Omron F250-UME Software Manual page 439

EC Circle Count
2-19-2 Extracting Edges
Upper and Lower Limits
Low contrast with background
High contrast with background
Mask Size
CHECK
EC circle count is performed for images for which the edges have been
extracted.
Adjust the upper and lower levels for edge extraction if there is low contrast
between the measurement object and the background and to remove noise.
Set the level to which the background will be cut. The levels can be set
between 10 and 255 (default 100:255).
Areas with a density above the lower limit will become the edge of the mea-
surement object. Refer to the following examples and adjust the upper and
lower limits.
Example: Cannot Find Edges Due to Low Contrast
Edge-extracted image
Cannot find edges
Example: To Remove Noise
Edge-extracted image
Example: Other Edges Clearly Extracted But Cannot Find Desired Mark
Edge with Stability
Edge-extracted image
The mask size function is used when searching for edges to judge edges
using peripheral information. Select how much peripheral pixel information to
use. The selections are 5
This setting will be enabled only if Frame/Field under Camera image is set to
Frame. If set to Field, the effect will remain the same as if 5
even if 3 3 is selected.
Reduce lower limit.
Increase lower limit.
Reduce upper limit.
5 (default) or 3 3.
™
Example: Select to 3 3
Information from the surrounding
9 pixels is used to determine
whether or not the center pixel is
the edge. (1 square = 1 pixel)
Section 2-19
The edges of low
contrast sections also
clearly extracted.
5 is selected
2-19-(4)