Patent ID: 7536035
Filing Date: 2009-05-19
Classification: G06T,G08G

Abstract:
1. An object velocity measuring apparatus for measuring an object velocity in a photographic field from a plurality of photographic frames made up of a plurality of pixels, the object velocity measuring apparatus comprising: an object area extracting unit configured to extract, as an object area, a set of pixels from which an object has been sensed over at least M (M<N) of N successive frames including the present frame; a center-of-gravity computing unit configured to calculate the center-of-gravity position coordinates of the extracted object area in the photographic field; and a velocity computing unit configured to calculate the object velocity from the movement of the calculated center-of-gravity position coordinates between different frames, wherein the center-of-gravity computing unit, when the object area corresponding to the same object is separated into a plurality of segments, calculates the weighted mean of the center-of-gravity position coordinates of each segment, using the area of each segment in the photographic field as a weight, and determines the center-of-gravity position coordinates of the object area in the photographic field.