Image content authentication and tamper localization based on semi fragile watermarking by using the Curvelet transform

2012 ◽  
Author(s):  
M. R. Akbarzadeh ◽  
S. Ghofrani
Keyword(s):  
Curvelet Transform ◽  
Fragile Watermarking ◽  
Content Authentication ◽  
Tamper Localization ◽  
Image Content

QUANTIZATION-BASED FRAGILE WATERMARKING USING BLOCK-WISE AUTHENTICATION AND PIXEL-WISE RECOVERY SCHEME FOR TAMPERED IMAGE

2013 ◽  
Vol 13 (02) ◽  
pp. 1340002 ◽  
Author(s):  
DURGESH SINGH ◽  
SHIVENDRA SHIVANI ◽  
SUNEETA AGARWAL
Keyword(s):  
Fragile Watermarking ◽  
Content Authentication ◽  
Image Content ◽  
Recovery Scheme ◽  
Tamper Recovery ◽  
Tampered Image ◽  
Watermarking Scheme ◽  
Content Recovery ◽  
Least Significant Bits

This paper suggests an efficient fragile watermarking scheme for image content authentication along with altered region restoration capability. In this scheme, image is divided into nonoverlapping blocks of size 2 × 2 and for each block, eight bits for image content recovery data and four bits for authentication data from five most significant bits (MSBs) of each pixel, are generated. These 12 bits are embedded into the least significant bits (LSBs) of the pixels which are placed in its corresponding mapping block. At the receiver end by comparing the recalculated and extracted authentication data, the tampered blocks can easily be identified and using recovery data, one can easily restore the tampered block. Results of experiments demonstrate that the proposed scheme is effective enough for alteration detection as well as tamper recovery of the image.

A New Fragile Watermarking Based on Chaos

2013 ◽  
Vol 401-403 ◽  
pp. 1772-1775
Author(s):  
Hui Fen Huang
Keyword(s):  
Good Practice ◽  
Chaotic Sequence ◽  
Fragile Watermarking ◽  
Image Feature ◽  
Original Image ◽  
Content Authentication ◽  
Tamper Localization ◽  
Image Block ◽  
Positioning Accuracy ◽  
Security Issues

For existing airspace fragile authentication watermarking algorithm positioning accuracy and security issues, this paper presents a fully-fragile watermarking based on chaos for the integrity of the image content authentication and tamper localization. The algorithm uses the original image block, the calculation of each pixel in the image block high-bit gray value as the image feature watermark information. The chaotic sequence is encrypted and determines the position of the watermark bit is embedded watermark information, tampering with the positioning accuracy of an image block of 2 × 2 pixels. Experimental results show that the algorithm is simple, safe, with good practice.

A Novel Verification Scheme for Watermarking Based Image Content Authentication Systems

2008 ◽  
Vol 67 (19) ◽  
pp. 1777-1790 ◽  
Author(s):  
C. Cruz-Ramos ◽  
R. Reyes-Reyes ◽  
J. Mendoza-Noriega ◽  
Mariko Nakano-Miyatake ◽  
Hector Manuel Perez-Meana
Keyword(s):  
Content Authentication ◽  
Image Content ◽  
Verification Scheme
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