【问题标题】：install opencv-python using Python3 in Ubuntu 15.04在 Ubuntu 15.04 中使用 Python3 安装 opencv-python
【发布时间】：2017-09-14 06:35:05
【问题描述】：

我希望在 Ubuntu 15.04 机器上通过命令安装 opencv-python

pip3 install opencv-python

但是一旦我运行这个命令，我就会得到以下错误：

Downloading/unpacking opencv-python
Could not find any downloads that satisfy the requirement opencv-python
Cleaning up...
No distributions at all found for opencv-python
Storing debug log for failure in /home/Nadeem/.pip/pip.log

任何帮助将不胜感激。谢谢！！

【问题讨论】：

标签： python python-3.x opencv ubuntu

【解决方案1】：

首先使用sudo 升级pip。

arsho:~/workspace $ sudo pip3 install --upgrade pip                                                                                       
Successfully installed pip

现在使用sudo 命令再次安装opencv-python。

arsho:~/workspace $ sudo pip3 install opencv-python
Successfully installed numpy-1.13.1 opencv-python-3.3.0.10

最后使用pip查看opencv-python的版本和位置信息。

arsho:~/workspace $ pip3 show opencv-python
---
Name: opencv-python
Version: 3.3.0.10
Location: /usr/local/lib/python3.4/dist-packages
Requires: numpy

我在https://c9.io/ 中使用Ubuntu 14.04.5 LTS 对此进行了测试。

【讨论】：

【解决方案2】：

您可以从源代码安装 opencv。
按照this 链接这样做。
或者您可能需要使用以下命令升级您的 pip3

pip3 install --upgrade pip

编辑

为了完整起见（如果链接断开），我在此处列出了在 Ubuntu 上从源代码编译和安装 OpenCV 的步骤（在带有 python 3 的 Ubuntu 14.04 LTS 上测试）。

第 1 步更新软件包

sudo apt-get update
sudo apt-get upgrade

步骤 2 安装依赖项

sudo apt-get install build-essential cmake git pkg-config # Developer tools required to compile opencv
sudo apt-get install libjpeg8-dev libtiff4-dev libjasper-dev libpng12-dev # Libraries required to read various image format from disk
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev # Libraries required to read various video formats
sudo apt-get install libgtk2.0-dev # Required by opencv for GUI features
sudo apt-get install libatlas-base-dev gfortran # Packages used by opencv to optimize various functions.

pip3 install --upgrade pip

步骤 3 设置虚拟环境（使用 conda）

conda create -n opencv-exmaple-env python=3.6

source activate opencv-exmaple-env # Activate the envirnoment

Step 4 安装编译opencv所需的包

sudo apt-get install python3.6-dev # If the python version is not 3.6 then make changes to this command accordingly. 
pip install numpy # This should be done after the environment in Step 3 is activated

第 5 步：使用 Python 3.4+ 绑定构建和安装 OpenCV 3.0

5.1 克隆opencv源码

cd ~
mkdir opencv-source
cd opencv-source
git clone https://github.com/Itseez/opencv.git
cd opencv
git checkout 3.3.0 # Branch you want to compile from

5.2 克隆 Opencv Contrib 代表

包含额外的功能，例如标准关键点检测器和局部不变描述符（例如 SIFT、SURF 等）


cd ~
mkdir opencv-contrib
cd opencv-contrib
git clone https://github.com/Itseez/opencv_contrib.git
cd opencv_contrib
git checkout 3.3.0 # The version you want to compile

5.3 编译、构建和安装

cd ~/opencv-source/opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_C_EXAMPLES=ON \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv-contrib/opencv_contrib/modules \
    -D BUILD_EXAMPLES=ON ..
make -j4
sudo make install
sudo ldconfig

5.4 将安装的opencv目标文件链接到python站点包

ln -s /usr/local/lib/python3.6/site-packages/cv2.so /path-to-python-sitepackages-of-the-environment/cv2.so

6 验证安装

import cv2

如果上面的代码运行没有错误，说明opencv安装成功。

【讨论】：