| 摘要 |
<p>Machine readable data is digitally watermarked into banknotes (16). Such watermarking can be optically sensed (13) and detected by various devices (11). In response, such devices (11) can intervene to prevent banknote reproduction. This arrangement addresses various problems, e.g., the use of digital image editing tools to circumvent other banknote anti-copy systems.</p> |
