Finding duplicated photo

[TheSaint]

Billy Mays wrote:

> It worked surprisingly well even
> with just the 64bit hash it produces.
> 
I'd say that comparing 2 images reduced upto 32x32 bit seems too little to 
find if one of the 2 portrait has a smile referred to the other.
I think it's about that mine and your suggestion are similar, but I'd like 
to scale pictures not less than 256x256 pixel.
Also to take a wider case which the comparison involve a rotated image.

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