Image pick-up apparatus and image picking-up method
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United States of America Patent
Stats
-
Jun 6, 2006
Grant Date -
Jun 28, 2001
app pub date -
Dec 21, 2000
filing date -
Dec 22, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
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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