Abstract: This paper presents a novel algorithm for blind watermarking still images in the DCT domain with advanced features. Nine AC values will be modulated to implant an encrypted watermark. Eight of them represent one byte of the useful data to be hidden and the ninth bit represents a key that will be used to scramble the message. Hence, the capacity of insertion is increased by 60% while p...

Hiding data in images in an imperceptible but robust way relies on choosing the locations for hiding according to psychophysical measures. The locations may be represented as an image expressing the steganographic capacity in the diierent areas. i.e. how much the area may be changed without changing the visual appearance of it. Only a few algorithms for computing capacity are found in the liter...

In this paper, we propose two blind adaptive audio watermarking schemes based on complex cepstrum transform (CCT) domain features. In first scheme (SchemeI), each audio segment is divided into two subsets having approximately same statistical mean value using down-sampling method. Since the human auditory system (HAS) is not much sensitive to the minute change of the wavelet high-frequency comp...

The recent progress in the digital multimedia technologies has offered many facilities in the transmission, reproduction and manipulation of data. However, this advancement has also brought the challenge such as copyright protection for content providers. Digital watermarking is one of the proposed solutions for copyright protection of multimedia data. This technique is better than Digital Sign...

a watermarking scheme for Grayscale image isproposed based on a family of the chaotic maps and discretecosine transform. Jacobian Elliptic mapis employed to encrypt ofwatermarked logo. Piecewise nonlinear chaotic map is also usedto determine the location of DCT coefficients for the watermarkembedding. The purpose of this algorithm is to improve theshortcoming of watermarking such as small key s...

Watermarking is an operation to hide important information. In this paper, a new watermarking algorithm using Shearlet transform and GWO optimization algorithm as well as SVD transform is presented. The results of this paper show the improvement of robustness and transparency of the new algorithm.

Watermarking has increased dramatically in recent years in the Internet and digital media. Watermarking is one of the powerful tools to protect copyright. Local image features have been widely used in watermarking techniques based on feature points. In various papers, the invariance feature has been used to obtain the robustness against attacks. The purpose of this research was based on local f...

This paper presents secure and high capacity watermarking technique using novel approach of Image Partitioning-Merging Scheme (IPMS). The IPMS is used as reduction method to reduce the size of watermark logically and increases security levels of proposed watermarking technique. The technique effectively uses special properties of Discrete Wavelet Transform (DWT), Fast Walse Hadamrd Transform (F...

Watermarking is a technique that consists in hiding/embedding binary information within a signal in an imperceptibly way, meaning in the present context of audio signals that the mark is inaudible. Watermarking was first used for the protection of digital contents as part of the DRM (Digital Rights Management). In this context of secured applications, important efforts were devoted to ensure ro...

Two-dimensional (2D) barcode has improved the information encoded capacity, and it also has enriched the applications of barcode technique. Recently, there are researches dealing with watermark technique on 2D barcode to prevent it from counterfeited or prepensely tampered. The existent methods still have to limit the size of embedded watermark in a relatively small portion. Furthermore, it als...