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Information technology has eased the duplication, manipulation and distribution of digital data in recent times which has resulted in the demand for safe ownership of digital images. A very crucial concern for the content owners and distributors is copyright protection and content authentication. The solution to these problems is Digital Watermarking. The watermarking is the process of embedding a...
This paper proposes a novel watermarking algorithm that protects digital copyrights and is robust to attacks. The Algorithm contains two features: finding target subband based on energy and wetting adaptive quantization step-size. These features improve the robustness and preserve high audio quality. Watermarks are embedded in the subband including the significant part of the signal such as a pitch...
The research and application of semi-fragile digital watermark is being paid more and more attention now, especially for content authentification. We proposes a novel design for image content authentification based on semi-fragile digital watermark using side information, which combines the modern RSA public key encryption technique with communication principle just like spread spectrum technology...
Digital watermarking techniques have been used as one of the means for copyright protection and authentication of multimedia data. Conventional Singular Value Decomposition (SVD)-based and Chinese Remainder Theorem (CRT)-based spatial domain watermark techniques do not perform well under JPEG compression. However, it is seen that the CRT-based watermarking technique in Discrete Cosine Transform (DCT)...
The two main properties of digital watermarking algorithms for 2D vector data are robustness against attacks and minimization of the original data distortion. This paper proposes conformal energy as a measure of original data distortion to quantify the second property. We modify the watermarking algorithm proposed by Ohbuchi et al., which is, to the best of our knowledge, the most robust one against...
Piracy in the presence of internet and computers proves to be a biggest jolt to the concerned industry. To reduce the piracy and duplicity of the images, digital watermarking technique is having an edge over the other available techniques. In this paper, a blind digital watermarking algorithm is presented which is robust enough to resist the watermark against the attacks. The algorithm exploits the...
Based on wavelet and balanced multiwavelet transformation, a watermarking algorithm for gray image is proposed in this paper. First the low frequency area is obtained by decomposing the original image by wavelet, which is further decomposed by balanced multiwavelet. Then the high-frequency coefficients with highest scale are chosen as watermark embedded carrier. The normalization of gray watermarked...
This paper presents the novel multi-bit watermarking using adaptive embedding algorithms with minimum error. These embedding algorithms can embed multi-bit (k-bit, k>=1 ) logo data into cover data only introduce minimum embedding errors which are restricted to-(2^(k-1)-1) *2^(k-i)~+-(2^(k-1)-1) *2^(k-i) according to the embedding location i. To achieve the goal of minimum embedding error, we introduced...
In this paper, an attempt has been made to retrieve watermark same as original watermark using Cat Swarm Optimization (CSO) technique. Embedding watermarks in frequency domain can usually be achieved by modifying the Least Significant Bits (LSBs) of the transformation coefficients. The hidden watermark in an image is retrieved differently from the original watermark from the frequently used rounding...
Vector maps are valuable asset of geographic data producers. In this paper, we propose a new watermarking algorithm for vector maps based on Minimum Encasing Rectangle of the map. Minimum Encasing Rectangle is employed to keep synchronization when watermarks are embedded and detected due to its geometry invariance property. After gridding the map into cells based on MER and constructing grid weight...
This paper presents a new steganographic technique which demonstrates the colour image authentication process in frequency domain based on the Discrete Fourier Transformation (DFT). Image authentication is done by hiding secrete message/image into the transformed frequency component of source image. The DFT is applied on sub-image block called mask of size 2 × 2 in row major order. Secrete message/image...
In order to protect the intellectual property right of an image, this paper proposes a robust digital watermarking technology based on discrete cosine transform (DCT). It mainly uses the local average moment to modify specific AC values of each DCT block so as to embed the watermark. When the content of a digital image is modified or even possessed by others through the Internet, the creator can prove...
This paper proposes a robust blind watermarking scheme for 2D-vector data used in Geographical Information Systems (GIS). The proposed method embeds two types of watermarks that complement each other into the vector data. It preserves the fidelity of the vector data using an intersection test. Simulation results show that our method is resistant to common attacks such as translations, scaling, rotation,...
In this paper, a video watermark technique is proposed. The proposed technique depends on inserting invisible watermark in Low Frequency DCT domain using pseudo random number (PN) sequence generator for the video frames instead of high or mid band frequency components. This technique has been realized using Matlab and VHDL. The system has been implemented on Xilinx chip XC5VLX330T. The result of implementation...
Protecting images against illegal duplications is an important fact and recently many watermarking algorithms have been published. In this paper an enhanced SVD-based watermarking algorithm is proposed. In the proposed method U component is explored for embedding the watermark. Experimental results show that imperceptibility and robustness of the algorithm is good.
Data Embedding is an art of concealing information of high significance or secrecy inside an image or video sequence. Numerous techniques are being researched to develop a strong and optimized algorithm to embed the data so as to withstand aggressive operations done on it and to extract the vital piece of information embedded into it. The proposed work is focused towards studying the behavior of multiple...
Digital colour watermarking has become essential and important copyright protection schemes in multimedia industry. Distribution of digital documents, especially colour images, over the internet has also become increasingly cost-efficient and widespread. The increased importance of digital media brings new challenges for securing the distribution of digital multimedia to make it both profitable for...
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...
This paper presents the novel multi-bit bitwise adaptive embedding algorithms for data hiding. These embedding algorithms can embed multi-bit (k-bit, k ≥ 1 ) secret data into cover data only introduce minimum embedding error smaller than (2k-1-1)2i-k according to the embedding location i. To achieve such a goal, the proposed embedding algorithm adaptively evaluates the most similar value to replace...
Internet evolution, along with the advancement of digital multimedia tools have create a major impact in making the storage and distribution of multimedia content a straightforward tasks. Thus security of multimedia contents becomes a vital issue and there is a need in protecting the digital content against counterfeiting, piracy and malicious manipulations. Digital watermarking is an evolving field...
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