In many previous works, a cascaded phase-only mask (or phase-only hologram) architecture is designed for optical image encryption and watermarking. However, one such system usually cannot process multiple pairs of host images and hidden images in parallel. In our proposed scheme, multiple host images can be simultaneously input to the system and each corresponding output hidden image will be displayed in a non-overlap sub-region in the output imaging plane. Each input host image undergoes a different optical transform in an independent channel within the same system. The multiple cascaded phase masks (up to 25 layers or even more) in the system can be effectively optimized by a wavefront matching algorithm.
翻译:在许多先前的作品中,为光学图像加密和水标记设计了一个级联级级单级遮罩(或级单全息图)结构。然而,一个这样的系统通常无法平行处理多对主机图像和隐藏图像。在我们提议的方案中,多个主机图像可以同时输入到系统,每个相应的输出隐藏图像将在输出成像平面上的一个非重叠的分区中显示。每个输入主机图像在同一系统中的一个独立频道中经历不同的光学变换。系统中的多个级联式遮罩(高达25层甚至更多层)可以通过波头匹配算法有效优化。