How to use opencv-python on WSL2 Ubuntu20.04

cmpltrtok

4/5/23, 9:21 AM

I have just installed a Ubuntu-20.04 on WSL2. And I installed a miniconda env with python 3.7, and then I installed opencv-python by "conda install opencv". But when I try the simplest cv2.imshow, it complains below:

cv2.error: OpenCV(3.4.2) /tmp/build/80754af9/opencv-suite_1535558553474/work/modules/highgui/src/window.cpp:632: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

By the way, I can show plotting window by matplotlib.pyplot after I installed a VcXsrv and export DISPLAY=host_ip_in_wsl2:1.1. And I also make my GPU works after installed Windows 10 November 2021 update, CUDA driver for WSL2, and CUDA toolkit 11.0. I can get Tensorflow 2.4.1 working well with GPU. I can compile darknet with GPU and use it for YOLO v1.

I googled some. They say uninstall opencv and reinstall from channel menpo can do it. But this post is 5 years ago and not for WSL.

I also saw some posts demonstrate a tedious procedure to compile opencv-python from source.

So, how to use opencv-python on Ubuntu-20.04 of WSL2? Easy approaches like "conda install ..." or "pip install ..." is preferred. Compiling from source is also acceptable.

325

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python

opencv

windows-subsystem-for-linux

Nmath

4/5/23, 9:34 AM

If errors are asking for GTK, you might not be able to use this software on WSL since WSL currently does not officially support a desktop environment. GTK is associated with desktop environment functionality. If you want a fully fledged Ubuntu experience on Windows, you can install Ubuntu in a VM like VirtualBox.

cmpltrtok

4/5/23, 10:11 AM

@Nmath, but the WSL2 approach is the only way I know to use GPU other than the unacceptable dual-boot when Windows and GPU be both musts. Any hopes?

Nmath

4/5/23, 8:13 PM

Dual boot configuration is probably your only option.

Score:0

Ubuntu

cmpltrtok

5/1/23, 11:09 AM

I solved this problem by install opencv-python by pip.

$ pip install opencv-python

But I don't understand why pip works when conda install opencv does not. If anybody knows the detail, could you give me some clue?

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Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: How to use opencv-python on WSL2 Ubuntu20.04

TH: วิธีใช้ opencv-python บน WSL2 Ubuntu20.04

RO: Cum să utilizați opencv-python pe WSL2 Ubuntu20.04

RU: Как использовать opencv-python на WSL2 Ubuntu20.04

VI: Cách sử dụng opencv-python trên WSL2 Ubuntu20.04

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