Python3与OpenCV3.3 图像处理(二十二）--对象测量（纯代码）

import cv2 as cv
import numpy as np

def measure_object(img):
    gray=cv.cvtColor(img,cv.COLOR_RGB2GRAY)
    ret,binary=cv.threshold(gray,0,255,cv.THRESH_BINARY_INV|cv.THRESH_OTSU)
    cv.imshow("binary img",binary)
    outImg,contours,hireachy=cv.findContours(binary,cv.RETR_EXTERNAL,cv.CHAIN_APPROX_SIMPLE)
    for i ,contour in enumerate(contours):
        #轮廓面积
        area=cv.contourArea(contour)
        #轮廓外接矩形面积
        area=cv.contourArea(contour)
        x,y,w,h=cv.boundingRect(contour)
        #几何矩
        mm=cv.moments(contour)
        cx=mm['m10']/mm['m00']
        cy=mm['m01']/mm['m00']
        cv.circle(img,(np.int(cx),np.int(cy)),3,(0,255,0),-1)
        cv.rectangle(img,(x,y),(x+w,y+h),(0,0,255),2)
    cv.imshow("mo",img)

src=cv.imread('num.jpg')
cv.imshow('def',src)
measure_object(src)
cv.waitKey(0)
cv.destroyAllWindows()