Terminology - Omron F160 Operation Manual

Terminology

7-1

Terminology

HELP
Term
Binary Binary refers to the separation of the density images with 256 gradations read by the Cam-
era into black pixels and white pixels. Upper and lower threshold values (binary levels) are
set and the parts of the density image that fall within that gradatiion range are converted to
white pixels and the rest are converted to black pixels. The F160 uses the white pixels to
measure the object.
Density image
Calibration is the conversion of measurement results from pixels to physical
Calibration
units, such as µm, 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 measurement
item.
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.
Correlation The extent of conformity with the model is expressed as a correlation value. A correlation
value between 0 and 100 is displayed. The higher the correlation value, the more similar
the input image is to the model.
Density image Density images are the gray images of 256 gradations read by the Camera.
322
This section explains terms listed beside the HELP icons. Terms explained in
the main body of the manual are not listed here.
Binary level
Binary image
Upper
Lower
Reference position
This corner is the
model for position
compensation.
Refer to page 290.
Outputs the coordinates before position
compensation.
The screen display will be the display set
under SYS/Conditions/Display settings.
Refer to page 290.
Outputs the coordinates after position com-
pensation.
The screen display will be the display set
under SYS/Conditions/Display settings.
Explanation
Measurement image
(Image before
compensation)
(When the image is
displaced to the upper left)
Section 7-1
Image after
position compensation
The region outside the image
range becomes black.
X
0
Y
X
0
Y