1. A device for monitoring surroundings of a vehicle, comprising: at least one camera; an image processing unit operatively configured to receive an output of the camera; an image display unit operatively configured to receive an output of the image processing unit; wherein the image processing unit is operatively configured to perform image grading for reducing noise components in images recorded by the camera, said image grading averaging a number of images recorded by the camera; and wherein the number of images averaged during the image grading is variable.