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The name of the virtual environment. To exit the virtual environment, use the deactivate command.Once inside the virtual environment, you can now install OpenCV. Execute the command below.pip3 install opencv-pythonInstall OpenCV with pipFrom the image above, you can see we have successfully installed OpenCV version 4.5.1.48. That’s it! You are done with OpenCV installation. To test OpenCV in your project, skip to the Test section at the bottom of the article.Method 2: Install OpenCV from the sourceIf you need a full installation of OpenCV, which includes patented algorithms, then you should use this method. Unlike the pip install method, which only takes a couple of minutes, compiling OpenCV from the source can take around two (2) hours. Follow the steps below:Step 1. Activate your virtual environment with the workon command below.workon sbb_cvStep 2. Download the source code for both OpenCV and Opencv_contrib from Github. Use the wget commands below.wget -O opencv_contrib.zip -O opencv.zip you get an error like ‘wget command not found,’ then you will need to install it with the command – sudo apt install wgetStep 3. We need to unzip the contents of the two files we downloaded. Use the unzip command as shown below:unzip opencv.zipunzip opencv_contrib.zipStep 4. After extracting the zip files, we will have two folders – opencv-4.5.2 and opencv_contrib-4.5.1. Let’s rename these two to something memorable like opencv and opencv_contrib.mv opencv-4.5.2 opencvmv opencv_contrib-4.5.1 opencv_contribRename foldersStep 5. Compiling OpenCV can be quite heavy on the Raspberry Pi memory. To avoid freezing or hanging, we can increase the SWAP space and utilize all four cores of the Pi in the compiling process. To do so, we will edit the dphys-swapfile present in the /etc. directory. Execute the command below to open dphys-swapfile with the nano editor.sudo nano /etc/dphys-swapfileFind the line – CONF_SWAPSIZE and set its value to

For a number of different reasons, you might want/need to build OpenCV from scratch instead of using the pre-built and official libraries provided by OpenCV. Since you’ve ended up reading this post, there’s a good chance that you already know why you might need to do this, but if you don’t, you can check out my similar post from a couple of years ago for some answers on this. That post was based on OpenCV 3.3 which is considered out-of-date these days, especially with OpenCV 4 out in the market (OpenCV 4.0.1 at the time of writing this article), so I decided to write a new tutorial to address some of the differences. So without without further ado, here we go. Please note that this tutorial is written with Windows users in mind but you should be able to build with “almost” the same steps under Linux and macOS as well. You just need to convert the steps with MinGW to default make command in Linux/Unix.First things first, the prerequisites for building OpenCV 4.x for Android are:OpenCV 4.x source codes of course (You can get them here in a zip file if you choose sources instead of pre-built binaries or you can clone then from here, I’ll use OpenCV 4.0.1 just for reference)CMake (Get the latest version from CMake website, I’ll use CMake 3.13.3)Get MinGW (If you’re a Qt fan and you want to use it for building Android app, Qt installer includes MinGW by default so you can use that one, otherwise refer to the official MinGW website to get it)Android Studio (It’s available here, download the latest version available.)Use SDK manager in Android Studio to get the latest Android SDK and NDKImportant note for OpenCV version 4.0.1 prerequisites: You’ll need Android NDK Revision 16b for properly building this

OpenCV (Open Source Computer Vision Library) is an open-source computer vision and machine learning software library. OpenCV-Python is a Python wrapper for the original OpenCV C++ library. Let’s see how it install OpenCV in python.IntroductionOpenCV enables users to perform image and video processing tasks with ease. In this blog post, we will provide a step-by-step guide on installing OpenCV-Python in various operating systems, including Windows, macOS, and Linux. We will also cover some common issues that users may encounter during the installation process.1. Pre-requisitesBefore installing OpenCV-Python, ensure that your system meets the following requirements:Python 3.6 or later installed (You can download Python from (Python Package Installer) installed with your Python distribution2. Install opencv pythonThe easiest way to install OpenCV-Python is by using pip. The commands are the same for all operating systems. Open a terminal or command prompt and enter the following command:pip install opencv-pythonTo install the package with additional contrib modules (which provide extended functionality), use:pip install opencv-contrib-python3. Verifying the Installation:Once the installation is complete, you can verify it by running a simple Python script. Open your Python IDE or create a new Python file and enter the following code:import cv2print("OpenCV-Python Version:", cv2.__version__)If the installation was successful, running the script will display the OpenCV-Python version.4. Installation on Various Operating SystemsWhile the pip command works across different platforms, there might be some OS-specific considerations when installing OpenCV-Pythona) Windows:On Windows, the process is straightforward. Just follow the steps mentioned above in 2. Installing OpenCV-Python to install OpenCV-Python using pip.b) macOS:On macOS, you may need to install additional libraries before installing OpenCV-Python. Run the following command to install Homebrew, a package manager for macOS:/bin/bash -c "$(curl -fsSL installing Homebrew, install the required libraries using the following command:brew install pkg-config libffi glibNow, proceed with the pip installation as described in 2. Installing OpenCV-Python.c) Linux:On Linux, you may need to install some additional libraries before installing OpenCV-Python. For Ubuntu/Debian-based systems, run the following command:sudo apt-get update && sudo apt-get install -y libsm6 libxext6 libxrender-devFor CentOS/Fedora-based systems, use the following command:sudo yum install libXext libSM libXrenderAfter installing the required libraries, proceed with the pip installation