Particularly facial recognition systems. They can be integrated with other biometric technologies, such as iris scanning, palm print readers, voice recognition and fingerprint readers. A Facial recognition System is a computer application which verifies a person from a digital camera.

The process involves:

• Capturing the image

• Finding a face in the image

• Extracting details of features

• Comparing details of extracted features with templates (details collected earlier)

• Declaration of matches

Algorithms programmed into CCTV systems can be used to detect particular events or patterns of behaviour. The oldest algorithm is VMD or Video Motion Detection. This picks up any movement above a certain size or sensitivity in a defined area. Modern algorithms may detect actual patterns of behaviour.