opencv_Drawing Functions

https://docs.opencv.org/3.0-beta/modules/imgproc/doc/drawing_functions.html

cv2.line()， cv2.circle()， cv2.rectangle()，cv2.ellipse()， cv2.putText()

• line
  cv2.line(img, pt1, pt2, color[, thickness[, lineType[, shift]]])

import numpy as np  import cv2  img=np.zeros((512,512,3),np.uint8)  cv2.line(img,(0,0),(512,512),(255,0,0),5)  cv2.imshow("shiyan",img)  cv2.waitKey(0)  cv2.destroyAllWindows()  

• circle
  cv2.circle(img, center, radius, color[, thickness[, lineType[, shift]]])

import numpy as np  import cv2  img=np.zeros((512,512,3),np.uint8)  cv2.circle(img,(447,63),63,(0,0,255),-1)  cv2.imshow("shiyan",img)  cv2.waitKey(0)  cv2.destroyAllWindows()  

• rectangle
  cv2.rectangle(img, pt1, pt2, color[, thickness[, lineType[, shift]]])

import numpy as np  import cv2  img=np.zeros((512,512,3),np.uint8)  cv2.rectangle(img,(384,0),(510,128),(0,255,0),3)  cv2.imshow("shiyan",img)  cv2.waitKey(0)  cv2.destroyAllWindows()  

• ellipse

import numpy as np  import cv2  img=np.zeros((512,512,3),np.uint8)  #cv2.ellipse(img,(256,256),(100,50),0,0,180,255,-1)  #cv2.ellipse(img,(256,256),(100,50),0,0,360,255,-1)  cv2.ellipse(img,(256,256),(100,50),0,0,0,255,-1)  cv2.imshow("shiyan",img)  cv2.waitKey(0)  cv2.destroyAllWindows()  

• putText
  cv2.putText(img, text, org, fontFace, fontScale, color[, thickness[, lineType[, bottomLeftOrigin]]])

import numpy as np  import cv2  img=np.zeros((512,512,3),np.uint8)  #cv2.ellipse(img,(256,256),(100,50),0,0,180,255,-1)  #cv2.ellipse(img,(256,256),(100,50),0,0,360,255,-1)  #cv2.ellipse(img,(256,256),(100,50),0,0,0,255,-1)  font=cv2.FONT_HERSHEY_SIMPLEX  cv2.putText(img,"opencv",(10,500),font,4,(255,255,255),2)  cv2.imshow("shiyan",img)  cv2.waitKey(0)  cv2.destroyAllWindows()