Omron F250-UME Software Manual page 536

ECM Search
CHECK
STEP 2: Masking Sections Not Required
CHECK
2-23-(9)
The model is registered internally using the edge-extracted image.
The section in the input image that is closest to the model is found. The
degree of similarity is expressed as the correlation, and the search coordi-
nates (X, Y) are found.
Search
If, however, there is noise in the model itself, the correlation will be reduced
because noise becomes part of the search. In such cases, use the mask
function to remove noise from the model before registration.
Sections in the model that are not required can be masked and removed from
the model. The registered model image does not get cleared when using this
function so the image can be used repeatedly to try different model shapes to
find the most suitable one.
The box drawn using Registration is registered as Figure 0 and the position
and size of that box can be adjusted.
If a box figure is not suitable, clear the box and use OR mode to draw a circle
or polygon. Up to 8 figures can be drawn.
Model
The model for the edge-
extracted image can be
checked on the Mask Screen.
Only the edges of the model are used
for the search so noise does not affect
the correlation.
Mask function used.
Use the NOT mode to draw figures
and mask sections that are not
required in the model.
Draw a circle using OR mode
(The original box is cleared).
Draw figures in NOT mode to
exclude sections not required.
Section 2-23