Omron F250-UME Software Manual page 993

Terminology
Term
Edge Code (EC) An edge code indicates the direction of an edge. The directions are indicated by arrows in
the following diagram.
Changes in brightness are detected as the edge and the direction of the change in bright-
ness is found. The direction of the arrows is determined by whether the measurement
image and the background are black or white.
Original image
The edge codes can still be used for low contrast images if image light difference and
change direction (edge code) processing items are used.
Calibration Calibration is the conversion of measurement results from pixels to physical units, such as
m
m, mm, cm, or m. Set the relationship between the physical coordinates and the camera
coordinates to convert the measurement results from pixels to physical units. To output
calibrated measurement results to an external device, set Coordinate mode/Calibration to
ON for each unit
Output coordinates Select the type of coordinates to be output to external devices.
Image used for settings
Before scroll
After scroll
Center of gravity The center of gravity is calculated by regarding the white pixels as a sheet of thick paper of
uniform thickness. The center of gravity is the point at which the sheet of paper would bal-
ance when placed on a sharp point. For example, the center of gravity for a circular object
would be the center of the circle. The center of gravity of a rectangular object would be the
intersection of lines drawn from diagonally opposite corners.
Circle: Black
Background: White
Circle: White
Background: Black
.
Reference position
This corner is the
model for position
compensation.
Outputs the coordinates before position com-
pensation.
The screen display will be the display set under
SYS/Conditions/Display settings.
Outputs the coordinates after position compen-
sation.
The screen display will be the display set under
SYS/Conditions/Display settings.
.
Explanation
Edge code image
Measurement image
(Image before
compensation)
(When the image is
displaced to the upper left)
Section 7-4
Image after
position compensation
The region outside the image
range becomes black.
X
0
Y
X
0
Y
7-(13)