Abstract
The watermarking scheme in digital media communication has become an essential tool in helping content creators prove ownership if any dispute arises in copyright infringement. In this paper, Discrete Wavelet Transform (DWT) and Singular Value Decomposition (SVD) is performed in the watermarking process which improves the authentication of the image and the detection of the tampered region. The semi-fragile watermarking scheme provides robustness to the watermark during extraction process even after the unintentional compression attacks like JPEG compression. The watermark payload is significantly lowered in order to increase the quality of the image. The recovery is done using the absolute moment block truncation coding (AMBTC) of the image in the untampered region. Thus, both the mean and first absolute moment are used in recovering the tampered regions in the watermarked image.
Highlights
Watermarking involves hiding a secret message like text, audio or image in the data to preserve the Revised Manuscript Received on May 15, 2020. * Correspondence Author
A semi-fragile watermarking technique in wavelet domain is proposed to embed the watermark in the image and the watermark is robust to the unintentional tampering such as JPEG compression attacks
Semi-Fragile Watermarking with Tamper Localization and Recovery using absolute moment block truncation coding (AMBTC) method with the extracted flags obtained from the attacked image
Summary
Data protection in the digital world is a necessity to protect our private contents from being misused by malicious attackers. The common methods to secure our information are cryptography, steganography and watermarking. Watermarking involves hiding a secret message like text, audio or image in the data to preserve the Revised Manuscript Received on May 15, 2020. The digital watermarks are embedded either visible or invisible in the information. These watermarks are classified into three different categories: robust, fragile and semi-fragile watermark. The semi-fragile watermarking uses watermarks that can resist unintentional manipulations caused by common image processing operations like JPEG compression and are fragile against intentional and malicious manipulations. A semi-fragile watermarking technique in wavelet domain is proposed to embed the watermark in the image and the watermark is robust to the unintentional tampering such as JPEG compression attacks. The recovery was done using the AMBTC method of untampered regions in the image
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