Previous [ 1] [ 2] [ 3] [ 4] [ 5] [ 6] [ 7] [ 8] [ 9] [ 10] [ 11] [ 12] [ 13] [ 14] [ 15] [ 16] [ 17] [ 18] [ 19]

@

Journal of Information Science and Engineering, Vol. 25 No. 6, pp. 1723-1736 (November 2009)

A Blind Image Watermarking Based on Dual Detector*

CHIN-PAN HUANG1, CHI-JEN LIAO2 AND CHAUR-HEH HSIEH1
1Department of Computer and Communication Engineering
Ming Chuan University
Taoyuan, 333 Taiwan
2Department of Information Engineering
I-Shou University
Kaohsiung, 840 Taiwan

This paper presents a blind image watermarking technique based on a novel detection scheme which contains two detectors aiming at the positive attack and negative attack, respectively. The analysis on signal processing attack indicates that there exist unreliable transformed coefficients in the attacked image which result in errors of the extraction of watermark data. The novel detection scheme removes the unreliable transformed coefficients and employs the remaining reliable coefficients for the extraction of embedded watermark. The experimental results indicate the proposed technique improves robustness significantly, as compared to the existing single detector scheme.

Keywords: image watermarking, attacks, discrete cosine transform, robustness, dual detector

Full Text () Retrieve PDF document (200911_05.pdf)

Received February 26, 2008; revised June 9 & August 4, 2008; accepted August 22, 2008.
Communicated by H. Y. Mark Liao.
* This paper was partially supported by the National Science Council of Taiwan, R.O.C., No. NSC 92-2213-E- 214-009.