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Semi-fragile watermark has attracted attention due to its important role in content authentication for multimedia. In order to distinguish malicious tampering from incidental attacks, semi-fragile watermark must be robust against content-protection image processing. Due to the widely use of JPEG compression, it is always an important subject of semi-fragile watermarking research to improve the performance...
Digital watermarking, in conjunction with cryptography, is one of the two major categories for information security. Unlike cryptography that the encrypted information represents like noisy patterns, by using watermarking, the watermarked contents look almost identical to its original counterpart, while it still retains the capability to counteract intentional signal processing by others and keeps...
The rapid growth of digital multimedia and Internet technologies have brought big challenge to copyright protection. Billions of dollars are lost every year because of illegal use of digital products. Digital watermarking is an effective method of copyright protection. Recently, watermarking in wavelet domain turns into an active research direction due to the multiresolution property of wavelet transform...
A novel adaptive watermarking algorithm is presented in this paper. At the same time, how to transplant this watermarking system to the DSP platform was introduced. The watermarking scheme is based on image wavelet transform domain. First, we decompose the carrier image into 4 sub-bands. Then according to HVS, we adaptively select some low frequencies coefficients to embed watermark data. For the...
The work concerns with an improving watermarking algorithm that embeds binary image data invisibly into an original image based on discrete wavelet transform (DWT). According to the HVS, the proposed algorithm embeds a watermark into the proper coefficients of sub-bands LH2, HL2 and LL2 of an image. In order to blindly extract the watermark, we insert the watermark by using quantized modulation strategy...
The effect of quantization based compression in quality scalable image coding on the robustness of wavelet based watermarking is presented. The non-blind direct modification type watermarking is considered for the analysis presented in this paper. First we present the analysis considering any quantization parameter and then restrict it to the integer powers of two to model the bit-plane discarding...
In order to implement watermarking scheme for embedded systems, we present an energy efficient and robust watermarking mechanism based on DS-CDMA. The DS-CDMA based watermarking can obtain the capacity according to the orthogonal spreading codes. The high capacity can improve the robustness efficiently. For power saving, we propose a low complexity frequency domain transform for the DS-CDMA embedding...
Multipurpose image watermarking algorithms can achieve the goal of content authentication and copyright protection simultaneously. In this paper, we propose a wavelet tree based blind watermarking algorithm using contrast level transformation. The wavelet coefficients of the host image are grouped into trees. The robust watermark and the semi-fragile watermark are embedded by quantizing one tree and...
The MPEG-7 standard offers a comprehensive set of audiovisual content Description Tools to support applications enabling effective and efficient access to multimedia content. MPEG recently identified a need for a set of new, unique descriptors necessary for detection of duplicate or derived visual media content. The MPEG-7 Visual Signature Tools are characterized by efficient detection at low false...
Based on the research of the current image information hiding theories, a type of image information hiding design based on DCT transform is presented. This program changes the DC coefficient of the DCT domain, ensures the right embedded secret information in the premise of non-visual distortion, through Amold transform establishes reference scrambling matrix, which enhances the robustness and security...
Among approaches in implementing digital rights management, image fingerprinting technique is considered to be one of the most attractive solutions, especially in detecting illegal use of image works. The deficiency of the existing image fingerprinting methods is that they can not deal with geometric transformations, such as aspect ratio changes, rotations, cropping, combining, etc. Aiming at this...
In this paper, a novel blind watermarking scheme for still image based on the two-dimensional discrete wavelet transform (DWT) is proposed. In the scheme, digital watermarking with a pseudo-random sequence is derived from a full logistic map system, and the robustness is achieved by embedding every bit of watermark sequence several times in many different locations in approximate sub-band of one-level...
Watermarking techniques are proposed as a solution to copyright protection of digital media files. Watermarking algorithms are mainly concentrated on spatial or spectral domains. In this work, a robust and high capacity watermarking method that is based on spatio-frequency (SF) representations is presented. We use the discrete evolutionary transform (DET) calculated by Gabor expansion to represent...
In this paper, a novel robust watermarking technique based on discrete cosine transform using genetic algorithm (GA) is presented. To obtain highest possible robustness without losing transparency, GA is used for adjustment of mid-band coefficients. Significant improvements in robustness under attacks and also in transparency are obtained from experimental results.
Digital watermarking has been proposed as a method for discouragement of illegal copying and distribution of copyrighted material. Currently proposed algorithms of digital watermarking in the context of the video are robust against unintentional attacks, but many of them do not protect enough against malicious attacks. This paper presents a new video watermarking system with improved robustness, which...
In this paper, we propose to use Alamouti's orthogonal space-time block code to improve the performance and the robustness of the spread spectrum watermarking systems. After employing a space-time block code, we embed the coded watermark sequence into the host image in discrete wavelet transform domain. Simulation results show that the use of the space-time block codes considerably increases the robustness...
A novel image perceptual hashing algorithm is proposed on the intermediate hashing stage. It first uses an iterative geometric technique to extract significant geometry preserving feature points. Then, the fuzzy distance matching method is proposed based on the observation that the distances of feature points are invariant in the polar coordinate under arbitrary rotation. It is verified that the proposed...
A novel framework is presented for image watermarking, which enables detection of the watermark without the original image. As opposed to earlier DCT-based subsampling method that reconstructed the image before transmission, the new DWT-based framework allows validation of the watermark before the recovery of the image. This reduces computational requirements in situation when the verification step...
In this paper, a new and efficient descriptor for region-based shape representation and retrieval is presented. The proposed descriptor called sub-area shape matrix which is obtained based on the circular raster sampling technique and the axis of least inertia. An element of the sub-area shape matrix is obtained as the sum of pixel values on the region of the shape image enclosed by two neighboring...
A new method of blind watermarking for video is proposed for retrieving watermarks from MPEG bit streams directly without decoding. This method is based on Sakazawa's method which also aims at retrieving from MPEG bit streams, but realizes embedding and retrieval without specifying the location of the DCT blocks to be embedded. This method does not care about the location of the embedded block. Moreover,...
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