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The watermark copy attack based on the principle analysis

Journal of computers 2011年第1期22卷 1-8页

作者： Li, Li Ma, Ying-Ying Lu, Jian-Feng Fu, Yan-Hui Department of Computer Graphics and Image Processing Hangzhou Dianzi University Hangzhou 310018 Zhejiang China

With the development of the advanced printer and scanner, it is easy to transform images between the digital format and the printed. So, the digital watermarking algorithm resilient to the print and scan operation is necessary. In this paper, we analyze a watermark software product which could resist print-scan attack. Using original images and watermarked images , the principle of the watermark software can be estimated, that is : first add yellow borders to the original images , then separately process R,G,B components of color images: segment the images into blocks with 16*16 size, and take discrete cosine transform (DCT) to every sub-block. Finally, embed watermarking to images through modifying the intermediate frequency coefficients of sub-block. After learning the algorithm theory, it is easy to copy a watermarking to another image. Experimental results show that the algorithm is effective.

关键词： Discrete cosine transforms

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Visibly accurate model-based binary image compression scheme

Visibly accurate model-based binary image compression scheme

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IEEE International Conference on Signal and image processing Applications (ICSIPA)

作者： Saif alZahir Image Processing Graphics and Multimedia Lab Computer Science Department UNBC Prince George BC Canada

In this paper we propose a model-based binary image compression scheme. In this scheme, we merge one-dimensional (1-D) blocks of black pixels of the input binary image with those in consecutive rows into larger blocks using mathematical models that preserve the quality of the image. This process reduces the number of vertices when the image is segmented into rectangles for compression. The top-left and the bottom-right vertices of each generated rectangle are then identified and the coordinates of which are efficiently encoded. The model for merging the blocks was obtained through extracting the data values involving the blocks of various widths and the subjective tolerance of an average viewer. The data values are then plotted on a Cartesian plane and approximated with linear, logarithmic, and polynomial functions. Simulation results show that the images after merging using the proposed model have less number of rectangles without any obvious image distortion and have higher compression ratio those rectangular partitioning methods in the literature.

关键词： image coding Mathematical model Merging Polynomials image segmentation Simulation Correlation

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Operators to dilate and erode color impulse noise images based on the morphology

Operators to dilate and erode color impulse noise images bas...

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2nd International Conference on E-Business and E-Government, ICEE 2011

作者： AhYin, Xing-Yun Research Direction: Digital Image Processing Computer Graphics Computer and Information Engineering Department Huainan Normal University Huainan 232038 China

ISBN: (纸本)9781424486946

By analyzing the numerical characteristics of impulse noise images, in order to resolve spreading-noise problem resulted from dilating and eroding images base on mathematical morphology, an algorithm of dilating and eroding color impulse noise images based on mathematical morphology is proposed. The result of the experiment demonstrates that the new algorithm has same effect as traditional algorithm of dilating and eroding images, but also suppresses impulse noise. © 2011 IEEE.

关键词： Impulse noise

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A non-linear diffeomorphic framework for prostate multimodal registration

A non-linear diffeomorphic framework for prostate multimodal...

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2011 International Conference on Digital image Computing: Techniques and Applications, DICTA 2011

作者： Mitra, Jhimli Kato, Zoltan Martí, Robert Oliver, Arnau Lladó, Xavier Ghose, Soumya Vilanova, Joan C. Meriaudeau, Fabrice Le2i-UMR CNRS 5158 Université de Bourgogne Le Creusot France Computer Vision and Robotics Group Universitat de Girona Girona Spain Department of Image Processing and Computer Graphics University of Szeged Szeged Hungary Girona Magnetic Resonance Center Girona Spain

ISBN: (纸本)9780769545882

This paper presents a novel method for non-rigid registration of prostate multimodal images based on a nonlinear framework. The parametric estimation of the non-linear diffeomorphism between the 2D fixed and moving images has its basis in solving a set of non-linear equations of thin-plate splines. The regularized bending energy of the thin-plate splines along with the localization error of established correspondences is jointly minimized with the fixed and transformed image difference, where, the transformed image is represented by the set of non-linear equations defined over the moving image. The traditional thin-plate splines with established correspondences may provide good registration of the anatomical targets inside the prostate but may fail to provide improved contour registration. On the contrary, the proposed framework maintains the accuracy of registration in terms of overlap due to the non-linear thinplate spline functions while also producing smooth deformations of the anatomical structures inside the prostate as a result of established corrspondences. The registration accuracies of the proposed method are evaluated in 20 pairs of prostate midgland ultrasound and magnetic resonance images in terms of Dice similarity coefficient with an average of 0.982 ± 0.004, average 95% Hausdorff distance of 1.54 ± 0.46 mm and mean target registration and target localization errors of 1.90±1.27 mm and 0.15 ± 0.12 mm respectively. © 2011 IEEE.

关键词： Ultrasonics

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Operators to dilate and erode color impulse noise images based on the morphology

Operators to dilate and erode color impulse noise images bas...

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International Conference on E-Business and E-Government (ICEE)

作者： Ah Yin Xing-yun Research direction: Digital Image Processing Computer Graphics Computer and Information Engineering Department Huainan Normal University Huainan 232038 P. R. China

关键词： Niobium image color analysis Morphology computers Colored noise Machine vision

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Sampling step importance in hierarchical semantic segmentation of microscopic images

Sampling step importance in hierarchical semantic segmentati...

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International Conference on System Theory, Control, and Computing (ICSTCC)

作者： Cristian Smochina Vasile Manta Walter Kropatsch Department of Computer Science and Engineering Gheorghe Asachi Technical University of Iasi Romania Pattern Recognition and Image Processing Group Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

The objective of semantic segmentation in microscopic images is to extract the cellular, nuclear or tissue components. This problem is challenging due to the large variations of these components features (size, shape, orientation or texture). In this paper we improve the technique presented in [17] used to identify the epithelial nuclei (crypt) against interstitial nuclei in microscopic images taken from colon tissues. In the proposed enhanced approach, the crypt inner boundary is detected using the closing morphological pyramid instead of morphological hierarchy. The outer crypt border is determined by the epithelial nuclei, overlapped by the maximal isoline of the inner boundary. The use of sampling in building the pyramid offers computational efficiency, reduces the amount of used memory, increase the robustness and preserve the quality results. An analysis of the two approaches is performed considering the number of pixels processed to create each level. Also the relation between the levels of the hierarchical structures is established.

关键词： Cryptography image segmentation image reconstruction image resolution Microscopy Buildings Shape

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ICIC Express Letters 2011年第3期5卷 727-731页

作者： Li, Li Zhang, David Ruan, Liuzhao Institute of Computer Graphics and Image Processing Hangzhou Dianzi University Second Avenue Xiashagaojiao District Hangzhou 310018 China Centre for Multimedia Signal Processing and Department of Computing Biometrics Research Centre Hong Kong Polytechnic University Hung Horn Kowloon Hong Kong

The popular formulas of evaluating the similarity of digital watermarks have serious drawbacks: when the similarity degree is 1, the watermarks are not unique. This paper firstly analyzes the drawbacks in the popular formulas, then proposes a new similarity degree formula, which weakens the shortcomings of the existing formulas and overcomes the lack of uniqueness in theory. From the experimental results, the new formula not only does well in evaluating the watermark's similarity degree, but also is in good accordance with visual perception. © 2011 ISSN 1881-803X.

关键词： Digital watermarking

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A Non-Linear Diffeomorphic Framework for Prostate Multimodal Registration

A Non-Linear Diffeomorphic Framework for Prostate Multimodal...

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Proceedings of the Digital image Computing: Technqiues and Applications (DICTA)

作者： Jhimli Mitra Zoltan Kato Robert Marti Arnau Oliver Xavier Llado Soumya Ghose Joan C. Vilanova Fabrice Meriaudeau Computer Vision and Robotics Group Universitat de Girona Girona Spain Le2i-UMR CNRS 5158 Université de Bourgogne Le Creusot France Department of Image Processing and Computer Graphics University of Szeged Szeged Hungary Girona Magnetic Resonance Center Girona Spain

This paper presents a novel method for non-rigid registration of prostate multimodal images based on a nonlinear framework. The parametric estimation of the non-linear diffeomorphism between the 2D fixed and moving images has its basis in solving a set of non-linear equations of thin-plate splines. The regularized bending energy of the thin-plate splines along with the localization error of established correspondences is jointly minimized with the fixed and transformed image difference, where, the transformed image is represented by the set of non-linear equations defined over the moving image. The traditional thin-plate splines with established correspondences may provide good registration of the anatomical targets inside the prostate but may fail to provide improved contour registration. On the contrary, the proposed framework maintains the accuracy of registration in terms of overlap due to the non-linear thin-plate spline functions while also producing smooth deformations of the anatomical structures inside the prostate as a result of established corrspondences. The registration accuracies of the proposed method are evaluated in 20 pairs of prostate mid-gland ultrasound and magnetic resonance images in terms of Dice similarity coefficient with an average of 0.982 ± 0.004, average 95% Hausdorff distance of 1.54 ± 0.46 mm and mean target registration and target localization errors of 1.90±1.27 mm and 0.15 ± 0.12 mm respectively.

关键词： Biopsy Magnetic resonance imaging Equations Spline Glands High definition video Accuracy

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image enhancement by median filters in algebraic reconstruction methods: An experimental study

Image enhancement by median filters in algebraic reconstruct...

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6th International, Symposium on Visual Computing, ISVC 2010

作者： Hantos, Norbert Balázs, Péter Department of Image Processing and Computer Graphics University of Szeged Árpád tér 2 H-6720 Szeged Hungary

ISBN: (纸本)3642172768

Algebraic methods for image reconstruction provide good solutions even if only few projections are available. However, they can create noisy images if the number of iterations or the computational time is limited. In this paper, we show how to decrease the effect of noise by using median filters during the iterations. We present an extensive study by applying filters of different sizes and in various times of the reconstruction process. Also, our test images are of different structural complexity. Our study concentrates on the ART and its discrete variant DART reconstruction methods. © 2010 Springer-Verlag.

关键词： Median filters

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Live cell segmentation in fluorescence microscopy via graph cut

Live cell segmentation in fluorescence microscopy via graph ...

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International Conference on Pattern Recognition

作者： Leskó, Milán Kato, Zoltan Nagy, Antal Gombos, Imre Török, Zsolt Vígh Jr., László Vígh, László Department of Image Processing and Computer Graphics University of Szeged PO. Box 652 H-6701 Szeged Hungary Institute of Biochemistry Biological Research Center Hungarian Academy of Sciences Hungary

ISBN: (纸本)9780769541099

We propose a novel Markovian segmentation model which takes into account edge information. By construction, the model uses only pairwise interactions and its energy is submodular. Thus the exact energy minima is obtained via a max-flow/min-cut algorithm. The method has been quantitatively evaluated on synthetic images as well as on fluorescence microscopic images of live cells. © 2010 IEEE.

关键词： Fluorescence microscopy

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