Video Information Retrieval (3)

• Gauch, "The Digital Video Library System: Vision and Design,"1994
• 100 hours of video from CNN news, "Nature" of WNET, "Nova" of WGBH
• Storage system:
  • 640*480, 30 frames/sec. 108,000/hr, 66GB/hr, 317 MB audio, ==> 660GB/100hr
  • 500 min. video for 20 users per hour ==> 25--35 MB/second
• Video processing system:
  • semi-automatic video segmentation
  • speech recognition of audio track
  • optical recognition of caption and transcript
  • insertion of structured data (metadata)
• User interface
  • allow free-text searching on indices built from speech recognition, caption and transcript, and Boolean searching on structured data from keywords, video source
  • flexible display of search results: from textual description, audio only data, key frames, postage stamp version, and full resolution video

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