Omron F250-UME Software Manual page 250

Detecting Binary Defects
CHECK
Area (Var. Box)
Measurement region
2-12-3-1 Gravity and Area
(As required) (As required)
1
2
Change Set mea-
binary level surement
for each conditions.
region.
STEP 1: Changing Binary Level for Each Region
2-12-(7)
Axis Angle
The axis angle is the angle of the major axis of an ellipse that is diagrammati-
cally equivalent to the area occupied by the white pixels.
More processing time is required to calculate the axis angle. To simply find the
area and center of gravity, use a gravity and area measurement.
Use an area (variable box) measurement to adjust the measurement region (a
box) for measurement objects with varying sizes or positions and find their size
and center of gravity.
The upper, lower, left, and right edges of the measurement object are found.
The measurement region will be on the inside of the edges that were found.
Left edge
With the edges detected, the Controller can determine where the measure-
ment object is. Even if the size and position of the measurement object
changes, the Controller can move the measurement region appropriately.
Once the edges have been found, the image is converted to a binary image
and the area and center of gravity of the measurement region are found.
Density images taken by the Camera are converted to binary images, made
up of black and white pixels. The size (area) and position (center of gravity) of
the area occupied by the white pixels are measured. Refer to page 2-12-(6).
3
Draw mea-
surement
region.
Perform this operation to change the binary level for each region.
Set the level for converting 256-gradation images into binary images. Mea-
surements are performed for the white pixels. Therefore, make the settings so
that the measurement object is white.
Upper edge
Measurement region
Right edge
Lower edge
Measurement region
(As required)
4 5
Re-register Set
reference judgement
values. conditions.
Section 2-12
(As required)
6
Change
pixel
skipping.