Install OpenCV-Python in Ubuntu-白红宇

Install OpenCV-Python in Ubuntu

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发布时间：2019-06-19

本文共 2309 字，大约阅读时间需要 7 分钟。

之前安装python版opencv，需要下载whl文件，进行安装，这是在window环境下的：

安装系统python下的opencv

今天发现一个简单的方法。

Install package python-opencv with following command in terminal (as root user).$ sudo apt-get install python-opencvOpen Python IDLE (or IPython) and type following codes in Python terminal.import cv2 as cvprint(cv.__version__)If the results are printed out without any errors, congratulations !!! You have installed OpenCV-Python successfully.

针对conda环境下env安装python-opencv

发现有些坑

首先，我们直接编译opencv应该就有python的接口：/usr/local/lib/python3.5/dist-packages；发现有cv2.cpython-35m-x86_64-linux-gnu.so文件，说的直接拷贝到env下的site-packages,结果报错;

然后我们本身直接sudo apt-get install python-opencv安装的是直接可以使用的；

sudo直接安装按系统默认的python2.7上：/usr/lib/python2.7/dist-packages下面有cv2.x86_64-linux-gnu.so；

rjw@rjw:~$ /usr/bin/pythonPython 2.7.12 (default, Dec  4 2017, 14:50:18) [GCC 5.4.0 20160609] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> import cv2>>> cv2.__version__'2.4.9.1'

中间还有错：

参考的方法：

最终解决方法：conda install -c menpo opencv3 ：

(tensorflow) rjw@rjw:~$ pythonPython 3.5.6 |Anaconda, Inc.| (default, Aug 26 2018, 21:41:56) [GCC 7.3.0] on linuxType "help", "copyright", "credits" or "license" for more information.>>> import cv2>>> cv2.__version__'3.2.0'

直接conda install python-opencv在conda环境下找不到包

update2018.11.11;今天遇到个问题：

UnsatisfiableError: The following specifications were found to be in conflict:   - opencv3 -> python

重新使用：pip install opencv-python

(maskrcnn_benchmark) rjw@rjw:~/desktop$ pip install opencv-pythonCollecting opencv-python  Downloading https://files.pythonhosted.org/packages/d2/cf/1e5774811aa1b656fba8476e98edab2f99a7683c3aaeede057cdc9959c24/opencv_python-3.4.3.18-cp37-cp37m-manylinux1_x86_64.whl (25.0MB)    100% |████████████████████████████████| 25.0MB 72kB/s Requirement already satisfied: numpy>=1.14.5 in /home/rjw/anaconda3/envs/maskrcnn_benchmark/lib/python3.7/site-packages (from opencv-python) (1.15.4)Installing collected packages: opencv-pythonSuccessfully installed opencv-python-3.4.3.18

可以想想，在anaconda下怎么使用自己编译的opencv,这样就可以万能使用！！！

其他错误

遇到下面问题，使用conda install -c asmeurer pango ，参考

>>> import cv2Traceback (most recent call last):  File "
    
     ", line 1, in 
     
      ImportError: /usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined symbol: hb_font_funcs_set_variation_glyph_func

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