DWT-Based Image Watermarking for Copyright Protection

Abstract

Abstract.A discrete wavelet transform (DWT)-based image watermarking algorithm is proposed, where the original image is not required for watermark extracting, is embedded watermarks into the DC area while preserving good fidelity and is achieved by inserting the watermark in subimages obtained through subsampling. Experimental results demonstrate that the proposed watermarking is robust to various attacks.

Copyright Protection of Images by reversible, invisible, and robust Digital Watermarking using 3rd and 4th Level Discrete Wavelet Transform

“…Digital media can be stored, duplicated and distributed without loss of fidelity unlike analog media [1]. Digital content that have been used in a network environment are easy to be duplicated, so enforcement of digital copyright protection is an important issue [2]. Digital watermarking solves the problem of copyright protection by watermark embedding in digital data, such as image [3].…”

“…Many researchers in different fields are now using digital watermarking technique in various applications [21]. In past and in recent years many algorithms or schemes have been introduced for copyright protection of images [1][2][3][4][5][6][22][23][24][25][26][27]. Among which few are unable to recover the original image after embedding the watermark i.e the image get distorted during extraction of watermark [6].…”

Crypto-SVD based robust and protected digital image watermarking in discrete wavelet transform domain

“…4) It should be resistant to lossy data compression. 5) It should be resistant to various common operations of image processing [3] . An image watermarking scheme can be classified into two domains: spatial domain and transform domain.…”

“…Sukalyan Som et al [9] proposed a scheme in which DWT based watermark is embedded in multiple region to perform well against critical tampering situations. Ho Seok Moon et al [3] proposed a scheme in which DWT coefficient of two sub image is compared by four DWT sub image. Inducement of this scheme is to develop a watermarking scheme where the original image is not required during extraction of watermark.…”