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Skeleton fitting for the four situations considered in this paper. We show a sequence for each situation. TTE stands for time to event. TTE = 0 is when the event of interest happens: stopping at the curbside, crossing the curbside, bending, and starting to walk from the curbside. Positive TTE values correspond to frames before the event, negative values to frames after the event. (a) stopping; (b) crossing; (c) bending; (d) starting.
