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alicevision / meshroom-manual

Meshroom manual and documentation
https://meshroom-manual.readthedocs.io
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Description of terms within file format #12

Open skinkie opened 4 years ago

skinkie commented 4 years ago

As developer/user I am currently reviewing the .sfm fileformat. I want to know what for example an intrinsicId is. OpenMVG is obviously a good place to start https://readthedocs.org/projects/openmvg/

natowi commented 4 years ago

Yes, I have some notes on the sfm format.

intrinsicId is used for images that share the same camera intrinsics.

Related and needs to be added to the docs, too: https://github.com/alicevision/meshroom/issues/683

and

https://gist.github.com/natowi/ad9ce6d9f912e089bba9b69ec91d7115

skinkie commented 4 years ago

I was very surprised to see 2 intriniscs from the same smartphone camera. But I think this is the difference between focus macro vs infinity.

natowi commented 4 years ago

Yes. We can not use the same camera intrinsics for a different focus

simogasp commented 4 years ago

More generally, the sfm file is a mapping of the SfmData structure into a json format, normally the same name for the fields is preserved https://github.com/alicevision/AliceVision/blob/develop/src/aliceVision/sfmData/SfMData.hpp https://github.com/alicevision/AliceVision/blob/develop/src/aliceVision/sfmData/View.hpp