Printer output image forming method and forgery preventing method
AssigneeDai Nippon Printing Co., Ltd.
InventorsMitsuhiro Hamashima, Kazuhiro Kawabata, Naoji Shibasaki
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Abstract
Input image data (3) and reproduction-restraining pattern data (2) are combined to obtain composite image data. A composite image represented by the composite image data is printed on an image-receiving sheet (10) by an on-demand printing system. A reproduction-restraining pattern (11) appears when the printed composite image is copied.
Claims14
A printer output image forming method comprising the steps of:
- preparing image data including a background pattern;
- preparing reproduction-restraining pattern data including a reproduction-restraining pattern;
- combining the image data and the reproduction-restraining pattern data to form a composite image data;
- and
- transferring a composite image including the background pattern and the reproduction-restraining pattern on the basis of the composite image data on an image-receiving sheet;
- wherein the transferred composite image is copied such that the reproduction-restraining pattern stands out against the background pattern.
A printer output image forgery preventing method comprising the steps of:
- forming an image having an image pattern on an image-receiving sheet by a thermal transfer printing method;
- and
- superposing a transparent sheet carrying a predetermined discrimination pattern on the image formed on the image-receiving sheet such that the discrimination pattern is caused to appear by a moiré effect of superposition of the predetermined discrimination pattern on the image formed on the image-receiving sheet.
A printer output image forgery preventing method of preventing the forgery of a printer output image formed on a recording sheet by a thermal transfer printing method, using fluorescent colors that cannot be reproduced by ordinary printers for forming the printer output image.
A printer output image forming apparatus comprising:
- a pattern data combining means for combining input image data including a background pattern, and a reproduction-restraining pattern data including that of a reproduction-restraining pattern to obtain a composite image data;
- and
- an output unit that provides the composite image data and prints a composite image including the background pattern and the reproduction-restraining pattern.
Dependencies are inferred from the claim text.