The object must fill at least 5% of the frame in order to be distinguishable from other projects. One must be able to distinguish between a person or an object/overview image of what is happening in an area.
The object's height must be at least 10% of the image height. A video motion detction (VMD) system must be able to detect a movement/get a detailed overview of an area.
To recognize a person or an object the person or object must be at least 50% of the image height. One must be able to recognize a person or recognize a typical characteristic of a person.
To be able to identify a person on a TV screen the person must be represented in close-up and be 120% of the image height. The image must be so detail-rich that the person can be identified when one compares the video image with a photograph.
The Purpose of Video Surveillance is to discourage criminals. but if a crime does take place it also makes it possible to establish the course of events and identify the people and objects involved. To Optimize the use of video surveillance system the following criteria should be met.