Current support of OpenCV for measurement taking

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Hi there,

I've found some documentation and examples on the web to perform measurement tasks using camera calibration techniques and pixel / object size ratio inference from markers.

I wonder if there is a "recommended" workflow for this, and most importantly, if there is any available solution on markerless measurement taking, using the IMU-like systems available on smartphones - such as the ones made available by Google's ARCore or Apple's ARKit.

Thanks.