Choosing a digital video system

June 2002 CCTV, Surveillance & Remote Monitoring

When considering the implementation of a digital video system over a network, customers often do not ask the right questions, for example: how many frames per second can be actually transmitted utilising the bandwidth they have available and what is the size and cost of the video storage media necessary to store on-line the information for the required period of time?

Realtime video typically requires 25 fps, this will provide jerk-free images, however, the human eye sees 18 fps as jerk-free as demonstrated by film animators. Cartoons are created using individual images (cells) each with slight changes, when projected at 18 fps these appear to be free flow movement.

Furthermore, images recorded in realtime (25 fps) and with no compression require huge storage systems (computer hard disks) and devour massive bandwidth within a corporation's network infrastructure, which incidentally is installed to cater for the core business and not to transmit video traffic. Such information and bandwidth requirements are often lost in the small print of the data sheets and many clients are horrified at the impact the massive additional traffic has on their network and business operations.




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