[Column] Artificial Intelligence V

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Video and AI 
  1. video understanding / frame / persistence of vision. 
  2. one more dimension than figure - time.
  3. I (x,y,t)
  4. action / action recognition 
  5. challenges of action recognition 
    1. background noise : filming distance , light (rightness), angle, shadow lots of noise 
    2. same stuff but different meaning (shaving bears)
    3. not significant , can not be clearly defined (eating foods)
    4. less data (13320 videos in youtube , 14000 thousands figures in ImageNet )
  6. How to defined features for video AI ?
    1. motion 
    2. OPTICAL FLOW - 3D motion's projection.

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