Computer vision course: find and draw contours in open CV 




import numpy as np

import cv2


img = cv2.imread('baseball.png')

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

ret, thresh = cv2.threshold(imgray, 127, 255, 0)

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

print("Number of contours = " + str(len(contours)))

print(contours[0])


cv2.drawContours(img, contours, -1, (0, 255, 0), 3)

cv2.drawContours(imgray, contours, -1, (0, 255, 0), 3)


cv2.imshow('Image', img)

cv2.imshow('Image GRAY', imgray)

cv2.waitKey(0)

cv2.destroyAllWindows()#close window

#===================================#

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