3-D DWT based multiple watermarking algorithm for spectral images

In this paper, we propose the multiple watermarking algorithm for spectral 3-D (3 Dimensional) images in the D WT (Discrete Wavelet Transform) domain. Haar wavelet based 3-D D WT is applied on spectral image. Eigen values of Dual binary watermarks are embedded in the mid frequency band, which are multiplied with appropriate strength factor. 3-D ID WT (Inverse D WT) is applied on the modified subbands to obtain the watermarked image. During extraction process, dual binary watermarks are reconstructed from the test image. An experimental result shows that the proposed algorithm produces very high imperceptibility and robustness against various types of attacks like rotation, addition of noise etc.