Prof. Dr. Masaaki Fujiyoshi

Academic Information Infrastructure Center, Tokyo Metropolitan University, Tokyo, Japan

Prof. Dr. Masaaki Fujiyoshi

Academic Information Infrastructure Center, Tokyo Metropolitan University, Tokyo, Japan

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Academic Career Length

57Years (1970-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 April 2007 in IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

Journal Article

Lossless Data Hiding in the Spatial Domain for High Quality Images

Hong Lin Jin

Masaaki Fujiyoshi

Hitoshi Kiya

3 August 2006

Conference Paper

Fast and Robust Identification Methods for JPEG Images with Various Compression Ratios

Fitri Arnia

I. Iizuka

Masaaki Fujiyoshi

H. Kiya

1 January 2005

Conference Paper

Generalized hierarchical encryption of JPEG 2000 codestreams for access control

Shoko Imaizumi

O. Watanabe

Masaaki Fujiyoshi

H. Kiya

This paper proposes an encryption scheme maintaining hierarchy of JPEG 2000 codestreams for flexible access control. JPEG 2000 generates hierarchical codestreams and has flexible scalability, such as, SNR, space, or color components. In a proposed method, only one managed key (master key) exists, and for a user permitted to access a reserved image quality, only one key generated by the master key is delivered. Also, a different key generated by the master key is delivered for a user permitted to access a different quality. The proposed access control method is available for all kinds of JPEG 2000 scalability. On the other hand, some conventional methods need several keys to control image quality. Another conventional method is not suitable for JPEG 2000 scalability.

1 January 2007

Conference Paper

A Location-Map Free Reversible Data Hiding Method using Block-Based Single Parameter

Masaaki Fujiyoshi

Shuji Sato

Hong Lin Jin

Hitoshi Kiya

This paper proposes a reversible data hiding method that embeds an L-level data sequence to images in the spatial domain. Though reversible data hiding once distorts the image to hide data into it, the distorted image is completely separated to the original image and the hidden data. The proposed method uses only one parameter to embed and extract data, and it extracts data without any location map. In addition, it can control embedding capacity according to payload for suppression of embedding distortion. Simulation results show the effectiveness of the proposed method.

1 July 2013

Conference Paper

Separable reversible data hiding in encrypted images with histogram permutation

Masaaki Fujiyoshi

This paper proposes a new method of separable reversible data hiding (RDH) for encrypted images in which hidden data can be extracted from an encrypted image conveying hidden data without image decryption. By histogram and spatial permutation, the proposed method firstly encrypts an image and simultaneously prepares room for RDH. Data are, then, hidden into the encrypted image by a RDH scheme based on histogram modification, and the encrypted image with hidden data is sent to a receiver. According to keys which the receiver has, he/she is allowed to take seven different actions, whereas the conventional method offers only three. This feature of the proposed method extends applicable scenarios. Moreover, the proposed method always recovers the original image, whereas the conventional method sometimes fails to do. Experimental results show the effectiveness of the proposed method.

27 July 2005

Conference Paper

Quantization-Based Image Steganography without Data Hiding Position Memorization

Y. Seki

H. Kobayashi

Masaaki Fujiyoshi

H. Kiya

About Me

Masaaki Fujiyoshi received the B.A., M.Eng., and Ph.D. degrees from Saitama University, Japan, in 1995, 1997, and 2001, respectively. In 2001, he joined Tokyo Metropolitan University, Japan, where he is currently a Professor at the Academic Information Infrastructure Center. His research interests include image and video media security, image and video processing and analysis, and media technology applications. Dr. Fujiyoshi is a Senior Member of the Institute of Electronics, Information and Communication Engineers (IEICE), Japan, and a member of the Institute of Image Information and Television Engineers (ITE), the Japan Society for Educational Technology (JSET), the IEEE, the European Association for Signal Processing (EURASIP), and the Asia-Pacific Signal and Information Processing Association (APSIPA). He was a co-recipient of the IEICE Best Paper Award and the ITE Katayanagi Best Paper Award. He has served as a Guest Editor for several special issues of IEICE Transactions on Fundamentals and IEICE Transactions on Information and Systems, and has been serving as an Associate Editor for IEICE Transactions on Information and Systems since 2024.

Prof. Dr. Masaaki Fujiyoshi

Prof. Dr. Masaaki Fujiyoshi

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