In this paper, based on generalized Arnold Transform (GAT), a novel image zero-watermarking scheme with spread spectrum and despreading (SSD) techniques is presented by using spatial domain of watermark image. GAT is obtained by adding number of variables, and SSD is introduced from communication field to deal with pixels of watermark image. First of all, GAT is used to scramble an original wat...

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 a digital watermarking scheme, it is not convenient to carry the original image all the time in order to detect the owner’s signature from the watermarked image. Moreover, for those applications that require different watermark for different copies, it is preferred to utilize some kind of watermark-independent algorithm in extraction (does not need a priori knowledge of the watermark). In th...

In this paper, we propose watermark design patterns to model the characteristic of digital watermark in electronic commerce applications. A watermark design pattern preserves the properties of a digital watermark in binary tree representation. Applying the survey results and characteristics of existing watermarking techniques, watermark design patterns for four media data video, image, audio, a...

Three novel blind watermarking techniques are proposed to embed watermarks into digital images for different purposes. The watermarks are designed to be decoded or detected without the original images. The first one, called single watermark embedding (SWE), is used to embed a watermark bit sequence into digital images using two secret keys. The second technique, called multiple watermark embedd...

With the development of Internet and databases application techniques, the demand that lots of databases in the Internet are permitted to remote query and access for authorized users becomes common, and the problem that how to protect the copyright of relational databases arises. This paper simply introduces the knowledge of cloud model firstly, includes cloud generators and similar cloud. And ...

A drawback of most watermarking techniques is the need for some additional information in order to retrieve the watermark. Additionally, the robustness of the watermark decreases as the number of information bits stored in the image increases. We present a Watermarking technique which requires no information for decoding in addition to the watermarked image. The watermark is multi-level with fe...

Geometric attacks can desynchronize the location of the watermark and hence cause incorrect watermark detection. This paper presents a robust colour image watermarking scheme based on visually significant feature points and image normalization technique. The feature points are used as synchronization marks between watermark embedding and detection. The watermark is embedded into the non overlap...

Digital videos become more and more popular, meanwhile, the illegal usages and distribution also grow as well. It also arise another problems such as users can copy vast amount of digital data at will. Watermark is a logo belongs to the owner and watermarking is the technique which is created for protecting the copyright. The watermark can be embedded and hidden into the owner’s video products....

This paper proposes a new image watermarking technique, which adopts Independent Component Analysis (ICA) for watermark detection and extraction process (i.e., dewatermarking). Watermark embedding is performed in the spatial domain of the original image. Watermark can be successfully detected during the Principle Component Analysis (PCA) whitening stage. A nonlinear robust batch ICA algorithm, ...