Robust Watermarking Scheme Based on Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT) for Copyright Protection of Digital Images

被引：0

作者：

Ahire, Vijaya K. ^{[1
]}

Kshirsagar, Vivek ^{[2
]}

机构：

[1] Dr BAM Univ, MGMs Jawaharlal Nehru Engn Coll, Aurangabad, Maharashtra, India

[2] Dr BAM Univ, Govt Engn Coll, Aurangabad, Maharashtra, India

来源：

INTERNATIONAL JOURNAL OF COMPUTER SCIENCE AND NETWORK SECURITY | 2011年 / 11卷 / 08期

关键词：

Watermarking; Robustness; imperceptibility; Blind watermarking; Spatial Domain; Transform Domain; Discrete Wavelet Transform (DWT); Discrete Cosine transform ( DCT); Arnold cat map Peek signal to noise ratio; Normalized correlation;

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

In this paper robustness of image watermarking algorithm in transform domain using combined DWT-DCT is evaluated. Host image is decomposed up to 3-levels using discrete wavelet transform. DCT transform of selected DWT sub band coefficients blocks are computed. Binary Watermark is embedded in the DCT transform of each selected DWT sub-band. For embedding watermark bits corresponding random number sequence is added in the middle frequency coefficients of the DCT block. To extract the watermark same procedures as the embedding process is used. Correlation between mid-band coefficients and random-sequences is calculated to determine watermarked bits. The implementation of algorithm shows good imperceptibility and higher robustness against common signal processing attacks.

引用

页码：208 / 213

页数：6