What are the problems with high-speed railways in high-definition video surveillance applications?

"Let's see it more clearly", which is already a very urgent demand put forward by many users when using digital video surveillance systems. From the point of view of users, 90% of users think that the resolution of video is actually more important than real-time preview. Affected by various objective factors, security personnel cannot obtain important video information at the first time, and quick query of post-event video is required. And the quality of clear playback is even more important. At present, the horizontal resolution of the analog camera has reached a limit. The 650-line color camera and the 700-line black and white camera are the highest resolution that the analog camera can achieve. For high-definition cameras, the horizontal resolution of 700 lines is very easy, and reaching 1000 lines of video resolution is not difficult.

High-definition video surveillance system brings high definition and sharpness, but also brings a series of real problems, because: Although the front-end camera equipment can meet high-definition, but the front-end "high-definition" does not represent the entire video surveillance system "HD "Because of the doubling of the amount of front-end video information, it will surely bring greater changes to the video encoding, transmission, and storage systems. Because the HD video surveillance system is a system solution, it cannot be represented by a high-definition video camera. At the same time, it will also bring about the growth of demand for computing, transmission, exchange, and storage and technological change in the entire industry chain. The real high-definition monitoring system should consider high-definition from the entire monitoring system, including front-end video source acquisition, video signal encoding and compression, video signal transmission, video browsing, video file playback and other aspects of full support for high-definition monitoring.

For users, HD only makes sense when it includes front-end, platform, storage, browsing, and display. In the process of high-speed rail video surveillance system migration to high-definition, it also faces similar problems. The larger the video resolution and the higher the resolution, the greater the code stream when data is transmitted, which increases the network bandwidth pressure. At the same time, the doubling of data traffic increases the amount of data storage. Taking 720P as an example, the video stream at 25 frames/second is between 500K and 3Mbps, and the storage space per hour is about 1G-2G, regardless of the storage pressure. The cost is still huge in terms of space. In addition, the requirements for central control, management software and hardware performance of high-definition video have also exponentially increased. The same is true for the management of the video image recording and post-analysis workload. These problems are the application of high-definition video surveillance systems in high-speed railways. The problem that must be solved.