... system),like perimeter detection,items care, flowmeter, abnormal video signal diagnosis17. DVR,NVR and HVR, 3 in 1.18. ... system), like perimeter detection, items care, flowmeter, abnormal video signal diagnosis.1 Permeter detection (PEA)(1) touch line detection: ... for flow statistic in simple indoor narrow passage.4 Abnormal video signal diagnosis (AVD)Auto- detect that there is mess of ...