Google has an image search engine where the input itself is an image, not text as has been customary even in Google itself.
The project is called "Goggles." It's intended for use with your mobile phone as you are out and about. If you, for example, see a bottle of wine, book, or work of art that you would like to know more about, snap a picture of it, submit it to Google and view the results. You can also use Goggles to get more information from a business using a business card. Or take a picture of a store on a street to find out what else is in the neighborhood.
You can find more information about Goggles at: