JP2730682B

PURPOSE:To automatically identify a target object moving in a front direction or the like by setting a wide window in the range of wide view including the target object, identifying the target object according to the output of symmetry evaluation in a target window scanning the inside of this wide window, and executing initial setting. CONSTITUTION:Corresponding to the output of a self-vehicle advancing direction angle detector 13, a window setter 12A traces a target vehicle 5 in an advancing direction and automatically sets a wide window 14 of wide view including the trace target vehicle 5, and based on the operation of the window setter 12A, the inside of the wide window 14 is scanned by a target window 18 having (m) rows and (n) columns. The inside of the wide window 14 is continuously scanned by the target window 18 until a picture in the target window 18 comes at the most symmetrical position with the central axis of the target window 18 as a reference, and the object 5 is identified and initially set. Thus, the target object 5 can be automatically identified.