CCTV Analog and IP Resolution

CCTV Resolution for Analog Cameras

Customers often ask what kind of resolution is best for their particular CCTV system. Picking the right resolution for your surveillance camera can make or break your system.

Understanding the differences between Analog and IP can go a long way in determining which equipment to purchase.

For standard analog cameras, resolution is measured by TV Lines.  For most new analog cameras the TVL range is 420 to 700.  Although 420 TVL is considered the lowest, I’ve seen camera systems where the user was only covering a short distance and the video quality was actually pretty good.  Don’t automatically assume a low res cam is garbage.  For short distances, the low resolution camera could save you some money and put a good image up.  Now, the 600 TVL and above have excellent images.  The pictures are sharper and the contrast is great.

If you want great clarity the 600+ range of resolution is the way to go.  There are other factors for a good clear picture like lenses, lux, wide dynamic range, etc.  Make sure you speak to a pro about your needs – 016 666 1221 or 019 900 8288

CCTV Resolution for DVRS (recording resolution)

Once the camera captures the images that you want, it will send them through coax cable (or Cat 5 with Baluns) to the DVR.  At the DVR, the images are converted from an analog signal into a digital format to be stored on a hard drive.  This is the most important part of the chain.  The greatest most powerful camera will not be effective if the image is compressed down to nothing by the DVR.  The two most popular DVR resolution types are CIF and D1.  CIF is defined as 320×240 pixels and D1 is 720×480.  As you can tell, D1 is 4 times larger than CIF.  That means that the raw analog signal of the camera will be compressed less, giving you better detail.

When looking for a DVR keep recording resolution in mind.  Most DVRs have both options but will usually lower the frame rate to allow for higher resolution.

CCTV Resolution for IP Cameras

Next, we’ll cover CCTV resolution for IP cameras.  IP cameras (megapixel specifically) are able to deliver a much higher resolution.  Firstly, a MP camera is already digital so there is neither conversion nor compression.  Secondly, MP cameras run their signal through Cat 5 or 6 which allows for a much higher transfer of data.

1.3M is generally the smallest resolution of IP megapixel camera, but is still quite a bit larger resolution than any analog cam.  Even though this is a huge jump from analog, if this is not enough you can jump to 3.0 megapixel and get a 2048×1536 resolution.  Still want bigger?  Go with the 5 megapixel for a 2592×1944 for a HUGH image.

If analog resolutions are not cutting it for you, IP surveillance cameras can definitely accommodate any large resolutions.

Summary

 With a DVR and analog cameras you are limited to CIF, 2CIF, 4CIF, and D1 resolution.  This may or may not fit your specific needs for your CCTV setup.  If you need higher resolution you should consider IP megapixel cameras and a network video recorder.