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Comparing Two Recording Resolution Modes: CIF vs D1
For most DVRs that record from traditional analog cameras, like our QV Series, there are basically two different recording resolutions possible: CIF & D1.  The first thing to understand is that CIF and D1 only describe the height and width dimension (in terms of pixels) of the recorded video. Although pixel resolution is important, the bit rate (Kb/Sec) and frames rate (frames per second...video smoothness) are also key factors in the overall quality of recorded video.

D1 = 720 width x 480 height
CIF = 360 width x 240 height

Example of Snapshot Pictures Saved in CIF and D1:
The best way to see the difference in these absolute resolutions is by example--below shows still image snapshots saved from both CIF and D1 resolutions. For the QV Series DVRs, this recording/encoding resolution is configured in the DVR's "Encode" Menu.

example CIF resolution image
CIF Resolution: 352 x 240 pixels (good 420 TVL camera)


example D1 resolution image D1 Resolution: 704 x 480 pixels (good 420 TVL camera)


CIF vs D1 When Viewing Over the Internet or Playback from the DVR
Although the above two images represent the true frame sizes of encoded CIF and D1 video, the user generally doesn't see the video change in its physical size on the display monitor or viewing software screen.  Most of the time, the encoded video is scaled up or down to fit the viewing window. Because of this, the difference between CIF and D1 is often not as great as one would think. Below shows screen captures of encoded video (CIF and D1) resolutions taken while viewing live video from the Internet Explorer Web Service client on a laptop. The desktop resolution of the laptop was 1200 x 800. The images below are cropped portions of the IE client at full screen:

IE CIF camera view CIF Resolution Scaled up to Fit in IE Live Viewing Window (Good 420TVL Camera)


IE CIF camera view D1 Resolution Slightly Scaled up to Fit in IE Live Viewing Window (Good 420TVL Camera)


Second Example of CIF vs D1 with 520TVL Resolution Camera
Theoretically, a higher resolution camera should take advantage of D1 resolution encoding more than the 420TVL resolution camera (our model 1R-0007-24IR Vandal Proof Dome) that has been use in the previous examples. Therefore, we are showing two more example screen captures from our high resolution (520TVL) Wonwoo WSJ-300 PTZ camera:

IE CIF camera view CIF Resolution Scaled up to Fit in IE Live Viewing Window (520TVL Camera)


IE CIF camera view D1 Resolution Slightly Scaled up to Fit in IE Live Viewing Window (520TVL Camera)



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