引用本文: 孙鸿睿, 李光强, 朱建军, 施永胜. 改进的差值扩张和平移矢量地图可逆水印算法[J]. 武汉大学学报 ( 信息科学版), 2012, 37(8): 1004-1007.
SUN Hongrui, LI Guangqiang, ZHU Jianjun, SHI Yongsheng. Improved Reversible Watermarking Algorithm for Vector Map Based on Difference Expansion and Shifting[J]. Geomatics and Information Science of Wuhan University, 2012, 37(8): 1004-1007.
 Citation: SUN Hongrui, LI Guangqiang, ZHU Jianjun, SHI Yongsheng. Improved Reversible Watermarking Algorithm for Vector Map Based on Difference Expansion and Shifting[J]. Geomatics and Information Science of Wuhan University, 2012, 37(8): 1004-1007.

## Improved Reversible Watermarking Algorithm for Vector Map Based on Difference Expansion and Shifting

• 摘要: 在传统差值扩张水印算法的基础上,对水印嵌入和数据恢复公式进行了改进,无需计算顶点对之间的均值,即可在提取水印的同时,实现数据的完整恢复。仿真实验结果表明,与传统算法相比,改进的差值扩张和平移算法具有更大的嵌入容量和有效信息载荷,数据误差更可控,保密性更好。

Abstract: We improve traditional difference expansion algorithm by modifying the formulas in the embedding and data extracting procedure,it need not calculate the mean coordinate values of the vertex pairs,only need embed the coordinate value of the first point along with the payload.The experimental results show that the algorithm can recover the original maps from the watermarked ones and attract the embed watermark,and it is capable of hiding more secret at low map distortion and the data error is more controllable,and the data has better confidentiality.

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