Low Power Block-Based Watermarking Algorithm

Yu-Ting PAI  Shanq-Jang RUAN  

IEICE TRANSACTIONS on Information and Systems   Vol.E89-D   No.4   pp.1507-1514
Publication Date: 2006/04/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e89-d.4.1507
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Application Information Security
digital watermark,  data hiding,  copyright protection,  low power,  discrete cosine transform,  

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In recent years, digital watermarking has become a popular technique for labeling digital images by hiding secret information which can protect the copyright. The goal of this paper is to develop a DCT-based watermarking algorithm for low power and high performance. Our energy-efficient technique focuses on reducing computation required on block-based permutation. Instead of using spacial coefficients proposed by Hsu and Wu's algorithm [1], we use DCT coefficients to pair blocks directly. The approach is implemented by C language and estimated power dissipation using Wattch toolset. The experimental results show that our approach not only reduces 99% energy consumption of pairing mechanism, but also increase the PSNR by 0.414 db for the best case. Moreover, the proposed approach is robust to a variety of signal distortions, such as JPEG, image cropping, sharpening, blurring, and intensity adjusting.