Installing OpenCV on Windows 7 for Python 2.7

当我第一次为了做一个项目而接触Opencv的时候，我按照网上的方法安装了opencv2.2或者opecv2.3但是结果总是出问题。比如：ImportError: No module named opencv

后来终于明白问题出在哪个地方了，现在我把我的经历分析给大家。希望对刚接触Opencv的有所帮助

对于Python2.5的安装我上面一片文章有所介绍。经测试没有问题，然而，我需要在Python2.7上面运行。

As of OpenCV 2.2.0, the package name for the Python bindings is "cv".The old bindings named "opencv" are not maintained any longer. You might have to adjust your code. Seehttp://opencv.willowgarage.com/wiki/PythonInterface.

The official OpenCV installer does not install the Python bindings into your Python directory. There should be a Python2.7 directory inside your OpenCV 2.2.0 installation directory. Copy the whole Lib folder from OpenCV\Python2.7\ to C:\Python27\ and make sure your OpenCV\bin directory is in the Windows DLL search path.

Alternatively use the opencv-python installers at http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv.

Setup OpenCV for Python in Windows

I have always struggled when trying to set up OpenCV for Python before. So I decide to write this post to help myself in the future and share with you =). My setup is for OpenCV 2.2 but I think you can apply for any version of OpenCV.

Step 1: Download and install Python 2.7 from http://www.python.org/getit/releases/2.7.2/. You need to install the 32bit version of Python. OpenCV currently does not work with Python 64bit.

Step 2: Download and install OpenCV 2.2 from http://sourceforge.net/projects/opencvlibrary/files/. Note that this version only supports Python 2.7 (not 3.x).

Step 3: Download and install NumPy 1.6.1 and SciPy 0.9.0 from: (you need to choose the files which support Python 2.7)

http://sourceforge.net/projects/numpy/files/NumPy/1.6.1/
http://sourceforge.net/projects/scipy/files/scipy/0.9.0/

Step 4:Setup Windows Path in Environment Variables

Add “C:/Python2.7;C:/OpenCV2.2/bin” to PATH variable (You need to change the directory to where you install Python and OpenCV).
Create PYTHONPATH variable and put “C:/OpenCV2.2/Python2.7/Lib/site-packages” as value.

Update: For OpenCV2.3, There are two other options for this step:

As Kyle commented below, you can copy the content of folder “C:\opencv\build\python\2.7” (for opencv 2.2: C:/OpenCV2.2/Python2.7/Lib/site-packages) to folder “C:\Python27\Lib\site-packages“
OR, add these two lines at the beginning of your program:

1 import sys

2 sys.path.append("C:\OpenCV2.2\Python2.7\Lib\site-packages")

Yosh!!! You have finished setup OpenCV for Python in Windows. Open Python IDLE, create a new file, add the program below and run it:

 
          1 
          importcv 
        
          2 
            
          3 
          cv.NamedWindow("camera",1) 
        
          4 
          capture=cv.CaptureFromCAM(0) 
        
          5 
            
          6 
          whileTrue: 
        
          7 
              img=cv.QueryFrame(capture) 
        
          8 
              cv.ShowImage("camera", img) 
        
          9 
              ifcv.WaitKey(10)==27: 
        
          10 
                  break 
        
          11 
          cv.DestroyWindow("camera")

(This is the program to show your webcam)

UPDATE:

OpenCV has just released version 2.3.1 which is more stable than 2.2 I think. You can download ithere and try it (the setup is same as 2.2).
About the black screen you encounter with the example, I think it’s because your camera is not supported. My camera works fine. You can find more information here.

1 .下载 OpenCV 2.3.1 。文中下载了OpenCV-2.3.1-win-superpack (大概124MB,解压后1G多)。他不需编译，使用方便下载地址

2. OpenCV-2.3.1-win-superpack.exe是自解压文件，直接运行。即可解压。默认解压到opencv文件夹里。

3.下载numpy。opencv的python版需要该模块。下载页面在这里注意，下载和Python版本一致的numpy。文中下载的是numpy-1.6.1-win32-superpack-python2.7.exe，6.1M

opencv文件夹中，build->python->2.7 复制2.7下面的所有文件到C:\Python27\Lib\site-packages 中

注意这里的其他样例有可能一闪而过，什么都不显示。一种原因是哪个脚本需要参数，另一种是脚本中写图片文件路径错误，还有一种是urllib的问题，打开代码看看，应该比较容易理解。

Alternatively use the opencv-python installers at http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv.

Installing OpenCV on Windows 7 for Python 2.7

Setup OpenCV for Python in Windows

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