Protection of Digital Image Based on Wavelet Transform

Abstract

In this paper a Robust Watermarking algorithm using wavelet transform is presented. Protection of digital multimedia content has become an increasingly important issue for content owners and service providers. As watermarking is identified as a major technology to achieve copyright protection, the Discrete Wavelet Transform (DWT) is commonly used in recent watermarking schemes because of its growing popularity. In a DWT based scheme, the DWT coefficients are modified with the data that represents the watermark. Modification in all frequencies allows the development of a watermarking scheme that is robust to a wide range of attacks. The proposed method embeds a binary pattern in the form of an image in the HH band at the first level of Discrete Wavelet Transform. The present study suggests a bi-orthogonal wavelet watermarking. The performance of the proposed watermarking algorithm is robust to a variety of attacks.