Early analogue systems used multiplexers and matrix switches coupled with many monitors involving great complexity and cost. Today, modern technology has enabled the simplification of the control room and the display of video sources along with other vital information.

Dahua is one of the largest splicing video wall providers in China, and according to the company is ranked second with 9.1% market share in the industry. 

Splicing video walls normally use LCD screens (LED backlight) with a very slim physical bezel, which is quite important when displaying an image across several monitors. The most common bezel size in the market is around 5.5 mm. Dahua offers bezel sizes from 3.5mm. Dahua video wall monitors are available in 46” and 55” panel sizes.  The displays have brightness levels from 500 nits to 700 nits to ensure a good view in all ambient light settings and all are designed for 24/7 operation.

Surveillance applications require many types of inputs from devices including: IPCs, DVRs, NVRs; local HDMI/DVI/VGA video signals; and the number of channels is often above 200. The ability to view many inputs with a single output or arrange inputs and outputs to meet the specific requirement can be challenging.  In order to meet those tough requirements, Dahua utilises its experience of network video encoding and decoding technology in video matrix development.  

The Dahua network video matrix is an embedded hardware specially designed for video wall solutions. Based on Advanced Telecom Computing Architecture (ATCA) architecture, it offers a redundant design for many important parts, such as fans and power, which greatly enhance its reliability and stability.

The modular designed Dahua matrix consists of 3 parts: mainframe, encoding card and decoding card. The mainframe offers power, control, network and high bandwidth backplane for different cards. For the encoding card, Dahua offers multiple kinds of video interfaces including HDMI/ DVI/ VGA/ HDSDI/ HDCVI/ CVBS, etc. It is easy to input any kind of supported signal to this matrix with just the selection of the corresponding encoding card.

In addition to all these local video signals, it has a great capacity for network video streams such as IPCs, NVRs DVRs, etc. For the decoding card, it provides high network video decoding ability and offers the video output channel for both network video and local video signal as well. For pure network applications, one matrix can decode 160ch@1080P/ 640ch@D1 network video streams and support up to 40 screens. 

This network video matrix can be combined with the video wall to provide an effective solution for centralised visualisation in surveillance applications.