实现了3种算法提取云量

cloudage.py

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+import datetime, math, os, sys, logging
+import cv2
+import numpy as np
+
+
+def f1(image_path):
+    # Load an image
+    img = cv2.imread(image_path)
+    # img = cv2.imread(image_path, 0)  # Load an image in grayscale
+
+    b, g, r = cv2.split(img)
+    cloud = r / b
+
+    ret, cloud_BINARY = cv2.threshold(cloud, 0.6, 255, cv2.THRESH_BINARY)  # 文献中推荐阈值为0.6
+    cloudage = cloud_BINARY.sum() / (cloud_BINARY.size * 255)
+
+    print("r/b算法，云量为%f\n" % cloudage)
+
+    tmp = image_path.split('.')
+    out = tmp[0] + "_r_b." + tmp[1]
+    cv2.imwrite(out, cloud_BINARY)
+
+    # cv2.imshow('image', cloud_BINARY)
+    cv2.waitKey(0)
+    cv2.destroyAllWindows()
+
+
+def f2(image_path):
+    img = cv2.imread(image_path)
+
+    b, g, r = cv2.split(img)
+    cloud = (b-r) / (b+r)
+
+    ret, cloud_BINARY = cv2.threshold(cloud, 0.2, 255, cv2.THRESH_BINARY_INV)
+    cloudage = cloud_BINARY.sum() / (cloud_BINARY.size * 255)
+
+    print("(b-r) / (b+r)算法，云量为%f\n" % cloudage)
+
+    tmp = image_path.split('.')
+    out = tmp[0] + "_(b-r)_(b+r)." + tmp[1]
+    cv2.imwrite(out, cloud_BINARY)
+
+    # cv2.imshow('image', cloud_BINARY)
+    cv2.waitKey(0)
+    cv2.destroyAllWindows()
+
+
+def f3(image_path):
+    img = cv2.imread(image_path)
+    b, g, r = cv2.split(img)
+
+    # # 转到HSV空间
+    # hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
+    # h, s, v = cv2.split(hsv)
+
+    # 转到HLS空间
+    hls = cv2.cvtColor(img, cv2.COLOR_BGR2HLS)  # 这就是ihs颜色空间：
+    h, l, s = cv2.split(hls)
+
+    μ_Clouds = 12.7
+    σ_Clouds = 3.7
+
+    μ_sky = 45.3
+    σ_sky = 4.4
+
+    # np.where用法：https://www.zhihu.com/question/62844162
+    clouds_loc = np.where(s < μ_Clouds + 3 * σ_Clouds)  # 厚云
+    sky_loc = np.where(s > μ_sky - 3 * σ_sky)  # 天空
+    unknow_loc = np.where((μ_Clouds + 3 * σ_Clouds <= s) & (s <= μ_sky - 3 * σ_sky))  # 薄云
+
+    s[sky_loc] = 1
+    s[clouds_loc] = 2
+    s[unknow_loc] = 3
+
+    tmp = image_path.split('.')
+    out = tmp[0] + "_saturation." + tmp[1]
+    cv2.imwrite(out, s)
+
+    # cv2.imshow('image', cloud_BINARY)
+    cv2.waitKey(0)
+    cv2.destroyAllWindows()
+
+
+if __name__ == '__main__':
+    image_path = r'D:\PycharmProjects\cloudage\photo\photo7.jpg'
+    # image_path = r'D:\PycharmProjects\cloudage\photo\cloud1_perfect.jpg'  # f3全为天空
+    f1(image_path)
+    f2(image_path)
+    f3(image_path)