Comments (4)
ArosPrince
commented on July 25, 2024
Hi, can you please elaborate a bit on the proposed fix? It's not clear to me at all, what should I do in such a case. Is this before running the script or after?
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mdegans
commented on July 25, 2024
Hi, can you please elaborate a bit on the proposed fix? It's not clear to me at all, what should I do in such a case. Is this before running the script or after?
So, in order to directly imshow a GpuMat without downloading it to a Mat, you need to build OpenCV with OpenGL support or you get this error:
... Library was built without OpenGL support ...
Generally this means tracking down some blablabla-dev package in Canonical's apt repositories and making sure it's installed before build.
To answer your question, you could either install such a package before running the script or add it somewhere in this list here:
nano_build_opencv/build_opencv.sh
Line 64 in 0832a85
it's likely these packages:
https://askubuntu.com/questions/306703/compile-opengl-program-missing-gl-gl-h#comment1952106_866868
So just adding mesa-common-dev, libglu1-mesa-dev, freeglut3-dev, libglfw3-dev and libgles2-mesa-dev will probably fix it. I don't know exactly which if those OpenCV actually requires. Possibly just the first. Possibly all of them. You can test and see. I haven't had time to recently or to look into exactly what cmake is expecting.
If it works, you should see:
-- OpenGL support: YES
If you do, and get a GpuMat displaying directly in imshow feel free to submit a PR closing this issue out.
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ArosPrince
commented on July 25, 2024
OK, will try that and submit a PR if that works.
One more question though... Can I just rerun the script after installing the packages, do I somehow have to uninstall it first (I have already built opencv).
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mdegans
commented on July 25, 2024
You should be able to just re-run the script.
…On Tue, Oct 19, 2021, 3:59 AM ArosPrince ***@***.***> wrote:
OK, will try that and submit a PR if that works.
One more question though... Can I just rerun the script after installing
the packages, do I somehow have to uninstall it first (I have already built
opencv).
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