#!/usr/bin/env python
# -*- coding: utf-8 -*-

import numpy as np
import cv2

src =np.ones((500,500),dtype=np.uint8)
for r in range(500):
    src[:, r] = (r / 500.0)*255

#设置127为全局阈值
# 二进制阈值处理
ret, th1 = cv2.threshold(src, 127, 255, cv2.THRESH_BINARY)
# 反二进制阈值处理
ret, th2 = cv2.threshold(src, 127, 255, cv2.THRESH_BINARY_INV)

ret, th3 = cv2.threshold(src, 127, 255, cv2.THRESH_TRUNC)
ret, th4 = cv2.threshold(src, 127, 255, cv2.THRESH_TOZERO)
ret, th5 = cv2.threshold(src, 127, 255, cv2.THRESH_TOZERO_INV)

# 为了输出图片
import sys
sys.path.append('..\\utils') 
import utils
utils.show_img([src,th1,th2,th3,th4,th5],["orignal","THRESH_BINARY","THRESH_BINARY_INV",
                "THRESH_TRUNC","THRESH_TOZERO","THRESH_TOZERO_INV"],"fig6-2.png")