View source for EURion constellation

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'''EURion constellation''' (also '''Omron rings''') is a pattern of symbols incorporated into a number of secure documents such as banknotes, checks, and ownership title certificates designs worldwide since about 1996. It is added to help imaging software detect the presence of such a document in a digital image. Such software can then block the user from reproducing banknotes to prevent counterfeiting using colour photocopiers.


It has since been supplanted by [[Counterfeit Deterrence System (CDS)]]



== See also ==
* [[Watermark (physical)]]


== Links ==
* [https://en.wikipedia.org/wiki/EURion_constellation Wikipedia]
* [https://ryanagibson.com/posts/steganography-intro/#the-eurion-constellation Sample images]
* [https://people.duke.edu/~ng46/collections/steg-eurion-constellation.htm More sample images]


[[Category:Forensics and Law Enforcement]]