Patent ID: 8559051

Claim:
An image processing apparatus comprising: a reader; and a controller, wherein the reader comprises: a conveying unit configured to convey a plurality of documents of different sizes; a reading unit configured to read an image of a document conveyed by the conveying unit; a detecting unit configured to detect a size of a document conveyed by the conveying unit; a notifying unit configured to notify the controller of a document size detected by the detecting unit; and a transmitting unit configured to transmit a document image read by the reading unit to the controller, wherein the controller comprises: a setting unit configured to set an image magnification ratio in accordance with a document size notified by the notifying unit; and a changing unit configured to change magnification of an image transmitted by the transmitting unit, in accordance with a magnification ratio set by the setting unit, and wherein, before the detecting unit detects the document size, the notifying unit notifies the controller of a tentative document size, and when the detecting unit detects the document size, the notifying unit notifies the controller of the document size detected by the detecting unit.