Papers by Keyword: Watermarking

Abstract: A fingerprint-based digital watermark algorithm for image processing is proposed. Firstly, the watermark is done the scrambling by the Arnold transform. Secondly, the digital watermarking is done the chaos encryption by the Tent chaos sequence. Thirdly, the original image is transformed by the discrete Curvelet transformation. Finally, the watermarking image is embedded into detail scale coefficient matrix of Curvelet transform. The experimental result demonstrated that watermarking extraction’s effect is acceptable. Moreover, severe image attacks such as noise, image crop and JPEG compression and so on are survived by the embedded watermarking.

Abstract: The crucial of design a robust image watermarking scheme is cope with geometrical attacks in transform domain.In this paper, a novel feature-based image watermarking scheme resilient to the geometrical attacks is proposed. Firstly, the harris-affine detector is utilized to extract invariant feature points from the host image. Then, by the feature scale of the local structure, the feature regions are adaptively computed and normalized. Finally, several copies of the digital watermark are embedded into the nonoverlapped local feature regions by quantizing the magnitude vectors of the DFT middle frequency. During detection, the resynchronization is achieved through feature points. And the embedded sequence can be extracted by “majority principles” without resorting to the original host image. Experimental results show that the proposed algorithm has good transparency and is very robust to common image processing and geometric attacks.

Abstract: In this paper we proposed a secure image watermarking algorithm for digital image using the visual cryptography (VC) and discrete fractional Fourier transform (DFRFT). We use the visual secret sharing scheme to construct two shares, namely, master share and ownership share. Features of the original image are extracted using Non-Negative Matrix Factorization (NMF), and are used to generate the master share. Ownership share is generated with the help of secret image (watermark) and the master share, using VC technique. In case of any dispute, the master shares and ownership shares can be stacked together to give the copyright image verifying the ownership about the host image. In order to achieve the robustness and security, the properties of VC, DFRFT and NMF are used in our scheme. The experimental results show that the proposed scheme is strong enough to resist various signal processing operations.

Abstract: This paper proposed a new database watermarking algorithm based on a numerical attribute of database. Firstly, the copyright image was encrypted by a chaotic system to produce a binary sequence as the watermark signal. Then it used two hash functions to realize the watermark embedding. The first hash value was calculated by using the connection value of the key and the primary key. Then it filtered out the tuples whose corresponding hash value was even. The second double-hash value was calculated by using the connection of the key and the first hash value, which was used to label tuples and partition tuples. The first hash value was used as a control signal to adjust the parity of the candidate attribute bit when the watermark was embedded. Theoretical analysis and experimental results indicate that the algorithm reduces the amount of embedding watermark and improves the robustness and security of the watermark.

Abstract: Digital video watermarking is an efficient way of copyright protection. A robust watermarking was proposed that ccording to the video features using the evolutional method of video image classification processing, suitable for video performance and human visual characteristics of video watermarking, and put forward a kind of using Bees evolutional algorithm for video image classification processing of video watermarking algorithm. All the key frame numbers are converts to a binary matrix after data transformation. At last the binary image is produced. From this, the watermarking image reflects the video’s features, so it is effective to resist the watermark copy attack.

Abstract: Image watermarking is a carrier image watermarking technology. This paper studies the research direction of the digital watermarking image of the DCT-based image robust watermarking algorithm design. We studies robust algorithm of watermarking image on specific design and implementation process based on DCT domain, the process including image watermarking embedding and watermarking extraction and watermarking detection. Experimental results achieved watermarking embedding evaluation requirements: effectiveness, transparency and robustness.

Abstract: In order to take into account the tradeoff relation between the watermark quality and the watermark robustness in digital image copyright protection, a novel generation method of image watermarking is proposed with block compressed sensing in DWT domain. The watermark data are formed by utilizing measurement values of blocking compressed sensing to fingerprint image, and are embedded into all sub-blocks of the LLn sub-band of the transformed host image. Experimental results show that the introduction of compressed sensing theory improves the robustness for resisting attacks and recovery quality of the fingerprint image watermarking.

Abstract: Digital watermarkingtechnology as an emerging interdisciplinary application of technology is animportant branch of information hiding science . It combines differenttheoretical and technical disciplines , such as information theory,communication theory , signal processing, random probability theory , codingtheory , optimization theory , fuzzy theory, detection theory , matrixanalysis, pattern recognition , cryptography , computer science and networktechnology, algorithm design , etc., but also including legal and other issues. Digital watermarking of multimedia information security field as the currenthot technology , has received international academic community and the businesscommunity 's attention [ 1 ] [ 2 ]

Abstract: In this paper, we propose a novel medical color image digital watermarking algorithm, which can realize watermark capacity, transparency and robustness effective compromise. We encrypt the watermark image by Arnold Transform at first and then take it into a random sequence. The principal component of medical image is divided into some sub-blocks with 4×4 and each block is transformed by DCT. One bit of watermark is embedded by comparing the size of specific DCT coefficients in the adjacent sub-blocks. Watermark can be extracted without the original medical image. The experimental results show that the digital watermarking algorithm has a high transparency and big capacity as well as certain robustness.

Abstract: In this paper, we present a blind digital watermarking method for color image based on nearest neighbor interpolation. The algorithm has the following characteristics: (1) it generate adaptive watermark based on the size of carrier image,so as to improve the robustness of binary watermark; (2) the watermark is embedded in the DCT coefficient of intermediate frequency, which can effectively resist common attacks, such as Gaussian noise-adding, salt and pepper noise-adding, cropping, Wiener filtering, JPEG compression;(3) the watermarking detection is simple and fast, and does not require carrier image. The experiments show that the algorithm has good invisibility and strong robustness.