Patent ID: 7557835
Filing Date: 2009-07-07
Classification: H04N

Abstract:
1. A method of calibrating at least two video cameras ( 1 , 2 ) relative to each other when said two cameras constitute apparatus for stereoscopically filming ( 3 ) a portion of pathway ( 4 ) suitable for having any type of body traveling therealong, in order to detect the state of occupation of said portion of pathway, and in particular to detect incidents that might occur on said portion of pathway, the method being characterized in that it consists: in placing a plurality of marks on the surface ( in forming a video image of said portion of pathway ( in defining a characteristic point P in determining first and second image lines D in determining a first image meeting point for the first and second image lines D in processing the video signals delivered by each video camera in such a manner that these signals are representative of two images suitable for being processed by stereovision.