Megapixel technology permits more data and control features such as perspective correction, light level compensation, and fixed field pan-tilt-zoom. The higher the resolution, the more details can be seen in an image. This is a very important consideration in video surveillance applications, where a high resolution image can enable a criminal to be identified.
The maximum resolution in NTSC and PAL, after the video signal has been digitized in a DVR or a video server, is 400000 pixels (704x576 = 405504). 400000 equals 0.4 Megapixel. Using the CIF format, i.e. a quarter of the image, the resolution is down to a mere 0.1 Megapixel.
Megapixel network cameras also bring the benefit of different aspect ratios. In a standard TV, an aspect ratio of 4:3 is used, while movies and wide-screen TV use 16:9. In a network camera any aspect ratio can be used.
In addition, digital pan/tilt/zoom can be achieved, where the operator selects which part of the megapixel images should be shown. This does not imply any mechanical movement from the camera. It ensures much higher reliability and makes it possible for different operators to pan and tilt to different areas of the image simultaneously.
Keep in Mind
There are a few important items to remember. One is backlight compensation. Automatic exposure technology is designed to adjust the lightness of an image to appear as it does to the human eye and can be fooled by light sources such as headlights, sun and glare moving into the camera’s field of view.
Large images require more data than small images. Highly compressed images require less data than images using low compression. Scenes with a lot of detail generate more data than scenes with little detail. Ample resources are available to assist in educating you on New Video. The transformation from video is happening now. Choose your technology partners carefully and don’t be left behind.