diff --git a/opendm/mesh.py b/opendm/mesh.py
index 34cc9874..f8bb51da 100644
--- a/opendm/mesh.py
+++ b/opendm/mesh.py
@@ -4,7 +4,7 @@ from opendm.dem import commands
 from opendm import system
 from opendm import log
 from opendm import context
-from scipy import signal, ndimage
+from scipy import signal
 import numpy as np
 
 def create_25dmesh(inPointCloud, outMesh, dsm_radius=0.07, dsm_resolution=0.05, depth=8, samples=1, maxVertexCount=100000, verbose=False, available_cores=None, method='gridded', smooth_dsm=True):
diff --git a/opendm/orthophoto.py b/opendm/orthophoto.py
index b4c635fd..fd81fdf5 100644
--- a/opendm/orthophoto.py
+++ b/opendm/orthophoto.py
@@ -7,7 +7,7 @@ import math
 import numpy as np
 import rasterio
 import fiona
-from scipy import ndimage
+from edt import edt
 from rasterio.transform import Affine, rowcol
 from rasterio.mask import mask
 from opendm import io
@@ -87,7 +87,7 @@ def compute_mask_raster(input_raster, vector_mask, output_raster, blend_distance
                 if out_image.shape[0] >= 4:
                     # alpha_band = rast.dataset_mask()
                     alpha_band = out_image[-1]
-                    dist_t = ndimage.distance_transform_edt(alpha_band)
+                    dist_t = edt(alpha_band, black_border=True, parallel=0)
                     dist_t[dist_t <= blend_distance] /= blend_distance
                     dist_t[dist_t > blend_distance] = 1
                     np.multiply(alpha_band, dist_t, out=alpha_band, casting="unsafe")
@@ -112,7 +112,7 @@ def feather_raster(input_raster, output_raster, blend_distance=20):
         if blend_distance > 0:
             if out_image.shape[0] >= 4:
                 alpha_band = out_image[-1]
-                dist_t = ndimage.distance_transform_edt(alpha_band)
+                dist_t = edt(alpha_band, black_border=True, parallel=0)
                 dist_t[dist_t <= blend_distance] /= blend_distance
                 dist_t[dist_t > blend_distance] = 1
                 np.multiply(alpha_band, dist_t, out=alpha_band, casting="unsafe")
diff --git a/requirements.txt b/requirements.txt
index 32fd2a95..d01f0a89 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,4 +25,5 @@ scikit-learn==0.20
 laspy==1.6.0
 beautifulsoup4==4.9.1
 lxml==4.5.1
-matplotlib==1.5.1
\ No newline at end of file
+matplotlib==1.5.1
+edt==2.0.1
\ No newline at end of file