The false positive rate is the real specification
Detection accuracy is the figure buyers ask for. The figure that decides whether a system stays switched on is the false positive rate, because an operator woken by noise learns to dismiss the alert. ARGUS ran at 97.8% detection accuracy with a 0.18% false positive rate across more than forty concurrent feeds. Reaching that is architecture rather than a threshold setting: motion gating ahead of inference, fusion instead of one detector’s opinion, three-level grading, and a cooldown policy so one event produces one alert.
