CCTV Technology – Target Capture and Image Detail

It is important to consider the level of detail required in an image so that it matches the need of the user. This should be discussed with the client. The practical effect of this is that a camera may need to have a wider or narrower field of view so that the necessary amount of detail can be seen and that in some circumstances more cameras may be needed, either to increase the area covered with the same detail or to allow for different levels of detail to be seen from the same view.

Whether the different levels of detail can be achieved using a single PTZ or single camera of high resolution is a matter that should be agreed.

PURPOSEDESCRIPTIONRELATIVE VIEW
MonitorTo enable viewing of the number, direction and speed of movement of people across a wide area, providing their presence is known to the operator

12.5 pixels/m
DetectTo enable the operator to reliably and easily determine whether or not any target (e.g. a person or vehicle) is present.

25 pixels/m
ObserveTo enable characteristic details of an individual, such as distinctive clothing to be seen, whilst allowing a view of activity surrounding an incident.

62.5 pixels/m
RecognizeTo enable the operator to determine with a high degree of certainty whether or not an individual shown is the same as someone they have seen before.

125 pixels/m
IdentityTo enable identification of an individual beyond reasonable doubt.

250 pixels/m
InspectTo enable characteristic details of an individual, such as distinctive clothing to be seen, whilst allowing a view of activity surrounding an incident.

1000 pixels/m
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