1. A system for previewing and imaging a document, the system comprising: an imaging unit comprising: an imaging surface configured to receive the document thereon; an image sensing member configured to capture an image corresponding to the document during an imaging operation; and an image processing member communicably coupled to the image sensing member to receive the captured image, the image processing member further configured to: convert the captured image to a digital data format, detect a position of the document, and compare the detected position with an optimal position for the document; and a display unit communicably coupled to the image processing member, the display unit comprising a user interface for displaying a placement-guiding display object over the converted captured image relative to the imaging surface, and if the imaging processing member determines that the detected position fails to match the optimal position, for displaying on the user interface a series of frames that depicts a movement of the placement-guiding display object from the detected position to the optimal position.