Additive vs. Image Dependent DWT-DCT Based Watermarking

Emek, S.; Pazarcı, Melih

doi:10.1007/11848035_15

Cited by 7 publications

(1 citation statement)

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“…Fotopoulos and Skodras [12] decompose the original image into four bands using the Haar wavelet, and then perform DCT on each of the bands; the watermark is embedded into the DCT coefficients of each band. Serkan Emek and Melih Pazarci [13] compared image dependent and additive blind watermarking algorithms that embed a watermark in the DWT-DCT domain by taking the properties of the HVS into account [14]. The image dependent algorithm modulates the watermarking coefficients with original mid-frequency DWT-DCT coefficients [15].…”

Section: Introductionmentioning

confidence: 99%

Robust Digital Image Watermarking Based on Joint DWT-DCT

Amirgholipour¹

2009

JDCTA

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In this paper, a new robust digital image watermarking algorithm based on Joint DWT-DCT Transformation is proposed. A binary watermarked logo is scrambled by Arnold cat map and embedded in certain coefficient sets of a 3-level DWT transformed of a host image. Then, DCT transform of each selected DWT sub-band is computed and the PN-sequences of the watermark bits are embedded in the middle frequencies coefficients of the corresponding DCT block. In extraction procedure, the watermarked image, which maybe attacked, is pre-filtered by combination of sharpening and Laplassian of Gaussian filters to increase distinction between host image and watermark information. Subsequently, the same procedures as the embedding process is used to extract the DCT middle frequencies of each sub-band. Finally, correlation between mid-band coefficients and PNsequences is calculated to determine watermarked bits. Experimental results show that high imperceptibility is provided as well as higher robustness against common signal processing attacks. In compare to current watermarking algorithms which are based on the joint of DWT-DCT, proposed system is achieved significantly higher robustness against enhancement and noise addition attacks.

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Section: Introductionmentioning

confidence: 99%

Robust Digital Image Watermarking Based on Joint DWT-DCT

Amirgholipour¹

2009

JDCTA

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A QR Code Watermarking Approach Based on the DWT-DCT Technique

Chow

Susilo

Tonien

et al. 2017

Lecture Notes in Computer Science

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The rapid growth in Internet and communication technology has facilitated an escalation in the exchange of digital multimedia content. This has resulted in an increase in copyright infringement, which has led to a greater demand for more robust copyright protection mechanisms. Digital watermarking is a means of detecting ownership and illegal use of digital products. This paper presents an approach to watermarking images by embedding QR code information in a digital image.Abstract. The rapid growth in Internet and communication technology has facilitated an escalation in the exchange of digital multimedia content. This has resulted in an increase in copyright infringement, which has led to a greater demand for more robust copyright protection mechanisms. Digital watermarking is a means of detecting ownership and illegal use of digital products. This paper presents an approach to watermarking images by embedding QR code information in a digital image. The notion of the proposed scheme is to capitalize on the error correction mechanism that is inherent in the QR code structure, in order to increase the robustness of the watermark. By employing the QR code's error correction mechanism, watermark information contained within a watermarked image can potentially be decoded even if the image has been altered or distorted by an adversary. This paper studies the characteristics of the proposed scheme and presents experiment results examining the robustness and security of the QR code watermarking approach.

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