A New Robust Digital Image Watermarking Based on Wavelet Moments
基于小波矩的抗几何攻击数字图像水印算法研究

In image watermarking, the watermark robustness to geometric transformations is still an open question. Using invariant image features to carry the watermark is an effective approach to address this problem. In this paper, a geometrically robust image watermarking algorithm using image normalization and wavelet moments is proposed. The geometrically invariant space is constructed by using image normalization. Some wavelet moments of the normalized image are selected, and their magnitudes are dither-modulated to embed the digital watermark. The watermarked image is obtained via reconstruction from the modified moments. Simulation results show that the hidden message can be decoded at low error rates, robust against image rotation, scaling and translation, and as well, a variety of other distortions such as lossy compression.