Study and overview of combined NSCT-DCT digital image watermarking

Abstract

The authenticity of content is crucial factors for solving the problem of copying, distributing and Modifying, the intellectual properties in an illegal way. Watermarking can resolve this problem of above properties. In this paper considering a robust image Watermarking technique by using Nonsub sampled contourlet transform (NSCT) and discrete Cosine transform (DCT). This is called hybrid watermarking. A new embedding algorithm (NEA) of digital watermarking is proposed in this paper. With the help of Cox's additive embedding algorithm and the NEA for additive white Gaussian noise (AWGN) attack and without attack. simulation results are compared. Both algorithms use the hybrid watermarking. multimedia data that is digital video exchanged through the internet require to provide protection to enhance security commercial activity and media on the internet. In this water marking technique Apply 3 Level NSCT to input image firstly, and then perform DCT on Low freq subband. for inverse transform process to get a watermark image by Appling embedding Equation later. This digital watermarking method shows that it is more robust, imperceptible and higher capacity than others' when applying to various experiments on image.