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Camera Calibration

Introduction:

Welcome to the Camera Calibration tutorial. This guide will take you through the essential steps to ensure that your cameras are accurately calibrated and ready to capture spatial data. Let’s dive in.


Step 1: Understanding the Need for Calibration
For the cameras to capture spatial information, they must be calibrated. This process involves determining the lens settings of the cameras and their mutual orientation. Calibration becomes crucial when:

  • There’s a change in the orientation of both cameras relative to each other.
  • A lens setting has been adjusted.
  • There’s been a temperature shift of more than three degrees Celsius since the last calibration.
  • The cameras have been subjected to mechanical influences, such as vibrations.

Step 2: Adjusting the Lens Settings Before initiating the calibration, adjust the lens settings based on your future operational distance. For first-time users, a distance of only 20 cm is recommended. To adjust:

  • Slightly loosen the lens screw.
  • Gently turn to refine the focus.

Step 3: Initiating the Calibration Process Navigate to the calibration settings:

  • Select the deployed calibration plate under ‘Settings’.
  • Press ‘activate’.

Step 4: Capturing Calibration Images Position the calibration field centrally in front of one camera:

  • Capture an image using the ‘Add’ button on the screen or in the CeController App.
  • Rotate the calibration field by 90 degrees.
  • Capture three more images.
  • Repeat this process for the other camera.

Step 5: Determining Camera Alignment To determine the mutual alignment of both cameras:

  • Move the calibration field from one edge to the other.
  • Tilt the calibration field by 20 degrees in four directions.
  • Rotate the calibration field by 90 degrees and repeat the entire process.

Step 6: Ensuring Steady Calibration For accurate calibration:

  • Ensure the calibration field is held steady during capture.
  • It’s recommended to support the calibration field on a table rather than holding it in the air.

Step 7: Adjusting for Larger Working Volumes If calibrating for a larger working volume:

  • Adjust the tripod’s vertical angle using the front star screw.
  • This allows for more runs in missing image areas.

Step 8: Calculating Calibration In the sidebar:

  • View the captured images.
  • Press ‘Calculate’ to compute the calibration.
  • Aim for an error value below 0.33 pixels, below 0.25 is excellent.
  • Images with high pixel errors can be replaced for better calibration quality.

Step 9: Finalizing Calibration Remember:

  • A low error value alone doesn’t indicate good calibration.
  • Ensure a well-distributed capture of image points, especially towards the image corners.
  • Once satisfied, press ‘overwrite’ to finalize the calibration.

Conclusion:

Your cameras are now calibrated and ready to capture spatial data with precision.

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