Scanner modules are provided for use with a docking station having a docking station interface adapted to receive an interface of an imaging device; the scanner module has an image-scanning unit adapted to form an image of a medium; a controller to controllably cause the image scanning unit to capture an image of the medium and to store the captured image as image data in a memory; and a scanner interface adapted so that it can be received by the docking station interface. The controller is connected to the scanner interface and adapted to send image data from the memory through the docking station interface in a manner that emulates the manner in which the imaging device sends image data through the docking station interface. Some embodiments of the scanner module can be manually or automatically moved to scan mediums.