Multiwavelets in watermarking spectral images

摘要

A watermarking method for spectral images is proposed in this study. Multiwavelets are used in computing the transform domain of a spectral image. The visual, gray-scale watermark is transformed with the scalar wavelet transform and the transformed watermark is embedded in the three-dimensional transform domain of the spectral image. The strength of the watermark in embedding is controlled by perceptual constraints and the reconstruction quality. The experiments indicate, that the robustness of the proposed method against attacks like PCA/wavelet compression is better than in embedding in the transform domain obtained with the scalar wavelets.