How to install opencv to python

How to Install OpenCV for Python in Linux?

Prerequisite: Python Language Introduction OpenCV is the huge open-source library for computer vision, machine learning, and image processing and now it plays a major role in real-time operation which is very important in today’s systems. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human. When it integrated with various libraries, such as Numpy, python is capable of processing the OpenCV array structure for analysis. To Identify image patterns and its various features we use vector space and perform mathematical operations on these features. To install OpenCV, one must have Python and PIP, preinstalled on their system. To check if your system already contains Python, go through the following instructions: Open the terminal using Ctrl+Alt+T Now run the following command: For Python2

For Python3.x

If Python is already installed, it will generate a message with the Python version available. If Python is not present, go through How to install Python on Linux? and follow the instructions provided. PIP is a package management system used to install and manage software packages/libraries written in Python. These files are stored in a large “on-line repository” termed as Python Package Index (PyPI). To check if PIP is already installed on your system, just go to the terminal and execute the following command:

If PIP is not present, go through How to install PIP on Linux? and follow the instructions provided.

Downloading and Installing OpenCV:

OpenCV can be directly downloaded and installed with the use of pip (package manager). To install OpenCV, just go to the terminal and type the following command:

pip3 install opencv-python

Beginning with the installation:

• Type the command in the Terminal and proceed:
• Collecting Information and downloading data:
• Installing Packages:
• Finished Installation:

To check if OpenCV is correctly installed, just run the following commands to perform a version check:

python3 >>>import cv2 >>>print(cv2.__version__)

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How to Install OpenCV or CV2 in Python (Anaconda, Spyder, VS Code)

OpenCV or Open Source Computer Vision Library is an open-source software library used for computer vision, image processing, and machine learning. It’s written in C++ and comprises over 500 algorithms and thousands of functions that help support those algorithms.

Therefore, it’s a widely-used library by individuals and corporations alike, mainly because it enables them to focus on building real-world applications relating to computer vision, image processing, and machine learning without starting from square one. This is thanks to OpenCV’s large number of algorithms and functions.

Furthermore, there are many advantages to using OpenCV, one of them being its hardware optimization capability . OpenCV uses multi-core processing and OpenCL to its advantage which may allow for hardware acceleration. However, OpenCV also has disadvantages, including being slightly less beginner-friendly due to its lack of documentation.

Overall, OpenCV is a powerful and useful library that is used by millions of people around the world. Plus, it can be very useful to people who are interested in the fields of computer vision, image processing, and machine learning.

That being said, OpenCV doesn’t come pre-installed with Python, which means you’ll have to install it yourself. You need to have Python and PIP installed on your system before installing OpenCV for Python. Else, you need to have Anaconda installed if you wish to install it there, especially for the Spyder IDE.

In this guide, we’ll go over how to install OpenCV in Anaconda and also in Python and how you can start coding with it in Spyder and Visual Studio Code.

Table of Contents

Installing OpenCV in Anaconda

Before following these steps, ensure that you have Anaconda installed on your system. If you don’t, you can find the steps to install Anaconda and the installation file from their official documentation here .

In order to install OpenCV in Anaconda:

conda install -c conda-forge opencv 

1. Once entered, you should see the following output in your terminal. When prompted, enter y to proceed with the installation.

Using OpenCV in Spyder

Spyder is an open-source and cross-platform IDE (Integrated Development Environment) built for Python. Spyder comes installed with Anaconda and can be used to develop programs with OpenCV.

Once OpenCV has been installed in Anaconda, you can proceed to use it in Spyder.

import cv2 print(cv2.__version__)

You can now proceed to code all sorts of programs with OpenCV and Python in Spyder!

Installing OpenCV in Python

In order to install OpenCV in Python:

1. First, verify if python is installed on your system by opening the Command Prompt and entering python –version .

If python is installed on your system, the version will be displayed. Else, if you don’t have python installed, you can download its installation file from Python’s Downloads page and proceed to install it for your device.

1. Secondly, verify if pip is installed on your system as we will be using pip to install OpenCV. So, enter pip -V in the command line.

Again, if pip is installed, the version will be displayed. Else if you don’t have pip installed, you can learn how to install it here .

1. Thirdly, install OpenCV by entering pip install opencv-python in the command line. Once OpenCV has been installed, you will receive the following confirmation message:

1. Lastly, enter import cv2 in the Python Terminal once OpenCV has been installed to verify if it works. There should be no error message shown once imported.

1. Additionally, you can also enter cv2.__version__ to check the version of OpenCV you have installed on your system.

Using OpenCV in Visual Studio Code

Visual Studio Code is an IDE that can also be used to develop OpenCV applications or programs using Python. As you might’ve figured, Visual Studio Code does not come preinstalled with Python or OpenCV. So, if you don’t have it on your system, Visual Studio Code can be installed from here .

Once OpenCV has been installed in Python, you can proceed to directly use it in Visual Studio Code by importing its cv2 package:

1. First, open VS Code and create a Python file. For this example, I will be using a file labelled test.py .

import cv2 print(cv2.__version__)

1. Press Ctrl + S to save the file and then right-click anywhere on the file to bring up the context menu.
2. Click on the “Run Python File in Terminal” option.

1. Then, if it was installed successfully, you should see an output indicating the version of OpenCV in the integrated Python terminal at the bottom of VS Code:

Conclusion

Learning how to develop computer vision, image processing, and machine learning applications using Python can be a huge boost to your expertise as these fields have never been in more demand!

There are many reasons why someone may want to develop applications using OpenCV. These include wanting to add on to their programming skills, bringing an idea they have to life, trying to enter the in-demand field of Artificial Intelligence, and many more. Plus, learning OpenCV can be very helpful when it comes to increasing someone’s job prospects and employability.

With that being said, in this article, we looked at how to install OpenCV in Anaconda and Python . Additionally, we also looked at how you can start using OpenCV in Spyder and VS Code.

Having said that, we hope you’ve found this guide helpful when it comes to installing OpenCV in Python or Anaconda and starting to code using an IDE.

Feel free to share this post with your fellow coders to guide them through installing OpenCV and getting started coding with it!

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How to install opencv to python

In this tutorial We will learn to setup OpenCV-Python in Ubuntu System. Below steps are tested for Ubuntu 16.04 and 18.04 (both 64-bit).

OpenCV-Python can be installed in Ubuntu in two ways:

• Install from pre-built binaries available in Ubuntu repositories
• Compile from the source. In this section, we will see both.

Another important thing is the additional libraries required. OpenCV-Python requires only Numpy (in addition to other dependencies, which we will see later). But in this tutorials, we also use Matplotlib for some easy and nice plotting purposes (which I feel much better compared to OpenCV). Matplotlib is optional, but highly recommended. Similarly we will also see IPython, an Interactive Python Terminal, which is also highly recommended.

Installing OpenCV-Python from Pre-built Binaries

This method serves best when using just for programming and developing OpenCV applications.

Install package python3-opencv with following command in terminal (as root user).

Open Python IDLE (or IPython) and type following codes in Python terminal.

If the results are printed out without any errors, congratulations . You have installed OpenCV-Python successfully.

It is quite easy. But there is a problem with this. Apt repositories may not contain the latest version of OpenCV always. For example, at the time of writing this tutorial, apt repository contains 2.4.8 while latest OpenCV version is 3.x. With respect to Python API, latest version will always contain much better support and latest bug fixes.

So for getting latest source codes preference is next method, i.e. compiling from source. Also at some point in time, if you want to contribute to OpenCV, you will need this.

Building OpenCV from source

Compiling from source may seem a little complicated at first, but once you succeeded in it, there is nothing complicated.

First we will install some dependencies. Some are required, some are optional. You can skip optional dependencies if you don’t want.

Required build dependencies

We need CMake to configure the installation, GCC for compilation, Python-devel and Numpy for building Python bindings etc.

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