Mr. Akihide Shiratsuki Profile

Akihide Shiratsuki

at Mitsubishi Electric Corp

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Author

Publications (2)

Proceedings Article | 29 May 2007 Paper

Optimization of illuminating system to detect optical properties inside a finger

Emiko Sano, Masahiro Shikai, Akihide Shiratsuki, Takuji Maeda, Masahito Matsushita, Koichi Sasakawa

Proceedings Volume 6356, 63560T (2007) https://doi.org/10.1117/12.736726

KEYWORDS: Sensors, Light sources, Image sensors, Skin, Transmittance, Image processing, Optical properties, Imaging devices, Biometrics, Data conversion

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Biometrics performs personal authentication using individual bodily features including fingerprints, faces, etc. These technologies have been studied and developed for many years. In particular, fingerprint authentication has evolved over many years, and fingerprinting is currently one of world's most established biometric authentication techniques. Not long ago this technique was only used for personal identification in criminal investigations and high-security facilities. In recent years, however, various biometric authentication techniques have appeared in everyday applications. Even though providing great convenience, they have also produced a number of technical issues concerning operation. Generally, fingerprint authentication is comprised of a number of component technologies: (1) sensing technology for detecting the fingerprint pattern; (2) image processing technology for converting the captured pattern into feature data that can be used for verification; (3) verification technology for comparing the feature data with a reference and determining whether it matches. Current fingerprint authentication issues, revealed in research results, originate with fingerprint sensing technology. Sensing methods for detecting a person's fingerprint pattern for image processing are particularly important because they impact overall fingerprint authentication performance. The following are the current problems concerning sensing methods that occur in some cases: Some fingers whose fingerprints used to be difficult to detect by conventional sensors. Fingerprint patterns are easily affected by the finger's surface condition, such noise as discontinuities and thin spots can appear in fingerprint patterns obtained from wrinkled finger, sweaty finger, and so on. To address these problems, we proposed a novel fingerprint sensor based on new scientific knowledge. A characteristic of this new method is that obtained fingerprint patterns are not easily affected by the finger's surface condition because it detects the fingerprint pattern inside the finger using transmitted light. We examined optimization of illumination system of this novel fingerprint sensor to detect contrasty fingerprint pattern from wide area and to improve image processing at (2).

Proceedings Article | 25 April 2005 Paper

Novel optical fingerprint sensor utilizing optical characteristics of skin tissue under fingerprints

Akihide Shiratsuki, Emiko Sano, Masahiro Shikai, Toshiro Nakashima, T. Takashima, Masato Ohmi, Masamitsu Haruna

Proceedings Volume 5686, (2005) https://doi.org/10.1117/12.590110

KEYWORDS: Sensors, Tissue optics, Skin, Optical coherence tomography, Natural surfaces, Transmittance, Glasses, Light emitting diodes, Tissues, Fiber optics

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