Electronic information technology and chip technology have evolved in recent years, and network cameras in video surveillance systems have gradually replaced traditional analogue signal cameras in the mainstream of products, owing to their characteristics of network speed, transmission stability, processing efficiency and image quality。
In particular, the poe technology (power over ethernet, ethernet) has matured to provide a stable network data transfer and camera power at the same time with a double winch of more than five or six kinds, making the installation and debugging of web cameras more flexible and increasingly important in security-preventing systems in various types of locations, such as schools, hospitals, hotels, etc。
The rationale for the network camera is that the image signal is entered through the lens, the sound signal is entered through the microphone, it is converted from the image sensor and the sound sensor into a telecommunications number, i. E. The analogue telecommunications number is converted by the ad converter to a digital telecommunications number, coded by the encoder to a certain number of coding standards, and, under the control of the controller, the network server sends the local area network or internet network under a certain network protocol, the controller also receives the alarm signal and sends the alarm signal outside, and sends the control signal as required。
Compared to traditional cameras, webcams have six superior features:
1. Improved image
Network cameras are particularly high in pixels and allow detailed monitoring of suspended particles, suspensions, etc. In air。
2. Mist penetration technology
Network cameras have two types of aerosol-transmitting technology, electronic and optical, and even in special weather situations such as rain and snow fog, they capture high-quality images with high sensitivity。
3. Targeted video intelligence analysis
Network cameras can use their own video intelligence analysis techniques to carry out intelligence analysis in conjunction with the results of monitoring. For example, the colour, blackness, etc. Of the smoke, depending on the colour and blackness of the body, can be effectively identified; combined with floating material on the water body, intelligence analysis of the amount, density, etc. Of floating material on the water body can be performed。
4. Low power, wireless transmission
The network camera itself is less energy-consuming during the specific application, and a battery can be used for several years. Network cameras also function as wireless transmissions, with selective uploading of collected images and videos。
5. Highly corrosive, self-cleaning
Network cameras are inevitably affected by environmental pollution when monitoring the environment. However, network cameras have high dust, water and self-cleaning features, ensuring their effective application。
However, smart webcams may also pose security risks. Privacy protection has become a central and urgent issue for the web-cam industry。
This is a scientific review conducted by choi, a senior teacher at heung an town high school, ishijia。
Xinhua network science and technology department
Cope china-scientific principles
Joint production
