Image analysis – Applications – Personnel identification
Reexamination Certificate
2000-10-06
2004-07-13
Johnson, Timothy M. (Department: 2623)
Image analysis
Applications
Personnel identification
C382S257000, C382S258000, C382S259000, C382S260000, C382S263000, C382S264000, C382S274000
Reexamination Certificate
active
06763127
ABSTRACT:
FIELD OF INVENTION
Invention relates to fingerprint recognition and more particularly to fingerprint recognition where only a partial fingerprint is obtained.
BACKGROUND OF INVENTION
Conventional methods for fingerprint recognition rely on the center of the fingerprint whorl (cores) or the place where three different fingerprint ridge flows intersect (deltas) to align the test image with the reference image.
Prior art methods are inadequate where only a partial fingerprint is acquired.
Therefore, there is a need for a fingerprint recognition method that can extract useful fingerprint information when a partial fingerprint is acquired.
SUMMARY OF INVENTION
A method for fingerprint recognition comprises the steps of feature extraction and pattern recognition.
During feature extraction, an iterative gamma correction process using two available gamma curves are adopted to compensate the moisture effect of the fingerprint image. Dynamic thresholding and ridge flow extraction is applied to each 8×8 image block to assign intensity values and develop a directional map. Directional morphological filtering is applied to link the broken ridges.
During pattern recognition, an adaptive pattern alignment technique uses every minutia point on the fingerprint as a reference point for alignment.
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Baxes, Gregory A. ( Digital image processing: prinicples and applications / Gregory A. Baxes, TA1637. B39 1994).*
Costlow, Terry. “EEs Shake Hands with the Sweat Guy.” Electronic Engineering Times, Nov. 8, 1999, p. 153-154.
Quan, M. “Fingerprint ID System Gets Embedded.” Electronic Engineering Times, Nov. 29, 1999, p. 49-50.
Jen Hung-Min
Lin Shang-Hung
Bayat Ali
Fernandez Dennis S.
Fernandez & Associates LLP
IC Media Corporation
Johnson Timothy M.
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