Abstract: The communications system (12) between the video image acquisition unit (14) and the on-board computer (16) includes means for transmitting data by carrier current comprising a data transmission line (20) forming a circuit for electrically powering members of the motor vehicle. The system (12) further comprises first means (22) for putting a video data set into the form of a first digital signal transmitted on a first set of carrier frequencies, and second means (24) for putting a control data set into the form of a second digital signal transmitted on a second set of carrier frequencies, the number of carrier frequencies in the first set being greater than the number of carrier frequencies in the second set.

Abstract: This device for processing video data (10) comprises at least one video image acquisition unit (14). The unit (14) includes means (32) for generating an initial video image, the video image being defined by a video data set. The device further comprises means for transmitting data between the image acquisition unit (14) and an on-board computer (16), and image-creator means for creating a useful video image from the initial video image. The image-creator means comprise means (34) for adjustably selecting at least a portion of the initial video image, the selected portion constituting at least a portion of the useful image.