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An Improved Image Watermarking based on LPM and AQIM

by Somanath Chikane, Sukhwinder K. Bhatia, Rajneesh Talwar
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International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Volume 134 - Number 8
Year of Publication: 2016
Authors: Somanath Chikane, Sukhwinder K. Bhatia, Rajneesh Talwar
10.5120/ijca2016907959

Somanath Chikane, Sukhwinder K. Bhatia, Rajneesh Talwar . An Improved Image Watermarking based on LPM and AQIM. International Journal of Computer Applications. 134, 8 ( January 2016), 22-27. DOI=10.5120/ijca2016907959

@article{ 10.5120/ijca2016907959,
author = { Somanath Chikane, Sukhwinder K. Bhatia, Rajneesh Talwar },
title = { An Improved Image Watermarking based on LPM and AQIM },
journal = { International Journal of Computer Applications },
issue_date = { January 2016 },
volume = { 134 },
number = { 8 },
month = { January },
year = { 2016 },
issn = { 0975-8887 },
pages = { 22-27 },
numpages = {9},
url = { https://ijcaonline.org/archives/volume134/number8/23935-2016907959/ },
doi = { 10.5120/ijca2016907959 },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Journal Article
%1 2024-02-06T23:33:38.266149+05:30
%A Somanath Chikane
%A Sukhwinder K. Bhatia
%A Rajneesh Talwar
%T An Improved Image Watermarking based on LPM and AQIM
%J International Journal of Computer Applications
%@ 0975-8887
%V 134
%N 8
%P 22-27
%D 2016
%I Foundation of Computer Science (FCS), NY, USA
Abstract

Watermarking refers to the hiding of a message in a host message in such a way that if this signal is altered; the hidden message still survives if the host survives. Watermarking used for covert communication, Authentication, broadcast monitoring, tamper proofing, etc. This paper proposes an improved image watermarking scheme based on log polar mapping (LPM) and angle quantization index modulation (AQIM).To keep the watermark robust to translation, rotation and scaling attacks, Log Polar mapping followed by Fast Fourier transform is performed on the original unwater marked image before embedding the watermark. Using AQIM, the watermark is embedded in the gradient vectors of large magnitudes by quantizing the angle. Gradient vectors are obtained in the form of Discrete Wavelet Transform (DWT) coefficients. To makes the watermark robust to amplitude scaling attacks, this method Embeds watermark in the vector angle. Imperceptibility is increased by embedding watermark in the gradient vectors with large magnitudes. Increase in the watermarking capacity, is achieved by employing multiple levels DWT.

References
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Index Terms

Computer Science
Information Sciences

Keywords

LPM AQIM DWT DCT

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