Banner PresencePLUS P4 COLOR Series - Manual (Page 162)

Edge Strength
Edge strength measures the rate of change of grayscale values and needs sharply-defined transitions. Edge strength
is more tolerant of gradual changes in light levels across the tool than other transition types and it will filter out weak
or gradual edges.
Description Field
Enter an edge bandwidth value from 1 to 255. Edge
Polarity
• Bright to Dark finds edges that start above the threshold value and cross below the
threshold value.
• Dark to Bright finds edges that start below the threshold value and cross above the
threshold value.
• Bright or Dark finds any edge.
Graph Tab
When Edge Strength is selected in the Input tab, the software displays the Graph tab. This tab provides similar
information to the Input tab, but displays separate Edge Profile and Edge Strength graphs for easier viewing.
The Edge Profile graph represents the absolute gray scale level across the tool ROI.
The Edge Strength graph represents the change in gray scale along the tool ROI. Edge Strength detects an edge when
the rate of change (solid red line on the graph) crosses the selected intensity change amount (dashed green lines on
the screen).
Banner Engineering Corp. Minneapolis, MN USA 162
2/2010 PresencePLUS Software Tools