Resolution (D1 and
CIF)
Resolution is the size of the image on the display. The most
popular resolutions are D1 or 4CIF (720x480), and CIF (352x240). Nearly all DVRs
will display in D1 or 4CIF but CIF is a more popular recording resolution. D1
and 4CIF are larger images, but to record the larger image takes up more hard
drive space. In addition, most DVRs need to lower the frame rate dramatically
when using these resolutions for recording. A DVR that records at 30 frames per
second (real time) in CIF mode will usually only record around 7 frames per
second in D1 or 4CIF.
