python opencv 二值化 计算白色像素点的实例
贴部分代码
#! /usr/bin/env python
# -*- coding: utf-8 -*-
import cv2
import numpy as np
from PIL import Image
area = 0
def ostu(img):
global area
image=cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) # 转灰度
blur = cv2.GaussianBlur(image,(5,5),0) # 阈值一定要设为 0 ！高斯模糊
ret3,th3 = cv2.threshold(blur,0,255,cv2.THRESH_BINARY+cv2.THRESH_OTSU) # 二值化 0 = black ; 1 = white
# cv2.imshow('image', th3)
# a = cv2.waitKey(0)
# print a
height, width = th3.shape
for i in range(height):
for j in range(width):
if th3[i, j] == 255:
area += 1
return area
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