FIELD: physics.
SUBSTANCE: device comprises first means (33) of detecting three-dimensional objects based on a captured image, means (34) of detecting light sources, which is situated behind the investigated vehicle, second means (35) of detecting three-dimensional objects based on a light source, means (37) of evaluating three-dimensional objects for evaluating whether or not a three-dimensional object is a vehicle situated in an adjacent lane, means (38) of calculating degree of blur for calculating the degree of lens blur and control means (37) for evaluating whether or a three-dimensional object is a vehicle in an adjacent lane, based at least on the detection result from the second means of detecting three-dimensional objects, when the degree of lens blur is equal to or greater than a predetermined value and evaluating whether or not a three-dimensional object is a vehicle in an adjacent lane, based on the detection result from at least the first means of detecting three-dimensional objects, when the degree of lens blur is less than the determination value.
EFFECT: improved safety owing to timely detection of a vehicle in an adjacent lane.
17 cl, 24 dwg, 3 tbl
