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Fig. 6. Examples of video frame subtraction. (A,B) Show the subtraction of two
different consecutive frames for the fish in quiet. In A, no movement occurs
between frames and the resulting difference image (column 3) contains only
noise. In B, two fish move resulting in two darker patches in the difference
image. C shows several fish moving in the presence of the stimulus. Note that
in areas where no movement takes place, the noise is small and consistent in
the difference images. Fish are 4.5 mm (16 dpf).
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