Python PIL aHash implementation.

aHash.py

import Image

img = Image.open("lenna.png")
img = img.resize((8, 8))
img = img.convert('L')

pixels = img.load()

avg = 0
result = 0

for y in range(8):
	for x in range(8):
		avg += pixels[x, y]

avg = avg / 64

for y in range(8):
	for x in range(8):
		result = (result << 1) | 1 if pixels[x, y] <= avg else result << 1

print("Hash: %x" % result)