Realization of information communication environment with high security
and high reliability
[1] Optical biometric recognition systems
| Information security, especially the recognition system with high speed
and high accuracy, is very important in high information-oriented society.
Individual recognition using the biological information, such as fingerprint,
vein pattern inside a fingertip, iris, etc., has recently been increasing
everywhere, for example, at the ATMs of banks, in the automatic logging into PCs and smartphones,
etc. In our laboratory, the recognition system by optical information processing
composed of laser light, lens, etc., has been being studied to realize the individual recognition
with high speed and high accuracy. The following figure shows the schematic diagram of an optical
frequency correlator we proposed. |
[2] Encryption and processing of image information
| In high information-orientated society,
the encryption technology of information is requisite for keeping
reliability and security, especially personal information, in various information services.
In our laboratory, new methods of encryption and processing of image information
with high security and high speed have been being studied. The following
right-hand side figure shows an example of the processed image of the fingerprint
shown in the following left-hand side figure by use of the discrete
fractional Fourier transform (DFRT). |
The following figure shows a prototype of the image encryption
and processing system using the optical fractional Fourier transform (FRT). The optical FRTs
can be realized by adjusting the focal length of a liquid lens and by adjusting the positions of
the input and output planes and the lens by use of automatic controlled stages.
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In our laboratory, researches on the individual recognition systems with
high accuracy using iris, electrocardiogram (ECG) waveform, etc., have also been
being studied. In addition,
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[3] Fake fingerprint detection
[4] Holographic particle sizing using Wigner-Ville distribution
[5] Tweet analysis: extracion of spam accounts, concept of urban space, etc.
are also being studied.
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