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diff --git a/averagehist.py b/averagehist.py
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+# averagehist.py : average histogram for vapoursynth
+# author : ganymede
+# requirement : histogram
+
+class AverageHist():
+	"""Average histogram for vapoursynth."""
+	def __init__(self, core):
+		"""core : vapoursynth's core instance."""
+		self.core = core
+	
+	def get_hist(self, clip, mode):
+		"""Returns a cropped histogram."""
+		if mode == 'Levels':
+			clip = self.core.hist.Levels(clip)
+			clip = self.core.std.CropRel(clip, (clip.width - 256), 0, 0, (clip.height - 256) )
+		elif mode == 'Color':
+			clip = self.core.hist.Color(clip)
+			clip = self.core.std.CropRel(clip, (clip.width - 256), 0, 0, (clip.height - 256) )
+		elif mode == 'Color2':
+			clip = self.core.hist.Color2(clip)
+			clip = self.core.std.CropRel(clip, (clip.width - 256), 0, 0, (clip.height - 256) )
+		elif mode == 'Combined1':
+			c1 = self.core.hist.Levels(clip)
+			c1 = self.core.std.CropRel(c1, (c1.width - 256), 0, 0, (c1.height - 256) )
+			c2 = self.core.hist.Color2(clip)
+			c2 = self.core.std.CropRel(c2, (c2.width - 256), 0, 0, (c2.height - 256) )
+			clip = self.core.std.StackVertical([c1,c2])
+		elif mode == "Combined2":
+			c1 = self.core.hist.Levels(clip)
+			c1 = self.core.std.CropRel(c1, (c1.width - 256), 0, 0, (c1.height - 256) )
+			c2 = self.core.hist.Color2(clip)
+			c2 = self.core.std.CropRel(c2, (c2.width - 256), 0, 0, (c2.height - 256) )
+			c3 = self.core.hist.Classic(clip)
+			c3 = self.core.std.CropRel(c3, (c3.width - 256), 0, 0, 0 )
+			c4 = self.core.std.StackVertical([c1,c2])
+			if c3.height < c4.height:
+				c3 = self.core.std.AddBorders(c3, 0, 0, 0, (c4.height - c3.height), [0,128,128])
+			elif c3.height > c4.height:
+				c4 = self.core.std.AddBorders(c4, 0, 0, 0, (c3.height - c4.height), [0,128,128])
+			clip = self.core.std.StackHorizontal([c3,c4])
+		else:
+			clip = self.core.hist.Classic(clip)
+			clip = self.core.std.CropRel(clip, (clip.width - 256), 0, 0, 0 )
+		return clip
+
+	def get_average(self, clip, mode='Classic'):
+		"""mode can be one of 'Classic', 'Levels', 'Color', 'Color2', 'Combined1' or 'Combined2'."""
+		hist = self.get_hist(clip,mode)
+		average = hist[0]
+		for i in range(1, clip.num_frames):
+			average = self.core.std.Merge( [average, hist[i]], ( 1.0/(i+1) ) )
+		return average
+
+def usage():
+	msg = '''Usage :
+	import averagehist
+	AH = averagehist.AverageHist(core)
+	clip = AH.get_average(clip, mode='Classic')'''
+	print(msg)
+
+if __name__ == '__main__':
+	usage()
+