Photosynth is an amazing new technology from Microsoft Live Labs that will change the way you think about digital photos forever.
Photosynth takes a large collection of photos of a place or object, analyzes them for similarities, and displays them in a reconstructed 3-Dimensional space.
With Photosynth you can:
Walk or fly through a scene to see photos from any angle.
Seamlessly zoom in or out of a photograph whether it’s megapixels or gigapixels in size.
See where pictures were taken in relation to one another.
Find similar photos to the one you’re currently viewing.
Explore a custom tour.
Send a collection to a friend.
Your brain knows that your eyes are about two inches apart. But when Photosynth does its magic, it doesn’t know where the cameras were, or which way they were pointing. Fortunately, when there are many cameras, and many features in common, the algorithms behind Photosynth can figure out not only where the features are in 3D, but where all of the cameras would have to have been, and which way they were aimed, consistent with the features they "saw".
The Photosynth client shows you the 3D pointcloud, but more importantly, it also shows you the original pictures overlaid on the model. Imagine a slide projector placed at each camera position, aimed where the camera was aiming, and projecting the picture that camera took. A screen is placed in the 3D environment at an appropriate distance from the projector. As you move around in the Photosynth environment, projectors turn on and off, giving you a changing perspective on a world built entirely out of the original photos.
Check it out here (http://labs.live.com/photosynth/)