CS 6825: Motion Part 2 – Optical Flow. Recall: Optical Flow. is an approximation of the 2D motion field. Motion in the world usually occurs in 3D, but, we have a 2D image sensor. So, we see the results as movement across the 2D image plane.
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Taking derivative wrt time:
(Frame spatial gradient)
(derivative across frames)
We want to calculate v= [dx/dt dy/dt]
Can calculate these: Different techniques to figure these out.
DE is the spatial change in brightness in image i
Et is the difference in the brightness at (x,y) between image i and image i+1
The Optical Flow is CONSTRAINED to be on a line !