Installing ROpenCVLite
should go smoothly on all major operating systems (Mac, Windows, and
most major Linux distributions). There are a few steps to follow before
installing the package itself in order to prepare all the necessary
external (i.e. non-R) dependencies for OpenCV. You should also make
sure that your R version is 4.0 or higher. Support for older versions of
R has been removed.
All installation steps are described below.
Before installing ROpenCVLite, you will need to install
Rtools
and CMake.
You will need to install the version of Rtools that
corresponds to your version of R. You can check your version of R by
typing R.version in the R console.
Rtools40.Rtools42.Rtools43.There are multiple ways to install Rtools on
Windows:
Use the convenience function provided by the installr
library:
Note: If you install Rtools40, make sure to
tell the installer to add Rtools to your “PATH” during the
installation process. This is not required anymore with
Rtools42 and Rtools43.
If you have the rig utility
installed on your computer, you can install Rtools from a
terminal running PowerShell:
If you have the winget
utility installed on your computer, you can install Rtools
from a terminal running PowerShell:
Note: Only Rtools42 seems to be available
through winget at the moment.
You can manually download Rtools at https://cran.r-project.org/bin/windows/Rtools/.
Note: If you install Rtools40, make sure to
tell the installer to add Rtools to your “PATH” during the
installation process. This is not required anymore with
Rtools42 and Rtools43.
Installing Cmake is only required if your R version
starts with 4.0 or 4.1 and, therefore, you have installed
Rtools40. For newer versions of R, Cmake is
included in Rtools42 and Rtools43 and you can
skip this step.
Any version of Cmake 3.24 or higher should work. There
are multiple ways to install Cmake on Windows:
Use the convenience function provided by the installr
library:
During the installation process, make sure to tell the installer to
add CMake to your “PATH”.
If you have the winget
utility installed on your computer, you can install Cmake
from a terminal running PowerShell:
You can manually download the CMake installer for
Windows at https://cmake.org/download/. Make
sure to tell the installer to add CMake to your “PATH”
during the installation process.
Before installing ROpenCVLite, you will need to install
the latest version of CMake. There are multiple
ways to install Cmake on Mac:
If you have homebrew
installed, run the following command in your terminal:
If you have MacPorts installed,
run the following command in your terminal:
Go to https://cmake.org/download/.
Scroll down until you reach the “Latest Release” section. Download the
installer for Mac OS X (.dmg file). Once the download is complete,
double-click on the installer and accept the license agreement. Drag and
drop the Cmake app into your Applications
folder.
To make Cmake accessible to R, open a
terminal and type:
sudo "/Applications/CMake.app/Contents/bin/cmake-gui" --install
It will ask for your administrator password.
Before installing ROpenCVLite, you will need to install
the latest version of CMake. Hereafter are two
options to do this on Linux.
Use your distribution’s package management system. For instance on
Ubuntu-like systems, you can install Cmake by typing the
following command in your terminal:
Other distributions will have different package managers. Refer to
the documentation of your distribution for finding the proper way to
install Cmake on your system.
Download CMake for Linux at https://cmake.org/download/.
However it is recommended that you install it using your distribution’s
package management system.
ROpenCVLiteYou can install ROpenCVLite from CRAN as follows:
Or you can install the latest development version (not recommended) as follows:
This will not install OpenCV yet. You will be asked
whether you want to install it the first time you load the package.
This step can take some time. Go make yourself a cup of coffee or two
while ROpenCVLite downloads, compiles and installs
OpenCV on your system.
In addition, you can also request the (re)installation of
OpenCV at any time as follows:
ROpenCVLite will also automatically detect when a new
version of OpenCV is available and will offer to update it
for you.