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What is the temporal feature in video sequences?
• It refers to the temporal relationships of video events in the time space
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First problem: Markov Process
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Second problem: Hidden Markov Model
• Construct a model to explain a time sequence of events
• Use the model to identify other observation sequence
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HMM Elements
1. Observation sequence: O={O1,O2,…,OT}
2. Hidden states: S={S1,S2,…,SN}
3. State transition probability A={aij}
4. Observation probability B={bij}
5. Initial state distributionNitatsii 1],Pr[ 1
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Chromaticity removes shading and magnitude:
),/( BGRRr )/( BGRGg
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Observable State Sequence for a given video
• Temporal keyframe-based Summarized Video (TSV)– Efficient
– Removing frame noise
… ...
Video frame sequence
TSV