clean up unused imports in contrib (#1806)

contrib/blender/common.py

@@ -1,5 +1,4 @@
 import bpy
-import materials_utils
 
 def loadMesh(file):
 

contrib/dem-blend/dem-blend.py

@@ -8,7 +8,6 @@ import sys
 sys.path.insert(0, os.path.join("..", "..", os.path.dirname(__file__)))
 
 import argparse
-import multiprocessing
 from opendm.dem import merge
 
 parser = argparse.ArgumentParser(description='Merge and blend DEMs using OpenDroneMap\'s approach.')

contrib/mask-duplicator/mask-duplicator.py

@@ -4,7 +4,7 @@ import os
 
 import PIL
 
-from PIL import Image, ExifTags
+from PIL import Image
 
 import shutil
 

contrib/orthorectify/orthorectify.py

@@ -12,7 +12,6 @@ import numpy as np
 import numpy.ma as ma
 import multiprocessing
 import argparse
-import functools
 from skimage.draw import line
 from opensfm import dataset