Fractal digital image synthesis and application in security holograms
Hanqiang Cao, Guangxi Zhu, Yaoting Zhu, Zhaoqun Zhang, Yulin Cao, Hongwei Ge, Xuan Li · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
Conventional method to generate a view angle combining rainbow hologram used a camera to record the sequence of pictures of an object. The object could be a model or a real object. It cost time and money. In recent years, computer-generated holograms have been investigated intensively because of their wide application range and their advantages in term of flexibility, accuracy, light weight and cost. In this paper, a new kind of fractal digital hologram is introduced. The fractal digital holograms are produced with the hyper-complex number model, the fractal hyper-texture model and the self-similar image model based on multi-scale Hurst parameters. The fractal digital holograms have been used in security holograms. In a security hologram, the more complex the model is, the more security the hologram has. The results indicate that fractal digital holograms have a good prospect for application in security holograms.