Hardware manual

Camera Impact Reference Guide
Datalogic Automation Inc. 2-28
The type of camera currently acquiring images.
Frames per Second
This field indicates the number of frames the device can capture and process per second. It is calculated
based on the current Shutter Open Time, Partial Scan line and Half Resolution Mode settings.
Calibrate
Click this button to calibrate the camera when the desired image is displayed in the image window. You can
use the Snap button or Load Image button to display the image.
Load Image
Click this button to load a file image into the image display window. You can calibrate the camera using this
image and the image is displayed in the task image window.
Set To Defaults
Click this button to restore all camera settings to their factory defaults.
Calibrate From Target
Use this option when you have a calibration target with a hexagonal or grid dot pattern and a known dot
pitch. This procedure assumes you are using a standard Datalogic calibration target and a live camera.
The calibration algorithm works best when the target’s dot pattern fills the camera’s field of view (FOV).
Any areas outside of the dot target are extrapolated. Lens distortion is a radial phenomenon (a function of the
distance from the center of the lens), so the extrapolation will not be as accurate as the calibration. It is best
practice to have the dot target cover all parts of the FOV where any inspection measurements will be made.
Larger dots provide a more accurate calibration because the dot centers can be more accurately located. The
dots must be a minimum of twenty pixels in diameter spaced twenty pixels apart. The minimum blob size is
nine pixels.
It is not critical to center the calibration target in the FOV. It is important, however, that the center of the
image you use corresponds to the center of the lens (optical axis). The calibration algorithm assumes that the
center of the calibration image is the center of the lens. It accounts for partial scanning of the run-time
image, and cropped and sampled images from the Image Sampling tool. It does not account for the case
where the calibration image is offset from the optical axis due to partial scanning.
It is important for accurate measurement during inspection that the inspected part does not move outside the
area covered by the dot target during calibration.
To Calibrate from a target
1. Select From Target from the Calibrate drop-down.
2. Be sure that the camera is mounted securely. Place a standard Datalogic calibration target (Part # 381-
0985-xx) in front of the camera. (The final digits of the part number indicate the target’s dot pitch in
millimeters.) The dot pitch is the center-to-center measurement between dots. The dots must be a min-
imum of twenty pixels in diameter spaced twenty pixels apart.
3. Click the Live button. Be sure that the target is well lit but not saturated. Place the target in the cam-
era’s field of view (FOV) where the inspected part will appear. Calibration is more accurate if the tar-
get’s dot pattern fills the FOV.