CODEWITHSUNDEEP
opencvimage-processingcamera-calibrationarucopose
pw_machine_vision
pw_machine_vision

Reputation: 95

ArUco markers, why does the pose change when I change image resolution?

I use this reference https://automaticaddison.com/how-to-perform-pose-estimation-using-an-aruco-marker/ to estimate pose of a marker.

When I obtain cam matrix and distortion matrix I used the full camera resolution.

However, when I change the resolution (image size) before pose estimation, I am getting different results. I am not sure why and which resolution would be correct to use.

Should we always use the same resolution as what was used for camera calibration?

I expected the pose to be somewhat independent from image size other than minor changes. Any thoughts?

Upvotes: 1

Views: 591

Answers (1)

Christoph Rackwitz
Christoph Rackwitz

Reputation: 15518

Yes, always use the same resolution.

One could recalculate the camera matrix and distortion coefficients to fit a different resolution but that's a hassle, and requires some knowledge of how the camera made these pictures (binning, cropping). Unless you understand the math behind it, just stick with same resolution.

Upvotes: 2

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