Halftone Image Processing Method of Security Based on Moiré Effect

A halftone image processing method of security based on moiré effect is developed in this paper. On the theoretical basis of moiré effect and information hiding in halftone images, some images and text information are hidden in the pre-copy color images, and then the images are output by means of laser printers and traditional printing proof. The experimental results show that when the specific detecting film is in the right angle and position, the hidden graphic information can be clearly observed. This security method is of better effect, lower production costs, which can be widely used in packaging security printing.