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If it's video switchers
Although not often used these days, some of the more obscure, programmable video switchers are capable of performing virtual display gymnastics.
Apart from allowing different dwell times to be allocated to specificly selected cameras, they can also omit 'tagged' cameras from the sequence, or even sequentially display individual cameras in a different order.
This type of advanced unit can be quite useful for certain types of higher security sites, particularly where different parts of the complex may experience varying levels of occupancy (or threat) at specific times of the day.
Generally speaking, most switchers will have one or possibly two video outputs, with normally a SPOT and SELECT arrangement available to feed two dedicated monitors. This allows an operator to review all (or some) of the connected cameras on a main monitor, with the option of 'Spot' viewing any particuler image which can be held for closer inspection on a second monitor.
With the multiple output units, these are generally designed as small desktop matrices, that can route perhaps up to 24 cameras out to maybe four or five different monitors. With a host of advanced features, these models can cover most eventualities, with alarm in, basic caption generation, and programmable display functions as standard. However, given their somewhat high unit cost, they are rarely used these days.
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