EURion constellation
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This article may contain original research. Please improve it by verifying the claims made and adding references. Statements consisting only of original research may be removed. More details may be available on the talk page. (June 2009) |
The EURion constellation is a pattern of symbols found on a number of banknote designs worldwide since about 1996. It is added to help software detect the presence of a banknote in a digital image. Such software can then block the user from reproducing banknotes to prevent counterfeiting using colour photocopiers. However, recent research shows that the EURion constellation may just be one of many factors used to detect currency, and is not necessarily required.[1]
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[edit] Description
The name "EURion constellation" was coined by Markus Kuhn, who uncovered the pattern in early 2002 while experimenting with a Xerox colour photocopier that refused to reproduce banknotes.[2] The word is a portmanteau of EUR, the euro's ISO 4217 designation, and Orion, a constellation of similar shape.
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. Andrew Steer later noted simple integer ratios between the squared distances of nearby circles, which gives further clues as to how the pattern is meant to be detected efficiently by image-processing software.
The EURion constellation is most prominent and was therefore first recognised on the 10 euro banknote.
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 the front of former Bank of England Elgar £20 notes, they appear as green heads of musical notes, however on the Smith £20 notes of 2007 the circles merely cluster around the '£20' text. On some U.S. bills, they appear as the digit zero in small, yellow numbers matching the value of the note.
Technical details regarding the EURion constellation are kept secret by its inventors and users. A patent application[3] suggests that the pattern and detection algorithm were designed at OMRON Corporation, a Japanese electronics company. It is also not clear whether the feature has any official name. The term "Omron anti-photocopying feature" appeared in an August 2005 press release by the Reserve Bank of India.[4] In 2007 it was picked up in an award announcement by a banknote collectors society.[5]
[edit] Usage
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The following table lists the banknotes on which the EURion constellation has been found so far:
| Currency | Notes with EURion constellation | Notes without EURion constellation |
|---|---|---|
| Armenian dram | 1000 dram (2001 and 2011), 5000 dram (2003), 10,000 dram (2003), 20,000 (2007 and 2009), 100,000 dram (2009) | 20,000 and commemorative 50,000 dram |
| Aruban florin | All (2003) | |
| Austrian schilling | 500 and 1000 schilling (1997) | 20, 50, 100, and 5000 schilling |
| Australian dollar | Commemorative $5 (2001) | Regular banknotes |
| Belgian franc | 500 francs (1998), 1000 francs (1997), 10,000 francs (1997) | 100, 200, and 2000 francs |
| British pound (sterling) | Bank of England £5 (2002), £10 (2000), £20 (1999 & 2007), £50 (2011) | £50 (old issue) |
| Bosnia and Herzegovina convertible mark | 200 convertible marka (2002) | 50 feninga, 1, 5, 10, 20, 50, 100 convertible marka |
| Bulgarian lev | All (1999) | |
| Canadian dollar | All (2001), 100 (2011) | |
| CFA franc | All (both West African and Central African, 2003) | |
| Chilean peso | 1000 (2011) 2000 (2010) 5000 (2009), 10,000 (2010), 20,000 (2010) | 1000 and 2000 pesos (old version) |
| Chinese yuan | ¥1 (2004), 2005 revision of ¥5 and above | |
| Comorian franc | All (2005-2006) | 2500 francs |
| Croatian kuna | 5, 10, 20 kuna (2001), 50, 100, and 200 kuna (2002) | 500 and 1000 kuna |
| Czech koruna | 2000 (2007), 1000 (2008), 500 (2009), 5000 (2009) | 50, 100, 500, 1000, 5000 |
| Danish krone | All (1997, 2002 and 2009 series) | |
| Djiboutian franc | 1000 francs (2005), 2000 francs (2008), 10,000 francs (2009) | 2000, 5000, and 10,000 francs (National Bank of Djibouti issue) |
| Dutch guilder | 10 gulden (1997) | 25, 50, 100, 250, 1000 gulden |
| Egyptian pound | LE 5 (2002), LE 10 (2003), LE 20 (2001), LE 50 (2001), LE 100 (2000), LE 200 (2007) | 25 piastres, 50 piastres, LE 1 |
| Euro | All (2002) | |
| Faroese króna | All (2001) | |
| French franc | 100 francs (1997) | 50, 200, and 500 francs |
| German mark | 50, 100, 200 mark (1996–2002) | 5, 10, 20, 500, 1000 mark |
| Hungarian forint | All (2010) | |
| Indian rupee | 50 (2006), 100 (2005) and 500 (2000) rupees (both 2nd edition), 1000 rupees (2000) | 5, 10, 20, 50 rupees (Before 2006), 1st edition of 100 (1996) and 500 (1997) rupees |
| Indonesian rupiah | Rp10,000 (2010); Rp20,000, Rp50,000 and Rp 100,000 (2011) | Rp1000, Rp2000, Rp5000; Rp 10,000 (issued before 21-Jul-2010); Rp 20,000, Rp 50,000 and Rp 100,000 (issued before 31-Oct-2011) |
| Japanese yen | Commemorative ¥2000 (series D, 2000), series E (2004) | |
| Kyrgyzstani som | All (2009-2010) | |
| Macanese pataca | Banco Da China: All (8.12.2003) | |
| Malagasy ariary | 100, 200, 500, 1000 (2004), 2000, 5000, 10,000 (2008) | 2000, 5000, 10,000 ariary |
| Mexican peso | All (2006–2010) | $20 (2002–2007), $50 (1996–2006), $100 (1996–2010), $200 (1996–2008), $500 (1996–2010) |
| Moroccan dirham | All (2002) | |
| Netherlands Antillean gulden | 10, 25, 50, 100 gulden (1998) | 250 gulden (1985) |
| Norwegian krone | All (1999) | |
| Romanian leu | All (1996-2001 paper issue), Commemorative 2000 leu (1999), All (2000-2004 polymer issue), All (2005 revaluation issue) | |
| Saudi riyal | All (2007) | |
| Singapore dollar | All (1999) | |
| South African rand | All (2005) | |
| South Korean won | All (2006/2007/2009) | |
| Slovak koruna | SKK 200, SKK 500, SKK 1000, SKK 5000 | SKK 100, SKK 50, SKK 20 |
| Surinamese dollar | 50 and 100 (2010) | 5, 10, 20 |
| Swazi lilangeni | All (2010) | |
| Swedish krona | Kr 50 (2006), Kr 100 (2001), Kr 500 (2001), Kr 1000 (2006) | Kr 20 |
| Thai baht | ฿50 (2012), ฿100 (2005 and 2010), ฿1000 | ฿20, ฿50, ฿500 |
| Tunisian dinar | 10 dinars (2005), 5 dinars (2008), 50 dinars (2008) | 5, 20, and commemorative 30 dinars |
| Turkish lira | 20,000,000 TL (2001), 2005 and 2009 series | |
| Ugandan shilling | All (2010) | |
| United Arab Emirates dirham | 500 dirhams (2011) | 5, 10, 20, 50, 100, 200, 1000 dirhams |
| United States dollar | $5 (Series 2006), $10 (Series 2004A), $20 (Series 2004), $50 (Series 2004 A), $100 (Series 2009) | $1, $2 |
[edit] Other banknote detection mechanisms
[edit] Counterfeit Deterrence System
Recent versions of image editors such as Adobe Photoshop or Paint Shop Pro refuse to print banknotes. According to Wired.com, the banknote detection code in these applications, called the Counterfeit Deterrence System (CDS), was designed by the Central Bank Counterfeit Deterrence Group and supplied to companies such as Adobe as a binary module.[6] However, experiments by Steven J. Murdoch and others showed that this banknote detection code does not rely on the EURion pattern.[7] It instead detects a digital watermark embedded in the images, developed by Digimarc.[8]
[edit] See also
- Printer steganography, used by colour laser printers to add hidden encoded information to printouts
- Coded Anti-Piracy, an anti-copyright infringement technology which marks each film print of a motion picture with a distinguishing patterns of dots, used as a forensic identifier to identify the source of illegal copies
[edit] References
- ^ http://www.cl.cam.ac.uk/~sjm217/projects/currency/
- ^ Markus Kuhn: The EURion constellation. Security Group presentation, Computer Laboratory, University of Cambridge, 8 February 2002.
- ^ Mitsutaka Katoh, et al.: Image processing device and method for identifying an input image, and copier scanner and printer including same. OMRON Corporation, U.S. Patent 5,845,008.
- ^ Issue of Rs.50 denomination banknotes in Mahatma Gandhi Series with additional/new security features without inset letter in numbering panel bearing the signature of Dr. Y. V. Reddy, Governor, Press Release: 2005-2006/245, G. Raghuraj, Deputy General Manager, Reserve Bank of India, 24 August 2005
- ^ 2007 Bank Note of the Year award: 1,000-franc note from Comoros. International Bank Note Society, 15 October 2007.[dead link]
- ^ Ulbrich, Chris, "Currency Detector Easy to Defeat, 14 January 2004.
- ^ Steven J. Murdoch: Software Detection of Currency, 2004.
- ^ Digimarc: SEC Filing, Form S-1/A, Exhibit 10.9, Counterfeit Deterrence System Development and License Agreement, 24 November 1999.
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