# -*- coding: utf-8 -*-# 阈值操作import cv2import numpy as npfrom matplotlib import pyplot as pltimg = cv2.imread('../../../datas/images/fish.jpg')ret,thresh1 = cv2.threshold(img,127,255,cv2.THRESH_BINARY)ret,thresh2 = cv2.threshold(img,125,255,cv2.THRESH_BINARY_INV)ret,thresh2 = cv2.threshold(img,127,255,cv2.THRESH_BINARY_INV)ret,thresh3 = cv2.threshold(img,127,255,cv2.THRESH_TRUNC)ret,thresh4 = cv2.threshold(img,127,255,cv2.THRESH_TOZERO)ret,thresh5 = cv2.threshold(img,127,255,cv2.THRESH_TOZERO_INV)titles = ['Original Image','BINARY','BINARY_INV','TRUNC','TOZERO','TOZERO_INV']images = [img, thresh1, thresh2, thresh3, thresh4, thresh5]for i in range(6):    plt.subplot(2,3,i+1),plt.imshow(images[i],'gray')    plt.title(titles[i])    plt.xticks([]),plt.yticks([])plt.show()