Threshold Type: Absolute
Finds an edge at a
specific
grayscale level.
Figure 185. Absolute Threshold Parameters
While Absolute threshold is less likely to
find
a false edge than
Relative
threshold, it may miss edges if the light level changes between
inspections.
Absolute Threshold: Value
Enter a
specific
grayscale value from 0 to 255.
Edge Polarity
Edge Polarity
defines
the type of edges that the tool
finds.
• Dark to Bright—Finds edges where pixel
intensities
start below the threshold value and cross above the threshold value
• Bright to Dark—Finds edges where pixel
intensities
start above the threshold value and cross below the threshold value
• Bright or Dark—Finds any edge
Absolute Threshold: Edge
Profile
Graph
Figure 186. Absolute Threshold—Edge
Profile
Graph
For absolute threshold, the x axis is the length of the ROI. The y axis is the actual grayscale value from 0 to 255. The light blue line shows
the absolute pixel intensity. The horizontal gray threshold line moves up or down with the threshold value.
Point to a
location
on the graph—the corresponding
location
is the yellow line on the tool ROI displayed on the image.
VE Series Smart Camera
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