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OpenCV Python Tutorial For Beginners 23 – Find and Draw Contours with OpenCV in Python

admin by admin
May 10, 2020
in Du Lịch
17
OpenCV Python Tutorial For Beginners 23 – Find and Draw Contours with OpenCV in Python



In this video on OpenCV Python Tutorial For Beginners, I am going to show How to Find contours and draw contours using OpenCV in Python.
We will see what contours are. we will Learn to find contours, draw contours, we will see these functions : cv2.findContours(), cv2.drawContours().
The function retrieves contours from the binary image. The contours are a useful tool for shape analysis and object detection and recognition.

Gist of code I used in this video (Find and Draw Contours Tutorial ) –

OpenCV is an image processing library created by Intel and later supported by Willow Garage and now maintained by Itseez. opencv is available on Mac, Windows, Linux. Works in C, C++, and Python.
it is Open Source and free. opencv is easy to use and install.

Starting with an overview of what the course will be covering, we move on to discussing morphological operations and practically learn how they work on images. We will then learn contrast enhancement using equalization and contrast limiting. Finally we will learn 3 methods to subtract the background from the video and implement them using OpenCV.

At the end of this course, you will have a firm grasp of Computer Vision techniques using OpenCV libraries. This course will be your gateway to the world of data science.

Feel the real power of Python and programming! The course offers you a unique approach of learning how to code by solving real world problems.

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DISCLAIMER: This video and description contains affiliate links, which means that if you click on one of the product links, I’ll receive a small commission. This help support the channel and allows us to continue to make videos like this. Thank you for the support!

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Comments 17

  1. Rustam Temirov says:
    2 years ago

    Can anybody help me?

    contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)

    cv2.error: OpenCV(4.2.0) C:projectsopencv-pythonopencvmodulesimgprocsrccontours.cpp:197: error: (-210:Unsupported format or combination of formats) [Start]FindContours supports only CV_8UC1 images when mode != CV_RETR_FLOODFILL otherwise supports CV_32SC1 images only in function 'cvStartFindContours_Impl'

    Reply
  2. Hoàng Nam Nguyễn Cao says:
    2 years ago

    In this line: contours,hierachy = cv2.findContours(thres,cv2.RETR_TREE,cv2.CHAIN_APPROX_NONE). I have a probem ValueError: too many values to unpack (expected 2). Anybody can help me to solve this problem 🙁 Thanks anyway.

    Reply
  3. Tushant Verma says:
    2 years ago

    where is the explanation for the arguments in cv2.findcontour()?

    Reply
  4. Bar Lospalos says:
    2 years ago

    do you guys know where i can get that sample video (vtest.avi)? please help

    Reply
  5. Shashank Sharmadon says:
    2 years ago

    thanks bro…….

    Reply
  6. اشراق الدقامسة says:
    2 years ago

    Thank you for video, but i have error in imgrey line

    Reply
  7. Joao Vitor Tinti says:
    2 years ago

    I am from Brazil and the subtitles on your videos helps a lot to understand what you are saying

    Reply
  8. SHAHlisthenix says:
    2 years ago

    Thanks for the Wonderful tutorial!

    Reply
  9. maciej wozniak says:
    2 years ago

    Hi, thanks for the videos, really useful. However total number of conturs is 10 (the thresh val has to be higher than 127, eg 150, otherwise the green object is made as a background)

    Reply
  10. Imrul Hasan says:
    2 years ago

    Thanks for your important video SIr. But why the Green object is not rounded by lines? please have a look,

    Reply
  11. Charles Curt says:
    2 years ago

    So why didn't it detect the contour on the green part of the logo object?

    Reply
  12. pedram tehranchi says:
    2 years ago

    thank you so much

    Reply
  13. Mansi Pandya says:
    2 years ago

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    Reply
  14. Bro says:
    2 years ago

    I made an object detection model, now I want to draw a rectangle around the object, can I do it using cv2

    Reply
  15. Dharam Pal says:
    2 years ago

    Sir is your throat not well?

    Reply
  16. I know python says:
    2 years ago

    Great content mean opencv is really a powerful library of python …… It makes image recognition soo simple

    Reply
  17. ItsAdrish says:
    2 years ago

    Nice. I want to be a programmer like you. I'm from India and I'm 16.

    Reply

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