This paper proposes an approach for embedding two watermarks into fingerprint images using the Discrete Cosine Transform (DCT) algorithm. The main aim of the proposed algorithm is to add more authentication factors based on the watermark messages and to protect the ownership of the fingerprint image. Since the information used for identification or verification of a fingerprint image mainly lie...

An important element of a communications system is the trustworthiness of the data being received, especially where the data must travel through insecure channels or pass through several hands. Digital watermarking provides a partial solution to the problem of trustworthiness, especially with regard to image and video data. This paper describes a hybrid watermarking algorithm that combines robu...

A new method for digital image watermarking which does not require the original image for watermark detection is presented. Assuming that we are using a transform domain spread spectrum watermarking scheme, it is important to add the watermark in select coefficients with significant image energy in the transform domain in order to ensure non-erasability of the watermark. Previous methods, which...

One of the most important practical problems of blind Digital Watermarking is the resistance against desynchronization attacks, one of which is the Stirmark random bending attack in the case of image watermarking. Recently, new blind digital watermarking schemes have been proposed which do not suffer from host-signal interference. One of these quantization based watermarking scheme is the Scala...

This paper presents an efficient and low-cost solution to apply digital watermarking technology to online multimedia distribution and commerce. This solution consists of a hierarchical watermarking scheme and two types of automatic low-cost watermark enforcement tools: watermark monitor and watermark tracking agent.

communication theory tool sets based on diversity and channel estimation improves the performance of robust digital watermarking algorithms. This article demonstrates that algorithms employing some form of watermark redundancy can be significantly enhanced. It also discusses effective data-hiding strategies within the proposed framework and reports on the results of robust reference watermarkin...

In digital watermarking, a watermark is embedded into a covertext in such a way that the resulting watermarked signal is robust to certain distortion caused by either standard data processing in a friendly environment or malicious attacks in an unfriendly environment. The watermarked signal can then be used for different purposes ranging from copyright protection, data authentication, fingerpri...

We propose a multidimensional coupled chaotic map as a pseudo random number generator. Based on the introduced dynamical systems, a robust watermark scheme for copyright protection is proposed. By modifying the original image in transform domain and embedding a watermark in the difference values between the original image, the proposed scheme overcomes the weak robustness problem of embedding a...

Digital watermarking in medical images can ensure the authenticity and integrity of the image. This design paper reviews some existing watermarking schemes and proposes a reversible tamper detection and recovery watermarking scheme. Watermark data from ROI (Region Of Interest) are stored in RONI (Region Of Non Interest). The embedded watermark allows tampering detection and tampered image recov...

This study proposes a blind watermarking algorithm based on Double Haar Wavelet Transform (DHWT) for copyright protection of digital images. Watermark embedding is performed in wavelet transform domain. DHWT is applied to the original cover image and binary watermark. Singular value decomposition (SVD) is applied on selected subband of cover image and binary watermark. Eigen values of selected ...