| 摘要 |
PURPOSE:To make the workability of a secret ensurance number efficient by printing out a secret security number different from each copy in the case of copying a same original continuously. CONSTITUTION:An analog picture signal outputted from a CCD image sensor 8 is amplified by an amplifier 201, converted into a digital picture data at an A/D converter 202, subject to gamma correction, error spread and dither processing by a picture quality processing section 205 via a correction circuit 203 and a magnification circuit 204 and the result is inputted to a secret number addition circuit 206. The secret security number in the circuit 206 is generated as a character code and synthesized with a signal by the picture quality processing circuit 205. Its output is subject to processing such as half-tone screen, shade and void and a copy output as shown in figure is obtained. Thus, the secret number different from each copy is printed out and the workability of the secret number print is made efficient. |
