1. A device for a motor vehicle, comprising: a first camera and a second camera, wherein the first camera and the second camera are configured to at least one of (a) function as a stereo camera for at least a part of a recording of each of the first and second cameras to be simultaneously of a same scene, and (b) produce different images for a same imaging stimulus; and a processor configured to: perform a traffic sign recognition function based on color values of a color image obtained from the first camera and without regard to output of the second camera; perform a night vision support function based on an image obtained from the second camera and without regard to output of the first camera; convert the color image obtained from the first camera into a grayscale image; and perform a driver assistance function, that includes at least one of object recognition, carriageway edge recognition, and lane recognition, based on a combination of the grayscale image and the image obtained from the second camera.