Information hiding method and system based on dual-wavelength digital holographic coding

The invention discloses an information hiding method and system based on dual-wavelength digital holographic coding, and relates to the technical field of information hiding, and the method comprises the steps: converting to-be-hidden information into a binary image; generating a second visual secret key image from the first visual secret key image and the binary image by adopting a gray complementation algorithm of visual cryptography; the first visual key image is a scattering diagram with a set size; enabling the first visual key image and the second visual key image to pass through a dual-wavelength digital holographic system to generate a digital hologram; the dual-wavelength digital holographic system is built based on a Mach-Zehnder interference optical path; and attenuating the digital hologram and embedding the attenuated digital hologram into a host image to obtain a shared image. According to the invention, the security of visual information hiding is improved. 本发明公开一种基于双波长数字全息编码的信息隐藏方法及系统，涉及信息隐藏技术