| 2021 | MMSP | A Lossless Image Processing Method with Contrast and Saturation Enhancement. | Yuki Sugimoto, Shoko Imaizumi |
| 2015 | PSIVT | A Robust Identification Scheme for JPEG XR Images with Various Compression Ratios. | Hiroyuki Kobayashi, Shoko Imaizumi, Hitoshi Kiya |
| 2013 | ISCAS | A collusion-free key assignment scheme for hierarchical access control using recursive hash chains. | Shoko Imaizumi |
| 2013 | PSIVT | Multibit Embedding Algorithm for Steganography of Palette-Based Images. | Shoko Imaizumi, Kei Ozawa |
| 2011 | PSIVT | A Key Derivation Scheme for Hierarchical Access Control to JPEG 2000 Coded Images. | Shoko Imaizumi, Masaaki Fujiyoshi, Hitoshi Kiya, Naokazu Aoki, Hiroyuki Kobayashi |
| 2009 | ISCAS | Efficient Collusion Attack-free Access Control for Multidimensionally Hierarchical Scalability Content. | Shoko Imaizumi, Masaaki Fujiyoshi, Hitoshi Kiya |
| 2008 | ICIP | Hierarchical encryption using short encryption keys for scalable access control of JPEG 2000 coded images. | Noriaki Hashimoto, Shoko Imaizumi, Masaaki Fujiyoshi, Hitoshi Kiya |
| 2007 | ICIP | Collusion Attack-Resilient Hierarchical Encryption of JPEG 2000 Codestreams with Scalable Access Control. | Shoko Imaizumi, Masaaki Fujiyoshi, Yoshito Abe, Hitoshi Kiya |
| 2005 | ICIP | Generalized hierarchical encryption of JPEG 2000 codestreams for access control. | Shoko Imaizumi, Osamu Watanabe, Masaaki Fujiyoshi, Hitoshi Kiya |
| 2003 | ICIP | Partial-scrambling of images encoded using JPEG2000 without generating marker codes. | Hitoshi Kiya, Shoko Imaizumi, Osamu Watanabe |