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image compression based on a multipoint Taylor series representation

Image compression based on a multipoint Taylor series repres...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： G. Franssens M. de Maziere D. Fonteyn D. Fussen BIRA-Belgian Institute for Space Aeronomy Brussels Belgium

An image compression/decompression method is proposed, based on a new interpolation formula of Hermite-Birkhoff type. It is based on a function representation that uses a truncated multipoint Taylor (MT) series. Given a regularly tabulated image, first spatial derivatives (up to a chosen order) are computed by a FFT algorithm. Secondly a knot placing strategy selects sample point positions. The image values and spatial derivatives at these sample points are stored as the compressed data. Decompression is achieved by applying the MT interpolant to the compressed data. The quality of compression is user controlled by specifying the maximum order of spatial derivatives and the number of knots to be used. The method is found to be superior to JPEG in both reduction factor and quality, when reasonable smooth data is to be compressed with high accuracy. In this case, data reduction ratios in the range 10-100 can be obtained with a root mean square reconstruction error of the order of 1-2%. For compression of real-life color images it is inferior to JPEG and yields reduction ratios of about 4, at the threshold of notable picture degradation to the eye. A number of compression/decompression examples are shown.

关键词： image coding Taylor series Transform coding Interpolation Color image reconstruction Data compression Humans Root mean square Fractals

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Two frontiers in morphological image analysis: differential evolution models and hybrid morphological/linear neural networks

Two frontiers in morphological image analysis: differential ...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： P. Maragos M. Akmal Butt L.F.C. Pessoa Institute of Language and Speech Processing Marousi Greece School of E.C.E Georgia Institute of Technology Atlanta GA USA

We briefly describe advancements in two broad areas of morphological image analysis. Part I deals with differential morphology and curve evolution. The partial differential equations (PDEs) that model basic morphological operations are first presented. The resulting dilation PDE, numerically implemented by curve evolution algorithms, improves the accuracy of morphological multiscale analysis by Euclidean disks and (its anisotropic/heterogeneous version) is the basic ingredient of PDE models that solve image analysis problems such as gridless halftoning and watershed segmentation based on the eikonal PDE. Part II deals with morphology-related systems for pattern recognition. It presents a general class of multilayer feedforward neural networks where the combination of inputs in every node is formed by hybrid linear and nonlinear (of the morphological/rank type) operations. For its design a methodology is formulated using ideas from the backpropagation algorithm and robust techniques are developed to circumvent the non-differentiability of rank functions. Experimental results in handwritten character recognition are described and illustrate some of the properties of this new type of neural nets.

关键词： image analysis Algorithm design and analysis Multi-layer neural network Neural networks Morphology Partial differential equations Morphological operations Anisotropic magnetoresistance image segmentation Pattern recognition

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Proceedings of the 1997 10th brazilian symposium of computer Graphic and image processing, SIBGRAPI 97

Proceedings of the 1997 10th Brazilian Symposium of Computer...

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Proceedings of the 1997 10th brazilian symposium of computer Graphic and image processing, SIBGRAPI 97

The proceedings contains 29 papers from the X brazilian symposium of computer Graphic and image processing. Topics discussed include: high quality rendering of two-dimensional continuous curves;real time rendering of photo-textured terrain height fields;interactive animation;hierarchical skeleton-based implicit model;representation of conics in the oriented projective plane;wavelet and entropy analysis combination to evaluate diffusion and correlation behaviors;multiscale segmentation and enhancement in mammograms;similarity-based versus template matching-based methodologies for image alignment of polyhedral-like objects under noisy conditions;and morphological operators characterized by neighborhood graphs.

关键词： Three dimensional computer graphics

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Morphological image segmentation applied to video quality assessment

Morphological image segmentation applied to video quality as...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： R. De Alengar Lotufo W.D.F. Da Silva A.X. Falcao A.C.F. Pessoa IC-UNICAMP Universidade Estadual de Campinas (UNICAMP) Sao Paulo Brazil CPqD Centro de Pesquisa e Desenvolvimento/Telebrás Sao Paulo Brazil FEEC-UNICAMP Universidade Estadual de Campinas (UNICAMP) Sao Paulo Brazil

This paper presents a methodology to morphological video segmentation used as part of a method to estimate the subjective video quality assessment. The segmentation goal is to partition the sequence frames in three different regions: homogeneous, border and texture. Previous work has shown the importance of computing video impairment measurements to each of these regions separately, in contrast to use global measurements. The segmentation approach presented in this work uses a collection of morphological tools such as connected smoothing filters, morphological gradients, and watershed. Special attention is devoted to describe the recent concept of connected filters, used as the kernel of the morphological segmentation algorithms. The performance of two morphological segmentation paradigms, one based on the flat zone, and the other based on the watershed-plus-markers approach are evaluated and compared to other segmentation methodology used in video quality assessment.

关键词： image segmentation Quality assessment Video compression Video on demand Video codecs Layout Video coding Code standards Smoothing methods Kernel

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Three-dimensional reconstruction from a set of video cameras of environments for virtual collaboration

Three-dimensional reconstruction from a set of video cameras...

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brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： R. Bajcsy G. Kamberova R. Enciso L. Nocera H. Fuchs G. Welch R. Sara Computer Science Department North Carolina State University Chapel Hill NC USA Computer and Information Science Department-GRASP Laboratory University of Pennsylvania Philadelphia PA USA CVUT Czech Technical University Prague Czech Republic University of Southern California Los Angeles CA USA

In the advent of the ubiquity of distributed computing with multimedia capabilities, it is very natural to contemplate collaborations that were not previously possible. In the past scientists, doctors, educators, engineers always had need to share, exchange, debate their work, designs, methodology, knowledge and experience. This was commonly done by attending meetings, publishing in common journals, sometimes books, and visiting each other's laboratories, research institutions, or attending lectures at universities. Recently, advances in computer vision, computer graphics and networking, make possible a new way of communication by immersing participants at remote sites into a common 3D virtual world. The 3D virtual world is high quality, realistic, dynamically updated representation which joins the models of the real worlds at each of the remote sites. This virtual world provides means for telecollaboration, it makes the real-time 3D interaction of people at remote locations possible. We describe the new "teleimmersion" technology. We concentrate on the current state of our research related to the problem of accurate, precise, real-time recovery of the individual remote 3D models, their merging into a common virtual world, and the real-time rendering of this world.

关键词： Cameras Video sharing Distributed computing Multimedia computing Collaborative work Design engineering Knowledge engineering Design methodology Publishing Books

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An improved output-size sensitive parallel algorithm for hidden-surface removal for terrains

An improved output-size sensitive parallel algorithm for hid...

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International symposium on Parallel processing

作者： N. Gupta S. Sen Department of Computer Science and Engineering Indian Institute of Technology New Delhi India

We describe an efficient parallel algorithm for hidden-surface removal for terrain maps. The algorithm runs in O(log/sup 4/ n) steps on the CREW PRAM model with a work bound of O((n+k)polylog(n)) where n and k are the input and output sizes respectively. In order to achieve the work bound we use a number of techniques, among which our use of persistent data-structures is somewhat novel in the context of parallel algorithms. To the best of our knowledge this is the most efficient parallel algorithm for hidden-surface removal for an important class of 3-D scenes.

关键词： Parallel algorithms Layout Algorithm design and analysis image segmentation computer science Phase change random access memory History computer graphics computer displays Rendering (computer graphics)

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Rendering computer animations on a network of workstations

Rendering computer animations on a network of workstations

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International symposium on Parallel processing

作者： T.A. Davis E.W. Davis Department of Computer Science North Carolina State University USA

Rendering high-quality computer animations requires intensive computation, and therefore a large amount of time. One way to speed up this process is to devise rendering algorithms which reduce computation by taking advantage of image characteristics, such as frame or temporal coherence. Another way is to run the rendering process on specialized or enhanced hardware, such as a multiprocessor machine. This paper details our experiences in combining these techniques through a parallel rendering algorithm exploiting frame coherence run on a network of workstations acting as a single processing system. This system provides a powerful and general method for obtaining high-quality animations with a significant reduction in computation and overall processing time. We present several techniques for partitioning the data across the workstation processors and report our results for each. While all of the partitioning schemes are scalable, some handle load balancing more effectively than others.

关键词： computer networks Animation Workstations Rendering (computer graphics) Ray tracing Layout graphics Motion pictures Clustering algorithms Algorithm design and analysis

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Hardware implementation of a wavelet based image compression coder

Hardware implementation of a wavelet based image compression...

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IEEE symposium on Advances in Digital Filtering and Signal processing

作者： J. Singh A. Antoniou D.J. Shpak Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

A VLSI architecture designed to perform real-time image compression using wavelets is described. The two basic modules of the architecture are a 2-D wavelet transform generator and a coder based on the SPIHT algorithm for lossy image compression. A folded architecture is proposed for computing the 2-D wavelet transform. The architecture uses 3 parallel computational units and 2 storage units. The hardware for the SPIHT coder uses 2 content addressable memories and 3 random access memories. The designs are modular and can easily be extended for different levels of wavelet decomposition and filter lengths. The derived architecture has been functionally verified for an 8/spl times/8 image size by simulating its VHDL code using Mentor graphics.

关键词： Hardware image coding computer architecture Wavelet transforms Very large scale integration Concurrent computing Associative memory Random access memory Filters graphics

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Rapid 3D cone-beam reconstruction with the Algebraic Reconstruction Technique (ART) by utilizing texture mapping graphics hardware

Rapid 3D cone-beam reconstruction with the Algebraic Reconst...

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IEEE symposium on Nuclear Science (NSS/MIC)

作者： K. Mueller R. Yagel Department of Computer Science Ohio State Uinversity Columbus OH USA

The Algebraic Reconstruction Technique (ART) reconstructs a 2D or 3D object from its projections. It has, in certain scenarios, many advantages over the more popular Filtered Backprojection approaches and has also recently been shown to perform well for 3D cone-beam reconstruction. However, so far ART's slow speed has prohibited its routine use in clinical applications. Here, the authors devise a new hardware acceleration scheme, employing readily available texture mapping graphics hardware, that allows quality 3D cone-beam reconstructions to be obtained at almost interactive speeds.

关键词： Subspace constraints image reconstruction Signal processing algorithms Hardware Workstations Digital signal processing chips Algorithm design and analysis computer graphics computer science Tomography

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Implementation of an edge detection algorithm in a reconfigurable computing system

Implementation of an edge detection algorithm in a reconfigu...

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brazilian symposium on Integrated Circuits and Systems Design

作者： R.C.D.M. Tavares C.J.N. Coelho A.D.A. Araujo A.O. Fernandes Dept. of Comput. Sci. Univ. Fed. de Minas Gerais Belo Horizonte Brazil Computer Engineering Laboratory-Computer Science Department Universidade Federal de Minas Gerais Brazil Universidade Federal de Minas Gerais Belo Horizonte MG BR

This paper presents the implementation of a coprocessor that speeds up Roberts gradient edge detection on monochromatic images with 256 gray levels. The coprocessor is implemented in a reconfigurable computing system ... 详细信息

关键词： image edge detection Hardware Costs Coprocessors Software performance Field programmable gate arrays Microprocessors computer architecture Silicon Signal processing algorithms

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