Hi everybody,

first of all, a happy to new year!

I am trying to extract GLCM features of my image but I don't understand the results. The GLCM output images are looking quite different, nevertheless that the source is quite similar.

I attached three example images and the corresponding GLCM output. I don't really understand why the second example has much brighter values then the other two images. Can anybody tell me what I am doing wrong?

Any help would be very appreciated,

thanks in advance,

Stefanie

Here is the code I used:

import cv2

import matplotlib.pyplot as plt

img = cv2.imread(crop_path + image, 0)

glcm_img = np.copy(img)

glcm_img[:] = 0

for i in range(glcm_img.shape[0]):

for j in range(glcm_img.shape[1]):

if i < 3 or j < 3:

continue

if i > (glcm_img.shape[0] - 4) or j > (glcm_img.shape[0] - 4):

continue

glcm_window = img[i - 3: i + 4, j - 3: j + 4]

glcm = greycomatrix(glcm_window, [1], [0], symmetric=True, normed=True)

contrast = greycoprops(glcm, 'dissimilarity')

glcm_img[i, j] = contrast

plt.imsave(glcm_path + image, glcm_img, cmap=plt.cm.gray)