Add: Distance measure

src/helper.py

@@ -7,3 +7,17 @@ def pil_cv2_image_converter(image):
     # that the color is converted from RGB to BGR format.
     opencv_image = cv2.cvtColor(numpy_image, cv2.COLOR_RGB2BGR)
     return opencv_image
+
+def chi2_distance(histA, histB, eps = 1e-10):
+  # compute the chi-squared distance
+  d = 0.5 * np.sum([((a - b) ** 2) / (a + b + eps)
+    for (a, b) in zip(histA, histB)])
+         # return the chi-squared distance
+  return d
+
+def euclidean_distance(x, y):
+    # compute the Euclidean distance
+    d = np.sqrt(np.sum((x - y) ** 2))
+    # return the Euclidean distance
+    return d
+