Add files via upload

eastmountyxz · web-flow · commit f41b63b64a49 · 2021-02-07T21:07:03.000+08:00
diff --git a/blog37-histogram/blog37-13.py b/blog37-histogram/blog37-13.py
@@ -0,0 +1,48 @@
+#coding:utf-8
+#By:Eastmount CSDN 2021-02-05
+import cv2  
+import numpy as np
+import matplotlib.pyplot as plt
+
+#函数: 获取图像的灰度平均值
+def fun_mean(img, height, width):
+    sum_img = 0
+    for i in range(height):
+        for j in range(width):
+            sum_img = sum_img + int(img[i,j])
+    mean = sum_img / (height * width)
+    return mean
+
+#函数: 获取中位数
+def fun_median(data):
+    length = len(data)
+    data.sort()
+    if (length % 2)== 1: 
+        z = length // 2
+        y = data[z]
+    else:
+        y = (int(data[length//2]) + int(data[length//2-1])) / 2
+    return y
+
+#读取图像
+img = cv2.imread('lena.bmp')
+
+#图像灰度转换
+grayImage = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+
+#获取图像高度和宽度
+height = grayImage.shape[0]
+width = grayImage.shape[1]
+
+#计算图像的灰度平均值
+mean = fun_mean(grayImage, height, width)
+print("灰度平均值：", mean)
+
+#计算图像的灰度中位数
+value = grayImage.ravel() #获取所有像素值
+median = fun_median(value)
+print("灰度中值：", median)
+
+#计算图像的灰度标准差
+std = np.std(value, ddof = 1)
+print("灰度标准差", std)
