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The cv2.findContours function in OpenCV is used to detect contours in a binary image. Contours are useful for shape analysis and object detection.
Example
import cv2import numpy as np# Load the imageimage = cv2.imread('shapes.jpg')gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)# Apply thresholdingret, thresh = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)# Find contourscontours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)# Draw contourscv2.drawContours(image, contours, -1, (0, 255, 0), 3)# Display the resultcv2.imshow('Contours', image)cv2.waitKey(0)cv2.destroyAllWindows()In this example:
Load the Image: The image is loaded and converted to grayscale.
Thresholding: A binary threshold is applied to the grayscale image.
Find Contours: The cv2.findContours function detects contours in the binary image.
Draw Contours: The detected contours are drawn on the original image.
Important Considerations
Python OpenCV cv2.drawContours() Guide - PyTutorial
Jan 15, 2025 · Learn how to use Python OpenCV cv2.drawContours() to draw contours on images. Step-by-step guide with examples and code.
Find and Draw Contours using OpenCV | Python
Jan 4, 2023 · OpenCV has findContour() function that helps in extracting the contours from the image. It works best on binary images, so we should first …
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Feb 23, 2015 · Specifically, you need to replace the cv2.CHAIN_APPROX_SIMPLE flag with cv2.CHAIN_APPROX_NONE to get the full representation. Take a look at the OpenCV doc on …
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Dec 20, 2019 · Find and Draw Contours using OpenCV in Python - For the purpose of image analysis we use the Opencv (Open Source Computer Vision Library) python library. The library …
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Apr 24, 2021 · In this article, we will see how to use OpenCV to draw contour lines on a simple image. OpenCV provides us with the findContours function which finds the contours in an image and stores it as a...
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Mar 29, 2021 · Steps for finding and drawing contours using OpenCV. Drawing contours using CHAIN_APPROX_SIMPLE. Parent-child relationship. Some really cool applications have been built, using contours for motion detection or …
Contours : Getting Started — OpenCV-Python …
To draw the contours, cv2.drawContours function is used. It can also be used to draw any shape provided you have its boundary points. Its first argument is source and destination image, second argument is the contours which should …
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OpenCV has a cv2.drawContours() function, which allows us to draw the contours of an image. Now there are really 2 distinctions for contours of objects in images. There are external …
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5 days ago · How to draw the contours? To draw the contours, cv.drawContours function is used. It can also be used to draw any shape provided you have its boundary points. Its first …
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In this tutorial, we will go through the basics of how to detect and draw contours around objects in an image using OpenCV. We will also learn how to draw a bounding box around these objects. …
OpenCV Python - Image Contours - Online Tutorials Library
After detecting the contour vectors, contours are drawn over the original image by using the cv.drawContours() function. The command for the cv.drawContours() function is as follows − …
OpenCV: draw contours of objects in the binary image
Jun 6, 2017 · Both cv2.findContours and cv2.drawContours are destructive methods, which modify the original input image, and the latter is only applicable to RBG images for plotting, …
Python----计算机视觉处理（Opencv：绘制图像轮廓：寻找轮廓，fi…
Mar 24, 2025 · 文章浏览阅读852次，点赞16次，收藏22次。轮廓是图像中目标物体或区域的外部边界线或边界区域，由一系列相连的像素构成封闭形状，代表了物体的基本外形。与边缘不 …
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Nov 19, 2019 · In this blog, we will discuss the builtin functions provided by OpenCV for finding and drawing contours. So, let’s get started. OpenCV provides the following builtin function for …
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Mar 21, 2023 · OpenCV provides the findContours() function to detect contours in a binary image. The function identifies contours by analyzing the image’s pixel intensity, connecting adjacent …
How to draw contours using opencv in Python? - Stack Overflow
Feb 23, 2018 · cv2.findContours returns a tuple, not just the contours. You can do like this: if cv2.__version__.startswith("3."): _, contours, _ = cv2.findContours(bimg.copy(), …
OpenCV: Contours : Getting Started - GitHub Pages
How to draw the contours? To draw the contours, cv2.drawContours function is used. It can also be used to draw any shape provided you have its boundary points. Its first argument is source …
python - Overlay filled semi-transparent contours - Stack Overflow
May 7, 2021 · I'm trying to find the contours of an image and overlay them (with some transparency) over another image. However, when I execute the following code I get an …
python - cv.findContours () tuple must have length 2 or 3 - Stack …
OpenCV 4.x (also 2.x I think)'s findContours returns a tuple of (contours, hierarchy).. OpenCV 3.x had an additional return value in the tuple that was an accident of implementation. The …
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