A new robust watermarking scheme for protection of document image contents using redundant watermark segments is proposed in this work. A wavelet-based watermarking scheme for embedding a logo has been developed for robust watermarking. At the sender side, a level-2 wavelet transformation is applied on the source document image. LL-sub-band of level-2 of the transformed image is subdivided into...

Recently, digital contents are copied easily because of the development of digital technology. So digital watermark technique which aims at copyright protection of digital contents becomes more and more important, and various watermarking methods have been proposed. In this paper, we proposed a method of digital watermark for still image by using wavelet packets, and examine the robustness of t...

This paper proposes an approach for the combined image authentication and compression of color images by making use of a digital watermarking and data hiding framework. The digital watermark is comprised of two components: a soft-authenticator watermark for authentication and tamper assessment of the given image, and a chrominance watermark employed to improve the efficiency of compression. The...

With the explosion of multimedia content over Internet, there is a need for copyright protection of digital content. Whether it is music albums swapped over peer to peer networks or video files uploaded over websites such as YouTube.com or 3D models such as Shrek, artists need to protect their ownership of content. 3D Watermarking provides a deterrent to piracy of 3D models by embedding a hidde...

We introduce the concept of augmented watermarking in which in addition to the hidden watermark placed within the image an explicit watermark-dependent random sequence (noise) is added to it. The receiver first detects the watermark, computes the random sequence for which the watermark serves as the seed, and then subtracts out this random sequence. This system can be devised with several water...

This paper presents two digital watermarking schemes for embedding a grayscale watermark into color images. The first embeds the watermark directly into the spatial domain while the other embeds the watermark after converting to the DCT Domain. In both schemes, following the pixel modification, the watermark is redirected into the saturation component of the image. The original image is needed ...

We describe an electro-optical method of deciphering a watermark from a recently invented encoded image termed a concealogram. The watermark is revealed as a result of spatial correlation between two concealograms, one containing the watermark and the other containing the deciphering key. The two are placed side by side on the input plane of a modified joint-transform correlator. When the input...

Human visual system (HVS) models have been used in digital watermarking to minimize the visual effects of the watermark while increasing the strength of watermark. Such work has been applied to different watermarking schemes with varying degrees of success. Previous work at Digimarc resulted in a HVS model that inserts a high watermark signal in busy or high contrast areas, while reducing the w...

In this paper we propose a new watermarking scheme for digital images that allows watermark recovery even if the image has been subjected to generalized geometrical transforms. The watermark is given by a binary number and every watermark bit is represented by a two dimensional function. The functions are weighted, using a mask that is proportional to the luminance, and then modulated onto the ...

In this paper, a novel asymmetric public-key watermarking scheme is proposed. The watermark is embedded with the use of a private key, while the decoding uses only simple public key. The asymmetric watermark carries certain number of bits of information. However, neither the knowledge of a public key, nor the knowledge of the hidden information, does not allow the attacker to remove the waterma...