Hiroto Sawada, Shoko Imaizumi, and Hitoshi Kiya,
“FLRSP: privacy-preserving federated learning using randomly selected model parameters,”
APSIPA Trans. Signal Inf. Process., vol.15, no.1, August 2026.
Yusaku Kato and Shoko Imaizumi,
“Block-Distortion-Free Reversible Data Hiding in Encryption-then-Compression Images with Fully Flexible Access Privileges,”
Information, vol.17, no.492, May 2026.
Mare Hirose, Shoko Imaizumi, and Hitoshi Kiya,
“Learnable Image Encryption Without Key Management for Privacy-Preserving Vision Transformer,”
IEEE Access, vol.13, pp.201351-201362, November 2025.
Yan Zhang and Shoko Imaizumi,
“A Partial Image Processing Method with Full Reversibility for Smooth Boundary Representation,”
Bull. Soc. Photogr. Imag. Japan, vol.35, no.2, pp.9-18, November 2025.
Shuntaro Fukuoka, Shoko Imaizumi, and Minoru Kuribayashi,
“DNN Data Hiding for Transformer Encoder in ViT Models,”
Bull. Soc. Photogr. Imag. Japan, vol.34, no.2, pp.20-30, November 2024.
Haiwei Lin, Shoko Imaizumi, and Hitoshi Kiya,
“Privacy-Preserving ConvMixer Without Any Accuracy Degradation Using Compressible Encrypted Images,”
Information, vol.15, no.723, November 2024.
Mare Hirose, Shoko Imaizumi, and Hitoshi Kiya,
“Encryption Method for JPEG Bitstreams for Partially Disclosing Visual Information,”
Electronics, vol.13, no.2016, May 2024.
Daichi Nakaya and Shoko Imaizumi,
“An Extended Method for Reversible Color Tone Control Using Data Hiding,”
Electronics, vol.13, no.1204, March 2024.
Noa Kikuchi and Shoko Imaizumi,
“Reversible Data Hiding for OpenEXR Images in Compressible Encrypted Domain,”
Bull. Soc. Photogr. Imag. Japan, vol.34, no.1, pp.1-8, March 2024.
Ryota Motomura, Shoko Imaizumi, and Hitoshi Kiya,
“Reversible Data Hiding in Compressible Encrypted Images with Capacity Enhancement,”
APSIPA Trans. Signal Inf. Process., vol.12, no.1, July 2023.
Genki Hamano, Shoko Imaizumi, and Hitoshi Kiya,
“Effects of JPEG Compression on Vision Transformer Image Classification for Encryption-then-Compression Images,”
Sensors, vol.23, no.3400, March 2023.
Daichi Nakaya and Shoko Imaizumi,
“Security Enhancement for Reversible Data Hiding for Palette-Based Images,”
Bull. Soc. Photogr. Imag. Japan, vol.33, no.1, pp.1-6, March 2023.
日本写真学会論文賞
Yuki Sugimoto and Shoko Imaizumi,
“Reversible Image Processing for Color Images with Flexible Control,”
Appl. Sci., vol.13, no.2297, February 2023.
Ryota Motomura, Shoko Imaizumi, and Hitoshi Kiya,
“A Reversible Data Hiding Method with Prediction-Error Expansion in Compressible Encrypted Images,”
Appl. Sci., vol.12, no.9418, September 2022.
Hitoshi Kiya, Teru Nagamori, Shoko Imaizumi, and Sayaka Shiota,
“Privacy-Preserving Semantic Segmentation Using Vision Transformer,”
J. Imaging, vol.8, no.233, August 2022.
Eichi Arai and Shoko Imaizumi,
“High-Capacity Reversible Data Hiding in Encrypted Images with Flexible Restoration,”
J. Imaging, vol.8, no.176, June 2022.
Hitoshi Kiya, April Pyone Maung Maung, Yuma Kinoshita, Shoko Imaizumi, and Sayaka Shiota,
“An Overview of Compressible and Learnable Image Transformation with Secret Key and Its Applications,”
APSIPA Trans. Signal Inf. Process., vol.11, no.1, May 2022.
Yuki Sugimoto and Shoko Imaizumi,
“An Extension of Reversible Image Enhancement Processing for Saturation and Brightness Contrast,”
J. Imaging, vol.8, no.27, January 2022.
Ryota Motomura, Shoko Imaizumi, and Hitoshi Kiya,
“A Reversible Data Hiding Method in Encrypted Images for Controlling Trade-Off between Hiding Capacity and Compression Efficiency,”
J. Imaging, vol.7, no.268, December 2021.
上田美凪, 松田彩伽, 安川生馬, 今泉祥子,
“予測誤差拡大に基づくDepth画像の可逆情報埋込み法,”
電気学会論文誌C, vol.141, no.9, pp.1032-1038, 2021年9月.
Minagi Ueda and Shoko Imaizumi,
“Reversible Data Hiding Associated with Digital Halftoning That Allows Printing with Special Color Ink by Using Single Color Layer,”
IEEJ Trans. Electr. Inf. & Syst., vol.141, no.2, pp.163-164, February 2021.
Kotoko Hiraoka, Kensuke Fukumoto, Takashi Yamazoe, Norimichi Tsumura, Satoshi Kaneko, Wataru Arai, and Shoko Imaizumi,
“Application of Reversible Data Hiding for Printing with Special Color Inks to Preserve Compatibility with Normal Printing,”
IEEJ Trans. Electr. Inf. & Syst., vol.141, no.2, pp.155-162, February 2021.
Shoko Imaizumi, Yusuke Izawa, Ryoichi Hirasawa, and Hitoshi Kiya,
“A Reversible Data Hiding Method in Compressible Encrypted Images,”
IEICE Trans. Fundamentals, vol.E103-A, no.12, pp.1579-1588, December 2020.
Shoko Imaizumi and Hitoshi Kiya,
“A Block-Permutation-Based Encryption Scheme with Independent Processing of RGB Components,”
IEICE Trans. Inf. & Syst., vol.E101-D, no.12, pp.3150-3157, December 2018.
Anu Aryal, Shoko Imaizumi, Takahiko Horiuchi, and Hitoshi Kiya,
“Integrated Model of Image Protection Techniques,”
J. Imaging, vol.4, no.1, January 2018.
Shoko Imaizumi, Takeshi Ogasawara, and Hitoshi Kiya,
“Block-Permutation-Based Encryption Scheme with Enhanced Color Scrambling,”
Lect. Notes Comput. Sci., P. Sharma, F. Bianchi (Eds.), Springer-Verlag, vol.10269, pp.562-573, May 2017.
Kenta Kurihara, Shoko Imaizumi, Sayaka Shiota, and Hitoshi Kiya,
“An Encryption-then-Compression System for Lossless Image Compression Standards,”
IEICE Trans. Inf. & Syst., vol.E100-D, no.1, pp.52-56, January 2017.
Anu Aryal, Shoko Imaizumi, and Takahiko Horiuchi,
“Hierarchical Scrambling Method for Palette-Based Image Using Bitwise Operation,”
Bull. Soc. Photogr. Imag. Japan, vol.26, no.1, pp.1-9, June 2016.
Hiroyuki Kobayashi, Shoko Imaizumi, and Hitoshi Kiya,
“A Robust Identification Scheme for JPEG XR Images with Various Compression Ratios,”
Lect. Notes Comput. Sci., T. Bräunl, B. McCane, M. Rivera, and X. Yu (Eds.), Springer-Verlag, vol.9431, pp.38-50, February 2016.
Takeshi Ogasawara, Shoko Imaizumi, and Naokazu Aoki,
“Scalable Tamper Detection and Localization Scheme for JPEG2000 Codestreams,”
Lect. Notes Comput. Sci., Y. -S. Ho, J. Sang, Y. M. Ro, J. Kim, and F. Wu (Eds.), Springer-Verlag, vol.9315, pp.340-349, December 2015.
Kenta Kurihara, Masanori Kikuchi, Shoko Imaizumi, Sayaka Shiota, and Hitoshi Kiya,
“An Encryption-then-Compression System for JPEG / Motion JPEG Standard,”
IEICE Trans. Fundamentals, vol.E98-A, no.11, pp.2238-2245, November 2015.
Anu Aryal, Kazuma Motegi, Shoko Imaizumi, and Naokazu Aoki,
“Improvement of Multibit Information Embedding Algorithm for Palette-Based Images,”
Lect. Notes Comput. Sci., J. Lopez and C. J. Mitchell (Eds.), Springer-Verlag, vol.9290, pp.511-523, August 2015.
Shoko Imaizumi and Kei Ozawa,
“Palette-Based Image Steganography for High-Capacity Embedding,”
Bull. Soc. Photogr. Imag. Japan, vol.25, no.1, pp.7-11, June 2015.
Shoko Imaizumi and Kanichi Taniguchi,
“Hierarchical Image Authentication Based on Reversible Data Hiding,”
Bull. Soc. Photogr. Imag. Japan, vol.24, no.1, pp.1-5, June 2014.
日本写真学会論文賞
Shoko Imaizumi and Kei Ozawa,
“Multibit Embedding Algorithm for Steganography of Palette-Based Images,”
Lect. Notes Comput. Sci., R. Klette, M. Rivera, S. Satoh (Eds.), Springer-Verlag, vol.8333, pp.99-110, January 2014.
今泉祥子, 藤吉正明, 貴家仁志,
“低演算量鍵生成手法を用いたマルチメディアコンテンツの多重階層型アクセス制御方式,”
映像情報メディア学会学会誌, vol.66, no.2, pp.69-73, 2012年2月.
Shoko Imaizumi, Masaaki Fujiyoshi, Hitoshi Kiya, Naokazu Aoki, and Hiroyuki Kobayashi,
“A Key Derivation Scheme for Hierarchical Access Control to JPEG 2000 Coded Images,”
Lect. Notes Comput. Sci., Y. -S. Ho (Ed.), Springer-Verlag, vol.7088, pp.180-191, January 2012.
今泉祥子, 藤吉正明, 貴家仁志,
“再帰型ハッシュ連鎖を用いた暗号鍵生成方式と多次元階層的アクセス制御への適用,”
映像情報メディア学会学会誌, vol.65, no.2, pp.193-202, 2011年2月.
丹羽高柳賞論文賞受賞
今泉祥子, 阿部淑人, 藤吉正明, 貴家仁志,
“一方向性ハッシュ関数を用いたディジタル動画像の効果的アクセス制御方式,”
映像情報メディア学会学会誌, vol.64, no.11, pp.1621-1627, 2010年11月.
Shoko Imaizumi, Masaaki Fujiyoshi, and Hitoshi Kiya,
“An efficient access control method for composite multimedia content,”
IEICE Electronics Express, vol.7, no.20, pp.1534-1538, October 2010.
Masaaki Fujiyoshi, Shoko Imaizumi, and Hitoshi Kiya,
“Encryption of Composite Multimedia Contents for Access Control,”
IEICE Trans. Fundamentals, vol.E90-A, no.3, pp.590-596, March 2007.
貴家仁志, 今泉祥子, 渡邊修,
“マーカコードの発生を考慮したJPEG2000符号化画像の情報半開示法,”
電子情報通信学会論文誌, vol.J86-D-II, no.11, pp.1628-1636, 2003年11月.