ubuntu 16.4 environment is first installed opencv, from the official website to download the source files, cmake to compile and install directly. Program reads image data is not a problem.
但是在imshow时，会出现下面问题：
OpenCV(3.4.1) Error: 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 cvShowImage
Solution Obviously, you need to install libgtk2.0-dev and pkg-config, and then re-cmake.
Opencv header files default installation location of / usr / local / include so first of all you want to delete opencv in the directory / eoencv2 folder
sudo rm -r / usr / local / include / opencv / usr / local / include / opencv2
Next, install the two libraries mentioned above:
the sudo APT-GET libgtk2.0 the install the sudo APT-dev-GET-config the install PKG
below cmake use, not repeated. make make install to complete the installation
finally use the command
pkg-config --modversion opencv
view the version installed opencv
Reference Site https://www.cnblogs.com/emouse/archive/2013/02/22/2922940.html @
https://blog.csdn.net/qiaoji6073/article/details/76572801