A sensor arrangement for recording the movement of an armature on an electromagnetic actuator for operating a control element, in particular for operating a gas exchange valve of an internal combustion engine, has an axially displaceable bar-like sensor piece, made from a soft magnetic material, having a ring of electrically conducting material of low ohmic resistance. A buffer system includes a buffer apparatus and a processing system load port to transfer carriers from the buffer apparatus to a processing system load port. The first processor processes the sensor output in a first manner and generates a first output indicative of the possibility of the presence of an occupant within the vehicle. A raster operations engine may determine whether all the points of the object would have the same value if the raster operation is performed.