The problem with this approach is it's crude. This threshold is intended to eliminate false positives from, for example, curtains blowing in the wind or dogs wandering about. These usually operate by software monitoring all or part of the video frame for changes in pixel data that exceed a certain threshold. So how do you find the bits containing people? Many video systems let you set up movement triggers to flag events. There are cameras in reception, the loading bay, the hallways, the data center … pretty much everywhere, and you accumulate footage by the gigabyte every day. You've got cameras all over your facility. From the world of AI comes really advanced and very low-cost intelligent video surveillance.
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