Abstract

Digital image watermarking is the process of concealing secret information in a digital image for protecting its rightful ownership. Most of the existing block based singular value decomposition (SVD) digital watermarking schemes are not robust to geometric distortions, such as rotation in an integer multiple of ninety degree and image flipping, which change the locations of the pixels but don’t make any changes to the pixel’s intensity of the image. Also, the schemes have used a constant scaling factor to give the same weightage to the coefficients of different magnitudes that results in visible distortion in some regions of the watermarked image. Therefore, to overcome the problems mentioned here, this paper proposes a novel image watermarking scheme by incorporating the concepts of redistributed image normalization and variable scaling factor depending on the coefficient’s magnitude to be embedded. Furthermore, to enhance the security and robustness the watermark is shuffled by using the piecewise linear chaotic map before the embedding. To investigate the robustness of the scheme several attacks are applied to seriously distort the watermarked image. Empirical analysis of the results has demonstrated the efficiency of the proposed scheme.

Highlights

  • Digital watermarking [1, 2] is the process of insertion of digital watermark in media content and its extraction, if required, for authentication or ownership verification of media content

  • The invariance is in the sense that the location of the pixels in a block may vary but the elements are always the same

  • The principal component of the watermark image is embedded into these largest singular values by employing a variable scaling factor

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Summary

Introduction

Digital watermarking [1, 2] is the process of insertion of digital watermark in media content and its extraction, if required, for authentication or ownership verification of media content. The different regions within an image have different local features, so some visual models such as human visual system (HVS) may be incorporated in finding the suitable embedding regions to improve robustness while maintaining imperceptibility Based on this concept, a blind SVD-based watermarking scheme is presented in [34]. The largest singular value of each block is modified by adding to it a scalar multiple of the corresponding element of the principal component matrix of the watermark This reliable SVD-based watermarking scheme has solved the false positive detection problem and shown the resistance against some image manipulation attacks. It is not robust against some special distortions, such as image rotation in integer multiple of ninety degrees and image flipping (rows/columns).

Brief Review of Components of the Proposed Scheme
The Proposed Scheme
Results and Discussions
12 Attack NO

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