# HG changeset patch
# User Nicolas Saunier <nico@confins.net>
# Date 1264905787 18000
# Node ID ca8e716cc231b6d9ed09b7b5e68270113df9a5f2
# Parent  9ae709a2e8d044a68606061d4bf2feceaa907047
added moving average filter

diff -r 9ae709a2e8d0 -r ca8e716cc231 python/utils.py
--- a/python/utils.py	Sat Jan 30 21:42:53 2010 -0500
+++ b/python/utils.py	Sat Jan 30 21:43:07 2010 -0500
@@ -49,6 +49,16 @@
 def crossProduct(l1, l2):
     return l1[0]*l2[1]-l1[1]*l2[0]
 
+def filterMovingWindow(input, halfWidth):
+    '''Returns an array obtained after the smoothing of the input by a moving average
+    The first and last points are copied from the original.'''
+    width = float(halfWidth*2+1)
+    win = ones(width,'d')
+    result = convolve(win/width,array(inputSignal),'same')
+    result[:halfWidth] = inputSignal[:halfWidth]
+    result[-halfWidth:] = inputSignal[-halfWidth:]
+    return result
+
 #########################
 # file I/O section
 #########################
@@ -113,35 +123,6 @@
     invH /= invH[2,2]
     return invH
 
-def project(homography, p):
-    '''Returns the coordinates of the projection of the point p
-    through homography'''
-    from numpy.core._dotblas import dot
-    from numpy.core.multiarray import array
-    from numpy.lib.function_base import insert
-    if (homography!=None) and (len(homography)>0):
-        pAugmented = insert(array(p), [2],[1], axis=0)
-        projected = dot(homography, pAugmented)
-        projected[0] /= projected[2]
-        projected[1] /= projected[2]
-    else:
-        projected = p
-    return projected[:2]
-
-def projectTrajectory(homography, trajectory):
-    '''Projects a series of points in the format
-    [[x1, x2, ...],
-    [y1, y2, ...]]
-
-    Warning: not optimized, calls project()'''
-    projected = [[],[]]
-    for x, y in zip(trajectory[0], trajectory[1]):
-        p = [x,y]
-        pp = project(homography, p)
-        projected[0].append(pp[0])
-        projected[1].append(pp[1])
-    return projected
-
 def plotPolygon(poly, options = ''):
     from numpy.core.multiarray import array
     from matplotlib.pyplot import plot