April 12, 2023
The video surveillance system has become an important security measure. After 15 years of continuous synthesis of Shanghai Tiansong's monitoring installation and construction experience, video surveillance system technology is divided into four categories to adapt to modern video development. Technology and Internet The combined application of communication technology improves technology of recording, transmitting and converting images, promotes development of video surveillance system, and ensures smooth and stable operation of security monitoring system.
The video surveillance system is mainly designed to record and store external monitoring images and transmit them to security personnel. On this basis, advanced video surveillance system can remotely control surveillance device, link alarm system, and send an alarm trigger and communication.
Currently, following four aspects of key video technologies in video surveillance system are mainly discussed:
1. Infrared thermal imaging technology
Surveillance cameras can track images that are invisible to naked eye due to use of infrared rays. Using infrared imaging principle technology, this infrared image is called a thermal image to detect night targets such as night, and through photoelectric conversion, signal processing and other means, a device that converts target object temperature distribution image into a video image is called an infrared thermal imager. Infrared imaging can play an important role in following areas:
1. Application monitoring at night and in poor visibility
2. Smoke and fire monitoring
3. Recognition of hidden and camouflaged targets
Thermal imaging monitoring
2. Image Sensor Technology
The main part of video surveillance system is distribution of video images. For reading images from surveillance cameras, transition from CCD to CMOS has its advantages and disadvantages. Compared with CCD-based sensors, integration of CMOS sensors The accuracy is higher because CMOS sensor integrates many peripheral processing functions, it requires fewer components than CCD sensor, and power consumption of CMOS sensor is much lower. From a system-wide perspective, CMOS sensors can significantly reduce cost.
However, CCD has neither ability to record image data, nor ability to permanently store it, nor even ability to "exposure". CMOS processing can also be used as a photosensitive sensor in a digital camera, which can greatly reduce costs.
3. Video display technology for intelligent monitoring
Intelligent video processing technology has a certain analysis function that implements artificial intelligence to establish relationship between images and image descriptions, so as to perform image analysis and processing, and automatically analyze and extract key information from video sources. Help people perform automatic identification and reduce manual labor.
Fourth, media streaming technology
Storing and playing monitoring images are two main elements, on one hand to ensure smooth video playback, and on other hand, to ensure clarity of transmission, we can consider front camera as real-time audio / video. source, and Considering video files as stored audio/video files, a good way to solve this type of problem is to use streaming media technology.
Monitoring streaming media
Through a brief analysis of above technical principles, in order to meet basic requirements of installation and transmission of video surveillance, to standardize installation technology and implementation functions of Shanghai surveillance project, a complete media distribution and scheduling mechanism is needed to ensure efficiency of sending media.
