Panasonic PV500 User Manual page 222

Intersecting Angle
Specify one of the three methods to detect the angle between two intersecting lines.
Line specified in Reference No.0
Acute Angle
When the direction of a line changes, the detected angular positions differ between CW and CCW.
The following is the case that the direction of line in Reference No.1 is reversed.
Acute Angle
The intersecting angle and median is output as below when two lines are not intersected.
When two lines are headed in the same
direction
Intersecting Angle Error ( E0072 )
Median It is calculated with the same direction and
angle as the two lines.
220
Line specified in Reference No.1
CW
In case of CW or CCW, the start position is the line specified in Reference
No.0.
CW
CCW
CCW
When two lines are headed in different
directions
Error ( E0072 )
A line passing through the center of the
image is calculated, which is the angle of
Line No.0 + 90 degrees.