2019-01-13 17:48:21 -0500 received badge ● Notable Question (source) 2018-06-10 04:20:53 -0500 received badge ● Popular Question (source) 2016-12-19 05:21:01 -0500 received badge ● Student (source) 2014-04-06 23:11:24 -0500 received badge ● Scholar (source) 2014-04-05 08:59:05 -0500 asked a question Is it possible to draw half circle? Simple question. Is it possible to draw half circle in OpenCV? If not, how can I do this especially in Python? 2014-04-01 04:10:11 -0500 commented question iOS video Processing is slow,how can i run it in background? In my experience, using Haarcascade is slow. maybe you could try another algorithm. and see any differences. 2014-04-01 03:50:33 -0500 received badge ● Supporter (source) 2014-04-01 03:47:18 -0500 asked a question How can i get angle and line length in Python OpenCV I have a chunk of code to get start, end, far variable from Convexity Defects :  hull = cv2.convexHull(cnt,returnPoints = False) defects = cv2.convexityDefects(cnt,hull) for i in range(defects.shape[0]): s,e,f,d = defects[i,0] start = tuple(cnt[s][0]) end = tuple(cnt[e][0]) far = tuple(cnt[f][0]) cv2.line(res,far,end,[0,255,0],2) cv2.line(res,start,far,[0,255,0],2)  I need to dismissed convexity defect from finger if: line_length<0.4lbb and angle>80o So How can i get angle and line length value from those start, end, far variable? and dismissed convexity defect from given rule?