It is virtually impossible to describe all types of available security cameras in this short article. We will focus our attention on most popular and widely used camera types instead.
CCTV security cameras produce images using CMOS or CCD (Charge Couple Device) chips.
Tiny, very low price CCTV cameras usually use CMOS technology, produce poor quality images and have very poor light sensitivity. Decent quality CCTV cameras use CCD technology.
The size of the CCD chip is normally 1/4", 1/3" or 1/2". As a rule of thumb, the larger the size, the higher the quality of the image produced and the higher the price. However, higher density 1/4" and 1/3" CCD chips can now produce as good an image as many 1/3" or 1/2" chips.
The number of TV lines in the security camera image is a measure of picture resolution (sharpness). The larger the number of TV lines, the better the resolution and hence, overall picture quality. Standard resolution camera may have 350-380 lines, over 400 TV Lines is generally considered good resolution while over 500 TV lines is considered high resolution. B/W chip cameras produce greater resolution and better light sensitivity, therefore suitable for use in dark areas where light conditions are poor most of the time.
On the other hand color cameras offer more realistic and natural picture.
CCTV cameras are usually divided into different types based on the body of the camera used.
Robert Moskal is Technical Department Manager at V2Comp,Inc, a major distributor of security equipment located in Chicago area. More information about new products can be accessed at http://www.amazingcameras.com or http://www.v2comp.com
