QCapture PRO 7 User Manual - QImaging

The Capture Tab
3. Draw a line over a feature in the image.
You will see the Calibrate by Feature dialog:
4. Select a calibration name in the drop-down list.
5. Select the units in the drop-down list, and indicate the number of units in the
selected feature.
6. Indicate if this is a system or reference calibration.
7. Click OK.
Calibrating by Aspect Ratio
If your calibration must also correct for aspect ratio, you must either know the value
l/h (length divided by height) for a perfect square as represented in the image, or there
must be a feature pictured in the image that is known to be a perfect square (see
“Aspect Ratio” under “About Spatial Calibrations” above).
To create a spatial calibration:
1. Open the image you want to calibrate or that you want to use to create the
calibration definition.
3-15