Image Per Second

Almost all customers and even some CCTV installers will take the DVR recording Image Per Second (IPS) or Frame Per Second (FPS) as a yardstick to rate a DVR. The higher the IPS or FPS over the number of video channel ratio the better.


But do you know the different between IPS and FPS? You need to be very careful when compare a DVR's IPS with another DVR's FPS.


Mpeg technology uses the interlace scanning technology (please refer to my 2008 Nov posting - Halloween – Unidentified Flying Creature) And here comes the confusion, some unscrupulous DVR producer actually self-define IPS as each interlace scan as one image. In other words if they said their 16 channel DVR is 400 IPS recording, in actual fact it is only 200 FPS recording worth.


Well, what I'm trying to say is, you may end up paying full price for half a car.