The objective of this work is to increase the capacity of watermark information in the audio watermarking method based on low-frequency amplitude modification. We increase the capacity of watermark information by embedding multiple watermarks in individual data channels.

Fragile watermarking has been proposed as a means of adding additional security or functionality to biometric systems, particularly for authentication and tamper detection. In this paper we describe an experimental study on the effect of watermarking iris images with a particular class of fragile algorithm, reversible algorithms, and the ability to correctly perform iris recognition. We investi...

In JPEG-to-JPEG image watermarking (J2J), the input is a JPEG image file. After watermark embedding, the image is JPEG-compressed such that the output file is also a JPEG file. In this paper, we use the human visual system (HVS) model to estimate the J2J data hiding capacity of JPEG images, or the maximum number of bits that can be embedded in JPEG-compressed images. Watson’s HVS model is modif...

Digital Image Watermarking is one of the ways to protect intellectual property right and copyright of the information owner. Fidelity, Capacity and Robustness are the important requirements of digital watermarking techniques, but these requirements compete with each other; if one is improved the other two are affected. This paper presents a combined approach of DWT, Chirp-Z and Fast Walsh-Hadam...

The air/ground voice communication between air traffic controller and aircraft does not provide any means of automatic speaker identification and is therefore susceptible to call sign confusion and originator ambiguity. In the near future the analogue VHF radio will not disappear from avionic communications. With an add-on to the analogue radio it is possible to automatically detect the origina...

The watermarking technique can be used to protect the ownership of relational databases by hiding some ownership information into the relational databases. In this paper, a novel robust reversible watermarking scheme for relational database protection is proposed to increase the embedding capacity by developing an improved histogram shifting with binary tree structure and an attribute selection...

Recently in the field of watermarking there are lots of facilities in communication, transmission and changes of data or information. There are lot of digital watermarking techniques have been made and implemented to stop the illegal use of the digital multimedia images or data. Robust and reversible watermarking technique is one of them. In this paper, we propose a reversible visible watermark...

Increasing production and exchange of multimedia content has increased the need for better protection of copyright by means of watermarking. Different methods have been proposed to satisfy the tradeoff between imperceptibility and robustness as two important characteristics in watermarking while maintaining proper data-embedding capacity. Many watermarking methods use image independent set of p...

Permanent distortion is one of the main drawbacks of all the irreversible watermarking schemes. Attempts to recover the original signal after the signal passing the authentication process are being made starting just a few years ago. Some common problems, such as salt-andpepper artefacts due to intensity wraparound and low embedding capacity, can now be resolved. However, we point out in this w...