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DCT based efficient fragile watermarking scheme for image authentication and restoration

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Abstract

Due to rapid development of Internet and computer technology, image authentication and restoration are very essential, especially when it is utilized in forensic science, medical imaging and evidence of court. A quantization and Discrete Cosine Transform(DCT) based self-embedding fragile watermarking scheme with effective image authentication and restoration quality is proposed in this paper. In this scheme, the cover image is divided in size of 2×2 non-overlapping blocks. For each block twelve bits watermark are generated from the five most significant bits (MSBs) of each pixel and are embedded into the three least significant bits (LSBs) of the pixels corresponding to the mapped block. The proposed scheme uses two levels encoding for content restoration bits generation. The restoration is achievable with high PSNR and NCC up to 50 % tampering rate. The experimental results demonstrate that the proposed scheme not only outperforms high quality restoration effectively, but also removes the blocking artifacts and improves the accuracy of tamper localization due to use of very small size blocks.

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Authors and Affiliations

  1. Department of Computer Science & Engineering, Indian Institute of Technology (BHU), Varanasi, Varanasi, Uttar Pradesh, 221005, India

    Durgesh Singh & Sanjay K. Singh

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  1. Durgesh Singh
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  2. Sanjay K. Singh
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Correspondence to Durgesh Singh.

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Singh, D., Singh, S.K. DCT based efficient fragile watermarking scheme for image authentication and restoration. Multimed Tools Appl 76, 953–977 (2017). https://doi.org/10.1007/s11042-015-3010-x

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  • DOI: https://doi.org/10.1007/s11042-015-3010-x

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