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6-1 Datalogic Automation Inc.
CHAPTER 6
Appendix
This appendix explains several parts of Impact software in more detail.
Threshold Viewer
NOTE: The Histogram and Line Profile buttons in the Display Area toolbar are visible only when the Setup
tab is selected. To display the Threshold viewer in other tabs, right click on the ROI or image.
The floating Threshold viewer shows a Histogram or Line Profile, depending on the area of the image or
type of ROI selected. The Histogram or Line Profile graphically represents each pixel’s grey level within the
ROI or image. This shows how the VPM tools "see" images.
The Threshold view varies depending on the type of ROI and which tool is being configured. This is
explained in more detail below. These types of ROIs, and whole images, display a Histogram: Blob, Blob
List, Circle, Polygon, Rectangle, Rectangle List, Shape, and Shape List. These types of ROIs display a Line
Profile: Arc, Line, and Wide Line. The Wide Circular Arc and Wide Line Segment ROI types also display a
choice of Radial or Arc Profile types.
General Features
When the Threshold Viewer window is open, it always remains on top of the VPM window. A horizontal
splitter bar between the plot and options let you adjust the window split. The plot resizes when the window
is resized.
When the selected property is List ROI, all the ROI's in the list are represented in the Histogram. If no ROI
is selected, the entire image is represented in the Histogram.
If the Threshold Viewer is already displayed, the Histogram plot is refreshed when any of the following
events happen:
• A new ROI is selected.
• The selected ROI is unselected, for example, when you left-click on the image or select a non-ROI
property in the Properties tab. If you select a non-ROI property, the entire image’s Histogram is dis-
played.
• A new image is displayed.
• A new tool is selected in the task tree.
• You move to or from Settings-Camera or Settings-File Camera setups.
• VPM is in Live mode.
If the Threshold Viewer is already displayed, the Line Profile plot is refreshed when any of the following
events happen:
• A new ROI is selected.
• A new tool that has a Line ROI is selected in the task tree.