A RobustWatermarking Approach for Images Authentication and Traceability.
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Date
2019-03-13
Authors
BELFERDI Wassila
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Abstract
Digital watermarking is a promising technology that has shown the ability to achieve the security and protection of image data.The enormous growth, use, and distribution of these images reveal security threats with legal and ethical complexities. Though, despite the wide interest that has, digital watermarking still not been widely adopted in some applications like image authentication with restoration ability. Existing watermarking schemes often suffer from technical and security flaws. Validation of the suitability of those schemes for an application becomes more challenging. One main reason for these problems is the compromise between the watermarked image quality, tamper localization and recovered image quality, which is a serious problem to the majority of current watermarking schemes with restoration ability. Addressing these gaps, in this thesis, a number of original contributions have been made. Starting with a comprehensive literature review on digital watermarking schemes and their applications and determine the requirements for watermarking, which has led to the following main contributions: A novel self-embedding watermarking scheme aims to authenticate the content of a watermarked image and to detect any possible alterations and recover damaged area is developed, the proposed scheme improves the performance in terms of imperceptibility and robustness, focusing on three major considerations: the invisibility of the embedded watermark, the accuracy of detection and the high quality of the recovered color image. Moreover, in support of developing a strict-authentication scheme for medical image applications, a novel digital signature-based scheme that uses the Cholesky decomposition is developed, which overcomes the limitations of existing schemes. Experimental results prove that the proposed scheme has higher capacity and more efficient detection ability In addition, aiming at developing a blind dual-color image watermarking scheme, a new watermark embedding scheme is addressed, which is different from some existing schemes that use the binary or gray-level image as watermark. Experimental results demonstrate the stronger robustness of the proposed scheme against most common attacks including image compression, cropping, noising and scaling, etc, that allows this scheme to be applicable for traceability applications. The presented new self-authentication model would help develop more secure selfauthentication scheme with restoration ability. Additionally, the presented Cholesky digital signature-based scheme for medical images and its validation has created a new efficient approach, which can be used for different applications including content authentication and tamper detection. Moreover, the proposed blind dual-color image watermarking scheme offers an efficient robust tool for images traceability