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update to OpenCV section

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Romain Bazile 2020-07-20 22:06:23 +02:00
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README.md
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@ -302,10 +302,32 @@ In order to send and receive data from python, you need this library. Run the fo
pip3 install paho-mqtt
```
### Install OpenCV
Use the quick version without virtual env
https://www.pyimagesearch.com/2019/09/16/install-opencv-4-on-raspberry-pi-4-and-raspbian-buster/
We need to install the latest OpenCV version. Unfortunately, it is not available in the repositories. We are going to install it directly by using pip.
First, we need to install the needed dependencies, then we will directly install opencv:
```sh
sudo apt install libgtk-3-0 libavformat58 libtiff5 libcairo2 libqt4-test libpango-1.0-0 libopenexr23 libavcodec58 libilmbase23 libatk1.0-0 libpangocairo-1.0-0 libwebp6 libqtgui4 libavutil56 libjasper1 libqtcore4 libcairo-gobject2 libswscale5 libgdk-pixbuf2.0-0 libhdf5-dev libilmbase-dev libopenexr-dev libgstreamer1.0-dev libavcodec-dev libavformat-dev libswscale-dev libwebp-dev libatlas-base-dev
sudo pip3 install opencv-contrib-python==4.1.0.25
```
You can now check that opencv is properly installed by running a python interpreter and importing the cv2 module.
```sh
pi@planktoscope:~ $ python3
Python 3.7.3 (default, Dec 20 2019, 18:57:59)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'4.1.0'
>>> quit()
```
If all goes well, the displayed version number should be `4.1.0`.
More detailed information can be found on this [website](https://www.pyimagesearch.com/2019/09/16/install-opencv-4-on-raspberry-pi-4-and-raspbian-buster/).
### Install MorphoCut