imagehasher.py 文件源码

def average_hash(self):
        try:
            image = self.image.resize((self.width, self.height), Image.ANTIALIAS).convert("L")
        except Exception as e:
            sys.exc_clear()
            print "average_hash error:", e
            return long(0)

        pixels = list(image.getdata())
        avg = sum(pixels) / len(pixels)

        def compare_value_to_avg(i):
            return ( 1 if i > avg else 0 )

        bitlist = map(compare_value_to_avg, pixels)

        # build up an int value from the bit list, one bit at a time
        def set_bit( x, (idx, val) ):
            return (x | (val << idx))