专业英语指纹识别.ppt

文档介绍：12电信本(1)班
王文琪、王程玉、石胜欧
Fingerprint recognition
History
Women clerical employees of the Los Angeles Police Department being fingerprinted and photographed in 1928.
Application
Access Control System
Attendance System
Computer
Mobile Phone
Identity Card
Define
Fingerprint recognition or fingerprint authentication refers to the automated method of verifying a match between two human fingerprints. Fingerprints are one of many forms of biometrics used to identify individuals and verify their identify.
Principle
Refinement
sampling
Fingerprint sensors
Optical
Ultrasonic
Capacitance
Passive capacitance
Active capacitance
The epidermis layer
The dermis layer
Charge-coupled D)
Optical
RF(Radio Frequency) sensor
RF signal
Ultrasonic
Capacitance
Capacitance
Silicon material
N(i ,j)=
normalized
Effect of fingerprint gamma controller normalization
The processing of fingerprint