python全局图像二值化

import cv2 as cv
import numpy as np
 
 
def load_image():
    src=cv.imread('num.jpg')
    h,w=src.shape[:2]
    #src=cv.resize(src,(w*2,h*3))
    return src
#全局阈值
def threshold_demo(image):
    gray=cv.cvtColor(image,cv.COLOR_BGR2GRAY)
    #为0则使用自动寻找阈值的选项 使用自动寻找即用|分开。
    ret,binary=cv.threshold(gray,127,255,cv.THRESH_BINARY)#|cv.THRESH_TRIANGLE
    print(ret)
    cv.imshow('same_3',binary)
    cv.waitKey(0)
    cv.destroyAllWindows()
 
threshold_demo(load_image())