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What do rotation and translation vector represent in cameraCalibrate() function

asked 2019-05-13 06:49:48 -0500

Hello everyone,

I need to calibrate 2 cameras in order to do some image processing (stereoscopy). I have been following the "Camera Calibration" tutorial written on openCV for this (https://docs.opencv.org/3.3.0/dc/dbb/...).

I try to understand what the rotation and translation vectors returned by the cameraCalibrate() function represent ?

It is written in the tutorial that "Extrinsic parameters corresponds to rotation and translation vectors which translates a coordinates of a 3D point to a coordinate system". I am not sure to understand this sentence, what coordinate system are they talking about, and what is the considered reference system ?

Thank you

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answered 2019-05-13 13:09:41 -0500

Eduardo gravatar image

Have a look at this figure.

For camera calibration, you need to estimate the rotation and translation that transform a 3D point expressed in the chessboard coordinate system to the camera coordinate system.

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Thank you for your reply. Regarding the chessboard coordinate system, do we know where it is placed on the chessboard ?

kobeking gravatar imagekobeking ( 2019-05-13 13:17:21 -0500 )edit

It is the user that defines the chessboard coordinate system: code.

Have a look here for some images.

Eduardo gravatar imageEduardo ( 2019-05-14 03:16:07 -0500 )edit
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Asked: 2019-05-13 06:49:48 -0500

Seen: 27 times

Last updated: May 13