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A simple and effective audio watermarking algorithm based in time domain is proposed in this paper for controlling the unauthorized distribution of copyright audio. The algorithm makes use of the advantages of both embedding a watermark bit to an individual sample and embedding a bit to a group or frame of samples. Here, a frame of three positive valued samples is used to define the amount of distortion...
In this paper we introduce a robust image-adaptive data hiding in wavelet domain that hide data in images while imposing minimal perceptual degradation in original image. As it is well accepted, data embedding in the low and mid frequency parts of an image have better robustness under compression attacks than high frequency parts. So our method embeds more data in low frequency coefficients than high...
A novel blind digital image watermarking scheme based on Schur factorization in contourlet domain is proposed in this paper. Firstly, the original cover image is decomposed by contourlet domain, then Schur factorization is adopted to the selected symmetric blocks determined by the lowpass subband where watermark information is embedded. Additionally, the watermark image is encrypted by a pseudorandom...
We present a novel blind digital watermarking algorithm using the quantization for Jaguwen rubbing image based on Contourlet transform in this paper. After Contourlet transform, original image is decomposed into a series of multiscale, local and directional subimages. Select the low frequency subband as the watermarking embedding domain. At the same time, the original binary watermark is firstly scrambled...
Compared with wavelet, tight frame let has good time-frequency analysis ability. In this paper, we propose anew digital image watermarking algorithm based on tight frame let. In our method, the host image is firstly decomposed by frame let. Secondly, the watermark image is transformed by Arnold scrambling and then is embedded in the lowest frequency sub band of the host image. Experimental results...
We present a blind digital watermarking algorithm using the module arithmetic and odd-even quantization based on Contourlet transform in this paper. After Contourlet transform, original image is decomposed into a series of multiscale, local and directional subimages. Select the low frequency sub-band as the watermarking embedding domain and then make module arithmetic. At the same time, the original...
The natural preserve transform (NPT) has been presented as a tool for fuzzy logic watermarking. This paper describes a new image watermarking technique based on naturalness preserving transform (NPT). The proposed watermarking scheme uses NPT to encode a gray scale watermarking logo image or text, into a host image at any location. This paper presents efficient non-blind and quasi-blind watermark...
This paper proposes a novel anti-geometrical attacks digital image watermarking scheme. In the scheme, a kind of template watermark is proposed, and we embed template watermark as well as robust watermark into images. The template watermark is designed to detect the geometrical transformation, and the robust watermark is used for labeling the copyright. Given a disputed digital image, we first implement...
This paper presents an adaptive JPEG2000 compressed domain watermarking algorithm wherein the rich codestream syntax of the JPEG2000 standard is fully utilized. Firstly, the watermark embedding location is determined by the information contents (IC's for short) of the wavelet subbands, which is defined as the numbers of bytes that JPEG2000 spends to encode corresponding subbands. Then, a reference...
A color image watermarking algorithm based on 2-D cepstrum transform is proposed. The proposed method inserts a gray scale image into a color host image. Experimental results show that the proposed algorithm can survive affine transformation, JPEG compression, median filtering, rescaling, rotation, cropping and noise attacks.
In order to improve the invisibility and the robustness of semi-fragile watermarking, the paper first brings up the idea which embedding watermark based on the attackspsila characteristic, brings forward the region segmentation operator and the double-step embedding method. The paper puts forward the characteristic and its representation in DWT transform domain based on visual features model, and...
In this paper, we proposed a new non blind robust digital watermarking algorithm for embedding binary image watermark in grayscale images. For embedding procedure, three levels discrete wavelet transform of cover image is computed. Afterward the watermark image is added in the high-high (HH), low-high (LH) and high-low (HL) subbands using a threshold coefficients. The low-low (LL) subband coefficients...
In this paper, we propose a hybrid robust digital watermarking algorithm based on singular value decomposition (SVD) and lifting wavelet transform (LWT). In contrast to other watermarking algorithms based on wavelet transforms which exploit the human visual system (HVS), proposed method does not require to use HVS characteristics. After decomposing the cover image into a two-level lifting wavelet...
In this paper we present a blind low frequency watermarking scheme on gray level images, which is based on DCT transform and spread spectrum communications technique. We compute the DCT of non overlapping 8times8 blocks of the hostimage, then using the DC coefficients of each block we construct a low-resolution approximation image. We apply block based DCT on this approximation image, then a pseudo...
In this paper, a robust watermarking scheme for digital audio signal is proposed. The watermarks are embedded into the low frequency coefficients in discrete multiwavelet transform domain to achieve robust performance against common signal processing procedures and compression. The embedding technique is based on quantization process which does not require the original audio signal in the watermark...
A new method for digital video watermarking is presented in this paper. For data embedding we use 3-D ridgelet domain introduced by Helbert. The redundancy of this transform is substantial, so extraction of the hidden data is impossible in this domain. To overcome this problem, we introduce a modified ridgelet transform with little redundancy, and embed watermark in this domain. Experimental results...
Based on the good characteristics of dual-tree complex wavelet transform (DT-CWT), an improved digital watermarking algorithm is presented in the paper. The algorithm improves the embedding scheme by selecting the embedding channels and using the visual masking of HVS. In order to increase the robustness against common attacks such as JPEG, JPEG2000 compressions, different filtering attack etc., this...
Based on the improved Watson's model, an adaptive spread-transform dither modulation (ASTDM) algorithm is proposed for efficient color image watermarking. The luminance masking threshold is modified to be consistent with amplitude without affecting the original parameters. Then, by incorporating the improved model with STDM, we achieve a maximum labeling strength and an appropriate quantization step-size...
In this paper, a new multiplicative image watermarking system is presented. As human visual system is less sensitive to the image edges, watermarking is applied in the contourlet domain, which represents image edges sparsely. In the presented scheme, watermark data is embedded in the most energetic directional subband. By modeling general gaussian distribution (GGD) for the contourlet coefficients,...
This paper presents an algorithm of digital watermark embedding in the middle frequency adaptively based on the DCT domain. According to the energy of the block size after transforming, the algorithm can select the middle frequency coefficient adaptively to do embedding operation. Compared with traditional DCT domain fixed-point algorithm, it reachs a better balance of robust and watermark information...
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