A fingerprint image is divided into blocks of pixels. The blocks are also determined to be within the foreground or background of the image. A dryness process determines a mean intensity of pixels within each foreground block, a second mean intensity of pixels for those pixels whose intensities are smaller...http://www.google.ca/patents/US5995640?utm_source=gb-gplus-sharePatent US5995640 - System and method for determining if a fingerprint image contains an image portion representing a dry fingerprint impression
