Methods and systems for watermark processing of line art images
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 20, 2003
Grant Date -
N/A
app pub date -
Jul 27, 2000
filing date -
May 8, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Binary data is embedded in banknote artwork, permitting later recovery by, and control of, compliant devices that may encounter banknote image data, such as photocopiers, scanners, and printers. One embedding method involves providing nominal line art for the banknote, and imposing a virtual grid of points over the art, thereby defining plural regions. The luminance of at least certain of these regions is changed to effect encoding of the binary data. The luminance may be changed, e.g., by changing the width or spacing of the artwork lines, or by introducing new lines into the artwork.
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Cited Art Landscape
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