A new incremental watermarking based on dual-tree complex wavelet transform

This paper proposes a new incremental watermarking technique, which is robust for affine transformation and time-varying according to the degree of distortion, using Dual-Tree Complex Wavelet Transform (DT-CWT). At the embedding step, the proposed algorithm inserts a given watermark into the phase components of a transformed image by DT-CWT. At the extracting step, the algorithm incrementally compares the extracted with the original watermark using correlation from lowest to highest level. The proposed technique through performance evaluation displays that it was more robust in geometric distortions than a conventional CWT-based watermarking.