HD-SDI Camera Application Analysis

 HD-SDI camera application analysis

HD-SDI HD prices are high

After one year of hard work, the application of HD-SDI high-definition surveillance in the Chinese market is not as ideal as people think. It is not difficult for HD-SDI security cameras to simply increase pixels, and prices have a certain downward trend. But in consideration of transmission bandwidth pressure, video compression processing pressure, hard disk occupation, low illumination, big data processing stability, backend host and supporting factors, in the current situation, users are pursuing clearer plans when applying SDI HD security systems. A reasonable trade-off choice needs to be made between the picture quality, the wider monitoring range, and the final purchase cost. At present, the overall price of SDI is still high, and the promotion period is not long. In the eyes of many engineering companies, HD-SDI is synonymous with high prices. SDI prices have a long way to go for the people.

HD-SDI HD transmission "no pressure", "not far"

In general, the SD-SDI, HD-SDI, and 3G-SDI resolutions correspond to 720P@25/30fps, 1080P@25/30fps, and 1080P@50/60fps, respectively. The required bandwidths are 270 Mb/s and 1.485 Gb, respectively. /s, 2.97Gb/s. HD-SDI uses the longest transmission distance of the coaxial cable. The transmission energy varies depending on the transmission cable, broadcast format, and SDI wafer processing signal. Generally, it can transmit about 120-140 meters. Using an HD-SDI repeater, each repeater can extend the transmission distance by approximately 150-200 meters, and can be extended by more than 300 meters. If the HD-SDI signal is transmitted, the transmission distance is shorter. The use of optical fiber transmission can only guarantee the transmission of digital high-definition images from a few kilometers to a dozen kilometers at most. However, due to the high cost of optical transmission equipment and the limited paved areas and distances, it is not a “permanent measure”. In order to ensure the real-time performance of the HD-SDI monitoring system, the signal is not compressed. "Unable to compress" and "not far from" HD-SDI technology is undoubtedly bound to its own information island by the huge transmission data.

Digital HD Advantage

Despite this, HD-SDI digital surveillance still has unique advantages. Compared with IP network monitoring, HD-SDI monitoring has the following advantages: 1. The original analog system wiring can still be used, the system composition and equipment management methods remain unchanged, and the upgrade from the old analog system requires only the replacement of the corresponding hardware equipment. Without the need for training, it can smoothly upgrade from standard definition analog monitoring to high-definition monitoring. 2. The original image is not distorted. Unlike IP surveillance, which is transmitted through the network after being compressed and packaged, HD-SDI monitoring transmits the uncompressed digital signal at high speed on the coaxial cable without distortion. 3, high-definition real-time, not affected by the transmission network, there will be no image delay caused by IP network monitoring, in the occasion of real-time monitoring requirements, the performance requirements are particularly important. 4. Provide more details, maintain the integrity and originality of the image, greatly improve the accuracy of the intelligent analysis algorithm, and provide protection for intelligent video analysis IVS. At present, the application of HD-SDI high-definition monitoring is mainly based on the local small-scale area and the field with high requirements for picture images.

Mr Denial, marketing manager of Tenveo video conferencing Services, said in an interview with HC that the compatibility of HD-SDI high-definition monitoring system is very strong, because in many HD-SDI projects, cable connectors are generally BNC connectors. The connection mode of these lines is also basically the same as the traditional analog line. SDI video can still be used on the basis of the original project, the original analog system wiring can still be used, the system composition and equipment management methods are unchanged, and the upgrade from the old analog system requires only Replacing the corresponding hardware equipment requires almost no training in operation, and smooth upgrade from standard definition analog monitoring to high-definition monitoring, which will save a lot of time and labor costs for the project.