Image analysis – Image transformation or preprocessing – Fourier transform
Reexamination Certificate
2006-06-06
2006-06-06
Bella, Matthew C. (Department: 2627)
Image analysis
Image transformation or preprocessing
Fourier transform
C348S222100, C348S254000, C382S124000, C382S192000, C382S218000
Reexamination Certificate
active
07058238
ABSTRACT:
A current frame portion (21) stores therein the most recent information of an image of those fingerprint images input from an inputted unit (1), while a previous frame portion (22) stores therein image information saved in the current frame portion (21). A pixel comparing portion (31) compares mutually corresponding pixel gray-level value information saved in the current frame portion (21) and the previous frame portion (22) respectively. A gray-level-value-changed pixels counting portion (32) counts the gray-level-value-increased pixels and the gray-level-value-decreased pixels based on the resultant information of that comparison of the pixel gray-level values. A pick-up timing deciding portion (33) utilizes the results obtained by the gray-level-value-changed pixels counting portion (32), to automatically detect a fingerprint image appropriate for matching in order to thus decide pick-up timing and also in order to output to an output unit (4) an appropriate fingerprint image based on the decision results.
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Bella Matthew C.
Desire Gregory
NEC Corporation
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