Tuesday, March 5, 2013

Replacing your old CCTV system with HD Cameras? Good idea.

Replacing your old analog cameras with new digital HD cameras should be an easy installation, let's check out the High Definition CCTV Security System.

HD cctv is considered by many as a subset of megapixel and is defined by a specific resolution at specific frame rates with a specific aspect ratio. A camera with more than a million pixels is by definition a megapixel camera. The lowest resolution security camera with a megapixel number is 1.3 and provides 1280 by 1024 pixel resolution and is the 1080P camera.



The 720P HD camera provides images that are 1280 by 720 pixels giving you 921,600 pixels and is short of the 1 million mark, so your 720 high definition camera is not a megapixel camera but many people feel it's close enough so they call it a 1 megapixel camera. If your a installation contractor make sure your customer has a clear understanding of this. I've seen it cause issues with the end user after the installation has been completed.

Traditional analog cctv cameras providing 4CIF resolution offers resolution of 704 by 480 pixels (NTSC) or 704 by 576 (PAL) after the signal has been digitized in a DVR that corresponds to a maximum of 400,000 pixels.

When designing a CCTV system two types of coverage areas get talked about, a wide field view and a detailed specific view. In your wide field view 20 to 30 pixels are enough to represent one foot of a scene. For your detailed specific view of certain images such as cash, face identification, factory assemblies, the demand can rise to over 80 pixels per foot. Here's a cheat sheet I keep on hand just to remind me of what pixel count will fit my field of view best for my location.



Still reading? Good, because I have a about a 30 minute presentation from Everfocus regarding HD cctv. Everfocus is a camera manufacture and has been in business for many years providing solutions for commercial locations. Let see what they have to say.




Now that you know you can use your existing coax cable infrastructure your installation is already half way done! Are these HD cctv security cameras also the same as far as the construction? Yeah! Let's check out a couple from our YouTube Channel.




Here's a look at a HD pan tilt zoom camera.




Don't forget that you will need to also install a High Definition DVR for your new HD cameras. If you only need high definition at a couple of locations such as a cash register, hybrid digital video recorders are available to provide you more security at a more economical price.

Now that you have some knowledge about HD cctv are you ready for six times the resolution over traditional analog cameras. I knew it!

"By Mercy Salinas"