| 摘要 |
<p>PURPOSE:To make print information of printed matter difficult to understand and thereby protect against forgery by processing image data including information corresponding to print data with pattern transformation and storing the transformed data. CONSTITUTION:Image data originating from an image data acquisition device is entered to an image transformation device 14 of an image data processing device 13, and the image transformation device 14 performs, for example, primary fourier transform or secondary Fourier transform processing of entered image data. The transformed image data (concealed information transformed to frequency range data) is stored in data memory for printing 16 and used in the print data processing part of a printing device 17. Consequently, concealed image information is printed in printed matter 21 obtained by the printing device 17. Thus, printed matter which is difficult to forge can be obtained.</p> |
