Research on Lossless Digital Watermarking Technology of Electronic Chart

Abstract

Taking S-57 standard electronic chart as the research subject, the paper introduces the technology of lossless digital watermarking. Based on an in-depth analysis of the content feature of the S-57 electronic chart, the lossless digital watermarking technology is concretized. A framework model of lossless digital watermarking based on the content feature of the electronic chart is put forward in the paper, as well as a zero-bit dynamical extension technology based on the gradient algorithm with which lossless embedding can be realized. At last, based on the experiment results and corresponding comparative analysis, the robustness, invisibility, lossless content and other aspects of the watermarking algorithm are compared and verified in detail. Meanwhile, the defects of the watermarking algorithm are also pointed out, paving the way for future research.