In a first exemplary embodiment of the present invention, an automated, computerized method for manipulating an image is provided. The method of the present invention comprises the steps of selecting matched shadow/lit pairs of image portions from each of separate, different materials depicted in the...http://www.google.com/patents/US7672537?utm_source=gb-gplus-sharePatent US7672537 - Method and system for improved detection of material reflectances in an image
