biometric time clock technology is the most convenient and safe identification technology, do not need to remember complex password, also do not need to carry keys, smart card and things like that. Biological recognition technology that is itself, it doesn't get any better than this team card mode safer, more convenient. Because everyone's biological characteristics different from the others only - sex and in a certain period of time constant stability, is not easy to forge and fake, so use biological recognition technology for identity, safe, reliable and accurate. In addition, biological recognition technology products with the help of modern computer technology to realize, it is easy to cooperate with computer and safety, monitoring, management system integration, automation management. Fingerprint machine and hand shape machine market share is 34% and 26%.

Each person's fingerprints skin texture in the design and fingerprint time clock delivery, breakpoint righteousness point each are not identical, is the only, and lifetime is changeless, rely on the uniqueness and stability, you can take - individual with his fingerprint corresponding up, through his fingerprints and preserved fingerprint comparison, can verify his true identity, this is the fingerprint recognition technology. principle Fingerprint is actually more complex. And artificial processing different, many biological recognition technology companies do not direct memory fingerprint image. For many years in the companies and research institutions have many digital algorithm (the United States relevant laws that fingerprint image belong to personal privacy, therefore cannot directly processing fingerprint image). But the fingerprint identification algorithm finally boil down to find and in fingerprint image than the characteristics of fingerprint.

biometric time clock mainly from the general characteristics and local features two aspects. The E.R.H erry with scholars think, on the local characteristics of the circumstances, as long as than 13 feature point coincidence, it can be identified as the same fingerprint. General characteristics General characteristics are those employing eye can be directly observed characteristics, including grain line, pattern area, it, triangulation point and line number, etc. Grain shape Fingerprint experts in the long-term practice based on the ridge line trend and distribution, the fingerprint is divided into ring (also called bucket type), bow, helical three categories. Other fingerprint pattern are based on the three basic pattern. Just rely on grain shape to distinguish fingerprint is not enough, it's just - a rough classification, through the more detailed classification makes in the database search fingerprint more convenient and quick.

Local features is refers to the fingerprint of nodes on the biometric time clock systems characteristics, these have some characteristics of the node called feature points. Two fingerprint often have the same general characteristics, but their local characteristics - feature points, but could not completely the same. Fingerprint grain is not continuous, smooth straight, but often interrupt, points and or discount. The breakpoint, bifurcation point and turning point is called "feature point". "Feature point" can be subdivided into endpoint, points and point, bifurcation, isolated point, ring point and short grain etc., one of the most typical is the endpoint and bifurcation point. It is these characteristics point provides fingerprint only - sex confirmation.

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