Image SubtractionFH/FZ5 Processing Item Function Reference Manual
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Compensate image
Disp. Image Sub. (Image Subtraction)
Set the method for extracting the difference images. Set this option when the difference cannot be extracted
correctly such as when there are a lot of noises.
1 In the Item Tab area, click [Disp. image sub.].
2 Set each item in the "Revision
processing" area.
3 Set the difference judgement value in the
"Subtract parameter" area.
Setting item
Setting value
[Factory default]
Description
Normalization
• Checked
•[Unchecked]
Select whether to perform normalization based on the brightness in the
registered model.
When "Checked" is selected, the density is adjusted before difference
extra
c
tion, so that the difference extraction is not affected by changes in
the total image brightness or the lighting fluctuations.
When normalization is performed on the measured objects without
p
atterns, the total image brightness is changed and the extraction does
not work correctly.
Perturbation
• Checked
•[Unchecked]
If you place a check here, in order to prevent mistaken detection of slight
positio
nal
deviation of measurement objects as differences, corrections
are made before difference extraction.
However, this requires more processing time.
Setting item
Setting value
[Factory default]
Description
Difference
0 to 255
[50]
This sets the reference grayscale used when calculating differences
between the model and the inspected object image.
Pixels with a difference equal to or grea
te
r than Difference are converted
to white and other pixels are converted to black, so that only defects are
converted to white and measured.
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