| 摘要 |
PROBLEM TO BE SOLVED: To improve forgery preventing function of a copying machine. SOLUTION: A printer mechanism part 115 is provided with a plurality of process units, wherein images of each color are formed on paper and arranged in series. Delay memories M, C, K delay R, G, B image data by a prescribed time at which data are provided from a scanner 112. A prescribed original document detecting part 125 decides whether an original document image read by the scanner 112 is a prescribed original document and provide a prescribed original document detecting signal SOD to a selector 127, in the case of the prescribed original document. In response to the signal, the selector 127 selects mask data from a mask data holding part 126 and outputs the mask data instead of the R, G, B image data. COPYRIGHT: (C)2004,JPO |
