The EURion constellation first described by Kuhn consists of a pattern of five small yellow, green or orange circles, which is repeated across areas of the banknote at different orientations. The mere presence of five of these circles on a page is sufficient for some colour photocopiers to refuse processing. Some banks integrate the constellation tightly with the remaining design of the note. On 50 DM German banknotes , the EURion circles formed the innermost circles in a background pattern of fine concentric circles. On some U. On Japanese yen , these circles sometimes appear as flowers.
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Wikipedia on the EURion Constellation. The "constellation" consists of five circles arranged like the starry constellation of Orion. It is found in different orientations on the paper money of many countries.
The EURion Constellation is intended to prevent color copiers from reproducing images of contemporary currency. This constellation is printed in yellow or variants of green and orange is most visible in the blue-channel of any of the color images. Currency designers have made special efforts to "hide" the pattern in the "look" of the banknote. Adobe PhotoShop and other software also detects images of currency and will not open them. They key in on other patterns more subtle than the constellation.
The algorithms for these other "tests" for currency are not publically known, but are the subject of research by computer scientists. Please email me Swedish Kronor note. Image source: Sveriges Riksbank.
The EURion Constellation in full color. The EURion Constellation enhanced by looking onlyl at the blue-channel. Yellow lines have been added to delineate the constellation.
Click for enlargement. The EURion Constellation in color. The EURion Constellation enhanced by deleting all but the blue-channel and adding yellow lines to delineate the constellation.
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