Will we pay using our fingerprint, or enter a building just touching a sensor? Does our mobile phone recognize our fingerprint? It is possible, as far as Dutch PhD student Asker Bazen is concerned. He has improved the verification techniques, resulting in a better result even for deformed and damaged prints. Together with a higher speed, the new methods can take away existing reserves for implementing fingerprint verification. Bazen is finishing his PhD research at the faculty of Electrical Engineering of the University of Twente, on September 18. Of all biometric methods, fingerprints are the most practical, is the conviction of Bazen: it can be done with a simple sensor that is coupled in a smart way with a database. Including the system in a mobile device like a cell phone is no problem in the near future. Iris-detection is another possibility of detection: it is extremely reliable but you need a sophisticated and fairly large camera.
Recognizing fingerprint is a complex problem for image recognition experts. The optical or capacitive sensor turns the fingerprint into a grayscale image: a black and white picture. Put the picture over a picture in the database, you would say, and you see if both print match. In practice, this turns out to be far less easy: this only works for fingerprints that are purely identical, and are saved in the database in exactly the same way. But there are numerous factors modifying the print. The policeman has a ‘flat’ print in his database, while he finds a print on a round whisky glass at the crime scene. Someone with wet or cold fingers has a slightly different fingerprint than someone with dry fingers.
Ridges and valleys Asker Bazen therefore wants to digitally re-shape the picture slightly, for an elastic fit with the picture in the database. Shrink it a little bit here, and stretch them in other places. He therefore uses recognition of the minutiae. A fingerprint consists of ridges and valleys. Where they end or split up, the minutiae are found. Every fingerprint has between twenty and fifty of them. By matching the minutiae of both prints, a new drawing grid is constructed, compensating for elastic deformation.
One of the existing problems is the processing time, especially for databases containing thousands of prints. Ideally, recognition must take place in ‘real time’. The user doesn’t want to wait or get five or six error messages before being admitted. On the other hand, an intruder must not be allowed to get in easily. Bazen mentions the black list problem, in which a small group of people is not allowed in,, e.g. football hooligan. “In that case you have a small database of people not to be admitted. You don’t want people to be able to manipulate their print in order to enter a stadium without a permit.“
In his thesis, he concludes that elastic matching is very promising, but Bazen also found a method that may be more competitive in terms of speed. It uses the main angles of the lines in the fingerprint. Four ‘cloudy’ pictures indicate the concentration of the four main angles (0, 45, 90, 135 degrees). “We always assumed that this is just a way for a first rough evaluation, but the end result is promising as well. Error percentage is going down to about 0.5 percent, with a good chance of still improving this drastically. At the same time, the speed is about 100 times higher.”
With an early version of his elastic method, Bazen in the international Fingerprint Verification Competition. He then already ended in the upper regions. His refined version has been sent to the 2002 edition of FVC. “I expect a lot of it. This technique is better than two years ago. The higher speed is a major advantage as well.”
The good old ink-and-sheets method in this way gets a full digital follow-up. The improvements Bazen, are very good for improving user acceptance. Acceptance is in fact the true bottleneck for replacing part of the PIN-passes and keys. Improved performance and speed are the only way to gain this acceptance. The sensor itself was not part of Bazen’s research. There are flexible and cheap sensors on the market, he says.
Asker Bazen MscEE defends his PhD-thesis on September 18. His promotors are prof.dr. C.H. Slump and prof.dr.-ing. O. Hermann. Comparative illustrations are available.
Press contact: University of Twente, Corporate Communication, Wiebe van der Veen, tel +31 53 4894244, e-mail email@example.com
Wiebe van der Veen | AlphaGalileo
New manufacturing process for SiC power devices opens market to more competition
14.09.2017 | North Carolina State University
Quick, Precise, but not Cold
17.05.2017 | Fraunhofer-Institut für Lasertechnik ILT
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
17.10.2017 | Life Sciences
17.10.2017 | Life Sciences
17.10.2017 | Earth Sciences