Hcam is the height of the camera from ground in meters
MaxH is the approximate height of the center of the head of a person in meters
PAN and TILT are angles referring to the camera orientation
HalfHFoV and HalfVFoV are respectively half of the horizontal and vertical camera Field of View
The internal darker rectangle/trapezoid shows the effective area where heads of the people are visible and so, where the algorithms where head and shoulders are used give best results
Change values moving the sliders’ cursor
Rotate 3D view clicking and dragging in any position of the 3D section