Structure about distance changed detection parameters.
struct{ NET_VCA_POLYGON struRegion; float fSpacingThreshold; BYTE bySensitivity; BYTE byDetectMode; WORD wDuration; }NET_VCA_SPACING_CHANGE, *LPNET_VCA_SPACING_CHANGE;
Coordinates of detection region, refer to the structure NET_VCA_POLYGON for details.
Distance threshold, range: [0,10.0], default: 1.0, unit: m
Sensitivity, range: [1,100]
Detection mode, compared with distance threshold: 1-more than, 2-less than
Event time duration, unit: second, which ranges from 1 to 3600, default: 2