Project Overview

The main function of the park video surveillance system is to assist the security system in monitoring the live situation inside and outside the entire park area. It enables management personnel to observe the situation of all important locations inside and outside the entire area in the monitoring center, providing monitoring means for various equipment operations and personnel activities, and is the most important part of the entire regional security system. The front-end of the system adopts high-definition network cameras, which are transmitted to the security center through the network. The center controls and displays images through high-definition digital matrices. Therefore, establishing an effective security system is an important foundation for intelligent security prevention. Video surveillance system is an important component of security system transformation and a manifestation of intelligent management, which greatly improves the level of modern management and is an important part of building a harmonious society.

The design of the video surveillance system for this construction is based on digital network architecture and applies multimedia control management technology based on computer networks. The control, storage, transmission, and query of surveillance video images are integrated into the unified management of the computer network. The two complement and complement each other, jointly building a practical, efficient, and fast security monitoring system. Provide advanced technological means for security monitoring systems to ensure the safety of the entire area. Establish a comprehensive and powerful technical prevention system using technical defense measures to meet customers' security monitoring requirements. At the same time, cooperate with security personnel management to achieve the unity and coordination of civil defense and technical defense, in order to achieve the goal of safe and efficient management.

　　System Design

1. System topology diagram

Design Notes:

The entire video surveillance system uses a digital IP architecture;

The front-end camera is equipped with a 2-megapixel high-definition network camera, and corresponding infrared high-definition network ball machines and high-definition network ball machines are used according to different environmental locations;

The front-end network camera collects signals, encodes and compresses them into digital IP signals, and transmits them to the monitoring center through the network. The video signals are encoded using H.264 and stored by NVR, achieving centralized management and digital recording of front-end monitoring points by the center;

◆ The center is equipped with a comprehensive high-definition digital matrix, which supports mixed signal input: video signals from different interfaces such as HDMI/DVI/VGA/AV/SDI/IP can be simultaneously connected, and output to the large screen for functions such as splicing, roaming, stacking, and transparency adjustment;

The alarm signals of each alarm subsystem are linked through the alarm host IP module and high-definition digital matrix to output corresponding alarm videos;

Network switches can be equipped with 100Mbps or 1G switches according to actual needs to achieve redundant exchange of network data transmission.

2. System composition

This system mainly consists of front-end cameras, transmission links, and central control/display parts. The cameras at each monitoring point send video image signals to the monitoring center through the network, and store them through the IP-SAN network. Computers can query monitoring video recording and other data through the client; On the other hand, multiple monitoring images are displayed in real-time in front of the on duty personnel through the display unit set up in the control center.

1) Front end video capture system

The front-end video capture system is designed to observe and collect information. The front-end monitoring equipment can adopt high-definition network cameras based on the standard H.264 algorithm according to the actual needs of users. The compressed resolution of high-definition network cameras reaches 1980X1280. Due to the standard 16:9 widescreen display ratio of high-definition network cameras, they have a larger visual range than traditional analog videos. Moreover, due to their higher effective pixels and resolution, the resulting video images are clearer than traditional analog cameras.

2) Video transmission system

The transmission private network for videos is to ensure smooth video flow, similar to the "blood vessels" of the human body, which need to be ensured not to be blocked. The main equipment includes access switches, fiber optic transceivers, aggregation switches, core switches, backbone transmission optical cables, and video access using Category 5e (Category 6) unshielded twisted pair cables. The construction of a dedicated video transmission network needs to consider bandwidth, packet forwarding rate, backplane bandwidth, multicast, and QoS technologies. If the video transmission network requires external network access, security and antivirus measures need to be taken, and a firewall needs to be added in the private network system. Build a digital video dedicated network according to customer requirements, carrying video images and other data.

In terms of the relative relationship between video quality and access bandwidth for monitoring, an upstream bandwidth of 384Kbps can transmit clear and smooth CIF resolution images, an upstream bandwidth of 512Kbps can transmit clear and smooth 2CIF resolution images, and an upstream bandwidth of 1.5Mbps can transmit clear and smooth D1 resolution images. The video bandwidth for this high-definition 1080P transmission is approximately 8Mbps. Select different switches for exchange and transmission based on the actual number and bandwidth of cameras.

3) Central management control system

The monitoring center is the core of the entire system, connecting various monitoring resources and managing, storing, calling, and displaying them accordingly. Its main purpose is to improve security prevention and provide a centralized application venue for decision-making, command and dispatch, and evidence collection by leaders at all levels. The central control design of this system consists of three parts:

1. Control section

The control part of the system is mainly completed by high-definition digital matrix, which is used as a dedicated device for switching between high-definition/standard definition, digital/analog and other video control on the wall, controlling image processing and display functions such as video segmentation, scaling, stacking, and splicing.

2. Network storage section

The storage of videos plays an important role in ensuring the retrieval of historical alarm events and facilitating post event evidence collection. So the resolution of the image is crucial, and the backend video storage device should be equipped with NVR network storage devices to achieve centralized management and digital recording of the front-end monitoring points. The stability of the device determines the overall performance of the system, and the resolution of the image must reach 1080P (1980 × 1080) or above to ensure the clarity of video playback details. Due to the need for separate storage and retrieval in two locations, two sets of storage devices are required.

◆ Single set video capacity storage calculation

Calculated based on single channel 1080P image quality, 8M/S bitrate, and 30 day video storage:

Single channel capacity=3600 seconds x 24 hours x 30 days x 1 channel x 8M ÷ 1024 ÷ 1024 ÷ 8=2.47T

40 channel capacity=2.47T x 40 (channels)=98.8T, with additional hard disk redundancy,

Total capacity=110T

III. Display section

The image display unit is configured with a 3x3 DID splicing screen in the middle, and each display screen has single screen display, 4-screen display, wheel tracking display, etc.

3. System features

1) Characteristics of Digital Matrix

◆ It is a pure hardware non compressed embedded high-definition digital matrix, with no loss or delay in video;

Modular structure and support for mixing multiple business boards in any combination, making the system flexible; Easy to expand and upgrade in the later stage;

Support video signals with different interfaces such as HDMI/DVI/VGA/AV/SDI/IP, which can be simultaneously connected to mixed signals for arbitrary switching;

◆ It has graphic processing capabilities and supports video display, segmentation, and other functions;

Specialized control software or user customizable SDK for easy system integration.

◆ Configure a dedicated control keyboard, considering usage habits and on-site hardware environment. The keyboard functions should be centralized, comprehensive, and easy to operate. The center of the keyboard joystick should be equipped with an image capture button to capture dynamic images in real time. The number of input and output interfaces provided by the matrix needs to be surveyed on site, and full consideration should be given to the expansion and application of the later access system.

2) Strong compatibility

Due to historical reasons and competitive needs, different manufacturers and encoding formats of encoding and decoding devices are often used in the same network video management system. From the perspective of design and requirements, users also require different encoding and decoding devices. Users need an open system video management system that meets flexible applications and is highly stable.

The system supports a new type of digital device that requires the implementation of new drivers without the need for design changes or complex custom development. It has successfully implemented support for digital devices from multiple manufacturers such as Hikvision, Bokang, Dahua, DVMUX, etc. It can support the mixing of different types of digital devices in the same system. And support fast interconnection of alarm hosts and matrices from different manufacturers and models.

3) Reliable recording

This system adopts professional storage products, which can simultaneously record and play videos on a single machine, support error prevention redundancy, and have been successfully applied in multiple large-scale projects.

The system adopts advanced storage solutions, which have a higher performance price ratio than early storage systems. It supports hot swapping and power redundancy, ensuring the stability of video data. It provides complete storage management software and can achieve various functions of large-scale storage systems.

4) Post expansion functions

The development of the security industry is high-definition and intelligent, while traditional monitoring equipment is based on control and content independent processing devices. After analyzing the industry development trend, it is believed that digitalization of monitoring will inevitably require monitoring equipment to have more video intelligent processing capabilities.

Therefore, the digital matrix adopts high-performance programmable video processing chips, which can analyze and process videos at the pixel level, providing an excellent platform for intelligent processing; This provides a feasible platform for the increasing demand in the security field, such as behavior analysis, intelligent content indexing, and facial recognition.