A Time-Frequency Watermarking Algorithm Based on S Transformation Domain
In this paper, a robust image watermarking method in two-dimensional space/spatial-frequency distributions domain is proposed which is robust against geometric distortion. This watermarking is detected by a linear frequency change. The one-dimensional S transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of signals is resistant to all stationary filtering methods and exhibits geometrical symmetry. In the two dimensional Radon-Wigner transformation domain, the chirp signals used as watermarks change only its position in space/spatial-frequency distribution, after applying linear geometrical attack, such as scale rotation and cropping. But the two-dimensional Radon-Wigner transformation needs too much difficult computing. So the image is put into a series of ID signal by choosing scalable local time windows. The watermark embedded in the ID S transformation domains. The watermark thus generated is invisible and performs well in StirMark test and is robust to geometrical attacks. Compared with other watermarking algorithms, this algorithm is more robust, especially against geometric distortion, while having excellent frequency properties.
Digital watermarking S transform Geometrical attack
Deng Minghui Zeng Qingshuang Yu Song
School of Astronautics, Harbin Institute of Technology Department of Engineering,Northeast Agricultu School of Astronautics, Harbin Institute of Technology Harbin, China Department of Engineering, Northeast Agricultural University Harbin, China
国际会议
厦门
英文
517-520
2010-10-29（万方平台首次上网日期，不代表论文的发表时间）