2-6-(9)
EC Position Compensation
Section 2-6
STEP 2: Setting the Search Region
Set the region to search for the positioning mark.
Adjust the search region if there are areas that are not to be included in circle
searches.
CHECK
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.
CHECK
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.
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
3 = -6 pixels
Filter size of
3
3: -1 pixel
3 = -3 pixels
(Filtering is also performed once in edge extraction, so filtering is actually per-
formed a total of three times.)
1.
Select Search region.
Search region
Circle center
Search region
Screen size
Valid range:
(0,0) to (511,483)
Filter size of 3
3
484
pixels
512 pixels
-1 pixel
Filter size of 5
5
Valid range:
(1,1) to (510,482)
Valid range:
(2,2) to (509,481)
-2 pixels
Measurement
conditions
Search region
Radius
Reference registration
Judgement conditions
Clear
Position0(Circle)
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