Patent ID: 8817275

Claim:
An image forming device comprising: a scanner for scanning a document and obtaining a document image data; a memory; and a controller for controlling said image forming device, said controller including: a first determining unit for determining whether or not said document image data obtained by scanning is a document image data which has been formed from an original document image data by superimposing a loss detection image for determining presence or absence of data loss, said memory storing an information of a loss detection image corresponding to the contents of said loss detection image, said controller further including: a second determining unit for determining whether or not there is data loss in an extracted loss detection image based on a loss detection image extracted from said document image data and said information of said loss detection image stored in said memory when it is determined that the loss detection image has been superimposed on said original document image data, said image forming device further comprising: a notifying unit for notifying a user of presence of data loss on said obtained document image data based on a result of the determination of whether or not there is data loss in the extracted loss detection image.