SPIHT based dual watermarking technique in NSCT domain

This paper presents a dual watermarking scheme to improve the performance of discrete wavelet transforms (RDWT), non sub-sampled contourlet transform (NSCT)and singular value decomposition (SVD) based method. The method uses RDWT, NSCT, SVD and set partitioning in hierarchical tree (SPIHT) to provide better robustness, security, embedding capacity etc. In proposed scheme, the text watermark is embedded inside logo watermark to generatea dual watermark image. Further, dual watermark is embedded inside cover Lena image to produce watermarked image. Experimental results clearly revealed better performance of our technique against various attacks. Performance shows that this proposed method is more robust as compared to previous method.