Omron F250-UME Software Manual page 249

Detecting Binary Defects
2-12-3 Setting Measurement Regions
Gravity and Area
CHECK
CHECK
Gravity and Axis
Up to eight measurement regions can be set.
There are three measurement methods for binary defect detection: Gravity
and area, gravity and axis, and area (variable box). Different measurement
methods can be set for each region. Select the measurement method suitable
for the objects to be inspected.
Use a gravity and area measurement to find the size and position (center of
gravity) of a measurement object.
Area
The area is the number of white pixels in the measurement region.
Center of Gravity
The center of gravity is the center of the area of white pixel. When the white
pixel area of the region forms a square, the center of gravity is the intersection
of the lines from diagonal corners.
If the number of white pixels is the same, the measurement result will be OK
even if the shape of the measurement object is different. Use pattern detection
to distinguish between measurement object shapes.
Use an area (var. box) measurement for measurement objects with varying
measurement region sizes or positions.
Use a gravity and axis measurement to find the angle of a measurement
object.
This measurement method also calculates the axis angle, in addition to the
binary center of gravity and area calculations described previously.
Measurement region
Center of gravity of the white pixels
No. of white pixels = area
Measurement region
Axis angle
Center of gravity of white pixels
No. of white pixels = area
Section 2-12
2-12-(6)