This one is hard to explain without watching the YouTube video over at Creative Bits: Content Aware Image Resizing

The video is a demonstration/presentation from the annual SIGGRAPH (Special Interest Group on GRAPHics and Interactive Techniques) Conference. In short, the video demonstrates computer algorithms which allow an image to be resized horizontally or vertically non-proportionally, without distorting the image. Elements are “reshuffled” inside the image to keep the same basic look of the visual information.

Very interesting.