An Information Hiding Method in Presswork Based on Image Complexity and Template Matching
Cai Yin Wang, Jun Cai, Ming Jie Zhen · Applied Mechanics and Materials · 2013
This paper proposes an information hiding method in presswork based on image and complexity and template matching. First, the message to be hidden is coded by using BCH to facilitate the extraction of hidden information. Secondly, Based on appropriate image block partition, the local image complexity of the block is calculated, which is determined whether to embed watermark in this block. Watermark is embedded on the mid-frequency spectrum in DFT domain. Thirdly, two structural template lines are added in the polar coordinate system for detecting any combination of the geometrical distortions. Then, the hidden data can be extracted without using the original image. The experimental results indicate that the proposed method is robust after high-quality laser printing, offset printing and scanning.