A digital watermark scheme for vector graphics

Among the newly explored research areas of digital watermarking, various types of data embedding technologies for vector graphics have drawn more and more attention. The features of vector graphics on the data expression and use were analyzed. The requirements of watermarking for vector graphics are discussed. Utilizing the characteristics of vector graphics, an adaptive classification method is proposed, which is based on the number of vector graphics entities´ vertices. To embed digital watermark in the vector graphics by changing the statistical properties of different classification, this can be achieved by modifying the vertex value within an error tolerance. The extraction of watermark does not require the original vector graphics. Experiments show that this scheme has good transparency and robustness.