Using Google’s search by image feature to return similar images
http://images.google.com/imghp?hl=en
With Google you can search by image. But it gets really interesting when you upload an image that is not available on the internet and look at the set of similar images returned. Or if you use a common image but just view the visually similar results. For example, here is a protein molecule (http://www.kurzweilai.net/images/ferritin.jpg)
Here are similar image results returned by Google.
You can also restrict the results to faces:
A few internet images to try:
- http://www.kurzweilai.net/images/cancer-to-bone-featured.jpg
- http://alien-ufo-research.com/reptilians/picture-of-reptilian-alien.gif
Camera images (not on the Internet until they were posted here) These will give more interesting results. For example, the woman with the flower (using face matching) returns images of Erik Prince and Brad Pitt.