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2019-10-13 18:35:34 -0600	commented answer	Error while working with contours it is, it helped me
2019-10-13 16:46:23 -0600	received badge	● Supporter (source)
2019-10-13 16:46:22 -0600	marked best answer	Error while working with contours when running this code import numpy as np import cv2 image=cv2.imread('screenshoot10.jpg') cv2.imshow('input image', image) gray=cv2.cvtColor(image,cv2.COLOR_BGR2GRAY) edged=cv2.Canny(gray,30,200) cv2.imshow('canny edges',edged) _, contours = cv2.findContours(edged,cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_NONE) cv2.imshow('canny edges after contouring', edged) print(contours) print('Numbers of contours found=' + str(len(contours))) cv2.drawContours(image,contours,-1,(0,255,0),3) cv2.imshow('contours',image) cv2.waitKey(0) cv2.destroyAllWindows() getting an error `OpenCV(4.1.1) C:\projects\opencv-python\opencv\modules\imgproc\src\drawing.cpp:2509: error: (-215:Assertion failed) npoints > 0 in function 'cv::drawContours'` what am I doing wrong?
2019-10-13 16:46:22 -0600	received badge	● Scholar (source)
2019-10-08 06:23:32 -0600	answered a question	video stream input from the screen with api So it is that opencv does not have the ability to capture a screen, but it can be implemented using mss, and I also saw
2019-10-08 06:23:32 -0600	asked a question	Error while working with contours Error while working with contours when running this code `import numpy as np import cv2 image=cv2.imread('screenshoot10
2019-10-08 06:23:31 -0600	asked a question	Error while working with contours Error while working with contours when running this code `import numpy as np import cv2 image=cv2.imread('screenshoot10
2019-06-21 08:22:53 -0600	asked a question	video stream input from the screen with api video stream input from the screen with api I need to get a video stream from the screen in real time to send it to the