I. Iris recognition technology
The appearance of the human eye consists of three parts: the sclera, the iris, and the pupil. The sclera, which is the white part of the eyeball, accounts for about 30% of the total area; the center of the eye is the pupil, which accounts for about 5%; the iris is located between the sclera and the pupil and contains the most abundant texture information, occupying 65%. In appearance, it is composed of many glands, folds, pigment spots, etc. (see Figure 2-1). It is one of the most unique structures in the human body. The formation of the iris is determined by genetics, and the human gene expression determines the morphology, physiology, color and overall appearance of the iris. When a person develops to about the age of two, the iris develops to a sufficient size and enters a relatively stable period. Unless unusual abnormalities, physical or mental trauma, may cause changes in the appearance of the iris, the morphology of the iris can remain unchanged for decades. On the other hand, the iris is visible to the outside but at the same time belongs to the internal tissue behind the cornea. To change the appearance of the iris, very delicate surgery is required and the risk of visual impairment is risked. The uniqueness, stability and immutability of the iris are the material basis for the identity of the iris.
Iris recognition technology combined with the corresponding algorithm can achieve very good accuracy. Even if all humans' iris information is recorded in one data, the possibility of falsification and falsification is quite small. Two different iris information are available. The probability of having 75% of matching information is 1/120,000, and the probability of two different irises producing the same Iris Code is 1/1078, which is several to several tens of degrees higher than that of any other biometric authentication technology. Orders of magnitude.
Table 2-1 Comparison of several biometric technologies
Types of
Technical Parameters
fingerprint
gesture
Facial
sound
Iris
Accuracy
5%
0.2%-2.2%
2.5%
5-10%
0.00008
False acceptance rate
0.0001%
<0.1%
-
0.01%
0.00005%
Wrong rejection rate
2%
0.1%
-
0.1%
0.0001%
Average recognition time
5S
3S
>2S
5-13S
0.6S
Non-invasive
no
no
Yes
Yes
Yes
Non-contact image sampling
no
no
Yes
Yes
Yes
Implementation identification
Most are not
no
Not very effective
no
Yes
Anti-counterfeiting ability
in
in
in
low
very high
Ease of use
in
in
high
in
very high
Is it biometric?
Yes
Yes
Yes
Yes
Yes
ID file size
25-1000
9
4000
1000-10000
512
Second, achieve the goall Personnel Attendance: The number of accurate staff and precise time of commute to effectively prevent others from taking the place of attendance problems;
l One person is engaged: The iris attendance is tied with the downhole mobile positioning system to achieve the uniqueness and accuracy of the downhole personnel, and to integrate people and cards to prevent cheating.
l Central office monitoring: The central office can monitor the accurate attendance information of subordinate enterprise personnel in real time, providing powerful guarantee for scientific and efficient management.
Third, the basic workflow of the systemThe mine personnel safety monitoring system was entered through “basic information†and the “iris information†was registered and submitted for official use. Under normal circumstances, the ground personnel and personnel entering and exiting the mine rely on the on-site identification unit and the attendance management unit to complete mine shaft entry personnel attendance and the biometric prompting function of the well personnel.
When the underground staff has overtime work or accidents (the normal working time can be set according to the relevant regulations), the attendance management unit automatically sends an alarm signal to the remote display unit. After the remote display unit receives the alarm signal, it automatically or manually The master control system issues an alarm verification. If confirmed, the remote display unit records, statistics, sends an alarm signal to the remote terminal subsystem, and sends corresponding guidance information to the corresponding mine. Otherwise, the system performs fault-tolerant processing.
Fourth, the eye of a common management system featuresOne-click installation
Only need to provide bare metal with WINDOWS operating system, you can install the entire universal time and attendance system, including the establishment of the operating environment. No need to configure a cumbersome program execution environment, all the way to NEXT installation takes only 1 minute.
2. Reports are generated automatically
The operator can generate a report containing the corresponding content according to his own needs. Not only reduce the workload of developers, but also be flexible to generate reports.
3. Database common procedures
Attendance general procedures are applicable to existing database management systems. If the client has already installed database management software, it can be mounted with simple configuration parameters without the need for repeated installation. Attendance common system cross-database platform common.
4. Iris registration speed
The average person's information from the input to the iris preservation is only 5 seconds, and the iris is continuously registered and has high efficiency.
5. System stability
Iris recognizer status switching is accurate and stable. Support multiple users access at the same time. After rigorous stress testing, data processing is precise and fault tolerance is strong. Long-term operation will not generate spam data or system crashes.
6. Attendance equipment common platform
Whether the front-end acquisition device uses a punch, fingerprints, palm veins, or irises, it can be attached to a universal attendance platform. Achieve common across-device-independent universal systems for attendance and front-end acquisition devices.
7. Real-time device status refresh
The attendance common system refreshes the connection status of the front-end acquisition device in real time so that the operator can find the abnormality and deal with it in time. Effective control of front-end acquisition equipment completely eliminates disconnection between software and hardware.
8, iris recognition through, real-time display corresponding personnel photos, job number, name, and other multiple information.
9. Perfect combination with downhole mobile positioning, personnel, and payroll management systems
Bind with the mobile positioning system interface in real time, providing personnel, payroll management system interface, so that system resources are shared, to achieve a data collection, multiple management system applications.
Static var generator cabinet takes DSP as the core, connects the self-changing bridge circuit in parallel with the power grid through the reactor, adopts the real-time data acquisition technology and dynamic tracking technology to detect the grid voltage and current information, and calculates the grid voltage and current through the internal DSP calculation. After that, the reactive power component of the load current is extracted, and then the PWM signal is driven to drive the IGBT, and the three-level topology circuit is controlled according to the reactive current to generate a reactive current that meets the requirements, so as to achieve the purpose of reactive power compensation.
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