DETEXI® Network Video Management System
EXPAND YOUR CONCEPTS OF SECURITY
— Setting up IP-Surveillance System — Define Your Surveillance Needs —
Define Your Surveillance NeedsThe first and most important step in implementing a video surveillance installation is determining the goal of your surveillance application. It is a good idea to map out where you want video surveillance to take place and for what purpose (i.e. surveillance overview, identification). This will determine the type and number of network cameras, as well as other components to install and can influence the overall cost of the installation.
How to select a network camera
Define the scene and application needs —To determine the type of network cameras required, as well as the number of cameras needed to adequately cover an area, you first need to determine the scene or environment and the goal of the surveillance application. The purpose will determine the placement of the camera, the type of camera and camera features required (e.g. progressive scan, megapixel for exceptional details, audio, security features) and lens adjustment/type (normal, telephoto or wide angle). A security operator using a PTZ or dome camera can cover a large area and capture different images for different purposes.
In many cases, different cameras will be needed to capture images for different purposes (i.e. one camera providing a full overview image for capturing an incident in action, and another camera for close-up views of a person/object for identification purposes).
Image qualityNot all network cameras are created equal. A key determinant of a network camera is image quality. When assessing image quality, be sure to consider a network camera’s light sensitivity, the crispness of moving objects and the level of clarity. Read through a camera’s datasheet and, most importantly, field test a few cameras before making a decision.
Compatibility with a range of softwareA network camera with an open, application programming interface enables a large variety of software vendors to write programs for the cameras. This will increase your choices in software applications and will ensure that you are not tied to a single vendor. Find out if the network camera is able to work with the software of your choice. Your choice of network camera should never limit vendor options and functionalities.
— Setting up IP-Surveillance System – Application Needs —
Define Your Surveillance Needs
Determine your application needs — features, recording and storage needs
Application featuresDetermine your application purpose — simple remote viewing or intelligent surveillance system with advanced event management, input/output triggers, audio component?
The application purpose will determine, among other things, a required functionality of video management software.
Viewing and recording needsDetermine when and how often you need to view and record — day, night and/or weekends? Schedule the needs for every scene.
Event-triggered frame rateFull frame rate on all cameras at all times is more than what is required for most applications. With the configuration capabilities and built-in intelligence of the network camera/video server and/or video management software, frame rates under normal conditions can be set lower, e.g. 1 to 3 fps, to dramatically decrease bandwidth consumption. In the event of an alarm, i.e. if motion detection is triggered, the recording frame rate speed can be automatically increased to a higher frame rate.
Calculate storage requirementsIn order to appropriately calculate the storage requirements of a network surveillance system, there are a number of elements to factor in.
Calculate bandwidth requirementsNetwork video products utilize network bandwidth based on their configuration. Bandwidth usage depends on five criteria: image resolution, compression type, compression ratio, frame rate and image complexity:
— Setting up IP-Surveillance System – Assess Your Network Needs —
Define Your Surveillance Needs
Assess Your Network Needs
Since digital video systems utilize computer networks as a transportation medium for content, network design can and will affect the overall performance of the video system, as well as the overall performance of the network.A large majority of new networks being installed these days are Ethernet-based, and are laid out in a star structure with a communication backbone between the different switches. Some of these networks may be a local network within a building, while others may be several different local networks, all routed together to a corporate network. First, determine what your company is using the network for and how congested your local area network (LAN) or wide area network (WAN) is.
Assess network use of current LAN. What are you or the company using it for? There are software and hardware tools available to measure the level of congestion on a LAN. Talk to your company’s network administrator. Assess network use of current WAN links. WANs are geographically dispersed networks. You may have WANs that span between office buildings. You can measure the level of network congestion.
Determine the pattern of congestion levels over a given periods — It may be that the network traffic drops off during nighttime and weekends. The usage pattern will help you to determine whether you can:
Network securityThe network provider or administrator, usually the IT department, will have a set of security policies in place for network usage. These policies include items like —
Many of these policies can affect system performance. For example, are external connections to non-corporate machines allowed? Such connections will be needed if the organization plans to use external alarm monitoring services. This would raise a host of questions —
These are just a few examples of questions and policies that would need to be explored to assess how network security procedures can impact system performance.