Fingerprint identification device and method of using same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 30, 1999
Grant Date -
N/A
app pub date -
Mar 5, 1997
filing date -
Aug 26, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fingerprint identification device includes a fingerprint image pickup unit which receives reflected light from a light source to take a picture, and an in-block average luminance calculation unit which divides a fingerprint judging area into a plurality of blocks and calculates average luminance within the blocks according to a multivalued image signal from the fingerprint image pickup unit. A luminance deviation calculation and arrangement unit determines deviation between the in-block average luminance from the in-block average luminance calculation unit and the luminance of each picture element in the judging area to determine the number of picture elements corresponding to the deviation. A fingerprinting judging unit judges that fingerprinting has been made for the fingerprint image pickup unit when the number of picture elements within a prescribed range with the deviation near zero does not exceed a threshold for the number of picture elements corresponding to the deviation from the luminance deviation calculation and arrangement unit, and a fingerprint identification unite identifies the fingerprint based on the multivalued image signal from the fingerprint image pickup unit when the fingerprinting judging unit has judge the fingerprinting state.
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