Sample Rate
The sample rate sets the number of samples per pixels (one sample per pixel, two samples per pixel, etc.). The sample rate
determines the sub-pixel
resolution,
which increases the
resolution
of the tool, and increases the
inspection
time.
Figure 146. 1 px Wide ROI
Figure 147. 13 px Wide ROI
Threshold
The Threshold parameter marks the grayscale
transition
point.
The tool marks the edge where the pixel intensity crosses the threshold level. From the Threshold Type list, select one of the following:
• Absolute
•
Relative
(default)
• Edge Strength
Threshold Type: Absolute
Finds an edge at a
specific
grayscale level.
Figure 148. 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
VE Series Smart Camera
88
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