6-2
Key Points for Adjustment
This section describes key points for adjustment to improve measurement precision and shorten
measurement time.
6-2-1
Stabilizing Measurements
This section describes key points for adjustment when measurements are not stable. There are two
methods for improving measurement precision: Performing processing of images loaded from the
Camera (filtering) or adjusting settings and parameters.
Adjusting Parameters of Each Processing Item
Adjustment to improve precision and stability depends on the processing item.
Refer to Key Points for Adjustment for individual processing items in the Vision System FH/FHV Series
Processing Item Function Reference Manual (Cat. No. Z341).
Processing Images (Filtering)
There are cases in which high-precision measurement is impossible, such as when using images
loaded from the Camera that have noise, irregularities, or low contrast or when the background has
patterns during defect measurement.
Refer to Filtering in the Vision System FH/FHV Series Processing Item Function Reference Manual
(Cat. No. Z341).
When measurement images have irregularities
(searching and location positioning are not stable)
The Smoothing (Strong and Weak) and Median filter
items are both effective.
• Smoothing (Strong and Weak)
This processing changes the shade of images so
that irregularities are not as easily seen.
Before Processing After Processing
• Median
In comparison with smoothing, the Median filter item
allows for irregularities to be hidden without having
to shade the edges of images.
Measurement Images That Contain Noise
The Dilate and Erosion filtering items are both effec-
tive.
• Dilate
When there is dark noise in an image, bright areas
are enlarged to eliminate dark noise.
• Erosion
When there is bright noise in an image, bright areas
are contracted to eliminate bright noise.
Before Processing After Processing
Erosion
6 Performing Measurement and Adjustment
6 - 4
FH/FHV Series Vision System User’s Manual (Z365-E1)
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