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Transcript
PresencePLUS Software Tools 2/2010 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. Field Description Edge Enter an edge bandwidth value from 1 to 255. 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 O RI. 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). 166 Minneapolis, MN USA Banner Engineering Corp.
