Omron F250-UME Software Manual page 392

EC Positioning
STEP 2: Setting the Search Region
CHECK
CHECK
2-16-(9)
The Measurement Conditions Settings Screen will be displayed.
Measurement conditions
5. Make the settings for each item.
6. Select End.
The settings will be registered and the screen in (3.) will return.
Set the region to search for the positioning mark.
Adjust the search region if there are areas not to be included in circle
searches.
When edges are extracted, the pixels at the edges of the screen cannot be
processed accurately. Do not include the outer edges of the screen when set-
ting the search region.
Screen size
512 pixels
484
pixels
Valid range:
(0,0) to (511,483)
Each time the image is filtered, the range of inaccurate pixels will be increased
further. For example, if filtering is performed twice, the valid range will be
reduced as follows:
Filter size of 5 5: -2 pixels
Filter size of 3 3: -1 pixel
(Filtering is also performed once in edge extraction, so filtering is actually per-
formed a total of three times.)
The search can be performed even if the whole circle is not within the search
region, as long as the center of the circle is within the region.
Search region
Circle color : Black
Skipping :
ON
Circular value : [ 0]%
End
™
Filter size of 5 5
-2 pixels
Valid range:
(2,2) to (509,481)
3 = -6 pixels
3 = -3 pixels
Circle center
Search region
Section 2-16
™
Filter size of 3 3
-1 pixel
Valid range:
(1,1) to (510,482)