Here is an interesting new image processing technique. The authors have created an algorithm for stretching and compacting images while maintaining the important parts of the image by subtracting (or adding) the least complicated parts. The video is quite cool, especially the part at the end where people are removed from an image!
The paper has more examples (though I haven’t read it all the way through). I have directed the links via CoralCDN because the home site in Israel was loading very slowly, at least from Hawaii.