--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/rescale-homography.py	Mon Sep 02 23:46:31 2013 -0400
@@ -0,0 +1,32 @@
+#! /usr/bin/env python
+
+import sys
+
+import matplotlib.pyplot as plt
+import numpy as np
+import cv2
+
+import cvutils
+import utils
+
+if len(sys.argv) < 4:
+   print('Usage: {} homography_filename original_size new_size (size can be width or height)'.format(sys.argv[0]))
+   sys.exit()
+
+homography = np.loadtxt(sys.argv[1])
+
+imgPoints = np.array([[10,10],
+                      [10,20],
+                      [20,20],
+                      [20,10]])
+
+wldPoints = cvutils.projectArray(homography, imgPoints.T).T
+
+newSize = float(sys.argv[3])
+originalSize = float(sys.argv[2])
+imgPoints = imgPoints*newSize/originalSize
+
+newHomography, mask = cv2.findHomography(imgPoints, wldPoints)
+
+np.savetxt(sys.argv[1]+'.new', newHomography)
+