import numpy as npimport cv2# Create a black imageimg = np.zeros((521,512,3), np.uint8)# Draw a diagonal blue line with thickness of 5 px# 背景数据，直线起点，直线终点，颜色，线条粗细img = cv2.line(img,(0,0),(511,511),(255,0,0),5)# print(img)# Drawing Rectangle# “背景（包含之前已经画到img的内容）”，矩形左上角，矩形右下角，颜色，线条粗细img = cv2.rectangle(img,(384,0),(510,128),(0,255,0),3)# Drawing Circle#背景数据；圆心；半径；颜色；LineType[-1代表选择纯色填充]img = cv2.circle(img,(447,63),63,(0,0,255),-1)# Drawing Ellipse# 背景；对称中心；长短轴长；整个椭圆旋转角度（顺时针）；# 起始角度位置；终止角度位置（顺）；颜色；LineTypeimg = cv2.ellipse(img,(256,256),(100,50),0,0,180,255,-1)# Drawing Polygonpts = np.array([[10,5],[20,30],[70,20],[50,10]],np.int32)pts = pts.reshape((-1,1,2))# polylines(img, pts, isClosed, color[, thickness[, lineType[, shift]]]) -> imgimg = cv2.polylines(img,[pts],True,(0,255,255))# Adding text to imagefont = cv2.FONT_HERSHEY_SIMPLEXcv2.putText(img,‘OpenCV‘,(10,500),font,4,(255,255,255),2,cv2.LINE_AA)cv2.imshow(‘images‘,img)cv2.waitKey(0)cv2.destroyAllWindows()