How to identify nude images? (or something similar?)

I've done some research and so far haven't found anything very helpful. My question is what technology can I use to identify at least most nude images, etc. when being upload from users to my site and not allow them t开发者_开发知识库o be posted? From what I understand, there isn't anything "perfect" of course but I would like to get a good start with something half decent verses nothing at all what-so-ever. Any suggestions, links, or helpful bits of information are greatly appreciated!

You could make a histogram of the images and check for the amount of skin-tone-ish pixels.

I would go the route of building your own.

Here is a good project that has helped me in my first attempts at image recognition

http://www.codeproject.com/KB/cs/BackPropagationNeuralNet.aspx

There has been a lot of success with writing tools that look for nude images. Generally speaking, they look for certain amounts of skin-tone and/or shapes. Those will flag potential images for human review.

good luck!