nif:isString
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Supposing that we know the value of a function E(x, y, t) determining the brightness of any point (x, y) in the (fixed) 2-dimensional domain D recorded in the video, at any time t ∈ [0, Tmax] during recording and considering a point following a trajectory (x(t), y(t)) in D, if this point maintains its brightness along the entire time interval, the value of E(x(t), y(t), t) remains constant for any t ∈ [0, Tmax].
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