1. A device for detecting and locating objects comprising a 3-D camera for recording three-dimensional situation images of a space which is to be monitored; first means for evaluating the three-dimensional situation images by means of suitable object detection methods for determining an object which is present in the space which is to be monitored, and for determining the position of the object in the space; a 2-D camera for recording two-dimensional situation images of that region of the space which is to be monitored, in which the position of the object has been determined; and second means for evaluating the two-dimensional situation images by means of suitable object detection methods for redetermining the object which is present in the space which is to be monitored.