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  1. import cv2
  2. import numpy
  3. img = cv2.imread('imgpp.png')
  4. grayImg = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
  5. blurImg = cv2.GaussianBlur(grayImg,(5,5),0)
  6.  
  7. #cv2.imshow('image',img)
  8. #cv2.waitKey(0)
  9.  
  10. cnts = cv2.findContours(blurImg, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)[0]
  11. cv2.drawContours(img, cnts,1,(255,0,0),3);
  12. print(len(cnts))
  13.    
  14. OpenCV Error: Assertion failed (npoints > 0) in cv::drawContours, file C:projectsopencv-pythonopencvmodulesimgprocsrcdrawing.cpp, line 2506
  15.     cv2.drawContours(img, cnts,1,(255,0,0),3);
  16. cv2.error: C:projectsopencv-pythonopencvmodulesimgprocsrcdrawing.cpp:2506: error: (-215) npoints > 0 in function cv::drawContours
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