A method and apparatus extracts a foreground image and a background image from a color document image. The color document image is divided into a plurality of multiscaled grids. Each of the grids includes a plurality of blocks and the resolution of the plurality of blocks increases for each successive...http://www.google.com/patents/US5900953?utm_source=gb-gplus-sharePatent US5900953 - Method and apparatus for extracting a foreground image and a background image from a color document image
