Saratoga Web Design

A video surveillance system can be quite costly so it is wise to have a level of understanding as to what the system is capable of achieving. The best point to start at is defining what you want the system for. That may appear obvious but there are 4 main criterias we define a camera as being for.

1. Lets me observe the behavior of people in an area

2. Recognize a person you know

3. Recognize a person you know

4. detect the presence of people in a scene

Many of the footage seen on TV news reports, where they are asking if you recognize this person are useless not because the camera was rubbish but because they were trying to do more than one of the above at the same time with it. An observe camera will almost never allow you to ID someone. Even if it is a megapixel in most cases.

Using a 3D CAD assists you in determining the best surveillance camera, resolution, height and lens selection before you buy any equipment and find it does not do the job.

In part 1 of the following video, we look at the basic steps to add a background from a map or floor plan, get an accurate scale, start to place cameras allowing us to get a good idea of what the camera will see.

Part 2 below shows how to determine the above 4 criteria based on the coloured regions in the lens view area. So for ID quality of an unknown person we need to work in the red region. In the blue region you would only be able to detect the presence of a person in the scene but not know who they are or what they are doing. It also shows how we create the 3D images of walls and other structures.

Part 3 goes on to detail what we can expect to get from different resolution cameras and the affect of digital zoom on an image, which you may be surprised to find reduces resolution by 4X every time you zoom by 2X.

For those readers who really want to understand more about how to design a CCTV system that gives great images, take a look at CCTVdesign.com.au, where you will also find a large amount of data about licensing, installation tips and legislation.

I found this site about designing a CCTV system and have to say the advice has been great

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Tags: alarms, CAD, cameras, CCTV, consultant, design, electronics, Saratoga Web Design, security, software, video

This entry was posted on Sunday, July 17th, 2011 at 8:55 am and is filed under Saratoga Web Design. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.