Generating the summarized bitstream Skimming unit (SU) -The selection of SUs-Temporal level # frames selected

  7. Skimming Units Temporal layer 1 Index Skimming Unit (SU)

  8. Skimming Units Overlapped SUs

  9. Generation of the Summary • Bit stream adaptation guided by skimming parameters

  10. Presentation of the Summary • Constant frame rate • Variable frame rate • Signaling the changes of frame rate • Using a predefined set of SPSs

  11. Summarization Modalities • Image storyboard: • Video Skim: • Frame dropping • Fast preview Frame selection Skimming curve

  12. Image Storyboard • Clustered using K-means algorithm

  13. Video Skimming • Face detection • Moving median filter (a) Frames with face detected (b) Skimming parameters -- 32 frames per GOP (c) Skimming parameters -- 2 frames per GOP

  14. Fast Preview • Motion activity • Median filter (a) Filtered activity (b) Skimming parameters -- 32 frames GOP (c) Skimming parameters -- 2 frames GOP

  15. Subjective Evaluation Visual distortion Semantic distortion

  16. Performance Evaluation • Coding efficiency and processing time

  17. Performance Evaluation • Bit stream extraction • Low computational cost • Faster generation of the bit stream

  18. storyboard skim Fast playback

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