在 Raspberry pi 3 中安装 openCV 失败

Question

当我尝试在 RAspberry Pi 3 B+ 中安装 OpenCV 时，出现以下错误：

$pip install opencv-python

Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
ERROR: Could not find a version that satisfies the requirement opencv-python (from versions: 
none)
ERROR: No matching distribution found for opencv-python

我也尝试过其他方法：

pip install opencv-contrib-python
pip3 install opencv-python
python3.6 -m pip install opencv-python

都给出相同的上述错误！

我尝试了其他几种方法：

sudo apt install python3-opencv
sudo apt-get install libopencv-dev python-opencv

仍然无法导入 cv2

ModuleNotFoundError: No module named 'cv2'

我试过menpo频道

conda install -c menpo opencv
PackagesNotFoundError: The following packages are not available from current channels:

请帮忙。 现在做什么？

Answer 1

OpenCv 目前适用于 Raspbian 9-Stretch。 更新操作系统：

sudo apt-get update
sudo apt-get upgrade

2）安装依赖：

sudo apt-get install build-essential cmake pkg-config
sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libgtk2.0-dev libgtk-3-dev
sudo apt-get install libatlas-base-dev gfortran

3) 安装 Python 3 和 Pip3：

sudo apt-get install python3-dev
sudo apt-get install python3-pip

4）安装Opencv：

pip3 install opencv-python

5) Opencv 和相机的额外依赖：

sudo apt-get install libqtgui4
sudo modprobe bcm2835-v4l2
sudo apt-get install libqt4-test

瞧！ 安装了 OpenCv2。