scholarly journals A Reversible Watermarking Scheme for Vector Maps Based on Multilevel Histogram Modification

Symmetry ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 397 ◽  
Author(s):  
Xiang Hou ◽  
Lianquan Min ◽  
Hui Yang
Keyword(s):  
Extraction Process ◽  
Reversible Watermarking ◽  
Histogram Modification ◽  
Vector Maps ◽  
Watermark Embedding ◽  
Lower Complexity ◽  
Histogram Bins ◽  
Map Data ◽  
Watermarking Scheme ◽  
Difference Histogram

To protect the security of vector maps, we propose a novel reversible watermarking scheme for vector maps based on a multilevel histogram modification. First, a difference histogram is constructed using the correlations of adjacent coordinates, and the histogram is divided into continuous regions and discontinuous regions by combining the characteristics of vector map data. Second, the histogram bins that require modification are determined in the continuous regions through the optimal peak value, and the peak values are chosen from the flanking discontinuous regions in both directions; the watermarks are embedded by adopting the multilevel histogram modification strategy. The watermark extraction process is the reverse of the embedding process, and after completing the watermark extraction, the carrier data can be recovered losslessly. The experimental results show that the proposed algorithm has good invisibility and is completely reversible. Compared with similar algorithms reported previously, it achieves higher watermark embedding capacity under the same embedding distortion with lower complexity, thereby having a higher application value.

scholarly journals Reversible Watermarking in Medical Image Using RDWT and Sub-Sample

Cryptography ◽  
2020 ◽  
pp. 480-497
Author(s):  
Lin Gao ◽  
Tiegang Gao ◽  
Jie Zhao
Keyword(s):  
Medical Image ◽  
Image Watermarking ◽  
Reversible Watermarking ◽  
Encryption Algorithm ◽  
Discrete Wavelet ◽  
Embedding Capacity ◽  
Watermark Embedding ◽  
Watermarking Scheme ◽  
Redundant Discrete Wavelet Transform ◽  
Image Encryption Algorithm

This paper proposed a reversible medical image watermarking scheme using Redundant Discrete Wavelet Transform (RDWT) and sub-sample. To meet the highly demand of the perceptional quality, the proposed scheme embedding the watermark by modifying the RDWT coefficients. The sub-sample scheme is introduced to the proposed scheme for the enhancement of the embedding capacity. Moreover, to meet the need of security, a PWLCM based image encryption algorithm is introduced for encrypting the image after the watermark embedding. The experimental results suggests that the proposed scheme not only meet the highly demand of the perceptional quality, but also have better embedding capacity than former DWT based scheme. Also the encryption scheme could protect the image contents efficiently.

Rich-information reversible watermarking scheme of vector maps

2019 ◽  
Vol 78 (17) ◽  
pp. 24955-24977 ◽  
Author(s):  
Yinguo Qiu ◽  
Hongtao Duan ◽  
Jiuyun Sun ◽  
Hehe Gu
Keyword(s):  
Reversible Watermarking ◽  
Vector Maps ◽  
Rich Information ◽  
Watermarking Scheme

A Reversible Watermarking Algorithm Resistant to Image Geometric Transformation

2019 ◽  
Vol 11 (1) ◽  
pp. 100-113
Author(s):  
Jian Li ◽  
Jinwei Wang ◽  
Shuang Yu ◽  
Xiangyang Luo
Keyword(s):  
High Performance ◽  
Side Information ◽  
Jpeg Compression ◽  
Reversible Watermarking ◽  
Experimental Results ◽  
Geometric Transformation ◽  
Original Image ◽  
Robust Watermark ◽  
Watermark Embedding ◽  
Watermarking Scheme

This article proposes a novel robust reversible watermarking algorithm. The proposed watermarking scheme is reversible because the original image can be recovered after extracting watermarks from the watermarked image, as long as it is not processed by an attacker. The scheme is robust because watermarks can still be extracted from watermarked images, even if it is undergone some malicious or normal operations like rotation and JPEG compression. It first selects two circles, which are centred at the centroid and the centre of image. Then, statistic quantities of these two circles are employed for robust watermark embedding by altering the pixels' value. The side information generated by above embedding process will be embedded as fragile watermarks at another stage to ensure the recovery of original image. Experimental results verify the high performance of the proposed algorithm in resisting various attacks, including JPEG compression and geometric transformation.

High-payload reversible watermarking scheme of vector maps

2017 ◽  
Vol 77 (5) ◽  
pp. 6385-6403 ◽  
Author(s):  
Yinguo Qiu ◽  
Hehe Gu ◽  
Jiuyun Sun
Keyword(s):  
Reversible Watermarking ◽  
Vector Maps ◽  
Watermarking Scheme ◽  
High Payload

Reversible Watermarking in Medical Image Using RDWT and Sub-Sample

2015 ◽  
Vol 7 (4) ◽  
pp. 1-18 ◽  
Author(s):  
Lin Gao ◽  
Tiegang Gao ◽  
Jie Zhao
Keyword(s):  
Medical Image ◽  
Image Watermarking ◽  
Reversible Watermarking ◽  
Encryption Algorithm ◽  
Discrete Wavelet ◽  
Embedding Capacity ◽  
Watermark Embedding ◽  
Watermarking Scheme ◽  
Redundant Discrete Wavelet Transform ◽  
Image Encryption Algorithm

This paper proposed a reversible medical image watermarking scheme using Redundant Discrete Wavelet Transform (RDWT) and sub-sample. To meet the highly demand of the perceptional quality, the proposed scheme embedding the watermark by modifying the RDWT coefficients. The sub-sample scheme is introduced to the proposed scheme for the enhancement of the embedding capacity. Moreover, to meet the need of security, a PWLCM based image encryption algorithm is introduced for encrypting the image after the watermark embedding. The experimental results suggests that the proposed scheme not only meet the highly demand of the perceptional quality, but also have better embedding capacity than former DWT based scheme. Also the encryption scheme could protect the image contents efficiently.

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

A Blind Image Watermarking Scheme Utilizing BTC Bitplanes

2011 ◽  
Vol 3 (4) ◽  
pp. 42-53 ◽  
Author(s):  
Chun-Ning Yang ◽  
Zhe-Ming Lu
Keyword(s):  
Image Watermarking ◽  
Image Authentication ◽  
Extraction Process ◽  
Experimental Results ◽  
Original Image ◽  
Image Block ◽  
Watermark Embedding ◽  
Extraction Processes ◽  
Watermarking Scheme ◽  
Blind Image

This paper presents a novel image watermarking scheme utilizing Block Truncation Coding (BTC). This scheme uses BTC to guide the watermark embedding and extraction processes. During the embedding process, the original cover image is first partitioned into non-overlapping 4×4 blocks. Then, BTC is performed on each block to obtain its BTC bitplane, and the number of ‘1’s in the bitplane is counted. If the watermark bit to be embedded is ‘1’ and the number of ‘1’s is odd, or the watermark bit to be embedded is ‘0’ and the number of ‘1’s is even, then no change is made. Otherwise, by changing at most three pixels in the original image block, the number of ‘1’s (or ‘0’s) in the renewed bitplane are forced to be odd for the watermark bit ‘1’ or to be even for the watermark bit ‘0’. During the extraction process, BTC is first performed on each block to obtain its bitplane. If the number of ‘1’s in the bitplane is odd, then the embedded watermark bit is ‘1’. Otherwise, the embedded watermark bit is ‘0’. The experimental results show that the proposed watermarking method is semi-fragile except for the changes in brightness and contrast; therefore, the proposed method can be used for image authentication.

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