The amount of information available about urban traffic from aerial video imagery is extremely high. Herewe discuss the collection of such video imagery from a helicopter platform with a low-cost sensor, and thepost-processing used to correct radial distortion in the data and register it. The radial distortion correctionis accomplished using a Harris model. The registration is implemented in a two-step process, using a globallyapplied polyprojective correction model followed by a fine scale local displacement field adjustment. The resultingcleaned-up data is sufficiently well-registered to allow subsequent straight-forward vehicle tracking.
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