Network cameras enable people to view video anywhere at any time. This helps customers build a large video monitoring system which can hold many thousands of cameras. When using full HD network cameras, which is becoming a trend in video surveillance, high resolution images and wide field of view can truly help people. They not only see, but also see more clearly and farther.
Network cameras enable people to view video anywhere at any time. This helps customers build a large video monitoring system which can hold many thousands of cameras. When using full HD network cameras, which is becoming a trend in video surveillance, high resolution images and wide field of view can truly help people. They not only see, but also see more clearly and farther.
Typical security requirements for a large-scale bank are complex, with hundreds of branch offices located around the world. To guarantee the safety of all branches, each office is required to install about 50 HD network cameras. A security administrator who is at the headquarters wants to view the video streams from these cameras at any time, to understand the safety conditions of these branch offices through a wired or wireless network. How should one build a video surveillance system for this application?
Whether wired or wireless, there is not enough network bandwidth to monitor thousands of video channels. It is impossible for all of them to simultaneously stream video back to the bank headquarters.
Furthermore, it is unimaginable that the images from thousands of HD camera are recorded and stored at the headquarters. Therefore, on-site monitoring centers must be built at each branch, so the local security administrator can monitor live video and play back the recording data. However, the bank HQ administrator also has access to live video and can retrieve recording data he needs from any branch freely. There are four solutions for this bank's security: DVRs, hybrid DVR, CMS and NVRs. In fact, they can all offer the capabilities to build a large video monitoring system. However, when they are used for HD monitoring, what is their effect and how should one evaluate them?
HD Network Camera Support?
DVRs provide key features such as encoding streaming video, recording video and decoding video. But DVRs can only connect to analog cameras. Due to the limitations of coaxial cable CVBS that can only support 300,000 pixels, megapixel images cannot be transmitted to the DVR. Although DVRs with HD-SDI ports can support HD cameras, their cost will undoubtedly be high. Analog cameras also require cabling and installation, which leads to increased equipment and service costs. In this situation, there are no advantages to adopting DVRs along with SDI and HD cameras.
Hybrid DVRs have the same functions as DVRs, but can also can receive video streams from network cameras. However, most hybrid DVRs are only upgraded based on analog DVR specs and only add the ability to receive network video. Because of hardware limitations, it is difficult to offer additional capacity to decode HD images.
In the end, CMS and HD NVRs can take over and decode megapixel video. However, CMS requires high-powered computers due to software decoding. HD NVRs are designed based on pure hardware decoding, so that the NVR achieves higher cost-performance compared to CMS solution when the same number of HD inputs are decoded.
Reliability: CMS or NVR?
NVRs are designed from embedded system and industrial technology, guaranteeing third stability and reliability. They adopt multiple techniques customized for constant video surveillance, such as optimized file system and optimized disk storage. Because of these hardware considerations, the NVR is more reliable compared to PC-based CMS.
With widespread adoption of HD surveillance cameras, HD NVRs are the only viable solution for users deploying large-scale distributed video monitoring systems.
Sunell's strengths in technology and design have delivered a new series of HD NVRs, with eight, 16 and 32 channel models as part of the lineup. HD NVRs have high stability and reliability using embedded design for 24/7 operation. Combined with the full range of SD, HD and full HD cameras from Sunell, end users will be able to build genuine large-scale video surveillance systems