| 摘要 |
On connection of an identification device, a frame timing pulse generator produces timing pulses from a television camera (2) according to the used television standard and the pulses are used by a generator (7) to excite a pulse illuminator (1). The finger (6) of a user is placed on the fibre-optic surface of the television camera and light pulses illuminate the finger, creating a fingerprint image on the photosensitive surface of a device (3), receiving control signals from the camera to form a charge pattern corresponding to the fingerprint image. The television signal from the camera is amplified in a control unit (4) and converted into a standard television signal, which is passed to a personal computer (8), where it is converted into digital form in a video-blaster and is then processed according to the assigned programme. Several sequential frames of the image are analysed and the obtained data are compared to the earlier recorded data of the fingerprint in the computer, to identify the user. |
