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eastmountyxz · web-flow · commit 1751cb9ad298 · 2021-02-07T20:58:07.000+08:00
diff --git a/blog37-histogram/blog37-11.py b/blog37-histogram/blog37-11.py
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+#coding:utf-8
+#By:Eastmount CSDN 2021-02-05
+import cv2  
+import numpy as np
+import matplotlib.pyplot as plt
+
+#读取图像
+img = cv2.imread('lena.bmp')
+
+#图像灰度转换
+grayImage = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+
+#二进制阈值化处理
+r, result = cv2.threshold(grayImage, 127, 255, cv2.THRESH_BINARY)
+
+#计算原图的直方图
+hist = cv2.calcHist([img], [0], None, [256], [0,256])
+
+#计算阈值化处理的直方图
+hist_res = cv2.calcHist([result], [0], None, [256], [0,256])
+
+#原始图像
+plt.figure(figsize=(8, 6))
+plt.subplot(221), plt.imshow(img, 'gray'), plt.title("(a)"), plt.axis('off')
+
+#绘制原始图像直方图
+plt.subplot(222), plt.plot(hist), plt.title("(b)"), plt.xlabel("x"), plt.ylabel("y")
+
+#阈值化处理后的图像
+plt.subplot(223), plt.imshow(result, 'gray'), plt.title("(c)"), plt.axis('off')
+
+#阈值化处理图像的直方图
+plt.subplot(224), plt.plot(hist_res), plt.title("(d)"), plt.xlabel("x"), plt.ylabel("y")
+plt.show()
