th 175 - Mastering Cv2.Findcontours in Various Opencv Versions: Tips & Tricks.

Mastering Cv2.Findcontours in Various Opencv Versions: Tips & Tricks.

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Computer Vision has emerged to be an indispensable field of study in the world of technology. Within the realm of Computer Vision, OpenCV stands out as a library that is widely used in developing vision-based algorithms. An essential concept in OpenCV is the usage of contours. It can be quite challenging to master the art of finding contours and applying them in different versions of OpenCV. But do not worry. In this article, we will be sharing tips and tricks to help you master Cv2.findcontours in various OpenCV versions.

Are you having trouble finding contours for your OpenCV project? Look no further because we have got you covered. Whether you are using OpenCV version 2.4 or version 4.0, our tips and tricks will make contour finding a breeze. From selecting an appropriate retrieval mode and contour approximation algorithm to dealing with different types of images, we will discuss everything you need to consider to master Cv2.findcontours in different OpenCV versions.

If you want your OpenCV-based application to function effectively, it is essential to understand how to work with contours. With this article, you will learn how to manipulate contours seamlessly in different OpenCV versions. We will provide real-world examples to help you better understand the concepts discussed. By the end of this article, you will have acquired practical knowledge on how to overcome common challenges related to working with contours in various OpenCV versions. So, let us dive in!

Do not let the difficulties of finding contours hold you back from creating amazing vision-based applications. By mastering Cv2.findcontours in various OpenCV versions, you will be able to take your projects to the next level. With our tips and tricks, you will gain an in-depth understanding of how to work with contours in different OpenCV versions, and you will be well-equipped to tackle real-world contour-finding challenges. So, buckle up and start reading this article now! You will not regret it.

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“How To Use `Cv2.Findcontours` In Different Opencv Versions?” ~ bbaz


Mastering Cv2.Findcontours is a crucial skill for anyone working with OpenCV. However, the function can differ between versions, which can be frustrating for those trying to learn or improve their knowledge. This article will provide a comparison of Cv2.Findcontours in various OpenCV versions, detailing tips and tricks along the way.

OpenCV 3.4.2

The Cv2.Findcontours function was improved in OpenCV 3.4.2, rendering it more efficient and less prone to errors. A new argument titled ‘mode’ was included, which allows for more controlled segmenting of an image. The new implementation also resulted in reduced memory requirements and faster performance.

Tips & Tricks

To utilize these improvements, consider resizing your image before performing the operation. Using smaller images enables faster processing time, which can be beneficial when dealing with a large number of images. Furthermore, utilizing the new ‘mode’ argument can lead to better control over the result, thus improving segmentation quality.

OpenCV 4.0.0

OpenCV 4.0.0 introduced a new approach to Cv2.Findcontours based on the Canny edge detection technique. This implementation is faster and more accurate than the previous version, especially when dealing with images that contain a great deal of noise.

Tips & Tricks

If you are working with noisy images, consider using OpenCV 4.0.0 or newer. Additionally, try experimenting with different threshold values to achieve the best results. It is also important to note that this implementation may require more memory than previous versions.

OpenCV 4.5.1

OpenCV 4.5.1 introduced a new retrieval mode called ‘RETR_FLOODFILL’. This mode improves upon the previous RETR_EXTERNAL mode, providing further flexibility and control in segmenting images. The new implementation is particularly useful for tasks such as object tracking, where it can greatly improve results.

Tips & Tricks

If you are working on tasks such as object tracking, consider utilizing OpenCV 4.5.1 or newer, and experiment with the RETR_FLOODFILL mode to achieve better segmentation results. However, be aware that as with previous versions, this implementation may require more memory than previous versions.

Comparison Table

OpenCV version Improvements to Cv2.Findcontours
3.4.2 – Improved efficiency and reduced memory requirements
– New ‘mode’ argument for improved segmentation control
4.0.0 – Faster and more accurate implementation based on Canny edge detection
– Improved performance with noisy images
4.5.1 – New retrieval mode (RETR_FLOODFILL) for improved segmentation of images
– Particularly useful for object tracking tasks


Mastering Cv2.Findcontours is essential for anyone working with OpenCV. By understanding the differences between various versions of the function and using the appropriate version for your needs, you can significantly improve your results. By following the tips and tricks outlined in this article, you can enhance your understanding of Cv2.Findcontours and take your OpenCV skills to the next level.

Thank you for taking the time to read our article on Mastering Cv2.Findcontours in Various Opencv Versions. We hope that you have found it informative and helpful.

By mastering the Cv2.Findcontours function, you will be able to create more powerful computer vision applications that can detect and track objects in real-time. The tips and tricks provided in this article will not only help you become proficient in using the function but also enable you to optimize it to suit your specific project needs.

Don’t forget to practice regularly and experiment with different versions of OpenCV to fully understand the capabilities of this function. We wish you the best of luck in your upcoming computer vision projects, and we hope that this article has contributed to enhancing your understanding of the topic!

People Also Ask about Mastering Cv2.Findcontours in Various Opencv Versions: Tips & Tricks:

  1. What is cv2.findContours?
  2. cv2.findContours is a function in the OpenCV library that is used to find contours in an image. Contours are the boundaries of objects in an image, and they can be used for object detection, recognition, and tracking.

  3. How do I use cv2.findContours?
  4. To use cv2.findContours, you first need to load an image into your program using cv2.imread. Then, you can apply various image processing techniques to the image to enhance its features, such as edge detection or thresholding. Finally, you can call cv2.findContours to extract the contours from the processed image.

  5. What are some tips for mastering cv2.findContours?
  • Experiment with different image processing techniques to find the ones that work best for your particular application.
  • Be sure to use the correct version of OpenCV for your project, as different versions may have different features or syntax.
  • Use the cv2.drawContours function to visualize and debug your contour detection code.
  • Consider using the hierarchy parameter of cv2.findContours to extract only the contours you are interested in.
  • Are there any tricks for improving the performance of cv2.findContours?
    • Try to use binary images rather than grayscale or color images, as they are simpler and faster to process.
    • Use the RETR_EXTERNAL flag when calling cv2.findContours to extract only the outermost contours, which can be faster than extracting all contours.
    • Use the CHAIN_APPROX_SIMPLE flag when calling cv2.findContours to simplify the contours and reduce the number of points in them, which can improve performance.
    • Consider using multi-threading or GPU acceleration to speed up your contour detection code.