Opencv gui issue

[annaborn]

The call cv2.namedWindow causes an issue:

QObject::moveToThread: Current thread (0xca9110) is not the object's thread (0x1256140).
Cannot move to target thread (0xca9110)

The problem comes with the installation of opencv-python, that is required by paz and defined in setup.py. Current solution is to uninstall opencv-python, build and install the latest version of opencv manually.

The same problem was described in opencv-python github

[annaborn]

Here is small shell script to download and install the latest version of opencv (4.2.0)

mkdir opencv
cd opencv

wget https://github.com/opencv/opencv/archive/4.2.0.zip
unzip 4.2.0.zip

cd opencv-4.2.0
mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make -j8
sudo make install

cd ../../../
rm -rf opencv/

[oarriaga]

Hi Anna,
thank you for script. It would be helpful for anybody having this issue.
As of now I would like to leave the requirements as they are since I don't know for sure how many people are affected by this bug, and I feel it's better to have most people having "easy installation" with pip than all of the people having to build openCV.

[oarriaga]

I will close this for now since the problem is out of the hands of PAZ.