title: Embedding of computer-generated hologram in a dithered image.
abstract: We have developed an encryption method using a computer-generated hologram (CGH) embedded in a dithered image. First, confidential information is converted into a CGH. Next, the CGH data undergo two separate dithering processes in parallel: one corresponding to CGH white pixels and one corresponding to CGH black pixels. The results from both processes are used to form a dither matrix for creating the final dithered and encoded image. In this way, confidential information can be embedded into the image. The confidential information can be extracted using a technique similar to CGH optical reconstruction.
authors.affiliation: School of Science and Technology, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, 214-8571, Japan. tanaken@isc.meiji.ac.jp
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Tanaka