The concept of matrix comes from the matrix theory in mathematics. To be precise: switch video images from any input channel to any output channel display. One of the most important functions of the video matrix is ​​to implement various switching outputs for the input video image. Generally speaking, an M×N matrix means that it can support both M-channel image input and N-way image output. What needs to be emphasized here is that you must do anything, that is, an arbitrary input and an arbitrary output.
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Difference from traditional matrix
Video matrix has a wide range of applications in the security field. Today, it is mainly divided into two matrix systems in the security field, and the other is the traditional analog video matrix. The other type is a video matrix (IP matrix) based on digital technology. With the rapid development of digital technology in recent years, the improvement of software and hardware levels, thanks to the powerful functions of digital video processing technology, the advantages of digital video matrix gradually emerged.
In order to achieve centralized control of HD-SDI HD cameras, the development of SDI matrix system combines the powerful functions of traditional analog matrix, such as multi-function switching, large capacity, fiber access, network connectivity and Remote Control, character signal superposition; decoding Device interface; alarm interface; and audio control box, control keyboard, support multi-level cascade, multimedia management software platform, electronic map, alarm linkage management. The SDI matrix is ​​developed in the video input and output sections, and the traditional analog input and output boards are changed to digital high-definition SDI boards. Additional features are developed on this basis. The simulation matrix has been mature and effective after nearly 20 years of development, and the combination with actual engineering is also very appropriate. Therefore, the SDI matrix is ​​developed on the basis of the analog matrix, with the absolute function of the analog matrix combined with the high-definition display. advantage.
In the practical application, the SDI matrix has the problem of long-distance access of large-scale SDI cameras. Generally, the transmission distance of SDI cameras is 100 meters, which is far beyond the larger systems. Therefore, matrix input compensation is especially important. Hybrid access mode It is also the first technical problem of the SDI matrix. At present, there are many modes for cameras used in different occasions, such as traditional analog cameras, IP cameras, SDI cameras, etc. Each type of camera has multiple formats, so it is compatible with multiple types of cameras. The technical difficulties of the SDI matrix, especially the upgrade of the old system and the construction of a safe city, have similar problems. The architecture of software management platform and the management of data storage are also the difficulties of SDI matrix technology. For the system of the safe city level, the software management platform of SDI matrix and storage management and fiber access become the necessary technologies.
At present, most of the video surveillance systems that have been established are still analog SD systems. HD is an inevitable trend in the development of video surveillance, but it is difficult to simulate from SD to HD. It can only be upgraded step by step. At present, the domestic HD-SDI market application has not yet formed a scale, and the HD-SDI matrix market is also the same. As a core device in the system, the matrix plays a pivotal role. Therefore, in the near future, the SDI matrix will gradually replace the previous analog and IP matrices. However, in a small-scale monitoring system, the mode similar to the network IP matrix in the SDI DVR mode will exist for a long time.
Future direction
The future development of HD-SDI matrix will be convenient, intelligent and automatic development, and realize remote management and multi-level cascade control by means of network on the basis of realizing high definition and real-time image. With the increasing demand for large-scale construction projects such as Safe City, the existing SDI matrix is ​​developing in the direction of large capacity, network and digitalization. Strengthening the centralized management capability of the matrix network, and cascading the monitoring centers through the network to achieve multi-level authority control management is the current trend. For urban-level systems, the matrix network cascading system consists of a central matrix and a multi-node matrix. Each matrix has an independent IP address for data exchange via an Ethernet port. The node matrix uploads the local video output to the central matrix, and the central matrix can image switch and control the cameras of all node matrices. If the video downlink channel of the central matrix to the node matrix is ​​added, each node matrix can implement interconnection and mutual control and cross-region scheduling. After the matrix is ​​HD, whether it is networked or stand-alone operation, it not only retains the original functions of convenient switching control, image inspection and positioning, but also achieves technical breakthroughs in security construction, such as alarm linkage and group switching. Therefore, the technological development of the SDI matrix is ​​bound to be toward the development of metropolitanization, networking, integration, fiber optics, digitization and extensive compatibility.
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