Digital watermarking of multimedia content has been proposed as a method for different applications such as copyright protection, content authentication, transaction tracking and data hiding. In this thesis, we propose a lossless watermarking approach based on Discrete Cosine Transform (DCT) for a new application of watermarking. A depth map obtained from a stereoscopic image pair is embedded i...

one of the most favored way to lessen data complexity is to conceal details or redundant information. Watermarking is a technique which consists in inserting a robust and imperceptible brand in a host image, in order to defend it against illegal plagiarism. Being reversible, the watermarking information like numbers, texts and images can be embedded digital media formats such as Audio, Video an...

We consider the potential implications of recent developments in subfields of image analysis and image representation for watermarking and steganography. We consider three rapidly developing subfields: 1. Natural Scene Statistics; 2. Level Set Image Processing and Geometric Diffusion; and 3. Computational Harmonic Analysis. Each of these subfields has recently claimed progress either in charact...

This paper presents a robust watermarking technique for color and grayscale image. The proposed method involves many techniques to conform a secure and robust watermarking. In the proposed technique the watermark is embedded in 3 level of DWT (Discrete Wavelet Transform) and before embedding the watermark image is passed through chaotic encryption process for its security, other important thing...

Digital image manipulation software is now readily available on personal computers. It is therefore very simple to tamper with any image and make it available to others. Ensuring digital image security has therefore become a major issue. Watermarking has become a popular technique for copyright enforcement and image authentication. The aim of this paper is to present an overview of some possibl...

This paper presents a technique of digital image watermarking using DCT wavelet transform. Use of Haar wavelet is very common in watermarking. However, here DCT wavelet transform of size 256*256 is generated using existing well known orthogonal transform DCT of dimension 128*128 and 2*2. This DCT Wavelet transform is used in combination with the orthogonal transform DCT and SVD to increase the ...

Since 2000, many digital watermarking schemes for vector quantization (VQ)-compressed images have been proposed. Their main idea is to carry watermark information by VQ codeword indices. The advantage of this kind of watermarking schemes is its robustness to VQ compression with the same codebook. This Letter presents a more effective image watermarking method based on classified VQ. First, the ...

This paper presents an adaptive block sized reversible image watermarking scheme. A reversible watermarking approach recovers the original image from awatermarked image after extracting the embedded watermarks. Without loss of generality, the proposed scheme segments an image of size 2N ×2N adapccepted 12 November 2010 vailable online 19 November 2010

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. "Watermarking" is the process of hiding digital information in a carrier signal. Embedding a digital signal (audio, video or image) with information which cannot be removed easily is called digital watermark...