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Clockwork	ConvNets for	Video	
Semantic	Segmentation	
2018/02/10
Fully	Convolutional	Networks
The Idea – Adapt FCN to Video Segmentation
• Naïve Idea: segment video frames as still images
• Drawbacks
• Computation redundancy
• Ignoring the	temporal	continuity	inherit
• Two Key observations:
• The speed of motion varies in video.
• Deeper	layers	in	the	feature	hierarchy	change	more	slowly.
Analysis
The Overall Framework
Clockwork ConvNets on Time
Clockwork
• Fix-rated clockwork
• Exponential clockwork: 1, 2, 4, 8, …
• Alternating clockwork: 0, 1, 0, 1
• Adaptive clockwork
• Threshold clockwork:
• Learned clockwork:
Fix-rated Clockwork – translated PASCAL
Adaptive Clockwork – YouTube-Objects
The Idea -- Clockwork
• Hardship in learning Long-term dependencies (Vanishing gradient)
The Clockwork RNN
The End

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Clockwork ConvNets for Video Semantic Segmentation