and don't think that CBIR (Content Based Image Recogntion) research has stood still in the meantime, either - or that the technology used there was even probably particularly state of the art. I guess that for those purposes, a very quick and dirty algorithm to just notice when colours within a range for typical skin tone make up a substantial portion of the image, that's enough to notify an administrator who can make an informed decision.That basic technology is there already. I recall reading a few
years ago where employers were using software to catch their
workers who were surfing for porn - the adult variety. The
software could detect an abundance of naked flesh and sound the
alarm.
A quick google scholar search
http://scholar.google.com/scholar?q=cbir%20pornography&num=30&hl=en&lr=
shows that there are, indeed, several papers published recently on this topic of automatically spotting child pornography.
I'm absolutely not saying that that's a bad thing. Just that now is a time when the public needs to be conscious of what's going on, and the kinds of decisions that are being made about rights and privacy...
--
Peter