/a/ in need of some dire help

Dear /prog/enitors.

We need your help.

Some idiot script kiddie has written a script that spams /a/ with the same image rotated by 90 degrees.  at the moment it is fucking the mods over because the content is changing therefore they cant ban by ip.

What im asking is for you guys to come up with a way to combat this spam.  Cheers

>>68
I was the OP, of that thread ^[1], actually.

Using hue, as suggested in >>67, doesn't really work -- you get massive clusterings of unrelated images when the image is primary white/black. A reasonable similiar-image detection system is IQDB^[2] which uses diffusion tensor analysis (or something that sounds like that).
                    
^{References:
[1] http://dis.4chan.org/read/prog/1209700628
[2] http://iqdb.hanyuu.net/code/}