Get Image Contour Using cv2.findContours() in Python OpenCV

In this tutorial, we will introduce how to use python opencv cv2.findContours() to get image contour.

1.Read an image

import cv2
img = cv2.imread('py1.jpg')

2.Convert image to grayscale image

gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

3.Find the threshold

retval, thresh = cv2.threshold(gray_img, 127, 255, 0)
img_contours, _ = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

4.Draw the contours on the image using drawContours()

cv2.drawContours(img, img_contours, -1, (0, 255, 0))

5.Display image

cv2.imshow('Image Contours', img)
cv2.waitKey(0)

If you plan to detect the contour shape, you can read:

Cocyer