A method for monitoring a field of view for visible changes is disclosed. A first image is taken in a predetermined manner of the field of view to be monitored, and then an array divides the first image into a plurality of cells. A second image is taken in the predetermined manner of the field of view...http://www.google.fr/patents/US6335976?utm_source=gb-gplus-shareBrevet US6335976 - System and method for monitoring visible changes
