python-opencv-cv2.threshold()二值化函数的使用

import cv2
import numpy as np
# 读取照片
img=cv2.imread('D:\\Patrick_Star.jpg')
# 图像缩放
img = cv2.resize(img,None,fx=0.1,fy=0.1)
cv2.imshow('img',img))
# 灰度处理
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.imshow('gray',gray)
# cv2.threshold()二值化
_,thres = cv2.threshold(gray, 180, 255, cv2.THRESH_BINARY_INV)
cv2.imshow('thres',thres)
# 展示图片
cv2.waiTKEy(0)
cv2.destroyAllwindows()