Calibration

Overview

This tab provides:

oTo print the calibration plate

oTo configure image acquisition

oTo calibrate the camera

oTo store the calibration results

Calibration Tab

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Element

Description

Calibration Display

Shows the image received from the camera.

Information Bar

The information bar at the bottom of the Calibration Display provides information on the job name and the operation mode (online / offline).

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Click this button to toggle between online and offline mode.

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Click the Start Calibration button to start the calibration.

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Click the Step Forward button to move one calibration step forward.

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Click the Step Backward button to move one calibration step backwards.

Print Calibration Plate

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Step

Action

1

Click the Start Calibration G-SE-0063612.1.png button.

2

Switch to offline mode. (Click the G-SE-0062880.1.png button to toggle between online and offline mode.

The selected mode is displayed in the information bar at the bottom of the Calibration Display).

3

Click the Print Calibration Plate button.

Result: The dialog to print a calibration grid is displayed.

4

Click the Setup tab and select the following values:

oGrid Type: Checkerboard, with fiducial

oGrid Spacing: 10.000

oGrid Units: Millimeters

5

Click Print Grid button.

6

In the Print dialog, select your printer settings and print the calibration plate.

Configure Image Acquisition

After printing the calibration plate, click the step forward G-SE-0063606.1.png button to go to the Configure Image Acquisition dialog.

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Step

Action

1

For Trigger, select Manual.

(Every time you click the Manual Trigger button, a new image is retrieved from the camera).

2

Place the printed calibration plate in front of the camera.

3

Select the desired aperture value at the camera.

4

Adjust Exposure Time until the white tiles on the checkerboard show a gray value from 200...240.

You have to click the Manual Trigger button to see the effect of changing exposure time.

NOTE: Keep in mind not to overexpose the white tiles. The image saturation G-SE-0062893.1.png button and the Show Bright Areas check box can help you to avoid overexposure.

5

For Trigger, select Continuous Trigger.

6

Switch to online mode.

7

Increase / decrease the focus value at the camera until the maximum Sharpness value is reached.

NOTE: Do not modify aperture value or focus value after calibration is finished.

Calibrate Camera

After configuring image acquisition, click the step forward G-SE-0063606.1.png button to go to the Calibrate Camera dialog.

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Step

Action

1

Switch to offline mode.

NOTE: The Wizard help list provides additional help.

2

Click the Start Calibration Wizard G-SE-0063611.1.png button.

Result: The BandCamera - CalibrateGrid dialog is displayed.

3

Click Setup and select the same values as in the Print Calibration Plate dialog:

oGrid Type: Checkerboard, with fiducial

oGrid Spacing: 10.000

oGrid Units: Millimeters

4

Click Pose.

Result: If calibration points are detected by the camera, the Calibration Display is refreshed and green dots are displayed at the corners of the tiles of the checkerboard.

G-SE-0063607.1.png 

5

Click the Calibrate button.

Result: The calibration algorithm is executed, and the Results dialog provides feedback on calibration quality.

6

If you agree with the results, confirm with OK. Else go back to the Configure Image Acquisition dialog and modify the settings.

Store Calibration Results

After calibrating the camera, click the step forward G-SE-0063606.1.png button to go to the Store Calibration dialog.

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Step

Action

1

The Calibration Files on Camera lists the files already stored on the camera.

2

Enter a name for your calibration file (without extension) to be stored on the camera.

3

Click the Save button.

NOTE: Existing files are overwritten without requesting confirmation.

NOTE: The SchneiderElectric_Calibration.job file is provided with the Camera Module.