DTERMINING OCCUPANCY OF A REGION MONITORED BY A VIDEO APPARATUS

摘要

The method comprises the steps of marking a background surface (10) of the region (11) with a well-defined pattern of markings (14); recording an image of the region using the video apparatus (12, 13) and producing a video signal embodying the recorded image; and using the video apparatus (13) to analyze the video signal embodying the recorded image in order to determine occupation of the monitored region (11) by an object. The video apparatus (13) determines occupation of the monitored region by determining from the video signal embodying the recorded image an obscuring of the marked well-defined pattern (14) by a silhouette of the object. The video apparatus (13) determines an obscuring of markings of the pattern (14) by transforming the video signal to obtain a signal indicative of at least a part of a frequency spectrum of the video signal.