With the fast development of information technology, especially the promotion of computer internet and mobile telecommunication technology in the world, it has changed greatly for people to acquire, exchange and process information. Simultaneously, industrialized development also brings new challenge and chance to public security work, the ideal of "asking science and technology for police forces" has entered into people's heart.

With the economic development and social advancement, the public security work is continually meeting many new situations and new problems. The new challenges brought by the social demands day by day, especially the activity, the antagonism and the hiding of the current criminal offense, the more prominence of technological, intellectualized and diversified criminal methods, and the increasing of new domain crime year by year, bring stern test for the public security work.Therefore, choosing the development road of strengthening police with informationized science and technology for the public security work is imperative.

Many law enforcements of public security personnel are all carried on outdoors. In the outdoor law enforcement, the public security personnel often needs the strong function information terminal to realize the information inquiry and alternation, information gathering and processing, crime scene analysis and evidence collection and other assistant law enforcement methods.

The solution aims at solving the above problems: building the onboard centre mobile information platform and providing the informationized service during the law enforcement through establishing the system described in the solution.

This system uses onboard computer, which equipped printer, video camera and other external devices as mobile information terminal. Meanwhile, it depends on CDMA wireless network of communications to establish a physical chain connecting onboard computer to command dispatching center. This system can provide various services for policemen, such as vehicle orientation navigation, dispatching command, mobile investigation, violation evidence collection, real time monitoring, over speed evidence collection, etc.

This system uses onboard computer, which equipped printer, video camera and other external devices as mobile information terminal. Meanwhile, it depends on CDMA wireless network of communications to establish a physical chain connecting onboard computer to command dispatching center. The command dispatching center of the public security connects the WEBGIS server, the video server and monitoring terminal through the kilomega exchange.

From the picture above, we can see that the users of this system can be divided into two: the scene law enforcement police and the dispatching commanders of public security’s monitoring center.

Functions for the former:
·Auto navigation
·Positioning Service
·Dispatching information exchange
·Mobile Inspection
·Violation Evidence Collection
·Real Time Supervision
·Over Speed Evidence Collection

Functions for the latter:
·Electronic Fence
·Geography information maintenance
·Video Supervising
·Vehicle Positioning
·Track Playback
·Dispatching and Commanding

The system adopts the lamination modulation system design. The technology base platform provides foundation software such as GIS, data base, WEB, middleware, etc, providing the movement strut environment for the application product. After system integration of these products (onboard computer, mobile electron police terminal, WEBGIS dispatching navigation system, video frequency supervision system), the public security solution can be established, taking onboard computer as the core and facing the motion public security law enforcement personnel and the command dispatching men of public security monitoring center.

Onboard information system (onboard computer) combines the automobile electron and inserted computer technology, applies the computer technology to the automobile-the special application environment, lets the computer and the automobile's electric power, sensor and its related control signal connect, forming a general and open information processing platform; it provides many functions, such as GPS positioning navigation, digital instrument, failure detection, wireless network communication, multimedia entertainment, etc, promoting information level of the automobile and the security and entertainment of driving.

It's a kind of network geography information technology with brand-new structure pattern. The system structural design emphases the displaying and the processing ability of computer itself; Using the network programming tool Java language development, operating procedure lower than 100kb is advantageous for the network transmission, the whole system uses the distributional processing pattern of the customer and the server end, the multi- vectors data stream solution solves the question of transmitting the magnanimous data in the narrow band, which greatly enhance the customers' visiting speed and reduce the system investment cost. It separately provides secondary development port in the customer and the server end.

License Plate Recognition, shortened as LPR, is a specialized computer vision system taking the specific goal as the object, which can automatically withdraw the car license image from a picture, automatically divide the character, then carries on the recognition to the character. The method which utilizes the pattern recognition, the artificial intelligent technology to analyze the gathered automobile picture can accurately automatically recognize the real-time car license number, the letter and the Chinese character, and give the recognition result by the data form which can be directly operated by the computer, and finally puts the computerized monitoring and management of the vehicles into reality.