2-23-(18)
ECM Search
Section 2-23
2-23-6
Setting Search Regions
Set the region to search for the model. The whole region of the input image
can be searched. Processing time can be reduced and accuracy improve,
however, by limiting the search 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.
An arrow cursor will appear.
The model will be displayed with solid lines.
2.
Draw a box-shaped 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
1.ECM search
Measurement image
Extract edges
Measurement conditions
Model registration
Search coordinate
Search region
Judgement conditions
Detailed conditions
Coordinate mode
Search region
80,66
Model
