diff --git a/page_dewarp.py b/page_dewarp.py
index 6ef5b33..88e2791 100755
--- a/page_dewarp.py
+++ b/page_dewarp.py
@@ -446,7 +446,7 @@ def get_contours(name, small, pagemask, masktype):
 
     mask = get_mask(name, small, pagemask, masktype)
 
-    _, contours, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL,
+    contours,_ = cv2.findContours(mask, cv2.RETR_EXTERNAL,
                                       cv2.CHAIN_APPROX_NONE)
 
     contours_out = []
@@ -554,7 +554,7 @@ def sample_spans(shape, spans):
             xmin, ymin = cinfo.rect[:2]
 
             step = SPAN_PX_PER_STEP
-            start = ((len(means)-1) % step) / 2
+            start = int(((len(means)-1) % step) / 2)
 
             contour_points += [(x+xmin, means[x]+ymin)
                                for x in range(start, len(means), step)]
@@ -736,20 +736,20 @@ def objective(pvec):
         ppts = project_keypoints(pvec, keypoint_index)
         return np.sum((dstpoints - ppts)**2)
 
-    print '  initial objective is', objective(params)
+    print( '  initial objective is', objective(params))
 
     if DEBUG_LEVEL >= 1:
         projpts = project_keypoints(params, keypoint_index)
         display = draw_correspondences(small, dstpoints, projpts)
         debug_show(name, 4, 'keypoints before', display)
 
-    print '  optimizing', len(params), 'parameters...'
+    print( '  optimizing', len(params), 'parameters...')
     start = datetime.datetime.now()
     res = scipy.optimize.minimize(objective, params,
                                   method='Powell')
     end = datetime.datetime.now()
-    print '  optimization took', round((end-start).total_seconds(), 2), 'sec.'
-    print '  final objective is', res.fun
+    print( '  optimization took', round((end-start).total_seconds(), 2), 'sec.')
+    print( '  final objective is', res.fun)
     params = res.x
 
     if DEBUG_LEVEL >= 1:
@@ -773,7 +773,7 @@ def objective(dims):
     res = scipy.optimize.minimize(objective, dims, method='Powell')
     dims = res.x
 
-    print '  got page dims', dims[0], 'x', dims[1]
+    print( '  got page dims', dims[0], 'x', dims[1])
 
     return dims
 
@@ -786,7 +786,7 @@ def remap_image(name, img, small, page_dims, params):
     width = round_nearest_multiple(height * page_dims[0] / page_dims[1],
                                    REMAP_DECIMATE)
 
-    print '  output will be {}x{}'.format(width, height)
+    print( '  output will be {}x{}'.format(width, height))
 
     height_small = height / REMAP_DECIMATE
     width_small = width / REMAP_DECIMATE
@@ -841,7 +841,7 @@ def remap_image(name, img, small, page_dims, params):
 def main():
 
     if len(sys.argv) < 2:
-        print 'usage:', sys.argv[0], 'IMAGE1 [IMAGE2 ...]'
+        print( 'usage:', sys.argv[0], 'IMAGE1 [IMAGE2 ...]')
         sys.exit(0)
 
     if DEBUG_LEVEL > 0 and DEBUG_OUTPUT != 'file':
@@ -856,8 +856,8 @@ def main():
         basename = os.path.basename(imgfile)
         name, _ = os.path.splitext(basename)
 
-        print 'loaded', basename, 'with size', imgsize(img),
-        print 'and resized to', imgsize(small)
+        print( 'loaded', basename, 'with size', imgsize(img),)
+        print( 'and resized to', imgsize(small))
 
         if DEBUG_LEVEL >= 3:
             debug_show(name, 0.0, 'original', small)
@@ -868,20 +868,20 @@ def main():
         spans = assemble_spans(name, small, pagemask, cinfo_list)
 
         if len(spans) < 3:
-            print '  detecting lines because only', len(spans), 'text spans'
+            print( '  detecting lines because only', len(spans), 'text spans')
             cinfo_list = get_contours(name, small, pagemask, 'line')
             spans2 = assemble_spans(name, small, pagemask, cinfo_list)
             if len(spans2) > len(spans):
                 spans = spans2
 
         if len(spans) < 1:
-            print 'skipping', name, 'because only', len(spans), 'spans'
+            print( 'skipping', name, 'because only', len(spans), 'spans')
             continue
 
         span_points = sample_spans(small.shape, spans)
 
-        print '  got', len(spans), 'spans',
-        print 'with', sum([len(pts) for pts in span_points]), 'points.'
+        print( '  got', len(spans), 'spans',)
+        print( 'with', sum([len(pts) for pts in span_points]), 'points.')
 
         corners, ycoords, xcoords = keypoints_from_samples(name, small,
                                                            pagemask,
@@ -904,11 +904,11 @@ def main():
 
         outfiles.append(outfile)
 
-        print '  wrote', outfile
-        print
+        print( '  wrote', outfile)
+        print()
 
-    print 'to convert to PDF (requires ImageMagick):'
-    print '  convert -compress Group4 ' + ' '.join(outfiles) + ' output.pdf'
+    print( 'to convert to PDF (requires ImageMagick):')
+    print( '  convert -compress Group4 ' + ' '.join(outfiles) + ' output.pdf')
 
 
 if __name__ == '__main__':
diff --git a/requirements.txt b/requirements.txt
index c03f9c9..3ff7e8d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
-page_dewarp
 numpy
 scipy
-Image
-cv2>=3.0
+Pillow
+opencv-python
\ No newline at end of file