Hardware manual

Design Tab Impact Reference Guide
Datalogic Automation Inc. 3-18
Histogram and Line Profile
NOTE: The Histogram and Line Profile views are not available for color images. To display the Threshold
Viewer, you can also right click on the ROI or the image.
The floating Threshold Viewer displays a histogram or line profile, depending on the area of the image or
ROI selected. The viewer graphically represents each pixel’s grey level to show how a VPM tool "sees" the
image (example below). For a detailed explanation of the Threshold Viewer, see “Threshold Viewer” on
page 6-1.
Region Of Interest
A region of interest (ROI) is a marked area on the video image. During an inspection, the vision system only
examines pixels within an ROI. Each image inspection tool has its own set of ROIs.
Several different ROI types are available: line, wide line, rectangle, circle, and polygon. The rectangle, cir-
cle, and polygon are used with tools that have a Shape List data type. A Grid ROI places multiple ROIs
based on a user-selected pattern.
NOTE: If an ROI is linked from another tool, you cannot move or reshape the ROI in the tool to which it is
linked.
You can select ROIs using keyboard keys while you are using the ROI Editor. The Tab key selects the next
ROI, Shift-Tab selects the previous ROI, Ctrl-Tab extends the selection to the next ROI, Shift-Ctrl-Tab
extends the selection to the previous ROI. Ctrl-A selects all ROIs.
Both the Tab select and the Select All methods operate on all ROIs that are visible and selectable in the ROI
Editor, unless a ListROI is selected and "locked." In that case, the methods will operate only on the ROIs in
that particular ListROI.
Typically, ListROIs are "locked" by a tool setup so, though many types of ROIs can be displayed to show the
results of setting up the tool, editing ROIs is restricted to those ROIs that represent a single tool property.
Shape List ROI Toolbar
Create Grid Cut Copy Paste Delete Save Zoom Histogram Line
ROI ROI Image Profile