August 11, 2009

CCD vs CMOS

At the heart of every digital camera in the world there is an image sensor. The image sensor converts light into a digital signal. There are two basic types of image sensors in use today. There are CCD (Charged Coupled Devices) and CMOS (Complementary Metal Oxide Semiconductor) sensors. Each type of image sensor has its […]
August 8, 2009

The Relationship Between The Camera TVL And The Resolution Of The DVR

Here is a very common question. How many TVL should the camera have to best use the resolution of my DVR? This is one of the most misunderstood relationships in CCTV. The resolution that the DVR records in refers to the SIZE of the image being recorded. So CIF resolution (360×240) and 4CIF resolution (704×480) […]