A wide range of cameras from regular analogue cameras to megapixel cameras with ultra high definition (4K2K) can be supplied. All cameras are manufactured by companies with more than 10 years background from the CCTV industry.
HD vs. Megapixel
HD is a type of megapixel camera. All HD cameras are megapixel but not all megapixel cameras are HD. While standard definition cameras (e.g., analog cameras and 4CIF IP cameras) have no more than 400,000 pixels, all megapixel cameras (including HD) have 1,000,000 or more pixels.
HD's Key Features Compared to Typical Megapixel
The key features of HD for video surveillance are:
Maximum HD resolution is 2.1MP, while maximum megapixel resolution is beyond 20MP. Today 5MP cameras have become common from numerous vendors.
HD video format is 1280 x 720 or 1920 x 1080 (megapixel cameras can offer many more formats)
HD aspect ratio is 16:9 (compared to 5:4 or 4:3 in other surveillance cameras)
HD frame rate is 30/25 while some megapixel cameras may support 60 fps @ 2 Mpxl.
HDTV has quality compliance standards (where megapixel simply specifies the number of pixels)
Which is Better?
This is not a clear cut case - it will depend on the applications. Some applications really need more than 2.1MP (the maximum for HDTV today) while others need higher resolutions due to i.e. larger areas being surveilled with one camera.
When upgrading an analog CCTV system, where coaxial cables has been used for transmision, it will without doubt be smart to choose HD. This will in fact reduce the costs for the customer as the exisiting cables can be used. If doing so it is important to be aware of the limitations in transmission distances when HD-SDI cameras are used.