Privacy-Preserving Reversible Data Hiding for Medical Images Employing Local Rotation.

Guo-Dong Su,Chin-Chen Chang,Chia-Chen Lin,Chi-Hua Chen

doi:10.1155/2021/5709513

Abstract

As digitalization becomes more common, patients' concerns about the leakage of private information, such as electronic medical record, are increasing, and those concerns motivated this case study of secure covert communication. Therefore, in this paper, a novel reversible data hiding method based on pixel rotation is proposed for medical images. Using pixel rotation, a state mapping model is constructed to represent the payload. More specifically, many intermediate states are derived from an image block, and each of them is used to form a one-to-one mapping relationship with a specific sequence of payload bits. In addition, to ensure the visual quality of stego-medical-images, the payload bits are only concealed in the regular blocks and the other blocks are unchanged. Moreover, the smoother regular image block will be priority to be used to embed the payload to enhance the visual quality of stego-medical-image. The experimental results showed that the stego-medical-images generated by the proposed reversible data hiding method have better visual quality with an average PSNR of 47.0307 dB, which is higher than that provided by some state-of-the-art methods.

Highlights

With the rapid development of telecommunication and computer sciences, informatization and digitization have been in many fields, such as banking and healthcare, and the result is e-banking and e-healthcare
It is important to note that this method has the feature of reversibility if the replacement of the LSBs is not conducted for its NROI. e proposed reversible data hiding (RDH) method employs the idea of pixel rotation to insert the secret data into the medical image with reversibility
According to the characteristic of pixel distribution of the medical image, the proposed RDH method separates all image blocks into the regular blocks, singular blocks, unusable blocks, and overflow blocks. e payload is only inserted into the regular blocks to reduce the invalid rotation on pixels

Summary

Introduction

With the rapid development of telecommunication and computer sciences, informatization and digitization have been in many fields, such as banking and healthcare, and the result is e-banking and e-healthcare. Us, the researchers in this area have focused their attention on irreversible data hiding [3,4,5] and reversible data hiding (RDH) [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25] in medical images, which are techniques that can provide security and avoid attracting the attention of attackers. RDH is a technique for processing multimedia signals that aims to hide secret data, such as EMR, into the original images, resulting in stego-images, in which the data are embedded.

Methods

Results

Conclusion