A Digital Watermarking Algorithm Based on Dual-tree Complex Wavelet Transform

Based on the good characteristics of dual-tree complex wavelet transform (DT-CWT), an improved digital watermarking algorithm is presented in the paper. The algorithm improves the embedding scheme by selecting the embedding channels and using the visual masking of HVS. In order to increase the robustness against common attacks such as JPEG, JPEG2000 compressions, different filtering attack etc., this algorithm uses the spread spectrum in embedding scheme and RS-Error correction code. The experimental results show that the algorithm increases the performance of watermark and has better robustness against common attacks. What´s more, it can apply to the local activity of image.