The principle of biometric identification is to use biometric devices to sample biometric features, extract their unique features and convert them into digital codes, and further form these codes into feature templates. When people interact with the identification device for identity authentication, the identification device Get the characteristics and compare them with the feature templates in the database to determine if they match, and then decide to accept or reject the person. Among the many biometric technologies used for authentication, fingerprint recognition technology is currently the most convenient, reliable, non-invasive and inexpensive solution.
Fingerprint recognition technology mainly involves four functional modules: reading fingerprint images, extracting features, saving data and comparing. The image of the human body fingerprint is read by the fingerprint reading device, and then the original image is initially processed to make it clearer, and the fingerprint feature data is established by the fingerprint identification software. The software finds the data points called "nodes" from the fingerprint, that is, the coordinate positions of the bifurcation, termination or looping of the fingerprint lines, and these points have more than 7 unique features at the same time. Usually there are 70 nodes on the average finger, so this method will generate about 500 data. These data are often referred to as templates. A method of fuzzy comparison by computer. Compare the templates of the two fingerprints, calculate their similarity, and finally get the matching results of the two fingerprints.
Ethernet interface circuit module
The AT91SAM7X256 integrates a MAC controller internally to support the MII interface and the RMII interface. RTL820lBL is an industrial grade 10/100 Mb/s low-power Ethernet transceiver with MII interface, 25 MHz clock output, intelligent power-down mode, providing a stable and reliable high-quality network solution for the factory. And other harsh operating environments to set up Ethernet that supports real-time transmission, in line with IEEE802.3u technical standards. The schematic diagram of the Ethernet interface circuit is shown in Figure 2.
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