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Image quality is measured against the Rotakin® standard. The Rotakin® target was developed by HOSDB (Home Office Scientific Development Branch) as a means of auditing the efficiency of a CCTV system. It consists of a human silhouette target 1.6m in height. When the target fills the screen vertically it is said to be 100%R.
Monitor – Not Less than 5%R
Detect – Not Less than 10%R
Recognition – Not Less than 50%R
Idenification – Not Less than 120%R
The quantity and location of cameras will be site specific. They must meet the requirements identified within the O.R. (Operational Requirement) procedure.
All cameras must produce colour images to enable accurate identification of offenders.
All external public access doors must be fitted with cameras which enable clear, unobstructed images of all persons entering/exiting the premises. Where practicable, these cameras should be mounted internally. Such cameras must be mounted at a suitable height – looking towards, rather than down at the doorway. These cameras must be capable of producing HOSDB Identification standard images (a minimum of 450TVL resolution and 120% Rotakin® screen target height) at the monitor.
All internal cameras must be capable of producing HOSDB Recognition standard images (a minimum of 450TVL resolution and 50% Rotakin® screen target height) at the monitor.
CCTV Cameras are susceptible to interference and vandalism. Cameras should be fitted with robust anti-tamper housings to prevent such actions.
All cameras must be a minimum standard of 450 TVL. They must have back light compensation, direct drive or amplification capability, and a sensitivity of a minimum of 1 lux.