Hi there, I have a simple dream. Making these work together:

Windows 7 [64bit]
OpenCV 3.0.0 [32bit] builded from source
- features2d
- ffmpeg
Python 3.4.X [32bit]
- tkinter openCV window app
- .. maybe wxWidget
- .. maybe PyQt
Numpy [32bit] (maybe as a start as it does not have a 64bit prebuilt)

This will be a working tutorial. I’m on it.

People from OpenCV have done a new tutorial here which is nice 🙂 [Last updated on Nov 10, 2015.]

Firstly I do some research…

Research

These combination won’t wocrk:

OpenCV 2.4.X and Python 3.0

These combination works:

OpenCV 3.0.0 and Python 2.7.10 – works tested 22-10-2015
OpenCV 3.0.0 and Python 3.4.X – works tested 22-10-2015

Downloads

git client
Cloning of git repositories to get latest sourcefiles safely.
- TortoiseGIT
  - has „explorer context menus“
- SourceTree
  - good log and git tree show
MinGW
g++ compiler for windows
CMake
Manages the build process in an OS and in a compiler-independent manner.
- download setup
  - https://cmake.org/download/
OpenCV
Libraries for Computer Vision
Python
Programming language SDK
pyCharm
Python IDE
- download Community Free setup
  - https://www.jetbrains.com/pycharm/download/

It is important which versions of python modules (numpy etc.) you install. We need 32bit version, not amd64! Also we need a version compatible with our Python 3.4.3

Installation

Based primarily on [1]

Install MinGW
- win32 setup
- I had 0.6.2-beta-20131004-1 into default
  C:\MinGW
- After install run it and check these two:
  - mingw32-base
  - mingw32-gcc-g++
- Then
  - Installation -> Apply Changes … Apply
Install CMake
- install this or the latest
  - cmake-3.4.0-rc1-win32-x86.exe
Python
- install Python 3.4.3 from exe installer (win32 not amd64)
  C:\PROG\dev\Python34\
  - [x] Precompile standard library
  - [x] Add Python 3.4.3 to PATH
- Install modules
  - The Python folders must be in PATH
    - C:\PROG\dev\Python34
    - C:\PROG\dev\Python34\Scripts
  - If installing modules from [.whl] files from here use pip -> later bullet point
  - enviroment variable!
  - numpy = mathematical library
    - numpy-1.8.1-win32-superpack-python3.4.exe
  - matplotlib = graph show etc
    - matplotlib-1.4.3.win32-py3.4.exe
  - scipy = scientific calculations
    - scipy-0.16.0-win32-superpack-python3.4.exe
  - sphinx = python documentation
    - pip install sphinx
- pip install
  - matplotlib – for graph / image plotting as it is used in many Python openCV manuals has dependencies on other modules
  - We can use a pip package manager to download the dependencies and install them
    - in cmd.exe:
```
 $ pip3.4 install matplotlib
```
    - will install dependencies of matplotlib
      - Successfully installed pyparsing-2.0.5 python-dateutil-2.4.2 pytz-2015.7 six-1.10.0
OpenCV
- clone repo into:
  - C:\PROG\dev\openCV\[opencv]
- In folder opencv, create a new folder [build] to build from source within it.
- Run CMake
  - CMake settings
    - To make the buildable items appear in groups
      - check [x] Grouped
    - Suppress development warnings – you are not OpenCV developer
      - Options -> Suppress dev Warnings
  - select opencv
    - c:/PROG/dev/opencv/opencv/
  - select opencv/build
    - c:/PROG/dev/opencv/opencv/build/
  - click Configure
    - if libgmp-10.dll missing
      - add MinGW to your system path
        c:/MinGW/bin
  - set compilator
    - Visual Studio 11 – had some issues so i tried minGW
    - mingw – np – ok – must be in path
  - checkbox what you want to compile
    - as in the pics or in the manual in reference [1]
    - or in screenshots under this list
    - the changes are mainly in groups BUILD and WITH
  - check that the paths in PYTHON3 groups are correct
    - don’t mind the PYTHON3_LIBRARY_DEBUG
  - click Configure again
    - more times and fiddle with checkboxes if needed
      - unselect build OpenCV for Python 2
  - click Generate
  - If there are no warnings
    - do the make and build from selected compiler
      - run make from cmd
        $ mingw32-make.exe
        
        cv2.pyd not found
        uncheck BUILD_opencv_python2
        
        reconfigure and regenerate!
      - make install from cmd afterwards (if no problems)
        $ mingw32-make.exe install
  - If you selected BUILD_DOCS
    - you must build them separately
    - how? IDK!
    - all versions online
    - latest nightly 3.0.x

Screenshots of mingw CMAKE settings – groups WITH and BUILD

+ additional parts

add to CMake configuration
WITH
- [x] 1394
  [..] GIGEAPI – no
  [x] PTHREADS_PF
INSTALL
[x] INSTALL_PYTHON_EXAMPLES
BUILD
[x] DOCS – ?? how to include with sphinx?
[x] EXAMPLES – cxx executable – bin\cpp-tutorial … takes very long (1.5GB)

[] Python 3.5
KB2999226 – error

[] add lib path Preferences
C:\PROG\dev\openCV\opencv\build\lib\Release

build

[] Add PATH variables of bin folders
I also added path to the system „Path“ variable to the „bin“ directories of OpenCV, MinGW and CMake.

Try that it works

The tkinter is a part of Python 3.4 install if you didn’t uncheck it, as well as pip module package manager btw. So to try out if you have installed everything correctly you may try the gr4gallery demo application.

Convert Python 2 to Python 3

If you happen to have some project written in Python 2.X, and you want to convert to Python 3.X, you can use the following regular expression to convert at least the print function semantics:

%s:print \(.*\):print(\1):gc

I run it through gvim one file at a time, as my projects are small. It will just find all the prints in the Python 2 format:

print "something " + str(number)

and enclose it with round brackets as in Python 3:

print("something " + str(number))

Easy but it can work if it is the only thing which you use that changed during conversion from Python 2 to 3.

Another thing is the xrange vs range. xrange is more memory friendly and faster for bigger fields allocated in Python 2.X. In Python 3 there is no such thing as xrange function as the normal range takes its place and possibilities so regex:

%s:xrange:range:gc

Tutorials

Snippets

How to find out of cv2 version installed in Python?

>>> from cv2 import __version__
>>> __version__
'$Rev: 4557 $'
# ... or
'3.0.0-dev'

Another things to install

usefull modules

pywin32
http://sourceforge.net/projects/pywin32/files/pywin32/Build%20219/pywin32-219.win32-py3.4.exe/download

usefull libraries

Panda3D
- game development engine
- as my instructions say

Used references [x]

[1] Installing OpenCV-Python in Windows
[2] opencv mingw win

gr4viton & pow3r

ele / art / 3d / guitar / sci-fi

OpenCV 3.0.0 + Python 3.4 + Win7 + Numpy + Scipy + Mingw