Department of Computer Science and Engineering, National Engineering College, Kovilpatti 628503, India.
Comput Math Methods Med. 2013;2013:516465. doi: 10.1155/2013/516465. Epub 2013 Jul 18.
Healthcare institutions adapt cloud based archiving of medical images and patient records to share them efficiently. Controlled access to these records and authentication of images must be enforced to mitigate fraudulent activities and medical errors. This paper presents a zero-watermarking scheme implemented in the composite Contourlet Transform (CT)-Singular Value Decomposition (SVD) domain for unambiguous authentication of medical images. Further, a framework is proposed for accessing patient records based on the watermarking scheme. The patient identification details and a link to patient data encoded into a Quick Response (QR) code serves as the watermark. In the proposed scheme, the medical image is not subjected to degradations due to watermarking. Patient authentication and authorized access to patient data are realized on combining a Secret Share with the Master Share constructed from invariant features of the medical image. The Hu's invariant image moments are exploited in creating the Master Share. The proposed system is evaluated with Checkmark software and is found to be robust to both geometric and non geometric attacks.
医疗机构采用基于云的医疗图像和患者记录归档方式，以实现高效共享。必须对这些记录进行受控访问，并对图像进行身份验证，以减轻欺诈活动和医疗错误。本文提出了一种在复合 Contourlet 变换 (CT)-奇异值分解 (SVD) 域中实现的零水印方案，用于对医疗图像进行明确的身份验证。此外，还提出了一种基于水印方案的患者记录访问框架。患者身份识别详细信息和链接到编码到快速响应 (QR) 码中的患者数据作为水印。在提出的方案中，由于水印的存在，医疗图像不会受到降级的影响。通过将秘密共享与从医学图像不变特征构建的主共享相结合，实现了患者身份验证和对患者数据的授权访问。利用 Hu 的不变图像矩来创建主共享。该系统使用 Checkmark 软件进行评估，发现它对几何和非几何攻击都具有鲁棒性。
