Working with the command line interface on a server without a monitor

[arno.kn...@gmail.com]

Hello Johannes


I am trying to use COLMAP using the command line interface on a server without a monitor. When I execute ./feature_extractor I get the error: "QXcbConnection: Could not connect to display"
Is there any way to work without having a monitor?

thanks in advance
greetings
Arno


 

[Johannes Schönberger]

Hi,

If you don't have a display attached to the server, then you have to use the CPU feature extractor. Please, checkout the available options with ``./feature_extractor --help``.

Let me know if you have other questions.

Cheers,
Johannes

[arno.kn...@gmail.com]

Thanks for the quick reply. I compiled it with CUDA disabled, so I didn't pay attention to the "--use_gpu" argument anymore, now disabled, it works.

Cheers
Arno

[arno.kn...@gmail.com]

However, when I do "./exhaustive_matcher --no_opengl 1 --General.database_path $PROJECT_PATH/database.db" I get the error:

QObject::connect: Cannot connect (null)::destroyed(QObject*) to QOffscreenSurface::screenDestroyed(QObject*)
F1206 19:03:55.497287 24082 opengl_utils.cc:29] Check failed: 'QCoreApplication::instance()' Must be non NULL

I already set the "--no_opengl" argument but no luck, can you also help me with that?
thanks in advance
Arno

[Johannes Schönberger]

You either need a CUDA GPU or a display for matching. There is currently no CPU matcher, but I plan to add one in the future.

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[Johannes Schönberger]

FYI. The matcher now supports CPU-based matching.