METHOD FOR CALIBRATING AT LEAST TWO VIDEO CAMERAS RELATIVELY TO EACH OTHER FOR STEREOSCOPIC FILMING AND DEVICE THEREFOR

摘要

The invention concerns methods for calibrating at least two video cameras (1, 2) for a stereoscopic device (3). The inventive method is essentially characterized in that it consists in : providing, on the lane portion (4), nine marks of hue other than that of the lane (4), sequenced on a first set of three concurrent virtual straight lines in a first point and distributed in specific manner on a second set of concurrent virtual straight lines in a second point ; forming, with each of the cameras (1, 2) an image of said lane portion (4) ; defining, in each of said two images, one characteristic point of each mark image ; determining, by means of said characteristic points, six concurrent straight line images respectively in two concurrent points ; and processing the video signals delivered by each video camera such that said signals are representative of two images suitable for forming a stereoscopic video image. The invention is particularly useful for determining the occupancy condition of a lane portion and for detecting incidents on said lane portion.