Print-scan resilient watermarking has emerged as an attractive way for document security. This paper proposes a stroke direction modulation technique for watermarking in Chinese text images. The watermark produced by the idea offers robustness to print-photocopyscan, yet provides relatively high embedding capacity without losing the transparency. During the embedding phase, the angles of rotata...

We present a hybrid approach to image watermarking that exploits results from both information theory and perceptual studies. Towards this purpose we use a waterfilling-type algorithm to establish a connection between information theoretic and perceptually based watermarking. Information theoretic capacity formula for a Gaussian signal over a Gaussian channel is used and some parameters of the ...

K.Hari Babu, IJECS Volume 2 Issue 11 November, 2013 Page No. 3192-3196 Page 3192 Abstract— This paper proposes a high capacity reversible image watermarking scheme based on integer wavelet transforms. The proposed scheme divides an input image into non-overlapping blocks and embeds a watermark into the high frequency wavelet coefficients of each block. The conditions to avoid both underflow and...

High-capacity image watermarking scheme aims at maximize bit rate of hiding information, neither eliciting perceptible image distortion nor facilitating special watermark attack. Texture, in preattentive vision, delivers itself by concise high-order statistics, and holds high capacity for watermark. However, traditional distortion constraint, e.g. just-noticeable-distortion (JND), cannot evalua...

Digital watermarking is referred to a method used for copyright protection and authentication. In this paper, we present a method of nested digital watermark embedding and extraction in which a nested watermark (a watermark inside another watermark) is embedded into the main image. This concept of nested watermarking is used to increase the watermark embedding capacity. In this method, a waterm...

In this paper, we address two ways of difference expansion based reversible DNA watermarking using noncoding DNA sequence. Unlike image data, the reversible DNA watermarking should consider the string structure of a DNA sequence, the organism functionality, the perfect recovery, and the high embedding capacity. We convert the string sequence of four characters in noncoding region to the decimal...

Information hiding is an emerging research area which includes applications such as copyright management [4], tamper detection and content authentication. Existing chaos optimization and random position selection based watermarking embedding methods make claims for robustness and reversibility; however, reversibility becomes questionable when data capacity is high. In a published paper, authors...

This paper discuss natural language watermarking, which analyzes patterns inside sentences of a given natural language text document, in order to embed individual watermark messages. The term ”natural language watermarking” stands for the process of the embedding of watermark messages into a text document, using natural language components as the carrier, in such a way that the modifications ar...

Copyright protection and authentication of digital contents have become a significant issue in the current digital epoch with efficient communication mediums such as Internet. Digital watermarking technique is now one of the hot research fields of copyright protection for CAD graphic data under the network environment. But there are very limited techniques available for that because of its high...

This paper proposes a reversible blind image watermarking scheme for digital images based on discrete fractional random transform (DFRT). Based on a patchwork watermarking scheme, the proposed algorithm utilizes histogram rotation to embed a binary watermark in DFRT domain with strong information security. To evaluate the performance of the proposed scheme, several experiments are configured fo...