From Google:
"... Search by Image returns the best results for images that have related content already on the web, so you’re more likely to get relevant results for distinctive landmarks or paintings than you will for more unique photos like your toddler’s latest finger painting. In addition to getting relevant results about your image, you can also find visually similar images or the same image in different sizes or resolutions.
Search by Image starts with the computer vision technology underlying Google Goggles, and adds new techniques and functionality that optimize the experience for desktop. The technology behind Search by Image analyzes your image to find its most distinctive points, lines and textures and creates a mathematical model. We match that model against billions of images in our index, and page analysis helps us derive a best guess text description of your image. Search by Image technology also includes the ability to match against images on the web so that we can show you similar images and webpages that contain your image ..."
Click here to read the whole article. Needless to say, this could add tremendous value to your investigations.
Enjoy.
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