1. A method for monitoring a monitoring region with at least two image sensors, wherein a) a sub-region of the monitoring region is monitored by each of said at least two image sensors by virtue of the fact that each of said at least two image sensors detect objects to be monitored that are localized within said sub-region monitored by said at least two image sensors and data concerning the detected objects are output by each of said at least two image sensors; b) said at least two image sensors are arranged and oriented in such a way that said monitored sub-regions overlap and that each of said objects to be monitored which is situated in the monitoring region is always detected by at least one of said at least two image sensors; and c) a totality of said objects to be monitored in the monitoring region is determined from the data of said at least two image sensors; wherein d) on the basis of the data of said at least two image sensors said objects to be monitored in said overlapping sub-regions which are detected by more than one of said at least two image sensors are assigned to one another by means of a rating of their correspondence in order to determine the totality of said objects to be monitored in the monitoring region.