Digital watermarking has been utilized widely to claim the ownership and to protect images from alternation. Reversible watermarking is having great importance as it provided original image and the embedded logo without any loss. This paper proposed reversible watermarking algorithm using integer wavelet transform to satisfy the reversibility requirement. Further difference expansion based lift...

Recently, chaos based mapping has widely been applied for image watermarking due to their inherent cryptographic features. Fractals are one of the robust techniques used for image compression. When a Chaotic map is used in conjunction with Fractal-Wavelet, efficiency may be improved in the process of image watermarking. In this paper, Chaos based watermarking method is proposed in cascade with ...

An entirely novel approach to image indexing is presented using content-based watermarking. The proposed system uses colorimage segmentation and watermarking in order to facilitate content-based indexing, retrieval and manipulation of digital images and image regions. A novel segmentation algorithm is applied on reduced images and the resulting segmentation mask is embedded in the image using w...

Embedding a hidden stream of bits in a file is called Digital Watermarking. The file could be an image, audio, video or text. Nowadays, digital watermarking has many applications such as broadcast monitoring, owner identification, proof of ownership, transaction tracking, content authentication, copy control, device control, and file reconstruction (Cox et. al., 2008). In literature, the host f...

A repeating watermarking technique based on visual secret sharing (VSS) scheme provides the watermark repeated throughout the image for avoiding the image cropping. In this paper, the watermark is divided into public watermark and secret watermark by using the VSS scheme to improve the security of the proposed watermarking technique. Unlike the traditional methods, the original watermark does n...

In scalable image/video coding, high resolution content is encoded to the highest visual quality and the bit-streams are adapted to cater various communication channels, display devices and usage requirements. These content adaptations, which include quality, resolution and frame rate scaling may also affect the content protection data, such as, watermarks and are considered as a potential wate...

In this report we present our work for colour image watermarking in different domains. First we consider mobile applications of watermarking and their properties. We implement a watermark into multimedia message and extract it. Using a set of observers we study image quality changes. Interesting results were found for human vision sensitivity to image type. Then we extend watermarking technique...

Digital watermarking is a technique for copyright protection. In literature, many watermarking methods for gray images have been presented. Some of them are directly applied to the luminance component of a color image. A previous method applies to the difference between RGB components instead, and shows that the image quality can be improved. In this paper, we present a robust color image water...

Due to large amount of frames, similarity between frames and temporal attacks (frame dropping, frame averaging, frame swapping etc.), video watermarking process is more difficult than image watermarking. Current image watermarking methods are not adequate to solve these difficulties. We propose a novel uncompressed video watermarking system based on Hidden Markov Model (HMM) and Artificial Neur...

Nowadays, the issue of protecting copyrights of digital contents has become very much critical owing to the swift growth of the Internet. Protecting the high-value digital assets and controlling the distribution and usage of those digital assets are the tasks of the Digital Rights Management (DRM) system. Watermarking technologies are being looked upon as promising means to safe guard the copyr...