In this design, CXD3142R is used to realize a high-efficiency, high-reliability, and high-security monitoring system, which realizes the collection, recording, and motion detection of remote information, which satisfies the intelligent management of the community.
1 System requirements analysis
Under the premise of meeting the national electrical standards and user requirements, the design scheme of this monitoring system builds an advanced security system based on the principles of advanced, mature, safe, high-performance price ratio and easy expansion. The monitoring system must ensure 24 hours of continuous operation without interruption. For this reason, the stability and reliability of the system and the ease of maintenance are highlighted in the system design.
The equipment parts are standardized and modular in design, and have a good substitution; the equipment installation parts adopt the plug-in method, which is easy to maintain. In order to ensure the clarity of the image, the subjective evaluation of all the image quality of the front-end equipment should reach level 4 or higher.
2 Overall design of the system
2.1 The hardware department of the system
In order to realize the relative automation of the monitoring in the controlled area and ensure the high security of the surrounding environment of the controlled area, the entire system has deployed 32 monitoring points. Among them, an infrared integrated zoom camera with a gimbal and an infrared integrated camera are set up at the entrance and exit of the community. An infrared integrated camera and a spherical gimbal are set up around the main intersections and surrounding walls of the community, and one dedicated for each elevator There are 2 cameras in total, and 2 ball heads and multiple fixed infrared cameras are set up in the parking lot.
The control room system equipment mainly includes: 16-channel hard disk video recorder and CRT color display. A series of control and management functions such as PTZ control, surveillance arming, and video recording are completed by the hard disk recorder.
2.2 Overall block diagram design
The overall block diagram of this monitoring system is shown in Figure 1. The CXD3142R in the system is a monolithic large-scale integrated circuit that can decode four-color coding CCDs of yellow, cyan, magenta, and green. In addition to the basic video signal processing function circuit, it also has the functions of automatic exposure, white balance detection circuit, synchronization signal generation circuit and peripheral synchronization circuit. Its biggest feature is that the built-in microprocessor can recognize basic video functions without the need for an additional processor. At the same time, it is also equipped with a time-base matching circuit with a maximum 510-line CCD and a signal detection and processing circuit for brightness / chroma.
As shown in Figure 1, real-time monitoring image data is converted from a CCD to a YUV signal in digital format via CXD3142R. This digital signal is packaged and processed by an external MCU, encapsulated into TCP / IP data, and sent to DVR, thereby realizing network monitoring and recording functions. At the same time, video parameters can be set by PC through RS 232 and saved in E2PROM.
3 Implementation of monitoring system
3.1 Main interface design
In the interface design, the user's ease of use is mainly considered, and a beautiful and easy-to-use interface is designed. The main interface of the system is shown in Figure 2. The user name and password need to be set for the first login to prevent illegal users from logging into the system.
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