A high capacity reversible watermarking scheme for relational databases based on mapping difference expansion

2017 ◽  
Author(s):  
Yin Qing ◽  
Yuesheng Zhu ◽  
Fan Yang ◽  
Yifeng Jiang
Keyword(s):  
Relational Databases ◽  
High Capacity ◽  
Reversible Watermarking ◽  
Difference Expansion ◽  
Watermarking Scheme

scholarly journals High Capacity Reversible Watermarking Scheme for 2D Vector Maps

2015 ◽  
Author(s):  
Xiaowei Jing ◽  
Mei Feng ◽  
Biao Guo ◽  
Liang Chen ◽  
Youjian Zhao ◽  
...  
Keyword(s):  
High Capacity ◽  
Reversible Watermarking ◽  
Vector Maps ◽  
Watermarking Scheme

Half Difference Expansion Based Reversible Data Hiding Scheme for Medical Image Forensics

2020 ◽  
Vol 16 (4) ◽  
pp. 383-396
Author(s):  
Vazhora Malayil Manikandan ◽  
Nelapati Lava Prasad ◽  
Masilamani Vedhanayagam
Keyword(s):  
Medical Image ◽  
Medical Images ◽  
Visual Quality ◽  
Image Forensics ◽  
Reversible Watermarking ◽  
Difference Expansion ◽  
Data Set ◽  
Watermarking Scheme ◽  
Embedding Rate

Background: Medical image authentication is an important area which attempts to establish ownership authentication and data authentication of medical images. Aims: In this paper, we propose a new reversible watermarking scheme based on a novel half difference expansion technique for medical image forensics. Methods: Conventional difference expansion based reversible watermarking scheme generates watermarked images with less visual quality, and the embedding rate was considerably less due to the high probability of overflow or underflow. In the proposed scheme, the quality of the watermarked image has been improved by modifying the traditional difference expansion based watermarking scheme, half of the difference between two pixels will be expanded during watermarking. The modification of pixels during watermarking is limited by expanding half of the pixel difference, which helps to obtain watermarked images with better visual quality and improved embedding rate due to less chance of overflow or underflow during watermarking. We also propose a tamper detection localization process to detect the tampered regions from the watermarked image. Results: Experimental study of the proposed scheme on the standard medical images from Osrix medical image data set shows that the proposed watermarking scheme outperforms the existing schemes in terms of visual quality of the watermarked image and embedding rate. Conclusion: The overhead related to location map and parity information need to be addressed in future works to improve the proposed scheme.

High-capacity reversible watermarking scheme of 2D-vector data

2014 ◽  
Vol 9 (6) ◽  
pp. 1387-1394 ◽  
Author(s):  
Liujuan Cao ◽  
Chaoguang Men ◽  
Rongrong Ji
Keyword(s):  
High Capacity ◽  
Reversible Watermarking ◽  
Vector Data ◽  
Watermarking Scheme
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