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| 1 | 一种支持多版权的地理数据增量水印方法显示文摘目前地理数据水印方法有很多,但大都缺少对地理数据同步保护的考虑,同时没有在同步保护的基础上进行多版权水印嵌入的方法。分析了地理数据增量水印和多版权水印的问题,基于量化调制技术,提出了一种能兼顾增量水印和多版权水印的地理数据水印方法。该方法采用基于距离划分的策略,将特征点集划分成两个可重现的不相交子集,通过分别缩放两个子集嵌入双重水印,保证了所有顶点都只在精度范围内修改一次,使保真性得到控制。此外,缩放调制策略使地理数据形状尽可能得到保证。实验表明,该方法能满足增量水印和多版权水印的要求,同时具有很好的鲁棒性。 | 廖璋 熊胜超 彭智勇 彭煜玮 | 2015 | 计算机科学2015，42，7： | 0 |
| 2 | Assessment of distortion in watermarked geospatial vector data using different wavelets显示文摘With the rapid growth of the Internet,the copyright protection problem occurs frequently,and unauthorized copying and distributing of geospatial data threaten the investments of data producers.Digital watermarking is a possible solution to solve this issue.However,watermarking causes modifications in the original data resulting in distortion and affects accuracy,which is very important to geospatial vector data.This article provides distortion assessment of watermarked geospatial data using wavelet-based invisible watermarking.Eight wavelets at different wavelet decomposition levels are used for accuracy evaluation with the help of error measures such as maximum error and mean square error.Normalized correlation is used as a similarity index between original and extracted watermark.It is observed that the increase in the strength of embedding increases visual degradation.Haar wavelet outperforms the other wavelets,and the third wavelet decomposition level is proved to be optimal level for watermarking. | Sangita ZOPE-CHAUDHARI Parvatham VENKATACHALAM Krishna Mohan BUDDHIRAJU | 2015 | Geo-Spatial Information Science2015，18，2： | 0 |
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