This paper proposes a novel high capacity audio watermarking algorithm to embed data and extract it in a bit-exact manner based on changing the magnitudes of the FFT spectrum. The key idea is to divide the FFT spectrum into short frames and change the magnitude value of the FFT samples based on the average of the samples of each frame. Using the average of FFT magnitudes makes it possible to im...

This paper explores the morphosyntactic tools for text watermarking and develops a syntax-based natural language watermarking scheme. Turkish, an agglutinative language, provides a good ground for the syntax-based natural language watermarking with its relatively free word order possibilities and rich repertoire of morphosyntactic structures. The unmarked text is first transformed into a syntac...

This paper continues our researches on reversible watermarking. The main contribution of this paper is the investigation of image distortion control methods. Two methods are proposed. The first one does not modify pixels which generate an error greater than a predefined threshold. Tuning the error, the image quality versus the hiding capacity is controlled. The second method limits the maximum ...

Digital Watermarking technique is used to embed the useful information in a transmission media for copyright protection, authentication and broadcast monitoring etc. This paper describes an image hiding method using Fast Fourier Transform (FFT) algorithm which calculates the Peak Signal to Noise Ratio (PSNR) values and compare them with Gray Scale and Discrete Cosine Transform (DCT). The experi...

Most work on watermarking has resulted in techniques for different types of data: image, audio, video, text/language, software, etc. In this paper we discuss the watermarking of abstract structured aggregates of multiple types of content, such as multi-type/media documents. These semi-structures can be usually represented as graphs and are characterized by value lying both in the structure and ...

Reversible video watermarking can guarantee that the original watermark and the original frame can be recovered from the watermarked frame without any distortion. Although reversible video watermarking has successfully been applied in multimedia, but its application has not been extensively explored in medical videos. Reversible watermarking in medical videos is still a challenging problem. The...

In this paper, a theoretical framework for image watermark capacity estimation is derived. We present one general watermarking embedding scheme which is based on unitary transforms and adapts the additive watermarking model. In this general frame, simple and elegant formulas about the relationship of robustness and imperceptibility are derived. Hence a direct link between watermark capacity and...

A blind watermarking technique embedding a digital image signature for authentication is developed. The signature algorithm is rst implemented in the discrete wavelet transform (DWT) domain and is later coupled within the SPIHT compression algorithm. The capacity of the watermarking method is determined by the upper bound on the attainable information bit rate that can be hidden in the image us...

Watermarking is a technique that is used in copyright–protection for valuable medias. Watermarking is measured by four quantities: capacity, security, robustness, and imperceptibility. In this study, robustness of five watermarking algorithms will be assessed. The study will also lightly touch on imperceptibility characteristics of the algorithms. The five algorithms are CDMA Spatial Domain Spr...

Digital watermarking, traditionally modeled as communication with side information, is generally considered to have important potential applications in various scenarios such as digital rights managements. However, the current literature mainly focuses on robustness, capacity and imperceptibility. There lacks systematic formal approach in tackling secure issues of watermarking. One one hand, th...