CCTV Systems Go Digital

Digital video delivers improved quality, which enables more details and changes in images.


With the introduction of network cameras and PC-based image processing and storage, Closed Circuit television systems are destined to become 100 percent digital. As modern security management insists on more video surveillance, and legacy CCTV systems wear out and require repair and upgrades, the...


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JPEG compression can be done at different user-defined compression levels, which determine how much an image is to be compressed. The compression level selected is directly related to the image quality requested.

Motion JPEG offers video as a sequence of JPEG images. Motion JPEG is the most commonly used standard in network video systems. A network camera, like a digital still picture camera, captures individual images and compresses them into JPEG format. The network camera can capture and compress, for example, 30 such individual images per second (30 fps — frames per second), and then make them available as a continuous flow of images over a network to a viewing station. At a frame rate of about 16 fps and above, the viewer perceives full motion video.

Automatic exposure technology is designed to adjust lightness of an image to appear as the human eye. It can be easily fooled by light sources like headlights, sun and glare moving into the camera's filed of view. Backlight compensation circuits are designed to ignore small areas of high illumination.

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