diff --git a/imgrate.py b/imgrate.py
index ba68dd5..dbb0af5 100755
--- a/imgrate.py
+++ b/imgrate.py
@@ -1,11 +1,20 @@
 #!/usr/bin/env python3
 import cv2
+import numpy as np
 from argparse import ArgumentParser
 
 
 def laplacian_variance(image):
-    grayscale = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
-    return cv2.Laplacian(grayscale, cv2.CV_64F).var()
+    return cv2.Laplacian(image, cv2.CV_64F).var()
+
+
+def fdibm(image):
+    F = np.fft.fft2(image)
+    Fcentered = np.fft.fftshift(F)
+    Fabs = np.abs(Fcentered)
+    Fmax = Fabs.max()
+    Th = np.count_nonzero(Fabs > Fmax/1000)
+    return Th / (F.shape[0] * F.shape[1])
 
 
 if __name__ == '__main__':
@@ -14,5 +23,6 @@ if __name__ == '__main__':
     args = ap.parse_args()
 
     image = cv2.imread(args.images[0])
+    grayscale = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
 
-    print(laplacian_variance(image))
\ No newline at end of file
+    print(fdibm(grayscale))
\ No newline at end of file