Copyright Protection for GIS Vector Map Based on Wavelet Transform

The copyright of GIS vector map has become an increasingly complex topic. The main technologies which are used for copyright protection are the copyright marking techniques, and these techniques are delegated by watermarking. In this paper, a new watermarking algorithm for GIS vector map is presented. The magnitude of the DWT coefficients of vertices extracted from the map is altered to embed the watermark. The selection of the hiding coefficients will be depended on the threshold value, and a key used to select the exact locations which embed the watermark. The watermark bits are embedded in coefficients which should satisfy certain conditions. The Insertion of the watermark in these selected coefficients is done by changing the specific bits of the coefficients like spatial domain. The watermarks can be blindly detected without the original map and watermark information. The experimental results demonstrate the high robustness of the proposed algorithm to various attacks like noise additions etc, and by evaluating the quality of the watermarked map via the WPSNR with respect to the original map, we show that the watermarked map is very similar to the original map, which indicates that the proposed watermarking scheme can achieve a better tradeoff between the robustness and the transparency. The copyright of GIS vector map has become an increasingly complex topic. The main technologies which are used for copyright protection are the copyright marking techniques, and these techniques are delegated by watermarking. In this paper, a new watermarking algorithm for GIS vector map is... Iqbal, Sajid, Rauf, Azhar, Javed, Huma, Ahmad, Shabir // Proceedings of the International Conference on Information Manag,2011, p214 Publishing data over the internet has greatly facilitated the ways of data transfer and file sharing but opened new threats of piracy and copyright violations. The technique of relational database watermarking is used to protect digital assets by embedding imperceptible watermarks into the data... Aborawi, Zahra Aborawi, Ghalwash, Atef Zaki, El_Haggar, Nahla // Egyptian Computer Science Journal,2013, Vol. 37 Issue 6, p53 A novel digital watermarking method is presented, for maps' polygons, for embedding two watermarks in LSB (Least Significant Bit) of an angle and a side of a polygon, using random tables. One of the challenges that faced watermarking technique is that angles and distances are not changed easily... A geographical information services (GIS) can be provided on the basis of a digital map, which is the fundamental form of representation of data in a GIS. Because the process of producing a digital map is considerably complex and the maintenance of a digital map requires substantial monetary and... With the rapid development of GIS and computer techniques, vector map data has been widely used in many fields. Since the production of map data is very costly, illegal copying will result in huge loss for data owners. In order to protect the copyright of vector data, digital watermarking has... With the application of large scale even global scale geospatial data, the multi-scale representation of global vector data on sphere becomes very important. In order to represent the multi-scale global vector data efficiently and accurately, a real-time global vector data simplification method... Watermarking appraisement is the key technology for validity checking of the digital watermark algorithm. There is any comprehensive evaluation method proposed for watermarking technology oriented electronic chart. Sometimes, traditional software and testing theory can only give some... Kothamasu, K. K., Sehagal, V. K. // International Journal of Advanced Research in Computer Science,Jan/Feb2012, Vol. 3 Issue 1, p216 Due to high speed computer networks, the use of digitally formatted data has increased many folds. The digital data can be duplicated and edited with great ease which has led to a need for effective copyright protection tools. With the growth of the Internet, unauthorized copying and... Authentication and copyright protection for digital contents over the Internet can be achieved through digital watermarking. The major components of the Internet are textual contents. Hence protection of plain text documents requires more attention. In this paper, we propose an invisible... Development of New Cardiac Deformity Indexes for Pectus Excavatum on Computed Tomography: Feasibility for Pre- and Post-Operative Evaluation. Source.


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