Topics

1

General / Camera and Point Cloud Export into the same coordinate system

« on: September 15, 2021, 10:55:51 AM »

Hey hey,

I am currently trying to use Metashape 1.7.3 for a research project. For that I need the camera poses (R | t) and the dense cloud in the same coordinate system. I export the cameras into the agisoft XML and the dense cloud into PLY. After scanning all relevant threads here in the forum I understand that each pose T_cam = (R | t) must be multiplied with the chunk transformation T_chunk like T = T_cam * T_chunk to get my real pose in the same coordinate system as my dense cloud . However, something about that is still fishy, because they don't nearly agree with the Omega Kappa Phi export.

Then I thought, okay use the Omega Kappa Phi export. But these camera poses also don't seem to be located in the same coordinate system as the dense cloud. I am really confused by what camera pose I actually get from which export and how to achieve what I want. My subsequent algorithms all work fine with colmap and other tools, but metashape poses + pointcloud just don't seem to align. What do I do wrong?

Best regards,

Alex

2

General / Camera Export: Transformation and Reference

« on: March 08, 2018, 09:01:51 PM »

Hey there people,

I am currently trying to compare trajectories using photoscan and visual SLAM data. I have both geo referenced, therefore in global coordinate system (UTM). I wonder what the relation between the translation vector of the 4x4 matrix and the reference with x,y,z is (using the camera export function -> Agisoft XML)? What do I do to get the exact camera position generated by photoscan?

Thanks for your response and best regards,

Alex