Omron FZ4 Series User Manual page 82

Erosion
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When there is bright noise in an image, bright areas are contracted to eliminate bright noise.
3
When contrast of measurement images is low (defect inspection is unstable)
The filtering items "Extract vertical edges", "Extract horizontal edges", and "Extract edges" are effective.
Extract vertical edges
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This extracts the vertical edges of an image.
Extract horizontal edges
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This extracts the horizontal edges of an image.
Extract edges
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This extracts the all edges of an image.
When unidentifiable shapes are present
The filtering item "Extract edges" is effective.
Extract edges
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This is used to make the profile clearer and the shape more identifiable.
80 Key Points for Adjustment FZ4 User's Manual