IMAGE FORMING APPARATUS, METHOD FOR IMAGE FORMING, AND METHOD FOR DOCUMENT AUTHENTICATION

摘要

PURPOSE: An image forming apparatus, an image forming method, and a document authentication method are provided to insert a small white spot to the text area of a document and to insert digital data to the document. CONSTITUTION: A communication interface unit(110) is input printing data. A detection unit(140) detects a plurality of areas which have a defined size out of the printing area of inputted printing data. A control unit(190) creates a defined message into a plurality of image patterns. An insertion unit(150) inserts the created image pattern to the detected area. A printing unit(180) prints printing data which the image pattern is inserted to.