# Python program to extract rectangular# Shape using OpenCV in Python3importcv2importnumpyasnpdrawing=False# true if mouse is pressedmode=True# if True, draw rectangle.ix,iy=-1,-1# mouse callback functiondefdraw_circle(event,x,y,flags,param):globalix,iy,drawing,modeifevent==cv2.EVENT_LBUTTONDOWN:drawing=Trueix,iy=x,yelifevent==cv2.EVENT_MOUSEMOVE:ifdrawing==True:ifmode==True:cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),3)a=xb=yifa!=x|b!=y:cv2.rectangle(img,(ix,iy),(x,y),(0,0,0),-1)else:cv2.circle(img,(x,y),5,(0,0,255),-1)elifevent==cv2.EVENT_LBUTTONUP:drawing=Falseifmode==True:cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),2)else:cv2.circle(img,(x,y),5,(0,0,255),-1)img=np.zeros((512,512,3),np.uint8)cv2.namedWindow('image')cv2.setMouseCallback('image',draw_circle)while(1):cv2.imshow('image',img)k=cv2.waitKey(1)&0xFFifk==ord('m'):mode=notmodeelifk==27:breakcv2.destroyAllWindows()

# Write Python code here# import the necessary packagesimportcv2importargparse# now let's initialize the list of reference pointref_point=[]crop=Falsedefshape_selection(event,x,y,flags,param):# grab references to the global variablesglobalref_point,crop# if the left mouse button was clicked, record the starting# (x, y) coordinates and indicate that cropping is being performedifevent==cv2.EVENT_LBUTTONDOWN:ref_point=[(x,y)]# check to see if the left mouse button was releasedelifevent==cv2.EVENT_LBUTTONUP:# record the ending (x, y) coordinates and indicate that# the cropping operation is finishedref_point.append((x,y))# draw a rectangle around the region of interestcv2.rectangle(image,ref_point[0],ref_point[1],(0,255,0),2)cv2.imshow("image",image)# construct the argument parser and parse the argumentsap=argparse.ArgumentParser()ap.add_argument("-i","--image",required=True,help="Path to the image")args=vars(ap.parse_args())# load the image, clone it, and setup the mouse callback functionimage=cv2.imread(args["image"])clone=image.copy()cv2.namedWindow("image")cv2.setMouseCallback("image",shape_selection)# keep looping until the 'q' key is pressedwhileTrue:# display the image and wait for a keypresscv2.imshow("image",image)key=cv2.waitKey(1)&0xFF# press 'r' to reset the windowifkey==ord("r"):image=clone.copy()# if the 'c' key is pressed, break from the loopelifkey==ord("c"):breakiflen(ref_point)==2:crop_img=clone[ref_point[0][1]:ref_point[1][1],ref_point[0][0]:ref_point[1][0]]cv2.imshow("crop_img",crop_img)cv2.waitKey(0)# close all open windowscv2.destroyAllWindows()