Question 1

What is pixel density in CCTV?

Accepted Answer

Pixel density (PPM — pixels per meter) measures how much detail a camera captures at a given distance. Higher PPM means more detail. Standards define minimum PPM for different tasks: 25 PPM for detection, 62 PPM for observation, 125 PPM for recognition, 250 PPM for identification.

Question 2

What pixel density do I need for face recognition?

Accepted Answer

For reliable face recognition, you need at least 125 pixels per meter (PPM). For forensic-quality identification, aim for 250 PPM or higher. This determines the maximum effective distance for your camera and lens combination.

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