# How do I verify the rotation matrix I receive after camera calibration?

**URL:** <https://forum.opencv.org/t/how-do-i-verify-the-rotation-matrix-i-receive-after-camera-calibration/3875>\
**Category:** Uncategorized\
**Tags:** calib3d\
**Created:** [June 16, 2021, 8:31am UTC](https://forum.opencv.org/t/how-do-i-verify-the-rotation-matrix-i-receive-after-camera-calibration/3875 "2021-06-16T08:31:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ha\_rez](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/ha_rez/32/1733_2.png) [@Ha\_rez](https://forum.opencv.org/u/Ha_rez)\
**Post date:** [June 16, 2021, 8:31am UTC](https://forum.opencv.org/t/how-do-i-verify-the-rotation-matrix-i-receive-after-camera-calibration/3875/1 "2021-06-16T08:31:28Z")

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Hi guys,

I am currently working on the intrinsic and extrinsic calibration of cameras using OpenCV. I use cv. solvePNP() to get the rotation and translation of a camera. I can verify the translation with a tape measure. However, it is difficult for me to verify the rotation, because I think a triangle ruler gives too large measurement errors. Is there a better method to verify the rotation matrix?