User`s manual

Figure 6.7 shows the same image with the SLS properly
aimed and positioned (larger size), but still out of focus.
Fgure 6.7 Object Property Aimed and Positioned
Figure 6.8 shows the image with the SLS properly aimed,
positioned, and focused (the object’s edges are nearly
vertical).
Figure IS Obieci Properly Aimed, Positioned, and Focused
*Edge Height and Edge Span Parameters
Most of the SLS analysis functions must locate the edges of
the inspected object in order to perform their inspection
function. (Exception: Full field texture recognition.) This
requires stable edge detection. Thus, when setting up your
application, in order to ensure that the SLS can detect the
inspected object’s edges reliably, you should always use the
1-D Spatial Measurement function fmt, to verify edge
stability (or establish it, if necessary), before switching to
another function.
The edge height and edge span parameters control when the
SLS detects an edge within the FOV. Generally, the SLS
detects an edge whenever it sees a specified change in
image contrast within a specified distance along the FOV.
As Figure 6.2 (page 6-3) shows, contrast changes appear
as changes in the amplitude of the Line Image. When the
contrast between the inspected object and its background is
high (a black object against a white background), the Line
‘Not available in Main Menu View Image option.
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