Omron FH-1 series User Manual page 236

6 Performing Measurement and Adjustment
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 pat-
terns during defect measurement.
Refer to Filtering in the Vision System FH/FHV/FZ5 Series Processing Item Function Reference Man-
ual (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.
Weak Smoothing
Before 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 with Low Contrast (Defect
Inspection Is Unstable)
The Extract Vertical Edges, Extract Horizontal Edges,
and Extract Edges filtering items are effective.
• Extract Vertical Edges
This extracts the vertical edges of an image.
Extract Vertical Edges
Before Processing
• Extract Horizontal Edges
This extracts the horizontal edges of an image.
• Edge Extraction
This extracts all edges of an image.
6 - 6
Measurement Images That Contain Noise The
Dilate and Erosion filtering items are both effec-
tive.
The Dilate and Erosion filtering items are both
effective.
• Dilate
• Erosion
After Processing
When Unidentifiable Shapes Are Present
The Edge Extraction filtering item is effective.
• Edge Extraction
After Processing
When there is dark noise in an image, bright areas
are enlarged to eliminate dark noise.
When there is bright noise in an image, bright areas
are contracted to eliminate bright noise.
Erosion
Before Processing
This is used to make the profile clearer and the
shape more identifiable.
Edge Extraction
Before Processing
Vision System FH/FHV/FZ5 Series User's Manual (Z365)
After Processing
After Processing