In ensuring the content of digital vector maps lossless, a high capacity digital watermarking algorithm is proposed based on encoding scheme. According to the structure of TAB file for digital vector maps, the watermark is hidden into the attribute blocks. As each vector object definition reserves redundant space, these information bits cannot be edited and displayed by any map editing tool, the watermark has good concealment. Experimental results show that the algorithm maintaining high capacity and good invisibility, it also can strongly resist various geometric transformations such as cropping, rotation, projection, etc..
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.
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