Hardware manual

Impact Reference Guide Camera
2-29 Datalogic Automation Inc.
4. Move the target that the center of the image you use corresponds to the center of the lens (optical axis)
as much as possible. (The yellow crosshairs indicate the center of the FOV.) When the target is placed
correctly, focus the camera so that the target dots are clear and sharp.
5. Click the Snap button.
6. Type the dot pitch measurement into the Target Pitch (units) field. The dot pitch is the distance from
the center of one dot to the center of an adjoining dot. This measurement is indicated on the last two
digits of the target part number. (In this sample image, the dot pitch is 16.0 units.)
7. Select the Target Dot Pattern type, hexagon or grid.
8. Click the Calibrate button. The Scale Factor (in Units per Pixel) is displayed when the calibration is
complete. Scale Factor is the number of pixels in the image window per "real-world" unit on the target.
This value is used to automatically calibrate measurements in VPM tools with the physical dimensions
of the image.
Target Settings
• Target Pitch (units)
This is the distance between dots on the calibration target. It is independent of the units (e.g. millime-
ters, inches, centimeters). The sample target image on page 2-10 has a 2.0 target pitch.
• Target Dot Pattern
You can use a target that is laid out in a hexagonal or a grid pattern. The two small sample images
show the difference.
Calibrate Manually
Use this option when you know the unit to pixel conversion value for the image. Units per Pixel is the num-
ber of pixels in the image window per "real-world" units on the image.
To Calibrate manually
1. Select Manually from the Calibrate drop-down.
Sample Calibration
Image