关键词: 二维矢量地图, 数字水印, 精度测试, 鲁棒性, 相似度

Abstract: The vector digital watermark is one of the most important means of copyright protection for graphics and vector maps. The authors discussed a blind watermarking method for 2D vector map. First, the entire vector map was traversed to get the tolerance dynamically, then the classical Douglas-Peucker algorithm was used to get the entire feature nodes from vector map, and finally, the watermark was embedded into feature nodes in tolerance range. And with the inversed procedure of the embedding process, the watermark could be extracted. Through the attack method including random adding points, random deleting points, compression and cropping, the correlation coefficient of original watermark bits and the extracted watermark bits from attacked watermarked maps were calculated. The experimental results show that the proposed method has a great robustness.

Key words: 2D vector map, digital watermark, accuracy test, robustness, similarity