Hardware manual

Impact Reference Guide Line Gauge
3-125 Datalogic Automation Inc.
Step Angle
NOTE: For purposes of conversion, one radian is equal to 180 divided by pi (approximately 57.296
degrees). One degree is equal to pi divided by 180 (approximately 0.01745 radians).
When you enter a value for Number of Steps, the tool will repeat the same measurement "Number of Steps"
times. Step Angle is the reference angle for the step segments in relation to the primary Wide Line ROI, in
degrees.
Subpixel Method
Subpixel method “None” means that edges are located to pixel resolution. However, if the tool calculates
Euclidean distances and the endpoints are not on the same row or column, then edges are located to fractions
of pixels. This is a natural result of the ROI taking a slanted path across the pixel grid, even when it starts
and ends on pixel boundaries. Integral distances are displayed if Subpixel Method is "None" AND the Dis-
tance Type is AbsoluteX or AbsoluteY (or the endpoints are on the same row or column) AND the image is
not calibrated.
Subpixel Search Distance
This value specifies the maximum distance, in pixels, that the subpixel algorithm will search for the subpixel
edge from the edge based on the threshold. In some cases the edge transition from dark to light takes several
pixels. This means the subpixel edge could be located several pixels from the non-subpixel (threshold) edge,
because the subpixel algorithm is looking for the point of maximum grey level change (slope).
This setting can help prevent the edge location from "jumping" between subpixel positions. For example, if
this search distance is set to one (1), the subpixel edge found by the algorithm will never be located more
than one (1) pixel from the edge based on the threshold.
Scale Factor
The measurement tool can be calibrated so that the distance measured in pixels on the image relates cor-
rectly to the measurement’s real-world units. You can calibrate the tool alone or in addition to the camera.
For example, you can calibrate the measurement tool on a sample part as well as calibrate the camera for all
parts. If you have multiple measurements and are concerned with lens distortion or multiple image planes,
you can calibrate each measurement tool separately.
To train the tool’s scale factor:
1. Place the Wide Line ROI across the distance to be measured and adjust the Threshold and Sensitivity
settings.
2. Press the Train button. Check the endpoints found to make sure the desired distance is being measured.
3. Type the known measurement distance into the Scale Factor Train Distance field.
4. Click the Train button.
You can also average several images of measurements to create a more accurate scale factor.
To average several images:
1. Train the tool’s scale factor.
Step Segment List A list of the step line segments (when Number of Steps is greater than 1)
Number of Edges
Per ROI List
The number of edges found on each ROI.
Output Name What it is