Next-generation video surveillance system application storage solution

The development of video surveillance in China

Since the introduction of surveillance technology into my country in the 1980s, it has been developing rapidly with the sharp increase in security needs. From a technical perspective, it has gone through several different stages of development. With the development of computer technology and the popularization of the Internet, video surveillance has now developed into a network multimedia surveillance system.

The fundamental difference between the new generation of video surveillance management system and the previous generations of video surveillance systems is that it is no longer limited to simply completing the processing, transmission and control of video signals. Its core is to provide a comprehensive and complete management and control platform for multimedia information (video/audio/data) based on IP networks. The network multimedia monitoring system is based on the network, with the compression, transmission, storage and playback of digital video as the core, and features intelligent and practical image analysis. It is integrated with the alarm system and access control system on a single platform, which has triggered a technological revolution in the video surveillance industry and quickly attracted the attention of the security industry and users. The network multimedia monitoring management system can be widely used in multimedia video dispatching and command, network video monitoring and conferencing, multimedia online live broadcast, online teaching, telemedicine and other aspects.

The network multimedia monitoring system consists of a network multimedia monitoring management platform and front-end information collection equipment, with the core being the network multimedia monitoring management platform. The network multimedia monitoring management platform integrates computer networks, communications, video processing, streaming media, and automation technologies. It is an integrated solution for video, audio, data, and graphics, and has network video monitoring, video conferencing, video live broadcasting, and other functions. It has ultra-large-scale networking capabilities and is a comprehensive multimedia business management platform built on LAN/Internet networks that supports multiple transmission methods. Its applications have far exceeded the content covered by monitoring itself.

The Network Media Video Server (NMVS) is responsible for the front-end video processing part. It also has the network transmission function of the network video server and the storage function of the hard disk recorder (VideoSever+DVR). NMVS is a special computer device that compresses, stores and processes video, audio and data. It is widely used in video monitoring, online teaching, IP video conferencing, video live broadcast and video on demand. NMVS uses the most advanced compression formats such as MPEG-4 or H.264 to compress and encode video data in accordance with technical indicators to meet storage and transmission requirements.

Storage requirements in video surveillance systems

Video surveillance has the following characteristics for storage requirements:

1. The demand for storage capacity is relatively elastic. The amount of storage capacity will increase exponentially with the improvement of picture quality, the increase of picture size, and the increase of video lines.

2. The storage performance requirement is not high, but it needs to be able to meet long-term continuous data reading and writing, with large data flow but low number of access requests.

3. The data retention period is short. In general, the data in monitoring locations can be deleted after being kept for a certain period of time (such as 1 month).

To select the right storage device for a video surveillance solution, you must first estimate the storage capacity required. The calculation is as follows based on the current mainstream compression method:

MPEG4 compression method: 200MB/hour/channel;

H.264 compression method: 150MB/hour/channel

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1 day = 24 hours; 1 week = 168 hours; 1 month = 720 hours

1 channel; 1 monitoring line

Number of days for video storage and hard disk capacity (24 hours of continuous video recording per day; hard disk capacity in GB; 105% of the following values ​​is the actual hard disk capacity in use)

From this table, we can basically estimate the type of storage device required in a video surveillance project. For example, a bank needs a 4-channel video surveillance system, 7*24 hours monitoring, and data can be stored for 3 months, so the total capacity requirement is 1.7TB. Therefore, we can consider recommending NS3500/NS33/NS35 series storage devices.

On-demand storage solutions

Then, after we analyze the requirements of the video surveillance system for the storage system, we can develop different solutions based on different demand characteristics.

Distributed independent video storage

The characteristics of this type of monitoring demand are small data volume, scattered data collection points, limited equipment investment, short data storage cycle, and low data security requirements. The DAS connection method is used to directly connect an external storage device to each monitoring server or industrial computer for storage expansion. This method has a low one-time purchase cost and a small-scale maintenance cost that is within a controllable range, but it is not easy to expand, and the maintenance cost will increase rapidly as the monitoring scale expands.

This type of storage solution is suitable for community video surveillance systems, campus video surveillance systems, small and medium-sized enterprise video surveillance systems, remote area video surveillance systems, etc. The first choice of storage device is Inspur NS35/33 series.

Centralized network video storage

The characteristics of this type of monitoring demand are large data volume, extensive and relatively concentrated video lines, high monitoring density, long data storage cycle, and high data security requirements. The SAN connection method is used to allow each monitoring server or industrial computer to directly connect to the inverted SAN storage network and use centralized storage devices. This method has a high one-time purchase cost, is easy to expand, and has low long-term maintenance costs.

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This type of storage solution is suitable for security department video surveillance systems, urban road command centers, highway video surveillance centers, etc. The Inspur CX series is the first choice for storage devices.

Video surveillance case application-highway monitoring system

There are 8 toll stations on a certain highway, each with four lanes. There is a toll booth for each lane, for a total of 8*4=32 toll booths. Each toll booth is equipped with a toll collection computer and related facilities connected to the highway management center.

In order to cooperate with the expressway ticket checking system and realize the statistics and monitoring of passing vehicles, this expressway vehicle image monitoring system solution is specially planned and designed.

The specific equipment configuration is as follows:

1. Install monitoring equipment: A color camera is installed at each toll gate of each toll station, a total of 32 cameras, and the monitoring range is the vehicle channel at the entrance of the expressway. Each camera is equipped with a video server, which is connected to the camera and the network at the same time, and is responsible for encoding the video signal collected by the camera and transmitting it on the network.

2. Video recording settings: The system is set to dynamic detection video recording, which triggers the camera to record when a vehicle arrives. When a passing vehicle passes by, it will trigger the system alarm and record the video through the computer.

3. Working 24 hours a day: Using vehicle arrival video recording to record all passing vehicles.

4. Use digital camera method: digitized images can be directly submitted to the computer for processing.

5. Distributed data storage: The data processed by the computer is directly stored in an external large-capacity array. In this solution, the storage device can use Inspur's CX series products.

The entire system is built in a network system environment. Video footage from all over the world can be called up and viewed at any time through the network. It is a model for storage applications in highway monitoring systems.