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What is OpenCV Library?

OpenCV Tutorial in Python

Last Updated : 07 Nov, 2024

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OpenCV, short for Open Source Computer Vision Library, is an open-source computer vision and machine learning software library. Originally developed by Intel, it is now maintained by a community of developers under the OpenCV Foundation.

OpenCV
is a huge open-source library for computer vision, machine learning, and image processing. OpenCV supports a wide variety of programming languages like Python, C++, Java, etc. It can process images and videos to identify objects, faces, or even the handwriting of a human. When it is integrated with various libraries, such as

which is a highly optimized library for numerical operations, then the number of weapons increases in your Arsenal i.e. whatever operations one can do in Numpy can be combined with OpenCV. This OpenCV tutorial will help you learn Image-processing from Basics to advanced, like operations on Images and videos using a huge set of Programs and projects.

OpenCV Tutorial in Python

OpenCV Tutorial in Python

Table of Content

1. Getting Started
2. Working with Images

2.1 Getting Started
2.2 Image Processing
2.3 Feature Detection and Description
2.4 Drawing Functions

3. Working with Videos

3.1 Getting Started
3.2 Video Processing

4. Applications and Projects
Further Learning

1. Getting Started

Learn how to set up and get started with OpenCV:

OpenCV – Overview
Introduction to OpenCV
Install OpenCV for Python on Windows
Install OpenCV for Python on Linux
Set up Opencv with anaconda environment

2. Working with Images

>> 2.1 Getting Started

Reading an image in OpenCV using Python
Display an image in OpenCV using Python
Writing an image in OpenCV using Python
OpenCV | Saving an Image
Color Spaces
Arithmetic operations on Images
Bitwise Operations on Binary Images

>> 2.2 Image Processing

Image Resizing
Eroding an Image
Blurring an Image
Create Border around Images
Grayscaling of Images
Scaling, Rotating, Shifting and Edge Detection
Erosion and Dilation of images
Analyze an image using Histogram
Histograms Equalization
Simple Thresholding
Adaptive Thresholding
Otsu Thresholding
Segmentation using Thresholding
Convert an image from one color space to another
Filter Color with OpenCV
Denoising of colored images
Visualizing image in different color spaces
Find Co-ordinates of Contours
Bilateral Filtering
Image Inpainting using OpenCV
Intensity Transformation Operations on Images
Image Registration
Background subtraction
Background Subtraction in an Image using Concept of Running Average
Foreground Extraction in an Image using Grabcut Algorithm
Morphological Operations in Image Processing (Opening)
Morphological Operations in Image Processing (Closing)
Morphological Operations in Image Processing (Gradient)
Image segmentation using Morphological operations
Image Translation
Image Pyramid

>> 2.3 Feature Detection and Description

Line detection using Houghline method
Circle Detection
Detect corner of an image
Corner Detection with Shi-Tomasi method
Corner detection with Harris Corner Detection
Find Circles and Ellipses in an Image
Document field detection
Smile detection

>> 2.4 Drawing Functions

Draw a line
Draw arrow segment
Draw an ellipse
Draw a circle
Draw a rectangle
Draw a text string
Find and Draw Contours
Draw a triangle with centroid

3. Working with Videos

>> 3.1 Getting Started

Play a video using OpenCV

>> 3.2 Video Processing

Create video using multiple images
Extract images from video

4. Applications and Projects

Extract frames using OpenCV
Displaying the coordinates of the points clicked on the image using Python-OpenCV
White and black dot detection
OpenCV BGR color palette with trackbars
Draw rectangular shape and extract objects
Invisible Cloak using OpenCV
Unsupervised Face Clustering Pipeline
Saving Operated Video from a webcam
Face Detection using Python and OpenCV with webcam
Opening multiple color windows
Play a video in reverse mode
Template matching using OpenCV in Python
Cartooning an Image using OpenCV – Python
Vehicle detection in a Video frame using Python – OpenCV
Count number of Faces using Python – OpenCV
Live Webcam Drawing using OpenCV
Detect and Recognize Car License Plate from a video in real time

Further Learning

If you’re interested in more recent articles and updates on OpenCV, explore the latest content here:

Recent Articles on OpenCV !!

What is OpenCV Library?

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Vehicle detection using OpenCV Python

Object Detection means identifying the objects in a video or image. In this article, we will learn how to detect vehicles using the Haar Cascade classifier and OpenCV. We will implement the vehicle detection on an image and as a result, we will get a video in which vehicles will be detected and it w

3 min read
Count number of Faces using Python - OpenCV

Prerequisites: Face detection using dlib and openCV In this article, we will use image processing to detect and count the number of faces. We are not supposed to get all the features of the face. Instead, the objective is to obtain the bounding box through some methods i.e. coordinates of the face i

3 min read
Live Webcam Drawing using OpenCV

Let us see how to draw the movement of objects captured by the webcam using OpenCV. Our program takes the video input from the webcam and tracks the objects we are moving. After identifying the objects, it will make contours precisely. After that, it will print all your drawing on the output screen.

3 min read
Detect and Recognize Car License Plate from a video in real time

Recognizing a Car License Plate is a very important task for a camera surveillance-based security system. We can extract the license plate from an image using some computer vision techniques and then we can use Optical Character Recognition to recognize the license number. Here I will guide you thro

11 min read

Essential OpenCV Functions to Get Started into Computer Vision

Computer vision is a process by which we can understand the images and videos how they are stored and how we can manipulate and retrieve data from them. Computer Vision is the base or mostly used for Artificial Intelligence. Computer-Vision is playing a major role in self-driving cars, robotics as w

OpenCV Projects

Build GUI Application Pencil Sketch from Photo in Python

In this article, we will cover how to convert images to watercolor sketches and pencil sketch Linux. Sketching and painting are used by artists of many disciplines to preserve ideas, recollections, and thoughts. Experiencing art from painting and sculpting to visiting an art museumâ€”provides a variet

5 min read
Python OpenCV - Drowsiness Detection

The number of fatalities on the road due to drowsiness is very high. Thus python allows the model of deep learning algorithm via including the use of OpenCV. Drowsiness Detection is the detection of a person to check whether the person is feeling sleepy while performing a significant task. This dete

9 min read
Face Alignment with OpenCV and Python

Face Alignment is the technique in which the image of the person is rotated according to the angle of the eyes. Â This technique is actually used as a part of the pipeline process in which facial detection is done using the image. This implementation of face alignment can be easily done with the help

6 min read
Age Detection using Deep Learning in OpenCV

The task of age prediction might sound simple at first but it's quite challenging in real-world applications. While predicting age is typically seen as a regression problem this approach faces many uncertainties like camera quality, brightness, climate condition, background, etc. In this article we'

5 min read
Right and Left Hand Detection Using Python

In this article, we are going to see how to Detect Hands using Python. We will use mediapipe and OpenCV libraries in python to detect the Right Hand and Left Hand. We will be using the Hands model from mediapipe solutions to detect hands, it is a palm detection model that operates on the full image

5 min read
OpenCV Python: How to detect if a window is closed?

OpenCV in Python provides a method cv2.getWindowProperty() to detect whether a window is closed or open. getWindowProperty() returns -1 if all windows are closed. This is one of the main problems we face while using the OpenCV package, sometimes it's hard to detect whether the window is open or clos

2 min read
Save frames of live video with timestamps - Python OpenCV

Images are very important data nowadays from which we can obtain a lot of information which will helpful for analysis. Sometimes data to be processed can be in the form of video. To process this kind of data we have to read video extract frames and save them as images. Security camera videos we have

3 min read
Detecting low contrast images with OpenCV, scikit-image, and Python

In this article, we are going to see how to detect low contrast images with OpenCV, scikit-image using Python A low contrast image has the minimal distinction between light and dark parts, making it difficult to tell where an object's boundary begins and the scene's background begins. For example Th

2 min read
Animate image using OpenCV in Python

In this article, we will discuss how to animate an image using python's OpenCV module. Let's suppose we have one image. Using that single image we will animate it in such a way it will appear continuous array of the same image. This is useful in animating the background in certain games. For example

3 min read
Drawing a cross on an image with OpenCV

In this article, we are going to discuss how to draw a cross on an image using OpenCV-Python. We can draw an overlay of two lines one above another to make a cross on an image. Â To draw a line on OpenCV, the below function is used. Syntax: cv2.line(image, starting Point, ending Point, color, thickn

5 min read
Blur and anonymize faces with OpenCV and Python

In this article, we are going to see how to Blur and anonymize faces with OpenCV and Python. For this, we will be using Cascade Classifier to detect the faces. Make sure to download the same, from this link: haarcascade_frontalface_default.xml ApproachFirstly, we use a built face detection algorithm

4 min read
Face Detection using Cascade Classifier using OpenCV - Python

Face detection is a important task in computer vision and Haar Cascade classifiers play an important role in making this process fast and efficient. Haar Cascades are used for detecting faces and other objects by training a classifier on positive and negative images. Positive Images: These images co

3 min read
Real time object color detection using OpenCV

In this article, we will discuss how to detect a monochromatic colour object using python and OpenCV. Monochromatic color means light of a single wavelength. We will use the video, captured using a webcam as input and try to detect objects of a single color, especially Blue. But you can detect any c

4 min read
Python - Writing to video with OpenCV

In this article, we will discuss how to write to a video using OpenCV in Python. ApproachImport the required libraries into the working space.Read the video on which you have to write. Syntax: cap = cv2.VideoCapture("path")Create a output file using cv2.VideoWriter_fourcc() method Syntax: output = c

1 min read
Add image to a live camera feed using OpenCV-Python

In this article, we are going to learn how to insert an image in your live camera feed using OpenCV in Python. Stepwise ImplementationStep 1: Importing the libraries CV reads and stores all the images as a NumPy array. We need the NumPy library to manipulate the image and as expected we need the cv2

4 min read
Face and Hand Landmarks Detection using Python - Mediapipe, OpenCV

In this article, we will use mediapipe python library to detect face and hand landmarks. We will be using a Holistic model from mediapipe solutions to detect all the face and hand landmarks. We will be also seeing how we can access different landmarks of the face and hands which can be used for diff

4 min read
Emotion Based Music Player - Python Project

In this article, we will be discussing how can we recommend music based on expressions or say dominant expressions on someone's face. This is a basic project in which we will be using OpenCV, Matplotlib, DeepFace, and Spotify API. Import Packages and ModulesOpenCV: OpenCV is a Python open-source pac

6 min read
Realtime Distance Estimation Using OpenCV - Python

Prerequisite: Introduction to OpenCV In this article, we are going to see how to calculate the distance with a webcam using OpenCV in Python. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human. This article focuses on detecting objects. We w

5 min read
Webcam QR code scanner using OpenCV

In this article, we're going to see how to perform QR code scanning using a webcam.Â Before starting, You need to know how this process is going to work. Firstly you need to open your webcam, and you've to run your python program to make it ready to scan the QR code. You can take the Qr code picture

3 min read
Color Identification in Images using Python - OpenCV

An open-source library in Python, OpenCV is basically used for image and video processing. Not only supported by any system, such as Windows, Linux, Mac, etc. but also it can be run in any programming language like Python, C++, Java, etc. OpenCV also allows you to identify color in images. Donâ€™t you

3 min read
Real-Time Edge Detection using OpenCV in Python | Canny edge detection method

Edge detection is one of the fundamental image-processing tasks used in various Computer Vision tasks to identify the boundary or sharp changes in the pixel intensity. It plays a crucial role in object detection, image segmentation and feature extraction from the image. In Real-time edge detection,

5 min read
Opencv Python program for Face Detection

The objective of the program given is to detect object of interest(face) in real time and to keep tracking of the same object.This is a simple example of how to detect face in Python. You can try to use training samples of any other object of your choice to be detected by training the classifier on

2 min read

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