A comparison of DCT and DWT block based watermarking on medical image quality

Dowling, Jason, Planitz, Birgit M., Maeder, Anthony J., Du, Jiang, Pham, Binh, Boyd, Colin, Chen, Shaokang, Bradley, Andrew P. and Crozier, Stuart (2008). A comparison of DCT and DWT block based watermarking on medical image quality. In: Yun Q. Shi, Hyoung-Joong Kim and Stefan Katzenbeisser, Digital Watermarking: 6th International Workshop, IWDW 2007 proceedings. 6th International Workshop on Digital Watermarking, Guangzhou, China, (454-466). 3-5 December 2007. doi:10.1007/978-3-540-92238-4_35

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Author Dowling, Jason
Planitz, Birgit M.
Maeder, Anthony J.
Du, Jiang
Pham, Binh
Boyd, Colin
Chen, Shaokang
Bradley, Andrew P.
Crozier, Stuart
Title of paper A comparison of DCT and DWT block based watermarking on medical image quality
Conference name 6th International Workshop on Digital Watermarking
Conference location Guangzhou, China
Conference dates 3-5 December 2007
Proceedings title Digital Watermarking: 6th International Workshop, IWDW 2007 proceedings   Check publisher's open access policy
Journal name Lecture Notes in Computer Science   Check publisher's open access policy
Place of Publication Heidelberg, Germany
Publisher Springer
Publication Year 2008
Sub-type Fully published paper
DOI 10.1007/978-3-540-92238-4_35
ISBN 9783540922377
ISSN 0302-9743
Editor Yun Q. Shi
Hyoung-Joong Kim
Stefan Katzenbeisser
Volume 5041
Start page 454
End page 466
Total pages 13
Language eng
Abstract/Summary Hiding watermark information in medical image data files is one method of enhancing security and protecting patient privacy. However the research area of medical image watermarking has not been particularly active, partly due to concerns that any distortion could affect the diagnostic value of the medical image. These concerns can be addressed by ensuring that any image changes are kept below visual perception thresholds. In this paper the effects of image watermarking and common image manipulations are measured using the Peak Signal-to-Noise Ratio (PSNR), Structural Similarity Measure (SSIM) and Steerable Visual Difference Predictor (SVDP) numerical metrics. Two methods of block based watermarking are compared: the Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). To ensure a fair comparison a 128-pixel block size is used which allows an identical amount of information to be embedded for each method (3072 bits multiplied by embedding strength). The results suggest that although the two methods are similar, the DCT method is preferable if localization of changes is required. If localization is not required the DWT method is supported.
Keyword Digital image watermarking
Information hiding
Perceptual factors
Human observers
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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