| 摘要 |
PURPOSE:To prevent the original image of an original from being easily discriminated even if this original is copied. CONSTITUTION:A synthesizing circuit works when an ADD signal is equal to logic '1' together with the value of a CNO signal defined as '2' CNO<0>='0' and CNO<1>='1' and the print output color equal to yellow Y respectively. An image signal B is turned into an output Q through a delay circuit 505 and a selector 506 only at all times except when the synthesizing circuit is working. Meanwhile the image data obtained in a synthesizing mode are first stored in the memories 502 and 503 and then read out through each prescribed set address. These read data are inputted to an adder circuit 504 to be added together and turned into an output Q through the selector 506. Then the data on the green G of the image of a strictly confidential document are synthesized with the data on the blue B of the original used for a camouflage at a synthesizing part 417. The synthesized data Q are inputted to a log converter 405, and the density signal of the yellow Y is outputted for the synthesized image data. |
