NDLI: LPM-based RST invariant digital image watermarking

Content Provider	IEEE Xplore Digital Library
Author	Zheng, D. Zhao, J.
Copyright Year	2003
Description	Author affiliation: Multimedia Commun. Lab., Ottawa Univ., Ont., Canada (Zheng, D.; Zhao, J.)
Abstract	Based on log-polar mapping (LPM), this paper presents a novel digital image watermarking scheme that is invariant to rotation, scaling, and translation (RST). We embed watermark in the log-polar mapping (LPM) of the Fourier magnitude spectrum of original image to simplify the effects of RST transformations into simple shifts. For watermark embedding, the approximate ILPM is employed to replace ILPM, in order to eliminate the imprecision caused by ILPM. Therefore actually watermarks are embedded in the Fourier magnitude spectrum of the original image, to achieve the effect of being embedded in LPM domain. Watermark extraction does not need original image, we use exhaustive search in the embedding area to handle the shift of watermark positions in LPM domain caused by rotation and scaling in spatial domain. The scheme avoids computing inverse log-polar mapping (ILPM) to preserve the image quality. Evaluations demonstrate that the scheme is invariant to rotation and translation, sufficiently invariant to scaling transformation, and very robust to JPEG compression and other attacks.
Starting Page	1951
Ending Page	1954
File Size	402857
Page Count	4
File Format	PDF
ISBN	0780377818
ISSN	08407789
DOI	10.1109/CCECE.2003.1226296
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-04
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital images Watermarking Discrete Fourier transforms Fourier transforms Robustness Multimedia communication Information technology Image quality Protection Embedded computing
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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