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On Monday, the company showed off a technology that, for a subset of images it's found on the Web, can identify similar photos. The technology works by "computing the visual distance" between two images then finding the nearest neighbors in the image database, said Radhika Malpani, the Google director of engineering who presides over image search work.

Google added a number of interesting features to Google Image search lately, including the ability to filter pictures by style and color. Now, this new Google Labs project can also find similar images. New feature should make it easier to find just the right image for you.

So for example you need to search for "Paris" so it will show on images which having the Meta tag "Paris" here you will able to see images for beautiful city of Paris and also able to see images for celebrity Paris Hilton. Now you only need to see the images for City of Paris so just click to the link below the photo you like, which says " Similar Images". After doing this you will able to see the similar set of images for your choice of image. and it works perfectly. It also means that you can find other images also, for example if you search for "Ice Age" then in "similar images" result you can find the all cartoon characters of the movie

works great ! !

Google is also working on a more sophisticated understanding though, for example through face recognition in Picasa Web Albums.