error: (-215:Assertion failed) npoints > 0 in function ‘cv::drawContours‘
thresh_Contours=thresh.copy()cnts=cv.findContours(thresh_Contours,cv.RETR_EXTERNAL,cv.CHAIN_APPROX_SIMPLE)[1]cv.drawContours(thresh_Contours,cnts,-1,(0,0,0),3)cv_show('thresh_Contours',thresh_Contours