Abstract: Disclosed is a video surveillance technique for performing automated surveillance through intelligent video recognition. A distance between two persons is measured from an image captured by a camera. When the measured distance is less than or equal to a reference value, a proximity event occurs. In an embodiment, feet of two persons are detected from an image captured by a camera and a distance between the two persons is calculated using a distance between positions on the ground at which the feet are placed by using camera parameters. In another embodiment, heads of two persons are detected from an image captured by a camera and a distance between the two persons is calculated using a distance between positions of the heads on a plane corresponding to an average height.

Abstract: The present invention relates to a device and method for detecting a three-dimensional object using a plurality of cameras that are capable of simply detecting a three-dimensional object. The device comprises: a planarization unit for planarizing, through homography conversion, each input image obtained by the plurality of cameras; a comparison-area selecting unit for selecting each area to be compared after adjusting the offset of a camera in order to overlay a plurality of images which have been planarized by said planarization unit; a comparison-processing unit for determining whether or not corresponding pixels are identical in the comparison area selected by said comparison-area selecting unit, and generating a single image based on the results of the determination; and an object-detecting unit for detecting a three-dimensional object disposed on the ground by analyzing the form of the single image generated by said comparison-processing unit.