矩形包围框

import cv2
import numpy as np
o=cv2.imread('C:/Users/xpp/Desktop/coins.png')#原始图像
gray=cv2.cvtColor(o,cv2.COLOR_BGR2GRAY)#将彩色图片转换为灰度图片
ret,binary=cv2.threshold(gray,127,255,cv2.THRESH_BINARY)#将灰度图片转换为二值图片
contours,hierarchy=cv2.findContours(binary,cv2.RETR_LIST,cv2.CHAIN_APPROX_SIMPLE)#计算图像轮廓
n=len(contours)
contoursImg=[]
for i in range(n):
    temp=np.zeros(o.shape,np.uint8)
    contoursImg.append(temp)
x,y,w,h=cv2.boundingRect(contours[i])#计算矩形包围框
brcnt=np.array([[[x,y]],[[x+w,y]],[[x+w,y+h]],[[x,y+h]]])
o=cv2.drawContours(o,[brcnt],-1,(255,255,255),2)#绘制矩形包围框
print("顶点及长宽的点形式：")
print("x=",x)
print("y=",y)
print("w=",w)
print("h=",h)
rect=cv2.boundingRect(contours[i])
print("\n顶点及长宽的元组（tuple）形式：")
print("rect=",rect)
cv2.imshow("original",o)
cv2.waitKey()
cv2.destroyAllWindows()