Distortion Parameter details

[natowi]

Description

Clarifying Distortion Parameter order

Related to https://github.com/alicevision/meshroom/issues/1647 https://github.com/alicevision/meshroom/issues/1484

[natowi]

@servantftechnicolor In that case it would be great if you could provide more details

I found this - does the order apply for this node as well?:

1: Pinhole => 3 parameters (focal, principal point x, principal point y) 2: Pinhole radial 1 => 4 params (focal, principal point x, principal point y, one radial distortion factor) 3: Pinhole radial 3 (default) => 6 params (focal, principal point x, principal point y, 3 radial distortion factors) 4: Pinhole brown 2 => 8 params (focal, principal point x, principal point y, 5 distortion factors (3radial+2 tangential)) 5: Pinhole with a simple Fish-eye distortion => 7 params (focal, principal point x, principal point y, 4 distortion factors) https://github.com/openMVG/openMVG/issues/678#issuecomment-260844969 https://openmvg.readthedocs.io/en/latest/openMVG/cameras/cameras/#pinhole-camera-model

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[simogasp]

we need to put this info somewhere. I had started to compile something like this I need to complete it with the 3DE models but then we should put it in the Doxygen of each class and in the main doc

[natowi]

The 3de parameters can be taken fom here: https://github.com/alicevision/AliceVision/blob/develop/src/aliceVision/camera/Pinhole3DE.hpp https://github.com/alicevision/AliceVision/blob/develop/src/aliceVision/camera/Distortion3DE.hpp

I found documentation for the 3de models: https://www.3dequalizer.com/user_daten/tech_docs/pdf/ldpk.pdf https://www.3dequalizer.com/user_daten/tech_docs/pdf/distortion.pdf

This is also a good reference: https://github.com/NatronGitHub/openfx-misc/tree/master/Distortion