A novel image authentication algorithm resisting to JPEG compression is proposed. The authentication watermark is generated based on the stability of relationship of adjacent Contourlet transform coefficients before and after JPEG. According to the random block mapping, the watermark is embedded into the discrete cosine transform (DCT) coefficients of other image blocks. The tampering identific...

t Abstract.Thenewembeddingmethodofannotationsintorasterimagesispresentedinthearticle.Themethod combines the principles of watermarking and steganography. Using the method proposed it is possible to attach the information to the raster image and bind it to a specified object or region of the image. The JPEG2000 raster images coding standard is used as base to realize the embedding and extracting...

This paper proposes a novel watermarking algorithm of 3D CAD product model, which is able to keep strictly geometrical shape around embedding watermark and make watermarked model have function transparency. Firstly, the isolated geometrical entities are selected as watermark carriers. Secondly, the watermark is embedded into the isolated geometrical entities with a geometric entity substitution...

This paper deals with the watermarking of audio speech signals which consists in introducing an imperceptible mark in a signal. To this end, we suggest to use an amplitude modulated signal that mimics a formantic structure present in the signal. This allows to exploit the time–masking effect occurring when two signals are close in the time–frequency plane. From this embedding scheme, a watermar...

We propose a watermarking scheme to hide copyright information in an image. The scheme employs visual masking to guarantee that the embedded watermark is invisible and to maximize the robustness of the hidden data. The watermark is constructed for arbitrary image blocks by ltering a pseudo-noise sequence (author id) with a lter that approximates the frequency masking characteristics of the visu...

In this paper, an informed audio watermarking scheme using chaotic waveforms is proposed. The watermark consists of an attenuated signal embedded in the original audio signal. A modulation scheme based on vector quantization is used to achieve blind detection of the watermark signal. A method for self-synchronization of the watermark detector is proposed using chaotic orthogonal waveforms. A pe...

Standard spread spectrum audio watermarking algorithms offer BER unacceptable for reliable transmission of data. Causes of unreliable watermark detection are often attacks that distort the watermarked audio in fading-like manner, disabling the correlation-based detectors to extract data. In this paper, consideration of capacity of the audio watermark channel in the presence of fading-like disto...

To protect the patient information in medical images, this article proposes a robust watermarking algorithm for images based on Harris-SURF-DCT. First, corners of image are extracted using Harris corner detection algorithm, and then, previously described method describing feature points SURF to generate descriptor matrix. Then, matrix is processed through perceptual hash obtain vector image, wh...

This paper deals with the testing of the robustness of two algorithms for embedding and extraction of digital watermark into a monochromatic image, based on SVD transformation. The first algorithm was proposed by Liu and Tan [1], and the second, named Technique 1, was proposed by Mohammad et al. [3]. In the first part of the paper, the influence of the watermark contents on the the image for bo...