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2005 16th British Machine Vision Conference, BMVC 2005

作者： Langs, Georg Peloschek, Philipp Donner, René Bischof, Horst Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Diagnostic Radiology Medical University of Vienna Austria Pattern Recognition and Image Processing Group Vienna University of Technology Austria

ISBN: (纸本)1901725294

Autonomous model building is a crucial trend in model based methods like AAMs. This paper introduces an approach that deals with non-linearities by detecting distinct sub-parts in the data. Sub-models each representing an individual sub-part are derived from a minimum description length criterion. Thereby the resulting clique of models is more compact and obtains a better generalization behavior than a single model. The proposed AAM clique generation deals with non-linearities in the data in a generic information theoretic manner reducing the necessity of user interaction during training.

关键词： Information theory

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Caustics of developable surfaces

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Frontiers of Information Technology & Electronic Engineering 2022年第3期23卷 479-487页

作者： Miklos HOFFMANN Imre JUHASZ Ede TROLL Institute of Mathematics and Computer Science Eszterhazy Karoly UniversityEger 3300Hungary Department of Computer Graphics and Image Processing University of DebrecenDebrecen 4010Hungary Department of Descriptive Geometry University of MiskolcMiskolc 3515Hungary

While considering a mirror and light rays coming either from a point source or from infinity,the reflected light rays may have an envelope,called a caustic *** this paper,we study developable surfaces as *** caustic surfaces,described in a closed form,are also developable surfaces of the same type as the original mirror *** provide efficient,algorithmic computation to find the caustic surface of each of the three types of developable surfaces(cone,cylinder,and tangent surface of a spatial curve).We also provide a potential application of the results in contemporary free-form architecture design.

关键词： Caustics Developable surface Reflected light rays Curve of regression

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Recognizing human activities based on head movement trajectories

Recognizing human activities based on head movement trajecto...

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International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Kornél Bertók Attila Fazekas Department of Computer Graphics and Image Processing University of Debrecen Debrecen city Hungary

Human activity recognition from movement-related signals or image sequences is a quite challenging problem in computer vision. Human activities can be decoded from various set of communication channels but it is proved that the head has a highlighted role to emphasize the message that is being communicated. Recognizing activities from head movements can be suitable, because the head has a near constant shape and appearance during the communication. The spatiotemporal segmentation of head movements can be also done by analyzing the trajectories. In this study, we give a general model for description and recognition of head movements. The basic idea has been extended by introducing a human activity database to make better decisions during the recognition. The proposed approach takes into consideration facial regions that encode essential information about head movements. The essence of head movements is extracted from motion history image representation and aligned by dynamic time warping. The efficiency of our system is also demonstrated by the recognition of head-drawn letters.

关键词： Face Trajectory Databases Time series analysis Spatiotemporal phenomena Time measurement

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TSM resilient audio watermarking using IMFs

TSM resilient audio watermarking using IMFs

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Canadian Conference on Electrical and computer Engineering (CCECE)

作者： Saif AlZahir Md Wahedul Islam Image Processing and Graphics Laboratory Computer Science Department UNBC BC Canada

With widespread of the Internet as well as the numerous applications that involve audio signals and systems, the issue of ownership proof become imperative. In this paper, we present an audio watermark scheme that is based on Empirical Mode Decomposition and Hilbert Huang Transform. The audio signal is decomposed into several mono-component signals or Intrinsic Mode Functions to serve as the addressee for watermark. The watermark is a pseudo random number which is added to the highest and lowest Intrinsic Mode Functions of the signal to generate what we call the modified IMFs which is in turn added to the remaining IMFs to produce the watermarked signal. Our experimental results show that the proposed method is robust against signal processing attacks such as MP3, time scale modification, resizing, and others. The obtained results meet the recommended imperceptibility signal to noise ratio.

关键词： Watermarking Robustness Signal to noise ratio Transforms Digital audio players Detectors

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Fast two-step segmentation of natural color scenes using hierarchical region-growing and a color-gradient network

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Journal of the Brazilian computer Society 2008年第4期14卷 29-40页

作者： von Wangenheim, Aldo Bertoldi, Rafael F. Abdala, Daniel D. Richter, Michael M. Priese, Lutz Schmitt, Frank Lab for Image Processing and Computer Graphics - LAPIX Department of Computer Sciences - INE Universidade Federal de Santa Catarina - UFSC CEP 88049-200 Florianopolis - SC Brazil University of Münster Department of Computer Science Einsteinstrasse 62 D-48149 Münster Germany Department of Computer Science University of Calgary AB Canada Institut für Computervisualistik Universität Koblenz-Landau Postfach 201 602 56016 Koblenz Germany

We present evaluation results with focus on combined image and efficiency performance of the Gradient Network Method to segment color images, especially images showing outdoor scenes. A brief review of the techniques, Gradient Network Method and Color Structure Code, is also presented. Different region-growing segmentation results are compared against ground truth images using segmentation evaluation indices Rand and Bipartite Graph Matching. These results are also confronted with other well established segmentation methods (EDISON and JSEG). Our preliminary results show reasonable performance in comparison to several state-of-art segmentation techniques, while also showing very promising results comparatively in the terms of efficiency, indicating the applicability of our solution to real time problems.

关键词： Efficiency

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Extraction of human body skeleton based on silhouette images

Extraction of human body skeleton based on silhouette images

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2nd International Workshop on Education Technology and computer Science, ETCS 2010

作者： Ding, Jianhao Wang, Yigang Yu, Lingyun State Key Laboratory of CAD and CG Zhejiang University Hangzhou China Institute of Computer Graphics and Image Processing Hangzhou Dianzi University Hangzhou China Department of Mathematics and Computing Science University of Groningen Netherlands

ISBN: (纸本)9780769539874

Skeleton extraction is essential for general shape representation. A typical skeletonization algorithm should obtain the ability to preserve original object's topological and hierarchical properties. However, most of current methods are high memory cost, computationally intensive, and also require complex data structures. In this paper, we propose an efficient and accurate skeletonization method for the skeleton feature points extracted from human body based on silhouette images. First, the gradient of distance transform is used to detect critical points inside the foreground. Then, we converge and simplify critical points in order to generate the most important and elegant skeleton feature points. Finally, we present an algorithm which connects the skeleton feature points and estimates the position of skeleton joints. © 2010 IEEE.

关键词： Extraction

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Face tracking for expressions simulations 03

Face tracking for expressions simulations

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Proceedings of the 4th international conference conference on computer systems and technologies: e-Learning

作者： Peter Gejgus Martin Sperka Department of Computer Graphics and Image Processing Comenius University of Technology Department of Computer Science and Engineering Slovak University of Technology

ISBN: (纸本)9789549641332

This paper presents a work that is part of the system for creation of real-faced avatar for emphatic communication. We have made a new extension of the KL T (Kanade-Lucas-Tomasi) face tracker. which is robust against loss of the tracked points. Stochastic skin-color model is used for a face segmentation in the frames contained in a video sequence. Ellipse-fitting is used for selection of the face candidates because of the elliptical face shape. The proposed method achieved real-time performance The results seem very promising.

关键词： KLT tracker

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A near minimum sparse pattern coding based scheme for binary image compression

A near minimum sparse pattern coding based scheme for binary...

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IEEE International Conference on image processing

作者： S. Zahir M. Naqvi Image Processing Graphics and Multimedia Lab Department of Computer Science UNBC Prince George Canada

In this paper, we propose a near minimum sparse pattern coding based scheme for binary image compression. Sparse patterns such as those obtained from prediction, image differencing, and other methods can be coded efficiently using the scheme proposed in this paper. In this research we apply our scheme on coordinate representation of rectangular regions via a number of matrices. Such representations allow for efficiently coding these vertices, and hence compress the image significantly. Simulation results show that the proposed scheme outperformed previously published methods for coordinate data coding by nearly 17%. This scheme has low complexity compared with JBIG2.

关键词： image coding Block codes image processing computer graphics computer science Sparse matrices Decorrelation Probability Partitioning algorithms Standards publication

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Extended Cubic Uniform B-spline and α-B-spline

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Acta Automatica Sinica 2008年第8期34卷 980-984页

作者： Gang XU Guo-Zhao WANG Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 P. R. China

Spline curve and surface play an important role in CAD and computer graphics. In this paper, we propose several extensions of cubic uniform B-spline. Then, we present the extensions of interpolating α-B-spline based on the new B-splines and the singular blending technique. The advantage of the extensions is that they have global and local shape parameters. Furthermore, we also investigate their applications in data interpolation and polygonal shape deformation.

关键词： B-spline α-B-spline singular blending interpolation curve/surface modeling

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A New Efficient Algorithm for Lossless Binary image Compression

A New Efficient Algorithm for Lossless Binary Image Compress...

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Canadian Conference on Electrical and computer Engineering (CCECE)

作者： Lele Zhou Saif Zahir Image Processing Graphics and Multimedia Lab Computer Science Department University of Northern British Columbia Canada

Binary image compression is desirable for a wide range of applications, such as digital libraries, map archives, fingerprint databases, facsimile, etc. In this paper, we present a new highly efficient algorithm for lossless binary image compression. The proposed algorithm introduces a new method, direct redundancy elimination, to efficiently exploit the two-dimensional redundancy of an image, as well as a novel dynamic context model to improve the efficiency of arithmetic coding. Simulation results show that the proposed algorithm has comparable compression ratio to JBIG standard. In many cases, the proposed algorithm outperforms the JBIG standard

关键词： image coding Arithmetic Context modeling image processing computer graphics computer science Electronic mail Multimedia databases Application software Software libraries

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