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Uncertain behavior of hand eye calibration

asked 2021-05-06 09:30:21 -0500

Ranjit Kathiriya gravatar image

Hello there,

I am collecting samples from different pose for move it hand-eye calibration. Instead of solving it shows the far position of my camera after solving sample 5 as shown in the picture. Am I forgetting some steps?

image description

What my robot looks like is described in the below image.

image description

On the six-axis, I have attached an Iron rod and at the end of that rod, there is tool0 (My tool point). In the iron rod, after 10 cm from the axis-six, I have kept the camera at 3.5cm height(Z+ from the rod.).

I don't know the issue, Is something wrong with my configuration or the issue is with the hand-eye calibration?

The hand-eye calibration setting is described below. image description

image description

Thanks for the help!

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1 Answer

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answered 2021-05-27 07:02:35 -0500

Ranjit Kathiriya gravatar image

Thanks, @Piotr for this answer.

We did some hand-eye calibration but we got mixed results. You might want to try to:

  1. Increase the separation between ArUco makers. I think 1 mm is to small of a gap. Our board had a 1cm gap. Also we've noticed that the bigger the markers are the better camera position estimate.
  2. Try different software. We used this package: In it you can also find some tips on what kind of robot movements are the best for the calibration process.
  3. I'm not sure if I understand the package instruction correctly, but I would try to set, depending on what you want to achieve, the "End-effector frame" as the last link of the robot or as your TCP (create a new frame at the end of the rod). Next roughly measure the distance of the camera from that point and put it in as the initial guess.

I hope some of this suggestions will help.

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Asked: 2021-05-06 09:30:21 -0500

Seen: 441 times

Last updated: May 27 '21