A New Watermarking Algorithm of PDF Document Based on Correct Coding
Xingtong Liu · Computing Technology and Automation · 2009
Considering the structural feature of PDF document,we present a new high capacity and robust text watermarking algorithm.This algorithm makes use of the syntax and structural feature of PDF document to hide information and does not change any visual attributes of former document.TO insure the exclusiveness and randomicity of watermark,we extract the character eigenvectors of the document to create watermark.Futhermore,correct coding and cryptography can advance the robustness and security of watermark.Experiment indicates that this watermarking algorithm realizes perceptual transparency property,high capacity and robustness at the same time,harmonizing the inconsistency among perceptual transparency property,capacity and robustness.