Quantifying the Visual Content Perceived in DCT Coefficients and PKI Based Semi-fragile Watermarking for Visual Content Authentication of Images

2008 ◽  
Author(s):  
Chamidu Atupelage ◽  
Koichi Harada
Keyword(s):  
Fragile Watermarking ◽  
Content Authentication ◽  
Visual Content ◽  
Dct Coefficients

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 Self-Embedding Watermarking Scheme for Image Tamper Detection and Recovery

2013 ◽  
Vol 325-326 ◽  
pp. 1555-1558
Author(s):  
Jun Peng Zhang ◽  
Qing Fan Zhang ◽  
Xiu Ying Xie
Keyword(s):  
Random Sequence ◽  
Tamper Detection ◽  
Fragile Watermarking ◽  
Tamper Localization ◽  
Recovery Algorithm ◽  
Non Linear ◽  
Dct Coefficients ◽  
Watermarking Scheme

In this paper, an effective self-embedding fragile watermarking scheme is proposed. The watermark is generated by encoding the DCT coefficients of each 2×2 block and embedded into another block. A non-linear pseudo random sequence is used for generating the block mapping which can enhance the security of the algorithm. An improved tamper localization and recovery algorithm are performed. The experiment results show that the tamper region can be successfully localized and exactly recovered, even if under the content-only tampering.

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