Patent ID: 7430304
Filing Date: 2008-09-30
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 object area extracting unit varies at least one of N and M adaptively according to at least one of the object velocity, the size of the object area in the photographic field, and the frame rate of the photographic frames.