Second, the time and attendance systems structure 1, fingerprint acquisition equipment The most commonly used take like equipment is divided into two categories: optical, crystal sensor. Optical take like equipment has the long history, can be traced back to the 1970 s. Optical take like equipment based on the light's total reflection principle (FTIR). The light to pressure have fingerprint glass surface, reflex the light by CCD to get, and the amount of reflected light depends on the pressure in the glass surface fingerprint ridge and depth and skin and glass between oil and water. Light through glass shot to the valley after the place in the glass and air interface happen total reflection, the light is reflected to the CCD, and into ridge light does not occur total reflection, but by ridge and glass contact surface absorption or diffuse to other places, so in the CCD is formed on the fingerprint image.

fingerprint time clock background http://irene2011.soup.io/post/294460362/In-the-safety-fingerprint-time-clock-informationknowledgehttp://irene2011.soup.io/post/294460362/In-the-safety-fingerprint-time-clock-information Our palms and fingers, feet, toes medial surface skin rough and uneven produce lines will form all kinds of design. The existence of these grain increased at the surface of the skin friction, so that we can use hand to grab the weight. People also pay attention to, including fingerprint, the skin texture in the pattern, breakpoint and crossing each are not identical, that is to say, is the only. Rely on this uniqueness, we can put a man with his fingerprint corresponding up, through to his fingerprints and preserved fingerprint comparison, it can be used to verify his true identity. This depend on human body characteristic to carry out identity verification technology, called biological recognition technology, fingerprint recognition is a kind of biological recognition technology.


At present, from a practical point of view, biometric time clock systems is superior to others biological recognition technology identification method. This is because the fingerprint each are not identical, lifelong fundamental characteristics have been recognized. The earliest fingerprint recognition system application and the police criminal suspects detection, there have been more than 30 years of history, the fingerprint identification of research and practice have laid a good technical basis. Especially now fingerprint identification system has reached the operation is convenient, accurate and reliable, price moderate stage, is gradually applied in civil market.


time and attendance systems through the special photoelectric conversion equipment and computer image processing technology, the living fingerprint acquisition, analysis and comparison, we can quickly and accurately identify the personal identity. General system mainly includes the fingerprint image acquisition, fingerprint image processing, feature extraction, feature value of the comparison and matching process. Modern electronic integrated manufacturing technology makes the fingerprint image reading and processing equipment miniaturization, and at the same time, the rapid development of the personal computer arithmetic speed provides in the single computer and even can fingerprint than the possibility of operation, and good fingerprint processing and matching algorithm to ensure the accuracy of the results. Automatic fingerprint identification technology is from science fiction and Hollywood movie into our real life, maybe one day, you don't have to carry that a bunch of keys, just a click of the fingers, the door will open; Also don't have to remember that annoying password, using fingerprint can drawings, computer login. Believe this one day, not too far away.

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