Analysis of sharpness increase by image noise. - Takehito Kurihara; Naokazu Aoki; Hiroyuki Kobayashi (Human Vision and Electronic Imaging, 2009)

A Key Derivation Scheme for Hierarchical Access Control to JPEG 2000 Coded Images. - Shoko Imaizumi; Masaaki Fujiyoshi; Hitoshi Kiya; Naokazu Aoki; Hiroyuki Kobayashi (PSIVT (2), 2011)

Hierarchical Key Assignment Scheme for Multimedia Access Control with Modified Hash Chain. - Shoko Imaizumi; Naokazu Aoki; Hiroyuki Kobayashi; Hitoshi Kiya (IIH-MSP, 2012)

A visible data hiding scheme for printed color images. - Yuto Tobe; Shoko Imaizumi; Naokazu Aoki; Hiroyuki Kobayashi (ISPACS, 2012)

For Digitization of Photographic Books. - Yuri Ueno; Naokazu Aoki; Hiroyuki Kobayashi (Culture and Computing, 2013)

Memory texture as a mechanism of improvement in preference by adding noise. - Yinzhu Zhao; Naokazu Aoki; Hiroyuki Kobayashi (Human Vision and Electronic Imaging, 2014)

Hierarchical scrambling scheme for palette-based images. - Anu Aryal; Shoko Imaizumi; Naokazu Aoki (ISPACS, 2014)

Improvement in perception of image sharpness through the addition of noise and its relationship with memory texture. - Xiazi Wan; Hiroyuki Kobayashi; Naokazu Aoki (Human Vision and Electronic Imaging, 2015)

Improvement of Multi-bit Information Embedding Algorithm for Palette-Based Images. - Anu Aryal; Kazuma Motegi; Shoko Imaizumi; Naokazu Aoki (ISC, 2015)

Scalable Tamper Detection and Localization Scheme for JPEG2000 Codestreams. - Takeshi Ogasawara; Shoko Imaizumi; Naokazu Aoki (PCM (2), 2015)