A Novel Fractional‐Discrete‐Cosine‐Transform‐Based Reversible Watermarking for Healthcare Information Management Systems
Lu-Ting Ko, Jwu-E Chen, Yaw-Shih Shieh, Massimo Scalia, Tze‐Yun Sung · Mathematical Problems in Engineering · 2012
Digital watermarking is a good tool for healthcare information management systems. The well‐known quantization‐index‐modulation‐ (QIM‐) based watermarking has its limitations as the host image will be destroyed; however, the recovery of medical image is essential to avoid misdiagnosis. A transparent yet reversible watermarking algorithm is required for medical image applications. In this paper, we propose a fractional‐discrete‐cosine‐transform‐ (FDCT‐) based watermarking to exactly reconstruct the host image. Experimental results show that the FDCT‐based watermarking is preferable to the QIM‐based watermarking for the medical image applications.