1. An image processing apparatus comprising an input port for receiving a projection image of a device acquired while the device resides at a position relative to an object, the object capable of transitioning between at least a first object state and a second object state, and the device being repositionable; an object state determiner configured to determine a current state of the object; a device localizer configured to use image information in the received projection image to determine the position of the device; an object image selector configured to select a contextual object image from a plurality of stored object images organized in groups corresponding to the first object state and the second object state, respectively, wherein at least one group comprises at least two of the object images, and wherein the selected contextual object image i) is from the group that corresponds to the determined current object state and ii) has image information providing highest contrast indicative of the determined device position within the group; and a graphics display generator configured to generate for display on a screen a combined image including a part of the selected contextual object image and the received device projection image.