User`s manual

Image amplitude is also high where the object appears in
the FOV. Figure 6.9 shows the Line Image amplitude
changes between a white background and black and
medium gray objects.
Fgure 6.9 Line Image Ampliide: Black and Gray Obiects
Black Object
Black-gray-black
amolitude
Edge Height
The edge height parameter specifies the minimum contrast
that must exist between an inspected object and its
background before the SLS can detect its edges. Edge
height values range from 1 to 10. The larger the edge height
value specified, the higher the minimum required contrast.
The utility of the edge height parameter lies in its ability to
mask out low-contrast visual “clutter” objects that appear
in the Line Image as low amplitude “noise.” If the contrast
of the clutter is relatively low, you can try raising the edge
height value to the point where the SLS does not detect an
edge on any of the clutter objects.
The Line Image in Figure 6.10 is an example of how this
might appear with one clutter object and one inspected
object. In this example, the edge height value is set to 3.
Note that the small “x” (identifying the fmt edge) is
located on the clutter object.
Figure 6.10 Unwanted First Edge Detection on a Wutter” Object
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