EURion constellation

The EURion constellation (also known as Omron rings or doughnuts) is a pattern of symbols incorporated into a number of secure documents such as banknotes, cheques, and ownership title certificate designs worldwide since about 1996. It is added to help imaging software to detect the presence of such a document in a digital image, or scanners to detect such a document being scanned. The software or scanner can then block the user from reproducing such documents to prevent counterfeiting using color photocopiers.

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