A low complexity secure force encryption based multiple image watermarking in NSCT domain

Wavelet domain image watermarking has gained popularity as it provides an adaptive way for embedding and recovery of image watermarks. Image watermarking is one of the important solution that deals with the multimedia security. To prove a better solution for image information security, a multiple image watermarking method in wavelet domain with SF (secure force) encryption has been proposed. The proposed work integrates NSCT (nonsubsampled contourlet transfrom), RDWT (redundant discrete wavelet transform), SVD (singular value decomposition)and SPIHT (set partitioning in hierarchical tree). For better security, a low complexity SF encryption technique has been used to encrypt the watermarked image. Shift invariance nature of RDWT and NSCT makes them more appropriate for watermarking. Analysis of the proposed method has been done with a number of standard cover images with multiple watermarks. Experiments have shown the effectiveness of the proposed algorithm over others quantitatively with different performance metrics.