fingerprint time clock depend on human body characteristic
fingerprint time clock depend on human body characteristic to verify the identity of a kind of solution. Due to the human body characteristics inherent in the human body not duplicate uniqueness, therefore, the biological key can't copy, stolen or forgotten. With the rapid development of computer technology, people developed a fingerprint identification, voice recognition, face like recognition and so on the many kinds of biological recognition technology, at present a lot of technology has been mature and to application. In the human information interaction, face contains visual information occupied the main position, therefore, biological recognition technology of rookie - surface like recognition technology has more extensive and profound social significance.
Refers to the scene in the time and attendance systems and complex background judge whether there is surface like and separation to like. Its method is divided into: Reference template first design one or several standard face templates, then the test sample and standard template matching degree between, through the threshold value to judge whether there is a face; Face rules face has certain structure distribution characteristics, face rules extraction of these characteristics is generating corresponding rules, to determine whether the test sample contains face; Sample learning adopts the pattern recognition of the artificial neural network method, through the like sample set and the surface like sample set learning produce classifier, Skin model skin model based on surface like color in color space distribution relative centralized rule to detect the Features the son will face all surface like set as a surface like subspace, based on the test sample in subspace projection and the distance between the judge whether there is surface like. The above method in actual system can also be comprehensive use.
The meaning of biometric time clock is very wide, generally can be divided into physical characteristics and behavior features two kinds. The body features include: fingerprints, vein, palm type, retina, iris, body odour, face, and even blood vessels, DNA, bones, etc.; Behavior characteristics, including: the signature, speech, walking gait, etc. Biological identification system, on the biological characteristics of sampling, extraction its unique characteristics into digital code, and further the these code composition feature template, when people with recognition system interaction for identity authentication, recognition system through the gain its characteristics and features in the database template matching, to determine whether the matching, thus decided to accept or reject person.
time and attendance systems to person's fingers end positive skin rough and uneven produce grain line. Grain line regular arrangement form different grain type. The starting point of the lines, the destination, the combining site and the branch point, called the details of the fingerprint feature point. Fingerprint recognition means that by comparing different details of the fingerprint feature point for identification. Because each person's fingerprints are different, the same person is between fingers, fingerprint also have obvious difference, so the fingerprint can be used for identification of identity. Fingerprint identification technology is the most mature and the price cheap biometric identification technology. At present, fingerprint identification technology are widely used, we not only in the entrance guard, attendance system can see the figure of fingerprint identification technology, on the market have more fingerprint recognition application: such as notebook computers, mobile phones, automotive, bank payments can apply fingerprint identification technology.
