In a recent meeting of the Changchun video surveillance system construction leadership group, administrative committees from various counties, cities, and districts submitted responsibility letters to the municipal government, setting up a strict "military order" for the city. This marked the launch of the fourth phase of Changchun’s video surveillance system. As an essential part of the security infrastructure, the system is known for its strong preventive capabilities and comprehensive coverage.
Video surveillance has become widely adopted due to its intuitive, convenient, and informative nature. Over time, the development of these systems has shown that they are not only powerful but also highly versatile, with their functions continuously evolving through years of innovation.
For this year’s main tasks in video surveillance system construction, Mayor Jiang Zhiying summarized four key points: "Reform," "Perfect," "Upgrade," and "Expand." Through maintenance, transformation, and integration, the system will be further improved to ensure that monitoring equipment is functional, user-friendly, and effective. The goal is to enhance public surveillance coverage, especially in major traffic areas, key locations, and complex zones. Efforts will also focus on extending the system from urban centers to rural regions.
The platform's functionality will be upgraded to create a centralized command center for the Municipal Public Security Bureau. This will integrate district and county monitoring centers with social monitoring systems, forming a comprehensive network across the city.
Understanding the working principle of video surveillance systems involves breaking them down into seven layers: presentation, control, processing, transmission, execution, support, and acquisition. Each layer plays a unique role in ensuring the system operates efficiently.
The presentation layer is the most visible part, including video walls, monitors, alarms, and automatic call responses. The control layer serves as the core of the system, determining its technological level. It can be analog or digital, with digital control offering greater efficiency and ease of use, though it comes at a higher cost.
The processing layer handles audio and video signals, distributing and amplifying them before sending them to the presentation layer. Transmission is the system's "blood," responsible for carrying signals from one point to another—whether through cables, wireless, or the internet.
The execution layer carries out commands from the control layer, while the support layer provides back-end protection and support for other components. Finally, the acquisition layer includes cameras, lenses, and sensors—the most expensive and critical part of the system, directly affecting image quality and overall performance.
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