Panasonic LightPix AE20 User Manual page 53

About inspection steps
The LightPIxAE20 separately searches an image similar to the template within the inspection area at
second and third steps. The number of steps varies depending on the inspection speed (settable in
CONFIGURATION mode) When the inspection speed is set to "High" or "Middle", inspection is performed at
three steps, and when it is set to "Low", it is performed at two steps.
When inspection is set to high/middle and low, the unit roughly estimates the position of the object at the
first and second steps and the first step respectively, then it finds out the exact position. At the first and
second steps, the unit searches by converting the saved image into the rough image (the rough images can
be searched more rapidly following these steps). At the final step, it detects the exact position of the object
(the image at the first step is rougher than the one at the second step). Following these steps enables the
LightPixAE20 to search the target image faster.
For reference
Roughness of image (The greater the value, the rougher the image)
Inspection
speed
The 1 st. step
High 8
Middle 8
Low 4
Detailed conditions
Detailed conditions mean the settable search conditions for each step. These conditions can be set in
CONFIGURATION mode. There are the following two detailed conditions:
•
Similarity Adjustment: Similarity Adjustments 1 and 2
•
The of Detected Candidates: Detected Candidates 1 and 2
Detailed conditions: Similarity adjustment value
What is similarity adjustment?
The degree that the image matches the template is called a "degree of similarity". The greater the degree of
similarity, the more similar the detected image. The lower the degree of similarity the less similar the
detected image. If you wish to execute a strict inspection in order to detect the target image, increase the
value, and if you wish to execute a rough inspection, decrease the value. Similarity adjustment means a
searching by adjusting (or lowering) the similarity adjustment value.
Once you set the similarity adjustment value, the unit searches based on the value that similarity
adjustment value was subtracted from the similarity value set in TEACHING and JUDGEMENT CRITERIA
SETTING modes.
Example:
Setting value
Similarity
Adjustment value (for the 1st. step)
Adjustment value (for the 2nd. step)
It is recommended that you use the Adjustment Similarity function in the following cases:
As described above, at the first and second steps, the unit searches the target image in a rough image.
Even if the degree of similarity is high for the original image, it becomes lower than the set Adjustment
Similarity for the rough image. This may results in detection failure. If you perform a strict (80 or more)
searching at the final step, it is recommended that you use this Adjustment Similarity function.
46
The second step
4
4
－
Adjusted degree
of similarity
st
80 The 1 . step
nd
20 The 2 . step
10 The final step
The final step
2
1
1
Description
60
=80-20=Degree of similarity-Adjustment1
70 =80-10=Degree of similarity-Adjustment2
80
= Similarity