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What are the Resolution and the Angle of Coverage?

Resolution refers to a cameras ability to see detail, while the Angle of Coverage deals with how much area is being placed onto the monitor for viewing. Normally we think about these two specifications separately, but when designing a system it is best to combine them. The highest resolution camera will not be able to identify a person’s face if the camera is watching an area of 100’ in width whereas the lowest resolution camera will give you facial identification if the camera is viewing the width of a doorway. Always try to match the covered area to the surveillance objective. If you are asked to cover a large parking lot there is no set formula to accomplish this. You must find out what your customer expects the camera to see. A single normal resolution camera can show a large parking lot if the objective is to see how crowded it is. A single high-resolution camera will add some detail to the scene and begin to show certain details of the cars and the people walking around. Multiple cameras, each showing smaller areas of the parking lot will be required if you want details of what the people are doing and what they look like. Speed Domes offer the ability for a single camera to cover large areas with varying amounts of detail. They accomplish this by panning, tilting, and zooming either under operator control or through pre programmed sequences. The drawback of Speed Domes is the high initial cost and the fact that they can only watch one area at a time, leaving other areas vulnerable.