HIKVISION NVST HNR Series User Manual page 156

Check Enable Line Crossing Detection.
Optionally, check Save VCA Picture to save the captured pictures of line crossing detection
pictures.
Follow the steps to set the line crossing detection rules and detection areas.
Select Arming Area. Up to 4 arming areas are selectable.
Select the Direction as A<->B, A->B, or A<-B.
A<->B: Only the arrow on the B side shows. An object crossing a configured line in both
directions can be detected and trigger alarms.
A->B: Only an object crossing the configured line from the A side to the B side can be
detected.
B->A: Only an object crossing the configured line from the B side to the A side can be
detected.
Set the detection sensitivity range. The higher the value is, the easier the detection alarm will
be triggered.
Click Draw Area and set two points in the preview window to draw a virtual line.
Draw the maximum size/minimum size for targets. Only the targets in the size ranging from
max.size to min. size will trigger line crossing detection.
1) Click Max. Size/Min. Size.
2) Draw an area in preview window.
Network Video Recorder User Manual
Line Crossing Detection
155