1
Rudolf Maarten Bolle, Sharathchandra Umapatirao Pankanti, Yi Sheng Yao: System and method for determining if a fingerprint image contains an image portion representing a partial fingerprint impression. International Business Machines Corporation, Louis J Perman & Green Percello, December 21, 1999: US06005963 (100 worldwide citation)

A fingerprint image is divided into blocks of pixels. The blocks are determined to be within the foreground or background of the image. Each of the foreground blocks are assigned a block direction. If an image consists of the complete impression of the fingerprint, there should exist at least one pa ...


2
Rudolf Maarten Bolle, Sharathchandra Umapatirao Pankanti, Yi Sheng Yao: System and method for determining the quality of fingerprint images. International Business Machines Corporation, Louis J Perman & Green Percello, October 5, 1999: US05963656 (51 worldwide citation)

A fingerprint image is divided into blocks of pixels. The blocks are marked as directional or non-directional. The blocks are also determined to be within the foreground or background of the image. Contiguous regions of blocks that are in the foreground and are directional are selected. The quality ...


3
Rudolf Maarten Bolle, Sharathchandra Umapatirao Pankanti, Yi Sheng Yao: System and method for determining if a fingerprint image contains an image portion representing a smudged fingerprint impression. International Business Machines Corporation, Louis J Percello, March 16, 1999: US05883971 (27 worldwide citation)

A fingerprint image is divided into blocks of pixels. The blocks are determined to be within the foreground or background of the image. Poor quality images are examined to determine if the imaging process is corrupted, e.g. by a wet finger, by determining if a smudginess measure is above a smudgines ...


4
Rudolf Maarten Bolle, Sharathchandra Umapatirao Pankanti, Yi Sheng Yao: System and method for determining if a fingerprint image contains an image portion representing a dry fingerprint impression. International Business Machines Corporation, Louis J Percello, November 30, 1999: US05995640 (10 worldwide citation)

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 ...