HDcctv monitoring system due to high-definition, uncompressed digital signal transmission, will inevitably bring a huge amount of storage data pressure, while also put forward higher requirements for storage technology, which is unimaginable in the traditional storage industry. HD storage requirements are reflected in the following aspects:
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Storage performance requirements. Video surveillance is mainly the continuous writing of the video stream. The performance of the video determines how many streams can be supported at the same time. In the case of multiple concurrent data writes, it has a great impact on bandwidth, data processing capability, cache, etc., and the storage needs to be optimized for video performance; the security requirements of massive data. The video data of the surveillance video must be guaranteed to be intact in the first time, and the real-time, uninterrupted and redundant nature of the video data must be achieved; the requirements of centralized management. In security monitoring applications, because a large number of storage devices are required, the massive data in the storage devices must be effectively managed, and it is necessary to provide convenient, reliable, and transparent support for the use of the end user.
A variety of storage products on the market such as HDDVR, NVR, NAS, IP-SAN, HAR, etc., all appear to meet HD storage.
As technology advances, the creation of new technologies or successful data storage technologies in other industries will be added to HD storage applications. Professional storage vendors will stand out in these technologies and product designs for HD storage. The overall solution brought by professional storage vendors will also become the general direction of future choices. SDI's storage products will also become a useful complement to HD storage with the application of HD-SDI cameras.
Technical application of SDI-DVR
At the beginning of 2012, individual security vendors did not have their own HD storage solutions, and they were still conceptually promoting the whole set of SDI products. Due to the particularity of SDI products, the whole promotion will enhance the sales of the products. The compatibility of video signals makes the whole promotion more important, but there is no suitable HD storage solution. The use of SDI products is limited to video preview. After more than half a year of product promotion, the market demand and customer recognition have been greatly improved. The original analog system wiring can still be used on the basis of the original project. The system composition and equipment management mode are unchanged. The old analog system is upgraded and only needs to be replaced. The corresponding hardware equipment, almost no operation training, can smoothly upgrade from standard definition simulation monitoring to high-definition monitoring; SDI-DVR as a high-definition solution, the first problem is the codec performance requirements, followed by SDI- DVRs have this higher requirement for bandwidth.
The original image is not distorted, unlike IP surveillance, which is compressed and packaged and transmitted over the network, while HD-SDI monitors the uncompressed digital signal on the coaxial cable for high-speed transmission without distortion; HD real-time is not affected by the transmission network. There is no image delay problem caused by IP network monitoring. This performance requirement is especially important when there is real-time monitoring requirements; more details are provided to maintain image integrity and originality, which greatly improves the accuracy of intelligent analysis algorithms. It provides guarantee for Intelligent Video Analysis (IVS); the density of camera points per unit area is greatly reduced, which improves the utilization efficiency of the collection equipment. The development trend of SDI-DVR
Incremental promotion of the entire package
With the transparency of the SDI front-end camera solution, the price of the SDI camera has been reduced. When the SDI-DVR is launched, the entire packaged sales method will be generated. With the transparency of the SDI-DVR solution, the sales price of SDI-DVR products will be gradually reduced, which provides customers with another HD solution.
Continuously optimized product performance and improved storage performance
When selecting a product, the customer will regard the picture clarity as a key indicator. At present, the SDI camera is 2 million pixels, the video output format is 1080P, and the video effect is full real-time HD, which has already satisfied the customer's visual experience.
With the launch of SDI-DVR, HD real-time storage is also a hard indicator to measure the performance of SDI-DVR. When customers use DVR to preview HD video, once the card appears, it will directly affect the customer's intuitive experience.
With the advancement of digital technology, the amount of data that needs to be stored is getting larger and larger, and the performance of storage is testing this product again. The acquisition of 4-way or 8-channel 1080P HD video and HD real-time storage make the choice of storage solution especially important. With the improvement of the system, it is undergoing a step-by-step evolution and improvement. In the future, integrating NAS, SAN and other technologies, and storing data directly through the network will be an inevitable trend in the development of SDI storage technology.
Storage methods need to be diversified
At present, the storage methods are roughly classified into an embedded DVR, a hardware NVR, a PC-based software NVR, a network storage technology NAS, an IP-SAN, and the like. The advantages of embedded DVR or NVR are relatively stable and reliable. The disadvantage is limited capacity, which is suitable for small systems. NVR, NAS, and IP-SAN based on PC or network technology are overly dependent on network environment, with high system complexity and relative stability. It will be low, but it is more suitable for building large-scale network monitoring systems across regions. And SDI-DVR will also behave in this. SDI-DVR is equivalent to a normal DVR in the application environment, and has higher transmission performance than ordinary DVR.
HD storage challenges
At present, the high cost of SDI-DVR high-definition monitoring is a key factor that restricts its rapid promotion. Domestic manufacturers are fighting for each other, standards are not uniform, software is incompatible, and incomplete support will restrict the development of high-definition surveillance. In terms of storage technology, first of all, the security and reliability of storage media (mainly hard disk technology), data storage efficiency, and intelligent analysis of video data have great room for improvement. For example, the storage data can effectively reduce the occupation of network bandwidth and storage capacity by massive data, which will greatly reduce user costs. For users, HD storage is most concerned with image quality and real-time performance during surveillance and playback. However, the overall cost of efficient and easy-to-use platform software and systems is also a key factor affecting user selection.
According to IMSResearch, from 2011 to 2014, the market demand for HD surveillance in the Asian market will grow rapidly at a compound annual growth rate (CAGR) of 160%, while the traditional analog surveillance market has reached saturation and will begin to decline in 2014. This trend is both an opportunity and a challenge for security monitoring vendors. This requires manufacturers to provide complete HD-SDI solutions for HD surveillance systems, as well as IP-based solutions, launching HD IP cameras compatible with ONVIF and PSIA, and NVR systems.
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