School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore.
J Digit Imaging. 2012 Dec;25(6):751-63. doi: 10.1007/s10278-012-9518-y.
The development of teleradiology brings the convenience of global medical record access along with the concerns over the security of medical images transmitted over the open network. With the prevailing adoption of three-dimensional (3-D) imaging modalities, it is vital to develop a security mechanism to provide large volumes of medical images with privacy and reliability. This paper presents the development of a new and improved method of implementing tamper detection and localization based on a fully reversible digital watermarking scheme for the protection of volumetric DICOM images. This tamper detection and localization method utilizes the 3-D property of volumetric data to achieve much faster processing time at both sender and receiver sides without compromising tamper localization accuracy. The performance of the proposed scheme was evaluated by using sample volumetric DICOM images. Results show that the scheme achieved on average about 65 % and 72 % reduction in watermarking and dewatermarking processing time, respectively. For cases where the images had been tampered, it is possible to detect and localize the tampered areas with improved localization resolution in the images using the scheme.
远程放射学的发展带来了全球病历访问的便利，但也引发了对通过开放网络传输的医学图像安全性的担忧。随着三维（3-D）成像模式的广泛采用，开发一种安全机制来为大量医学图像提供隐私和可靠性至关重要。本文提出了一种新的改进方法，该方法基于完全可逆的数字水印方案来实现篡改检测和定位，以保护容积 DICOM 图像。这种篡改检测和定位方法利用容积数据的 3-D 特性，在不影响篡改定位精度的情况下，在发送方和接收方实现更快的处理时间。使用样本容积 DICOM 图像评估了所提出方案的性能。结果表明，该方案在水印和去水印处理时间上分别平均减少了约 65%和 72%。对于图像已被篡改的情况，该方案可以使用改进的定位分辨率来检测和定位篡改区域。
