cv2.circle() method Last Updated : 13 Jun, 2025 Comments Improve Suggest changes Like Article Like Report OpenCV-Python is a library of Python bindings designed to solve computer vision problems. cv2.circle() method is used to draw a circle on any image. We use this image:Example: Python import cv2 path = r'C:\Users\user\Desktop\geeks14.png' src = cv2.imread(path) cv2.circle(src, center=(100, 100), radius=50, color=(0, 255, 0), thickness=2) cv2.imshow("Circle Drawn", src) cv2.waitKey(0) cv2.destroyAllWindows() Output Explanation: cv2.imread() loads the image and cv2.circle() draws a circle centered at (100, 100) with a radius of 50 pixels. The color (0, 255, 0) specifies green in BGR format and thickness=2 draws a 2-pixel wide outline.Syntaxcv2.circle(img, center, radius, color, thickness=None, lineType=None, shift=None)Parameters:Parameter DescriptionimgImage on which to draw (NumPy array).centerCenter of the circle (x, y) as a tuple of integers.radius Radius of the circle in pixels.colorCircle color as a BGR (Blue, Green, Red) tuple.thicknessCircle outline thickness. If -1, the circle is filled.lineType (Optional) Circle boundary type. Default is 8-connected line.shift (Optional) Number of fractional bits in center coordinates and radius.Returns: This function modifies the image directly. It does not return anything.ExamplesExample 1: In this example, we draw a filled red circle on the image. Python import cv2 path = r'C:\Users\user\Desktop\geeks14.png' src = cv2.imread(path) cv2.circle(src, center=(150, 150), radius=40, color=(0, 0, 255), thickness=-1) cv2.imshow("Filled Red Circle", src) cv2.waitKey(0) cv2.destroyAllWindows() OutputFilled Red CircleExplanation: cv2.imread() loads the image and cv2.circle() draws a filled red circle centered at (150, 150) with a radius of 40 pixels. The color (0, 0, 255) specifies red in BGR format and thickness = -1 fills the circle. Example 2: In this example, we draw multiple circles of different colors and sizes on the image. Python import cv2 path = r'C:\Users\user\Desktop\geeks14.png' src = cv2.imread(path) # Draw multiple circles cv2.circle(src, center=(50, 50), radius=20, color=(255, 0, 0), thickness=3) # Blue circle cv2.circle(src, center=(200, 200), radius=30, color=(0, 255, 0), thickness=5) # Green circle cv2.circle(src, center=(300, 100), radius=40, color=(0, 0, 255), thickness=2) # Red circle cv2.imshow("Multiple Circles", src) cv2.waitKey(0) cv2.destroyAllWindows() OutputMultiple CirclesExplanation: cv2.imread() loads the image and cv2.circle() draws blue, green and red circles at specified centers with different radii and thicknesses.Example 3: In this example, we draw a large filled blue circle. Python import cv2 path = r'C:\Users\user\Desktop\geeks14.png' src = cv2.imread(path) cv2.circle(src, center=(250, 250), radius=60, color=(255, 0, 0), thickness=-1) # Filled Blue Circle cv2.circle(src, center=(250, 250), radius=60, color=(0, 255, 255), thickness=8) # Thick yellow outline cv2.imshow("Thick Filled Circle", src) cv2.waitKey(0) cv2.destroyAllWindows() OutputThick Filled CircleExplanation: This draws a large filled blue circle at (250, 250) with radius 60. Then, a thick yellow outline (thickness=8) is drawn over the same circle to highlight it. Comment More infoAdvertise with us Next Article Python OpenCV | cv2.rectangle() method R Rajnis09 Follow Improve Article Tags : Python OpenCV Python-OpenCV Practice Tags : python Similar Reads OpenCV Tutorial in Python 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.OpenCVis a huge open-source library for computer vision, machin 3 min read Getting StartedWhat is OpenCV Library?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. In this article, we delve into OpenCV, exploring its functiona 5 min read Introduction to OpenCVOpenCV is one of the most popular computer vision libraries. 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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 timeRecognizing 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 7 min read OpenCV ProjectsBuild GUI Application Pencil Sketch from Photo in PythonIn 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 museum—provides a variet 5 min read Python OpenCV - Drowsiness DetectionThe 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 PythonFace Alignment is the technique in which the image of the person is rotated according to the angle of the eyes.  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 OpenCVThe 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 PythonIn 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 OpenCVImages 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 PythonIn 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 PythonIn 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 OpenCVIn 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.  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 PythonIn 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 - PythonFace 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 con 3 min read Real time object color detection using OpenCVIn 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 OpenCVIn 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-PythonIn 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, OpenCVIn 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 ProjectIn 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 - PythonPrerequisite: 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 OpenCVIn this article, we're going to see how to perform QR code scanning using a webcam. Webcam QR CODE Scanner 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 t 3 min read Color Identification in Images using Python - OpenCVAn 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. Don’t you 3 min read Real-Time Edge Detection using OpenCV in Python | Canny edge detection methodEdge 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 DetectionThe 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 Like