OpenCV problems and solutions

OpenCV problems and solutions:

Using OpenCV 3.2 and OpenCV_contrib 3.2

~/Downloads/opencv_contrib/modules/dnn$ mv pro* .download/bd5e3eed635a8d32e2b99658633815ef/v3.1.0

cmake 

-D CMAKE_BUILD_TYPE=RELEASE 

-D CMAKE_INSTALL_PREFIX=/usr/local 

-D WITH_TBB=ON 

-D WITH_V4L=ON 

-D WITH_QT=ON 

-D WITH_OPENGL=ON 

-D OPENCV_EXTRA_MODULES_PATH=/home/zhangyl/Downloads/opencv_contrib/modules ..

Remove Garbage

~/.local/share/Trash$ sudo rm -r files

http://blog.youkuaiyun.com/wukai0909/article/details/77869399?locationNum=10&fps=1

COPY:

/usr/local/lib/python3.5/site-packages/cv2.cpython-35m-x86_64-linux-gnu.so

TO:

/home/zhangyl/anaconda3/lib/python3.5/site-packages/

PROBLEM:

ImportError: /home/zhangyl/anaconda3/bin/../lib/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/zhangyl/anaconda3/lib/python3.5/site-packages/cv2.cpython-35m-x86_64-linux-gnu.so)

SOLUTION:

conda install libgcc

PROBLEM:

>>> import cv2
RuntimeError: module compiled against API version 0xb but this version of numpy is 0xa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: numpy.core.multiarray failed to import

SOLUTION:

conda remove numpy
conda install numpy

PROBLEM:

cv2.imshow("image", image)
GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will not be saved or shared with other applications.

SOLUTION:

export GIO_EXTRA_MODULES=/usr/lib/x86_64-linux-gnu/gio/modules/