FIELD: physics.
SUBSTANCE: device comprises: a detection region specifying module 41 for specifying a detection region behind on the right side and the left side of a vehicle; three-dimensional object detecting modules 33, 37 for detecting a three-dimensional object present in the right-side detection region A1 or the left-side detection region A2 behind the vehicle, based on image information from a camera 10 behind the vehicle; a three-dimensional object evaluation module 34 for determining whether or not a detected three-dimensional object is another vehicle VX which is present in the right-side detection region A1 or the left-side detection region A2. The detection region specifying module 41, when a wet lens condition is detected, alters the position of the first detection region, which is first specified as the detection region, such that said region does not include a white road marking line display region on the side of the traffic lane of the vehicle from a number of white road marking lines in adjacent traffic lanes, which are adjacent to the traffic lane in which the vehicle is travelling, and specifies a second detection region as the new detection regions A1, A2.
EFFECT: safer movement owing to accurate reflection of the real environment on the road.
13 cl, 28 dwg
