Panasonic PV500 User Manual page 202

Smart Edge (Line)
This checker detects an object in the same method of Smart Edge
(Line)
When the horizontal base checker and vertical base checker are
both set, the intersection point of two approximate lines will be
considered as the base position.
When only the horizontal base checker or vertical base checker is
set, the intersection point of the approximate line and the line passes
through the center of the inspection area will be considered as the
base position.
Position/Rotation Adjustment
Feature Extraction (Principal Axis Angle)
This checker detects the gravity center and the
principal axis angle of an object in the same method of
Feature Extraction checker. It considers the detected
coordinates of the gravity center and the angle as a
base position and base angle respectively. The range
of a detected angle is +/- 90 degrees.
Matching 360-degree
This checker detects the position of an object
(output point coordinates) and the rotation angle in
the same method of Smart Matching. It considers
the detected coordinates and the angle as a base
position and base angle respectively.
Subtraction function of Matching checker is not
available.
Feature Extraction (2 checkers) and Matching (2 checkers)
It considers an angle which are formed by X axis and a line between
two gravity centers detected by two Feature Extractions or between
two output points detected by two Smart Matchings as a base angle.
And also it considers the middle point of the line as a base position.
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