ISBN-10: 0120121212

ISBN-13: 9780120121212

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An alternative reflection method, developed by Casio and AlpVision, is a roller with a sensor inside. 5 Fingerprint sensor – rolled 'JOHFS $IBTTJT -JHIUTPVSDF 5SBOTQBSFOU SPMMJOHUVCF 0QUJDBMMFOT *NBHFQJDLVQEFWJDF Source: Jean-François Mainguet Touchless reflection does not require contact between the sensor and the skin surface. The light reflected by the finger ridges is converted into electrical signals in the sensor thus generating an image of the skin surface. This image is encoded and the encoded minutiae are extracted and used for subsequent comparison.

The general directions of the lines of the fingerprint, and the presence of the core and the delta are studied. Several categories have been defined in the Henry system: whorl, right loop, left loop, arch, and tented arch. Most algorithms use minutiae, the specific points like ridges ending, bifurcation, etc. Only the position and direction of these features are stored in the signature for further comparison. Some algorithms count the number of ridges between particular points, generally the minutiae, instead of the distances between them.

At launch Iridian said: It will deliver improved ‘false reject’ performance by reducing the instances where someone who is enrolled in a database is not recognised. In addition, the algorithm sets the stage for the next generation of iris recognition cameras, particularly those that are chip-based and mobile devices, and those that capture pictures of an iris from subjects at a distance and/or in motion. It also prepares for the ability to recognise people from non-ideal iris images. Iris recognition is the only biometric technology initially designed to work in the 1 to n search environment, and is therefore particularly suitable for large-scale national identity databases.

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Advances in Computers, Vol. 21

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