Table of Contents
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Sequence
Sequence is an order to search a template within a search area.
There are up to five phases for searching. Sequence starts
searching based on the compressed information about template
and search area. The compression rate of the information lowers
every time a searching phase proceeds. But, the higher
compression ratio, the faster searching speed. The lower the
compression ratio, the slower searching speeds. In addition, as
the compression rate lowers, searching can be performed using
the image similar to the original image.
When setting a template and search area, the recommended sequence is automatically set based on the area
size. Follow the steps below to change the items and setting values for the sequences.
The Items can be Changed Using Sequence
Item
Details
Phases
Searching is performed at up to five phases by changing compression ratio and other conditions.
You can set the five phases from the 1st and to 5th.
Accuracy
Accuracy is a compression ratio described above. There are six types of compression ratio, 16, 8, 4,
2, 1, S. Accuracy 16, for example, refers to a compression of 16 x16 pixel information (total pixels:
256). Therefore, the smaller pixels the lower compression is. Accuracy value must be smaller as a
scanning phase proceeds. Accuracy "1" means that searching is performed without compressing the
information. Accuracy "S" means that detection is executed per subpixel. If the accuracy is set to "1"
or "S", the phases after that will be erased and no more phases can be added. (You can include both
"1" and "S" in one sequence. Example: phase 4TH=Accuracy 1, phase 5TH=Accuracy S)
Det. Max.
Maximum value of the parts to be detected at the desired phase. If the number of the parts having
the degree of similarity higher than the minimum correlation value is larger than the setting value for
"Det. Max.", the parts having the highest degree of similarity are detected first.
Corr. Min.
At the desired phase, detects the images having the degree of similarity higher the setting value for
"Corr. Min.". If the PV310 cannot detect such an image, it will finish searing and output "NG".
The Items Can Be Confirmed Using Sequence
Item
Details
Det. Count
Number of the parts that were detected at the desired phase
Corr.
Correlation value of the parts that were detected at the desired phase. If multiple parts are detected,
the lowest correlation value will be displayed.
Correlation Value for the Low Contrast Function
If "Inspection Object" is set to "Low Contrast", the correlation values displayed in the table under Sequence tab
and the correction values that are output as an inspection result are different. This is because the PV310
makes up the correlation values that were affected by the distorted, chipped or overlapped parts of the object
and output them as inspection results. The correlation values in the table under Sequence tab are the ones that
have not been adjusted and the correlation values in the table under Result tab are the ones that have been
adjusted. Therefore, the former is lower than the latter. But, if there are many distorted or chipped parts in the
whole object image, the parts are not adjusted and almost the same correlation values may be output.
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