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diff --git a/tools/3D-Reconstruction/MotionEST/GroundTruth.py b/tools/3D-Reconstruction/MotionEST/GroundTruth.py
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+++ b/tools/3D-Reconstruction/MotionEST/GroundTruth.py
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+##  Copyright (c) 2020 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
+#coding : utf - 8
+import numpy as np
+import numpy.linalg as LA
+from MotionEST import MotionEST
+"""Ground Truth:
+
+  Load in ground truth motion field and mask
+"""
+
+
+class GroundTruth(MotionEST):
+  """constructor:
+
+    cur_f:current
+    frame ref_f:reference
+    frame blk_sz:block size
+    gt_path:ground truth motion field file path
+    """
+
+  def __init__(self, cur_f, ref_f, blk_sz, gt_path, mf=None, mask=None):
+    self.name = 'ground truth'
+    super(GroundTruth, self).__init__(cur_f, ref_f, blk_sz)
+    self.mask = np.zeros((self.num_row, self.num_col), dtype=bool)
+    if gt_path:
+      with open(gt_path) as gt_file:
+        lines = gt_file.readlines()
+        for i in xrange(len(lines)):
+          info = lines[i].split(';')
+          for j in xrange(len(info)):
+            x, y = info[j].split(',')
+            #-, - stands for nothing
+            if x == '-' or y == '-':
+              self.mask[i, -j - 1] = True
+              continue
+            #the order of original file is flipped on the x axis
+            self.mf[i, -j - 1] = np.array([float(y), -float(x)], dtype=int)
+    else:
+      self.mf = mf
+      self.mask = mask