Abstract Nowadays, multimedia security is a major issue. Images, video, audio, and text files lose credibility in most times, because they face several attacks related to illegal distribution, duplication, manipulation of the information conveyed by them. Digital watermarking an important tool for protecting digital content. This paper introduces efficient hybrid image scheme. It consists two s...

A kind of image digital watermarking scheme is proposed in this paper. The scheme is based on Fast Independent Component Analysis (Fast ICA) and Discrete Wavelet Transform (DWT). In this scheme, a binary image is embedded into a wavelet approach sub-image. When extracting the watermarking, Fast ICA method is used. The experiment results show that the scheme is robust to many attacks. Keyword— B...

We propose an asymmetric fragile watermarking technique that uses a number theoretic transform (NTT). Signature data is extracted from a watermarked image by determining correlation functions that are computed using the NTT. The effectiveness of the proposed method is evaluated by simulated detection of altering. key words: number theoretic transform, asymmetric watermarking, fragile watermarki...

An overview of reversible watermarking techniques appeared in literature during the last five. Digital watermarking techniques have been indicated so far.reversible watermarking, reflecting recent progress, and provide some. reversible watermarking Figure 1: Flowcharts of conventional and reversible watermarking schemes process.from other types of digital watermarks, a reversible watermark has ...

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 ...

In this paper a wavelet-based logo watermarking scheme is presented. The logo watermark is embedded into all sub-blocks of the LLn sub-band of the transformed host image, using quantization technique. Extracted logos from all sub-blocks are merged to make the extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet tra...

A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio or image data. It is typically used to identify ownership of the copyright of such signal. In this paper, I present review on Image Watermarking .Here, I discuss the various factors used in watermarking techniques, attacks, and security and application area where watermarking technique can be used...

As the dissemination of images grows across the internet, authentication of images is becoming an important research issue. Image watermarking techniques are the most used forms to authenticate an image, however they introduce distortions in the original image and are vulnerable to a multitude of attacks. In this paper we present a novel method to authenticate images. We propose that instead of...