opencv入门6:蒙版

import numpy as np 
import argparse
import cv2

ap = argparse.ArgumentParser()
ap.add_argument("-i","--image",required =True, help="Path to the image")
args = vars(ap.parse_args())

image = cv2.imread(args["image"])
cv2.imshow("Original",image)

mask = np.zeros(image.shape[:2],dtype ="uint8")
(cx,cy) = (image.shape[1]//2,image.shape[0]//2)
cv2.rectangle(mask,(cx-250,cy-150),(cx+200 ,cy+150),255,-1)
cv2.imshow("Mask",mask)

masked = cv2.bitwise_and(image,image,mask=mask)

掩码只考虑掩码大于零的原始图像中的像素
cv2.imshow("Mask applied to image",masked)
cv2.waitKey(0)


mask = np.zeros(image.shape[:2], dtype = "uint8")
cv2.circle(mask, (cx, cy), 100, 255, -1)
masked = cv2.bitwise_and(image, image, mask = mask)
cv2.imshow("Mask", mask)
cv2.imshow("Mask Applied to Image", masked)
cv2.waitKey(0)