Data hiding in a hologram by modified digital halftoning techniques

Abstract

The objective of this research is to design a novel data hiding method for the dot-matrix hologram. The modified error diffusion techniques for addressing the halftone dots in six colors are proposed to make efficient use of the image area and to hide information. After outputting the encoded hologram, which is in analog format, an independent data recovery system is applied to capture the encoded holographic image and to extract the hidden information. The results show that it is feasible to hide data in a dot-matrix hologram. The method proposed in this research can achieve multiple security features for hologram in anti-counterfeiting applications.