how to make pre-installed in jetson nano opencv-python visible for pip3?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

Hello!

I know that opencv-python is pre-installed in jetson nano’s jetpack. But when I try “pip3 install keras-retinanet” (keras-retinanet requires opencv-python) it gives me “Error: No matching distribution found for opencv-python”. So I just can’t install keras-retinanet (and any other packages that require opencv-python) via pip.

After reading related discussions I know that pip3 can’t see opencv-python because it wasn’t installed via pip3. And I can’t install opencv-python via pip3 because there is no prebuild version for the platform.
So it feels like in order to be able to install some package that requires opencv-python via pip3 (keras-retinanet in my case) I have to make pip3 to see the pre-installed opencv. But how can I do that?

I even tried to reinstall/rebuild opencv-python from the source (as described here Installing OpenCV 3.4.6 on Jetson Nano) - but it doesn’t solve the issue - still opencv-python is not visible for pip3.

Can anyone help, please?
Thanks in advance!

1 Like
2

Hi,

You can try to build openCV from source with python3 support.
We have an automatically script for this:
https://github.com/AastaNV/JEP/blob/master/script/install_opencv4.1.1_Jetson.sh

THanks.

3

Thank you for the reply, but I’ve tried to rebuild opencv and it doesn’t make it “visible” for pip3. So the issue remains.

The only workaround that I found is to use --no-dependencies key:

pip3 install <some_opencv_dependent_package> --no-dependencies

(found here python - pip: force install ignoring dependencies - Stack Overflow)

It will allow you install <some_opencv_dependent_package> even though pip3 can’t “see” opencv-python. pip3 will annoy you with warnings though since after

1 Like
4

Hi,

Thanks for the sharing.