Document watermarking scheme for information tracking

Abstract

A digital watermarking scheme for binary document image was proposed.First,a binary document image was segmented into individual characters.Then,based on the multiplicative transformation model,watermark was embedded by flipping the boundary points of each character.Moreover,a strategy is proposed for flipping the boundary points to ameliorate the visual imperceptibility of the watermarked image.Extensive experimental results show that the proposed scheme is effective to resist print-and-copy,it can achieve the purpose of hiding information in paper documents and can be used for information tracking.

Keywords

• information security;digital watermarking;binary document image;print-and-copy