[OpenCV] How to install appropriate OpenCV version?

[Goal] 사용자가 원하는 OpenCV library Version을 local에 설치하고 기존에 있는 OpenCV library를 제거

To check current version of opencv on desktop

$ pkg-config --modversion opencv

# example above sentence
3.2.0

Remove current version of opencv on desktop

$ sudo apt purge libopencv* python-opencv

# To remove it more neatly, look for the following as:
$ cd /
$ sudo find -name "*opencv*"

**# It directly searches for the files corresponding to the results of the above sentence and deletes them**
# One example of aformentioned sentence
$ cd /usr/local/lib
$ sudo rm -r libopencv_*

# Then checking there is no package on own desktop
$ pkg-config --modversion opencv

# example above sentence 
No package 'opencv' found

To install opencv version 3.4.0 [There are two ways: (1) OpenCV Only (2) OpenCV with CUDA]

Reference Site: https://www.pytorials.com/how-to-install-opencv340-on-ubuntu1604/

How to install OpenCV 3.4.0 on Ubuntu 16.04 | pytorials.com

Following as:

# To install Opencv Only
$ pip install opencv-python

# Install Dependencies
$ sudo apt-get install build-essential
$ sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

# To Download OpenCV 3.4.0 & OpenCV Contrib 3.4.0 
# (Contrib has very useful algorithms which is a must for anyone working on Computer Vision)
$ wget [<https://github.com/opencv/opencv/archive/3.4.0.zip>](<https://github.com/opencv/opencv/archive/3.4.0.zip>) -O opencv-3.4.0.zip
$ wget <https://github.com/opencv/opencv_contrib/archive/3.4.0.zip> -O opencv_contrib-3.4.0.zip

# Extrack OpenCV
$ unzip opencv-3.4.0.zip
$ unzip opencv_contrib-3.4.0.zip

# Make a directory named build inside OpenCV-3.4.0
$ cd opencv-3.4.0
$ mkdir build
$ cd build

# Configuration cmake
# First method **install only opencv**
$ cmake -D CMAKE_BUILD_TYPE=RELEASE \\
        -D CMAKE_INSTALL_PREFIX=/usr/local \\
        -D OPENCV_GENERATE_PKGCONFIG=YES \\
        -D WITH_CUDA=OFF \\
        -D WITH_CUDNN=OFF \\
        -D OPENCV_DNN_CUDA=OFF \\
        -D WITH_FFMPEG=OFF \\
        -D WITH_CUFFT=ON \\
        -D ENABLE_FAST_MATH=ON \\
        -D CUDA_FAST_MATH=ON \\
        -D WITH_CUBLAS=ON \\
        -D WITH_LIBV4L=ON \\
        -D WITH_GSTREAMER=ON \\
        -D WITH_GSTREAMER_0_10=OFF \\
        -D WITH_QT=OFF \\
        -D WITH_OPENGL=ON \\
        -D BUILD_opencv_cudacodec=OFF \\
        -D CUDA_NVCC_FLAGS="--expt-relaxed-constexpr" \\
        -D WITH_TBB=ON \\
				-D ENABLE_PRECOMPILED_HEADERS=OFF \\
        -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.4.0/modules \\
        ../

# If you want to **connect with CUDA** then following this github:
# ***** **<https://github.com/engcang/vins-application#-cv_bridge-with-opencv-3x-version**> *****
$ cmake -D CMAKE_BUILD_TYPE=RELEASE \\
        -D CMAKE_C_COMPILER=gcc-6 \\ # IF there has some error then install gcc-6 g++-6 !!
        -D CMAKE_CXX_COMPILER=g++-6 \\
        -D CMAKE_INSTALL_PREFIX=/usr/local \\
        -D OPENCV_GENERATE_PKGCONFIG=YES \\
        -D WITH_CUDA=ON \\
        -D WITH_CUDNN=ON \\
        -D OPENCV_DNN_CUDA=ON \\
        -D WITH_CUFFT=ON \\
        -D WITH_FFMPEG=ON \\
        -D CUDA_ARCH_BIN=8.6 \\ # Please check Compute capability
        -D CUDA_ARCH_PTX="" \\
        -D ENABLE_FAST_MATH=ON \\
        -D CUDA_FAST_MATH=ON \\
        -D WITH_CUBLAS=ON \\
        -D WITH_LIBV4L=ON \\
        -D WITH_GSTREAMER=ON \\
        -D WITH_GSTREAMER_0_10=OFF \\
        -D WITH_QT=ON \\
        -D WITH_OPENGL=ON \\
        -D BUILD_opencv_cudacodec=OFF \\
        -D CUDA_NVCC_FLAGS="--expt-relaxed-constexpr" \\
        -D WITH_TBB=ON \\
        ../

# Build
$ make -j4

# Install in the location /usr/local using command
$ sudo make install

Now, check changed opencv version

$ pkg-config --modversion opencv

# example above sentence
3.4.0

********* **[Error List] *******
- [1] [TypeError]: 'NoneType' object is not iterable opencv & [ERROR]: Command errored out with exit status 1: ~/.venvs/venv/bin/python ~/.venvs/venv/lib/python2.7/site-packages/pip/_vendor/pep517/ _in_process.py get_requires_for_build_wheel /tmp/tmp7q7z4L Check the logs for full command output.
  - A) Change version of pip & opencv-python
    - Reference Site: https://stackoverflow.com/questions/63448467/installing-opencv-fails-because-it-cannot-find-skbuild
      
      Installing OpenCV fails because it cannot find "skbuild"
    - Reference Site (Kor): https://remoted.tistory.com/418
      
      Python 2.7 installing opencv via pip (virtual environment)
    - Following As:
```
# To upgrade pip
$ python -m pip install --upgrade pip

# To install downgrade opencv-python version
$ python -m pip install opencv-python==4.2.0.32
```
- [2] [CMake Error]: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files: CUDA_nppi_LIBRARY (ADVANCED)
  - A) Change FindCUDA.cmake & OpenCVDetectCUDA.cmake in opencv-3.4.0/cmake
    - Reference Site: https://stackoverflow.com/questions/46584000/cmake-error-variables-are-set-to-notfound
      
      CMake Error: Variables are set to NOTFOUND
    - Change Code from following as: https://github.com/opencv/opencv/tree/master/cmake
      
      opencv/cmake at master · opencv/opencv
- [3] [fatal error]: stdlib.h: No such file or directory #include_next <stdlib.h>
  - A) Add one line when cmake in build folder or modified CMakeList.txt in opencv folder
    - Reference Site: https://stackoverflow.com/questions/40262928/error-compiling-opencv-fatal-error-stdlib-h-no-such-file-or-directory
      
      Error compiling OpenCV, fatal error: stdlib.h: No such file or directory
    - Following as:
```
# Add following line:
-D ENABLE_PRECOMPILED_HEADERS=OFF

# Or modified CMakeList.txt file
OCV_OPTION(ENABLE_PRECOMPILED_HEADERS "Use precompiled headers"                                  
**OFF** IF (NOT IOS AND NOT CMAKE_CROSSCOMPILING) )
```
- [4] [Linking error]: undefined reference TIFFReadDirectory@LIBTIFF_4.0 & TIFFWriteEncodedStrip@LIBTIFF_4.0 & TIFFIsTiled@LIBTIFF_4.0 & TIFFOpen@LIBTIFF_4.0 & TIFFReadEncodedStrip@LIBTIFF_4.0 & TIFFSetField@LIBTIFF_4.0 & TIFFWriteScanline@LIBTIFF_4.0 & TIFFGetField@LIBTIFF_4.0 & TIFFScanlineSize@LIBTIFF_4.0 & TIFFNumberOfStrips@LIBTIFF_4.0 & TIFFSetWarningHandler@LIBTIFF_4.0 & TIFFSetErrorHandler@LIBTIFF_4.0 & TIFFReadEncodedTile@LIBTIFF_4.0 & TIFFReadRGBATile@LIBTIFF_4.0 & TIFFClose@LIBTIFF_4.0 & TIFFRGBAImageOK@LIBTIFF_4.0 & TIFFReadRGBAStrip@LIBTIFF_4.0
  - A) Modified CMakeList.txt in opencv folder or In conda environment then uninstall tiff library (conflict with anaconda lib and local lib)
    - Reference Site: https://github.com/BVLC/caffe/issues/4436
      
      Error in installing Caffe with OpenCV 3.1.0 on Ubuntu 16.04 · Issue #4436 · BVLC/caffe
    - Following as:
```
# Modified CMakeList.txt in opencv folder
OCV_OPTION(WITH_TIFF           "Include TIFF support"                        
**OFF**   IF (NOT IOS) )
```
    - [Recommend] Reference Site: https://github.com/colmap/colmap/issues/188
      
      Undefined reference to libtiff4.0 on compile (Ubuntu 16.04) · Issue #188 · colmap/colmap
    - Following as:
```
# First Check libtiff existed in /usr/lib/x86_64-linux-gnu
$ sudo ldconfig -p | grep libtiff

# In terminal with anaconda environment
(base) $ conda uninstall libtiff
```
- [5] [Linking error]: libSM.so.6: undefined reference to uuid_generate@UUID_1.0', uuid_unparse_lower@UUID_1.0'
  - A) Conflict with Anaconda library and local library. So remove libuuid.* in anaconda library
    - Reference Site: https://stackoverflow.com/questions/45584275/getting-error-usr-lib-lib64-libsm-so-undefined-reference-to-uuid-unparse-l
      
      Getting error /usr/lib/../lib64/libSM.so: undefined reference to `uuid_unparse_lower@UUID_1.0' when trying to complie newest version of vim
    - Following as:
```
# First Check libuuif existed in /usr/lib/x86_64-linux-gnu
$ sudo ldconfig -p | grep libuuif

# Go to Anaconda library and remove uuid library
$ cd anaconda3/lib
$ sudo rm -r libuuid.* 
```
    - Then re-build opencv
- [6] [Make error]: Makefile:162: recipe for target 'all' failed
  - A) Do not limited core when make opencv build.
    - Reference Site: https://github.com/kakao/khaiii/issues/23#issuecomment-445687382
      
      Makefile:162: recipe for target 'all' failed · Issue #23 · kakao/khaiii
    - Following as:
```
# Not "make -j4" but only "make" 
$ make
```
- [7] [Cmake error]: CMake Error at cmake/OpenCVCompilerOptions.cmake:21 (else): Flow control statements are not properly nested.
  - A) Comment 21 ~ 22 line in OpenCVCompilerOptions.cmake
    - Reference Site: https://gist.github.com/LorenzoLamberti94/2f35d844121a63558c425618ea12ceef#file-opencv3-2withcontrib-sh-L76
      
      OpenCV 3.2 with Contrib install script
    - Following as:
```
$ cd opencv-3.2.0/cmake
$ sed -i '21,22 s/^/#/' ./OpenCVCompilerOptions.cmake
```
- [8] [fatal error]: LAPACKE_H_PATH-NOTFOUND/lapacke.h: No such file or directory #include "LAPACKE_H_PATH-NOTFOUND/lapacke.h"
  - A) OpenCV cannot find lapacke package → change installed path
    - Reference Site: https://github.com/YuvalNirkin/face_swap/issues/51
      
      OpenCV installation error · Issue #51 · YuvalNirkin/face_swap
    - Following as:
```
# Install lapacke library
$ sudo apt-get install liblapacke-dev checkinstall

# Go to build folder
$ cd opencv-3.2.0/build

# Change line 2 
# [Before] #include "LAPACKE_H_PATH-NOTFOUND/lapacke.h"
# [After] #include "/usr/include/lapacke.h"

$ make
```