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Frame rate
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Posted by Dean (more from Dean) on Sun, 14 Jun 2015 10:15:18 Share Post by Email
In Reply to: Basic Home Security Recording System, Roger D [Profile/Gallery] , Thu, 11 Jun 2015 10:48:42
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Frame rate goes down with number of cameras and resolution. More expensive DVR's that support more cameras will support better frame rates for a given camera setup. The cheapest system, and there are many, might disappoint. I don't know how motion detect and motion masking changes all of that. If you get a DVR that does not have a hard drive, you can get a type of hard drive that is engineered for that type of video surveillance service. The firmware and file management strategy is different. You can get a large capacity drive and can also then have the drive's manufacturer's warranty that might be 5 years. PC desktop drives are considered unreliable.

For the distance ranges you are considering, you should have different cameras with different fields of view if you want to be able to clearly resolve facial features.

When you provide your own illumination, that drops off as the square of distance as expected. So things further out can be dark and illumination in the foreground causes auto exposure to make this darkness at distance worse. If you are able to work with street lighting that does change the equation. Street light will create shadows on faces that might be a problem. IR illumination and street lighting might complement each other. If street lighting is behind the area of interest, shadowing may be a significant problem.

Higher resolution does allow one to zoom in for more detail to a greater extent that lower resolutions.

Some cameras are better than others in resolving in difficult conditions. You do not want a camera that "flares" too much with things that are bright in the scene.

The system and any external data switches and POE power supplies all need to be UPS protected.

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