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On each page I will have a 1 pixel image that has a link going to a ban user page. On this page I will store the users IP address in a database and anytime that the IP address tries to access my site for a 7 day period will receive a message saying that they have been banned. Since my site is completely dynamic I can do this relatively easily. By using a 1 pixel image it should prevent normal users from clicking it. Also I would put nofollow in the tag so legitimate SE spiders should not visit that page.
My question is will Google think that the 1 pixel image is black hat and penalize me? Also are there any other pitfalls that I might not be thinking of?