Install OpenCv for python in Linux

Open cv is a powerful tool for image processing！

I’ll guided you to install open cv for python in Linux platform.

0. Anaconda

If you installed

Anaconda

in you computer, you may install

opencv

by this command:

conda install opencv

But this may not work, since in Linux, a lot of differences existed.

You may meet this mistakes:

Thefunction is not implemented. Rebuild the library with Windows, GTK+ 2.x orCarbon support. If you are on Ubuntu or Debian, install libgtk2.0‑dev and pkg‑config, then re‑runcmake or configure script

If so, you should use

conda uninstall opencv

and then go to the following steps.

1. Follow the official guidance

https://docs.opencv.org/trunk/d2/de6/tutorial_py_setup_in_ubuntu.html

2. Refer to website

https://jingyan.baidu.com/article/14bd256e466474bb6d2612db.html

3. Mistakes I meet

3.1 ‘NppiGraphcutState’

When I reached 95， I got

‘NppiGraphcutState’ has not been declared

as the follow website

https://devtalk.nvidia.com/default/topic/986950/opencv-installation-problem-nppigraphcutinitalloc-not-declared/

This is caused by the Incompatible between

cuda8.0

and

opencv2

(or

opencv3

).

To solve this:

Modify

opencv-3.0.0/modules/cudalegacy/src/graphcuts.cpp

file.

In detail:

change

#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER)

to

#if !defined (HAVE_CUDA) || defined (CUDA_DISABLER)|| (CUDART_VERSION >= 8000)

Then, re-make. I passed.

3.1 import error

Even I finished make process and I also did

sudo /bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'

sudo ldconfig

But I still can’t

import cv2

in python.

To solve this, I used

cd /home/xx/anaconda2/lib/python2.7/site-packages/
ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so

Thing done!