Tamper localization and recovery watermarking schemes for medical images in PACS

This thesis focuses on the implementation of medical image watermarking in Picture Archiving and Communications System (PACS). PACS is an important part of information technology infrastructure in a health institution. Medical images stored in PACS are vulnerable to malicious modifications. Watermar...

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Main Author:	Liew, Siew Chuin
Format:	Thesis
Language:	English
Published:	2011
Subjects:	QA Mathematics QA76 Computer software
Online Access:	http://umpir.ump.edu.my/id/eprint/36713/1/TAMPER%20LOCALIZATION%20AND%20RECOVERY%20WATERMARKING%20SCHEMES%20FOR.pdf
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spelling	my-ump-ir.367132023-02-20T06:48:58Z Tamper localization and recovery watermarking schemes for medical images in PACS 2011-07 Liew, Siew Chuin QA Mathematics QA76 Computer software This thesis focuses on the implementation of medical image watermarking in Picture Archiving and Communications System (PACS). PACS is an important part of information technology infrastructure in a health institution. Medical images stored in PACS are vulnerable to malicious modifications. Watermarking can be used to authenticate medical images and provide the additional security needed on top of the existing security measures that were already in place. Watermarking methods applied to medical images should be reversible or if not, an area known as a region of interest (ROI) needs to be defined on the image to retain the original information. The watermarked image produced should have visual quality similar to its original version. Watermarking schemes should also be tested in a simulated operational environment for practicality verification. In this thesis, three watermarking schemes for medical image are proposed. All three watermarking schemes were tested by watermarking eight different samples. The PSNR of the watermarked images were measured. The watermarked images were tampered by cloning, salt and pepper noise, rotation and smoothing. The tampered images were recovered and the success rates were taken. The first proposed scheme, the reversible tamper localization and recovery scheme (R-TLR). The watermarked image can be reversed by restoring the least significant bits (LSBs) in a predefined region of interest (ROI) and regions of non-interest (RONI) to their original states. The watermarked images have an high average PSNR of 53.9 dB.The success rate of the tamper localization and recovery is close to 100%. Secondly, the tamper localization and lossless recovery (TALLOR) scheme uses compressed recovery information embedded outside of the ROI to achieve exact or lossless recovery after tampering is detected. Thirdly, an enhanced scheme, the tamper localization and lossless recovery with ROI segmentation (TALLOR-RS) is also proposed. It managed to reduce the tamper localization and recovery average processing time by approximately 53%. The average PSNR of the watermarked images for both schemes is high at 48.3 dB and 48.2 dB for TALLOR and TALLOR-RS respectively. The proposed schemes have 100% success rate for tamper localization and recovery. Both schemes also performed better than the scheme developed by Osamah and Khoo(2011). The proposed watermarking schemes were then tested in a simulated PACS environment with good results. A design of a watermark embedder and image authenticator (WEIA) to facilitate the implementation of watermarking in PACS is then proposed. In conclusion, watermarking schemes can be effectively implemented in practice to prevent fraud and improve information security. 2011-07 Thesis http://umpir.ump.edu.my/id/eprint/36713/ http://umpir.ump.edu.my/id/eprint/36713/1/TAMPER%20LOCALIZATION%20AND%20RECOVERY%20WATERMARKING%20SCHEMES%20FOR.pdf pdf en public phd doctoral Universiti Malaysia Pahang Faculty of Computer System and Software Engineering Jasni, Mohd Zain
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
advisor	Jasni, Mohd Zain
topic	QA Mathematics QA76 Computer software
spellingShingle	QA Mathematics QA76 Computer software Liew, Siew Chuin Tamper localization and recovery watermarking schemes for medical images in PACS
description	This thesis focuses on the implementation of medical image watermarking in Picture Archiving and Communications System (PACS). PACS is an important part of information technology infrastructure in a health institution. Medical images stored in PACS are vulnerable to malicious modifications. Watermarking can be used to authenticate medical images and provide the additional security needed on top of the existing security measures that were already in place. Watermarking methods applied to medical images should be reversible or if not, an area known as a region of interest (ROI) needs to be defined on the image to retain the original information. The watermarked image produced should have visual quality similar to its original version. Watermarking schemes should also be tested in a simulated operational environment for practicality verification. In this thesis, three watermarking schemes for medical image are proposed. All three watermarking schemes were tested by watermarking eight different samples. The PSNR of the watermarked images were measured. The watermarked images were tampered by cloning, salt and pepper noise, rotation and smoothing. The tampered images were recovered and the success rates were taken. The first proposed scheme, the reversible tamper localization and recovery scheme (R-TLR). The watermarked image can be reversed by restoring the least significant bits (LSBs) in a predefined region of interest (ROI) and regions of non-interest (RONI) to their original states. The watermarked images have an high average PSNR of 53.9 dB.The success rate of the tamper localization and recovery is close to 100%. Secondly, the tamper localization and lossless recovery (TALLOR) scheme uses compressed recovery information embedded outside of the ROI to achieve exact or lossless recovery after tampering is detected. Thirdly, an enhanced scheme, the tamper localization and lossless recovery with ROI segmentation (TALLOR-RS) is also proposed. It managed to reduce the tamper localization and recovery average processing time by approximately 53%. The average PSNR of the watermarked images for both schemes is high at 48.3 dB and 48.2 dB for TALLOR and TALLOR-RS respectively. The proposed schemes have 100% success rate for tamper localization and recovery. Both schemes also performed better than the scheme developed by Osamah and Khoo(2011). The proposed watermarking schemes were then tested in a simulated PACS environment with good results. A design of a watermark embedder and image authenticator (WEIA) to facilitate the implementation of watermarking in PACS is then proposed. In conclusion, watermarking schemes can be effectively implemented in practice to prevent fraud and improve information security.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Liew, Siew Chuin
author_facet	Liew, Siew Chuin
author_sort	Liew, Siew Chuin
title	Tamper localization and recovery watermarking schemes for medical images in PACS
title_short	Tamper localization and recovery watermarking schemes for medical images in PACS
title_full	Tamper localization and recovery watermarking schemes for medical images in PACS
title_fullStr	Tamper localization and recovery watermarking schemes for medical images in PACS
title_full_unstemmed	Tamper localization and recovery watermarking schemes for medical images in PACS
title_sort	tamper localization and recovery watermarking schemes for medical images in pacs
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Computer System and Software Engineering
publishDate	2011
url	http://umpir.ump.edu.my/id/eprint/36713/1/TAMPER%20LOCALIZATION%20AND%20RECOVERY%20WATERMARKING%20SCHEMES%20FOR.pdf
_version_	1783732253467082752

Tamper localization and recovery watermarking schemes for medical images in PACS

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