Hardware manual

Point to Point Measurement Impact Reference Guide
Datalogic Automation Inc. 3-138
How Point Matching Works
Matching begins by selecting successive points in the ideal point list. Each ideal point is matched to an
actual point by a tolerance check until the ideal point list is exhausted. Ideal points without a match are
added to the missing points list. Actual points which have not been matched to an ideal point are put into the
extra points list.
NOTE: If the Tolerance value is too high, missing and extra point locations are reported incorrectly.
How Tolerance Regions Work
There is a Shape List output named “Tolerance Region." These regions consist of circles or squares centered
on the Ideal Points with a distance equal to the Tolerance input. For example, if you set Tolerance to fifteen,
Enable Tolerance Regions to True, Enable Radial Offsets to True, and press Train; Tolerance Regions are
displayed on the image as purple circles fifteen pixels in diameter. The Regions are contained in the Toler-
ance Regions output in the properties list. The regions are circles because Enable Radial Offsets is true.
Point to Point Measurement
In the Measurement Drawer
The Point to Point Measurement tool measures the distance between two points. A Setup is available for this
tool, which simplifies basic configuration. See “How to use the Point to Point Measurement tool” on page 3-
139.
Missing Points The points in this list were found in the ideal point list, but had no match-
ing point within tolerance in the actual point list.
Radial Offsets A list of radial distances from each ideal point to the corresponding
actual point. missing points have a distance of zero.
X-Offsets A list of distances from each ideal point to the corresponding actual point
along the x-axis. Missing points have a distance of zero.
Y-Offsets A list of distances from each ideal point to the corresponding actual point
along the y-axis. Missing points have a distance of zero.
Tolerance Regions These consist of circles (Radius Offsets) or squares XY-Offsets) cen-
tered on the Ideal Points with a radius or length and width equal to the
Tolerance input. See “How Tolerance Regions Work” on page 3-138.
Input Name What it is
Input Image Linked Image
Tool Origin The tool’s origin relative to the entire image space
Point One The x and y coordinates of the beginning measurement point
Point Two Origin
Source
Use Tool Origin: Select this if Point Two is located on the image relative
to the Tool Origin property.
Use Point Two Origin: Select this if Point Two is located on the image rel-
ative to the Point Two Origin property
Output Name What it is