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I have extracted the optical flow along x and y axes. I want to pass them into a ConvNet. The thing I cannot understand is whether these should be two different input channels or should I combine them in some way, like stacking them, adding them or averaging them

Paper- Two-Stream Convolutional Networks for Action Recognition in Videos

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Stack them so that it is an input with two channels. This is the standard approach.

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  • $\begingroup$ Do you mean the optical flow images will have 6 channels, 3 for each ? $\endgroup$ – userlatebloomer Apr 17 '18 at 8:25
  • $\begingroup$ No, one channel is for the $x$ component of the flow, one channel is for the $y$ component of the flow. There are two channels in total. $\endgroup$ – shimao Apr 17 '18 at 8:58

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