Robustness improvement in spread spectrum watermarking using M-ary modulation (original) (raw)

Spread Spectrum based Mary Modulated Robust Image Watermarking

2007

Spread Spectrum (SS) modulation principle has been widely used in digital watermarking due to its distinguishing characteristics viz. excellent security and robustness in performance. The use of wide spectrum of the host signal in message hiding process puts a limit on the data rate subject to a given embedding distortion. In SS communication the use of Mary modulation is a popular extension to binary antipodal signaling usually resulting in a significant performance improvement. Moreover, with the increasing M and for certain schemes, M-ary modulation works at the channel capacity. The present work investigates on how to use M-ary modulation in the context of transform domain SS watermarking for performance improvement over binary signaling schemes. Furthermore, relevant computational complexity issue of M-ary watermarking is also reduced to a greater extent by the implementation of Mary phase modulation. The present work also suggests data embedding in selected sub bands (DWT) or channels (M-band) of wavelet transform decomposition. Performance improvement of M-ary signaling principle in SS scheme with respect to error rate, complexity and superiority of wavelet domain embedding approach are supported by experimental results against lossy compressions.

Redundant Wavelet Watermarking using Spread Spectrum Modulation

2008

Spread Spectrum modulation has become a preferred paradigm in many watermarking applications. This paper analyzes the performance of such a blind watermarking scheme under discrete wavelet frame rather than a traditional orthonormal wavelet expansion. The over complete representation offered by the redundant frame facilitates the identification of significant image features via a simple correlation operation across scales. The performance and resiliency of the proposed technique are analyzed against several volumetric distortion sources. The experimental results of this oblivious algorithm illustrate better visual and statistical imperceptibility and robustness compared to the usually critically sampled discrete wavelet transform. This algorithmic architecture utilizes the existing allocated bandwidth in the data transmission channel in a more efficient manner.

Design of a robust spread spectrum image watermarking scheme

2004

Robustness is the key attribute of Spread Spectrum (SS) watermarking scheme. Several SS image watermarking algorithms have been proposed for multimedia signals but very few works have taken into consideration the issues responsible for robustness improvement. The current paper has critically analyzed few such factors namely properties of spreading codes, proper signal decomposition suitable for data embedding and the choice of modulation functions etc. that have greater impact on detection reliability. Based on the analysis robust SS watermarking scheme is proposed in wavelet domain and improvement in robustness performance is reported through experimental results. Proposed algorithm also shows improvement in visual and statistical invisibility of the hidden data.

ERROR CONTROL CODING BASED ROBUST SPREAD SPECTRUM WATERMARKING

This paper proposes an oblivious watermarking algorithm with blind detection approach for high volume data hiding in image signals. We present a detection reliable signal adaptive embedding scheme for multiple messages in selective sub-bands of wavelet (DWT) coefficients using direct sequence spread spectrum (DS-SS) modulation technique. Here the impact of various distortion sources is analyzed on the ability of analytical bounds in order to recover the watermark messages. In this context, the joint sourcechannel coding scheme has been employed to obtain the better control of the system robustness. This structure prevents the desynchronisation between encoder and decoder due to selective embedding. The experimental results obtained for Spread Spectrum (SS) transformed domain watermarking demonstrate the efficiency of the proposed system. This algorithmic architecture utilizes the existing allocated bandwidth in the data transmission channel in a more efficient manner.

IJERT-Digital Image Watermarking using Spread Spectrum Technique under DWT Domain

International Journal of Engineering Research and Technology (IJERT), 2014

https://www.ijert.org/digital-image-watermarking-using-spread-spectrum-technique-under-dwt-domain https://www.ijert.org/research/digital-image-watermarking-using-spread-spectrum-technique-under-dwt-domain-IJERTV3IS030497.pdf In the recent few years, it has become a daily need to distribute digital images as a part of widespread multimedia technology by means of the World Wide Web. Digital Image Watermarking techniques have been developed to protect digital images from illegal reproductions and illegal modifications. So these techniques have developed widely to maintain the broadcasting media and content authentication, broadcast monitoring, tamper detection, copyright protection, and many other applications. This paper highlights a new scheme for Digital Image Watermarking using Spread Spectrum Technique under DWT Domain. It starts with the general watermarking procedure, the attributes and applications of Digital Image Watermarking and attacks on Digital Image Watermarking. Moreover, the experimental results showed that the proposed scheme provides better quality of watermarked images in terms of watermark invisibility to human eyes and low data payload during embedding and extraction process. In addition, some possible attacks on watermarked images are discussed. To check the Imperceptibility and Robustness, Peak Signal Noise Ratio (PSNR) is being used. General Terms World Wide Web (WWW), Digital Image Watermarking, Spread Spectrum, Discrete Wavelet Transform (DWT).

Enhanced Spread Spectrum Watermarker Using Discrete Multiwavelet

2018

In this paper, a multibit, multiplicative, watermarking using the texture area transform is presented. Performance improvement is obtained by means of a new Just Perceptual Weighting (JPW) model than existing one. The new model incorporates various masking effects of human visual perception by taking into account the eye’s sensitivity to noise changes depending on spatial frequency and texture of all the image area. The area with dense high brightness and dense low brightness is taken for watermarking. The quality of the watermarked image and robustness of the watermark are improved by this proposed system compared with a variety existing algorithms. The application for implementing the algorithm is developed using MATLAB 7.6 IndexTerms watermark, texture. _________________________________________________________________________________________________________________

Digital Image Watermarking using Spread Spectrum Technique under DWT Domain

International journal of engineering research and technology, 2014

In the recent few years, it has become a daily need to distribute digital images as a part of widespread multimedia technology by means of the World Wide Web. Digital Image Watermarking techniques have been developed to protect digital images from illegal reproductions and illegal modifications. So these techniques have developed widely to maintain the broadcasting media and content authentication, broadcast monitoring, tamper detection, copyright protection, and many other applications. This paper highlights a new scheme for Digital Image Watermarking using Spread Spectrum Technique under DWT Domain. It starts with the general watermarking procedure, the attributes and applications of Digital Image Watermarking and attacks on Digital Image Watermarking. Moreover, the experimental results showed that the proposed scheme provides better quality of watermarked images in terms of watermark invisibility to human eyes and low data payload during embedding and extraction process. In addition, some possible attacks on watermarked images are discussed. To check the Imperceptibility and Robustness, Peak Signal Noise Ratio (PSNR) is being used.

Improving spread spectrum based image watermarking through non-binary channel coding

2001

In this paper, we investigated on how to combine M-ary modulation with shortened Reed-Solomon (RS) codes, in the context of spatial spread spectrum based watermarking schemes. Analytical expressions and bounds for the bit error rate are derived and compared with empirical results for several types of images. It is shown that, for low output error rates, there exists an improvement in performance using both concepts simultaneously. It will be also demonstrated that, in general, the resulting efficiency in watermarking detection outperforms binary BCH codes used in conjunction with binary signaling. The effectiveness of concatenating M-ary modulation with RS codes is also assessed under JPEG compression for still images and MPEG-2 compression for video sequences.

High Payload Lossless Digital Image Watermarking Using Integer Wavelet Transform

2012

In this paper a high payload lossless digital image watermarking technique based on Integer Wavelet Transform is proposed. Digital watermarking is the process of embedding the watermark image into a host image which is imperceptible by human visual system. The small deviations in data values are not allowed in certain images for obvious reasons and a potential risk of a person misinterpreting an image. After extracting the embedded data, the original image should be recovered from watermarked image. A preprocessing histogram adjustment is used to prevent overflow/underflow. In proposed technique, the data are embedded into one or more bit planes of wavelet coefficients of high frequency sub bands. This technique embeds much more data imperceptibly than the existing techniques. The experimental results have demonstrated the superiority of the proposed method over existing techniques.