Authentication and protection for medical image

Authors:
Chih-Hung Lin;Ching-Yu Yang;Chia-Wei Chang
Affiliations:
Dept. of Computer Science and Information Engineering, Southern Taiwan University, Yongkang City, Tainan County, Taiwan;Dept. of Computer Science and Information Engineering, National Penghu University of Science and Technology, Magong, Penghu, Taiwan;Dept. of Computer Science and Information Engineering, Southern Taiwan University, Yongkang City, Tainan County, Taiwan
Venue:
ICCCI'10 Proceedings of the Second international conference on Computational collective intelligence: technologies and applications - Volume Part II
Year:
2010

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Abstract

This paper proposes a method to authenticate and protect medical images, especially in the region of interest (ROI). The ROI of a medical image is an important area during diagnosis and must not be distorted during transmission and storage in the hospital information system. The rest of the ROI is used for embedding a watermark that contains the patients data and authentication information, and the authentication information is generated from the ROI by analyzing wavelet coefficients with singular value decomposition (SVD), before embedding the watermark into the discrete wavelet transform (DWT) sub-band. It is important that the ratio of ROI and non-ROI areas is consistent between different systems and doctors, and this ratio is analyzed in this paper. The ROI of watermarked medical image is fragile to any distortion, and patients data and authentication information can be easily extracted from non-ROI. The effectiveness of the new approach is demonstrated empirically.