Edge Strength Threshold: Edge
Profile
Graph
Figure 153. Edge Strength Threshold—Edge
Profile
Graph
For edge strength threshold, the x axis is the length of the ROI. The y axis has two measurements. The
first
is the light blue axis. It
represents Edge Strength, a measure of the rate of change of pixel grayscale values. The second is the dark gray axis. It represents Edge
Profile,
which gives the absolute grayscale level across the tool ROI. The blue line is the rate of change of the grayscale value along the
ROI. The two horizontal gray lines are the edge strength threshold plus and minus.
Point to a
location
on the graph—the corresponding
location
is the yellow line on the tool ROI displayed on the image.
Filters
Set
filters
for tool analysis.
Figure 154. Edge Tool Filters
Smoothing
Runs a rolling average along the ROI length. Smoothing
filters
out sharp changes in the edge
profile.
Note: A high
filter
number may miss the edge of a narrow line.
Minimum Edge Width
Filters out small spike-of-intensity changes, and narrow dark or bright bands. It determines the distance before and
after
an
edge that must be free from
additional
transitions
or the end of the ROI before the edge is recognized as valid.
Note: A high
filter
number may miss the edge of a narrow line.
VE Series Smart Camera
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