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  • To compute second-order motion energy, we computed the Michelson contrast of each point in each movie frame, removed the DC component in each frame by subtracting from the contrast images of each movie frame the mean x–y image of all the movie frames, applied a full-wave rectification (square) on each point of all the resulting images [38][39] and placed all the resulting images at different time points in the three-dimensional (x, y, t) space.
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