Design it right the first time
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.
Much of the footage seen on TV news reports, where they are asking if you recognize this person is useless
That may appear obvious but there are four main criterias we define a camera as being used for.
- Observe the what is happening in an area
- Recognize a person you know
- Identify a person you don't know
- Detect the presence of people in a scene
Much of the footage seen on TV news reports, where they are asking if you recognize this person is 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.
Designing first with a 3D drawing software helps to test the scene to determine the right camera resolution, lens and location to give the desired results. This will save you relocating or replacing cameras later on.
This first of this 3 part video takes us through the use of one of the popular CCTV design software's, showing how to insert a site plan and set the grid scale. Placing a camera to get an idea of its coverage based on the 3D site map.
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.