Colour image watermarking using discrete cosine transform and two-level singular value decomposition

Digital image watermarking is a technique used for hiding digital information in a carrier image. It is predominantly used for copyright protection against copyright infringement and malicious attacks. Embedding a watermark in the frequency domain is becoming more attractive for the majority of rese...

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Main Author:	Ali, Bokan Omar
Format:	Thesis
Language:	English
Published:	2013
Subjects:	QA76 Computer software
Online Access:	http://eprints.utm.my/id/eprint/41601/5/BokanOmarAliMFSKSM2013.pdf
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id	my-utm-ep.41601
record_format	uketd_dc
spelling	my-utm-ep.416012017-06-21T01:26:59Z Colour image watermarking using discrete cosine transform and two-level singular value decomposition 2013-11 Ali, Bokan Omar QA76 Computer software Digital image watermarking is a technique used for hiding digital information in a carrier image. It is predominantly used for copyright protection against copyright infringement and malicious attacks. Embedding a watermark in the frequency domain is becoming more attractive for the majority of researchers as it can provide better performance. In this research, colour image watermarking using Discrete Cosine Transform (DCT) and two-level Singular Value Decomposition (SVD) is proposed. First step is preparing RGB colour image as the cover image and greyscale image as the watermark. The RGB host image is divided into R, G and B channels and the B channel is then selected. The selected channel is then divided into non-overlapping square blocks of (4x4) pixels to match the watermark size. Next, the DCT is applied to each block. DC component is then retrieved and collected from each block in order to obtain a new block of (128x128) pixels. Following that, SVD is applied to the block to generate three matrices, U, S and V. Finally, the greyscale watermark is embedded in the S matrix. Once the embedding is completed, the R, G and embedded B channel are then merged to obtain a watermarked image. Experimental results show that the average PSNR value is higher than 53 dB, which means that the proposed method is imperceptible to naked eyes. Also, the average NCC value is higher than 0.97, which indicates the proposed method has strong robustness against major attacks. 2013-11 Thesis http://eprints.utm.my/id/eprint/41601/ http://eprints.utm.my/id/eprint/41601/5/BokanOmarAliMFSKSM2013.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Computing Faculty of Computing
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QA76 Computer software
spellingShingle	QA76 Computer software Ali, Bokan Omar Colour image watermarking using discrete cosine transform and two-level singular value decomposition
description	Digital image watermarking is a technique used for hiding digital information in a carrier image. It is predominantly used for copyright protection against copyright infringement and malicious attacks. Embedding a watermark in the frequency domain is becoming more attractive for the majority of researchers as it can provide better performance. In this research, colour image watermarking using Discrete Cosine Transform (DCT) and two-level Singular Value Decomposition (SVD) is proposed. First step is preparing RGB colour image as the cover image and greyscale image as the watermark. The RGB host image is divided into R, G and B channels and the B channel is then selected. The selected channel is then divided into non-overlapping square blocks of (4x4) pixels to match the watermark size. Next, the DCT is applied to each block. DC component is then retrieved and collected from each block in order to obtain a new block of (128x128) pixels. Following that, SVD is applied to the block to generate three matrices, U, S and V. Finally, the greyscale watermark is embedded in the S matrix. Once the embedding is completed, the R, G and embedded B channel are then merged to obtain a watermarked image. Experimental results show that the average PSNR value is higher than 53 dB, which means that the proposed method is imperceptible to naked eyes. Also, the average NCC value is higher than 0.97, which indicates the proposed method has strong robustness against major attacks.
format	Thesis
qualification_level	Master's degree
author	Ali, Bokan Omar
author_facet	Ali, Bokan Omar
author_sort	Ali, Bokan Omar
title	Colour image watermarking using discrete cosine transform and two-level singular value decomposition
title_short	Colour image watermarking using discrete cosine transform and two-level singular value decomposition
title_full	Colour image watermarking using discrete cosine transform and two-level singular value decomposition
title_fullStr	Colour image watermarking using discrete cosine transform and two-level singular value decomposition
title_full_unstemmed	Colour image watermarking using discrete cosine transform and two-level singular value decomposition
title_sort	colour image watermarking using discrete cosine transform and two-level singular value decomposition
granting_institution	Universiti Teknologi Malaysia, Faculty of Computing
granting_department	Faculty of Computing
publishDate	2013
url	http://eprints.utm.my/id/eprint/41601/5/BokanOmarAliMFSKSM2013.pdf
_version_	1747816579977969664

Colour image watermarking using discrete cosine transform and two-level singular value decomposition

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