Camera Calibration

1. Open the Calibration Tool:

Navigate to the Sensor Ribbon -> Utilities -> Camera Calibration tool . This option may be collapsed under a dropdown menu.

Figure 1: Camera Calibration tool in the Utilities group of the Sensor tab of the ribbon

2. Read the Instructions:

Carefully read the instructions provided in the Camera Calibration dialog (Figure 2).

3. Pick Calibration Pairs:

• Use Profile View with colorization set to Intensity to find calibration targets.
• Ideal targets include objects with a defined 90-degree angle and a contrasting background, such as windowsills, parking lot paint markings, and business signs.
• If necessary, deploy your own calibration targets.

4. Select New Pair:

• Click Pick New Pair.
• In your profile, find a target and select it. An Image Explorer window will pop up showing candidate photos near the point.
• Hover over the photos to see the camera identifier (e.g., yymmdd_hhmmss_X_123.jpeg, where X indicates the camera number).
• Select a clear image and left-click to assign the photo.

5. Validate Picked Pair:

• Once satisfied with your selection, go back to the Camera Calibration window and select Validate the Picked Pair.
• Repeat this process around five times, ensuring a variety of angles from the vehicle's point of view.

6. Calibrate:

• • • After selecting and validating pairs, click the Calibrate button at the bottom.
    • The XYZ deltas will be calculated. Aim for values better than 20cm of accuracy.
    • Delete any pairs that do not meet this threshold and try different targets.

7. Improve Results:

• Continue deleting and adding new pairs to improve results.
• Once you have 15-30 good pairs with acceptable deltas, select Validate to commit the rotation angles to your calibration file and update the photo position EXIF tags.

8. Run Colorize Tool:

• Run the Colorize tool on the Sensor Ribbon.

9. Inspect Results:

• Inspect the results of colorization to ensure they meet your accuracy standards.
• If necessary, redo the process to achieve better results.
• Provide feedback to your survey crew on the types of targets and coverage that yielded the best results.