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4th International Conference on parallel and distributed methods for image processing IV

作者： Park, Y Shin, S Chun, J Agcy Def Dev Taejon 305600 South Korea

ISBN: (纸本)0819437638

We shall show how to extract various important information on the motion of a target (enemy aircraft) from a sequence of its image frames obtained using a single imaging sensor which is mounted on an aircraft. Specifically, we present an algorithm which estimates following 12 parameters of an enemy aircraft from its image sequence;position (three), linear velocity (three), attitude (three), instantaneous angular velocity (three) and optional acceleration (three). To extract the attitude, we use a matching algorithm for the captured image frame to the modeled image. The objective function is the value of correlation between these two images, and we use simulated annealing and downhill simplex methods for maximizing the objective function. Finally, estimation of the position and the attitude is accomplished with a 12-state extended Kalman filter. Through simulations, we show that the proposed algorithm is superior to conventional algorithms which do not use the attitude information.

关键词： Target Tracking simulated annealing Euler angles Kalman filter

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Exact radon rebinning algorithm for the long object problem in helical cone-beam CT

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IEEE TRANSACTIONS ON MEDICAL IMAGING 2000年第5期19卷 361-375页

作者： Schaller, S Noo, F Sauer, F Tam, KC Lauritsch, G Flohr, T Siemens Med Tech Forchheim Germany Univ Liege Inst Elect Montefiore B-400 Liege Belgium Siemens Corp Res Inc Princeton NJ 08540 USA

This paper addresses the long object problem in helical cone-beam computed tomography. We present the PHI-method, a new algorithm for the exact reconstruction of a region-of-interest (ROI) of a long object from axially truncated data extending only slightly beyond the ROI, The pi-ii-method is an extension of the Radon-method, published by Kudo, Noo, and Defrise in issue 43 of journal Physics in Medicine and Biology. The key novelty of the PI-ii-method is the introduction of a virtual object f(phi)(x) for each value of the azimuthal angle cp in the image space, with each virtual object having the property of being equal to the true object f(x) in some ROI Omega(m). We show that, for each phi, one can calculate exact Radon data corresponding to the two-dimensional (2-D) parallel-beam projection of f(phi)(x) onto the meridian plane of angle phi, Given an angular range of length pi of such parallel-beam projections, the ROI Omega(m), can be exactly reconstructed because f(x) is identical to f(phi)(x) in Omega(m). Simulation results are given for both the Radon-method and the PHI-method indicating that 1) for the case of short objects, the Radon- and PHI-methods produce comparable image quality 2) for the case of long objects, the PHI-method delivers the same image quality as in the short object case, while the Radon-method fails, and 3) the image quality produced by the PHI-method is similar for a large range of pitch values.

关键词： cone-beam CT image reconstruction long object problem radon method

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Framework to parallelize an image processing library on a distributed-memory system

Framework to parallelize an image processing library on a di...

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parallel and distributed methods for image processing IV

作者： Nicolescu, Cristina Jonker, Pieter P. Delft Univ of Technology Delft Netherlands

The paper presents a framework to add data and task parallelism to a sequential image processing library. The library contains 3 modules, one for low-level operators, the second for intermediate-level operators and the third for high-level operators. We parallelize the low-level operators by data decomposition and we are working at adding task parallelism at the image processing application level. We validate our data parallel approach by testing it with the geometric mean filter and the multibaseline stereo vision algorithm. Experiments on a cluster of workstations show very good speedup.

关键词： image processing

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An efficient parallel algorithm for high resolution color image reconstruction 7

An efficient parallel algorithm for high resolution color im...

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7th International Conference on parallel and distributed Systems Workshops (ICPADS 2000)

作者： Ng, MK Univ Hong Kong Dept Math Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0769505716

This paper studies the application of preconditioned conjugate gradient methods in high resolution color image reconstruction problems. The high resolution color images are reconstructed from multiple undersampled, shifted, degraded color frames with subpixel displacements. The resulting degradation matrices are spatially variant. The preconditioners are derived by taking the cosine transform approximation of the degradation matrices. The resulting preconditioning matrices allow the use of fast transform methods. We show how the methods can be implemented on parallel computers, and toe demonstrate thee's parallel efficiency using experiments on a sixteen processor IBM SP-2.

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FPGA-based parallel implementation for the lifting discrete wavelet transform

FPGA-based parallel implementation for the lifting discrete ...

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4th International Conference on parallel and distributed methods for image processing IV

作者： Aranki, N Jiang, WQ Ortega, A CALTECH Jet Prop Lab Pasadena CA 91101 USA

ISBN: (纸本)0819437638

The rapidly increasing popularity of the discrete wavelet transform (DWT) as an effective tool in many signal processing and data compression applications, and its integration into JPEG 2000 has given rise to various DWT algorithms and their VLSI implementations to reduce complexity and enhance performance, In this paper, we present an efficient hardware implementation of the discrete wavelet transform and its deployment on a reconfigurable FPGA based platform. Our implementation is a novel architecture based on the lifting factorization of the wavelet filter banks. This factorization leads to a block based parallel DWT architecture suitable for hard-ware implementation. To overcome the communication overhead associated with the DWT block transform, we utilize the new Overlap-State(1,2) technique to compute the DWT near block boundaries. A VHDL description of the lifting polyphase factorization architecture was developed and ported to an FPGA hardware platform that was chosen to allow partial and full reconfigurability to accommodate Various applications with different filter banks. Our hardware implementation improves the performance by better than twofold speed up when compared to an efficient pipelined FPGA based implementation.

关键词： discrete wavelet transform field programmable gate array(FPGA) parallel architecture overlap-state split and merge hardware implementation reconfigurable platform

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Intelligent agent support for automated radiology exam

Intelligent agent support for automated radiology exam

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4th International Conference on parallel and distributed methods for image processing IV

作者： Shang, Y Popescu, M Univ Missouri Dept Comp Sci & Comp Engn Columbia MO 65211 USA

ISBN: (纸本)0819437638

A difficult problem in automatic medical image understanding is that for every image type such as x-ray and every body organ such as heart, there exist specific solutions that do not allow for generalization. Just collecting all the specific solutions will not achieve the vision of a computerized physician. To address this problem, we propose an intelligent agent approach that is based on agent-oriented programming and the concept of active fusion. The advantage of agent-oriented programming is that it combines the benefits of object-oriented programming and expert system. For radiology image understanding, we present a multi-agent system that is composed of two major types of intelligent agents: radiologist agents and patient agents. A patient agent asks for multiple opinions from radiologist agents in interpreting a given set of images and then integrates the opinions. A radiologist agent decomposes the image recognition task into smaller problems that are solved collectively by multiple intelligent sub-agents. Finally, we present a preliminary implementation and running examples of the multi-agent system.

关键词： intelligent agent radiology image interpretation information fusion

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On the design and implementation of a parallel, object-oriented, image processing toolkit

On the design and implementation of a parallel, object-orien...

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parallel and distributed methods for image processing IV

作者： Kamath, Chandrika Baldwin, Chuck H. Fodor, Imola K. Tang, Nu A. Lawrence Livermore Natl Lab Livermore United States

Advances in technology have enabled us to collect data from observations, experiments, and simulations at an ever increasing pace. As these data sets approach the terabyte and petabyte range, scientists are increasingly using semi-automated techniques from data mining and pattern recognition to find useful information in the data. In order for data mining to be successful, the raw data must first be processed into a form suitable for the detection of patterns. When the data is in the form of images, this can involve a substantial amount of processing on very large data sets. To help make this task more efficient, we are designing and implementing an object-oriented image processing toolkit that specifically targets massively-parallel, distributed-memory architectures. We first show that it is possible to use object-oriented technology to effectively address the diverse needs of image applications. Next, we describe how we abstract out the similarities in image processing algorithms to enable re-use in our software. We will also discuss the difficulties encountered in parallelizing image algorithms on massively parallel machines as well as the bottlenecks to high performance. We will demonstrate our work using images from an astronomical data set, and illustrate how techniques such as filters and denoising through the thresholding of wavelet coefficients can be applied when a large image is distributed across several processors.

关键词： image processing

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Virtual video tape: A novel development tool for real-time motion image understanding

Virtual video tape: A novel development tool for real-time m...

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4th International Conference on parallel and distributed methods for image processing IV

作者： Mizoguchi, H Hidai, K Hiraoka, K Shigehara, T Mishima, T Saitama Univ DICS Urawa Saitama 3388570 Japan

ISBN: (纸本)0819437638

This paper proposes Virtual Video Tape (WT). It is a randomly accessible motion image recorder in main memory. VVT is realized with only software, not hardware. It is intended as a tool for real-time motion image understanding research. Recent remarkable progress of PC hardware enables to use gigabyte order main memory. By utilizing such large sized memory, there is a possibility to realize motion image recorder with software. Thus we propose VVT as an example of this kind image recorder. Utilizing current components, recording time fan be expected as minutes order. Since the proposed VVT is fully digital, there is no analog medium nor possibility for degradation of image quality. Since there is no deterioration of playback image and no rewinding. VVT must contribute to program development for motion image understanding. Based upon the proposed idea, the authors have implemented a prototype VVT and used the prototype to develop visual tracking, real-time face detection, and so forth. Through the implementation and experience of the usage, we have confirmed feasibility and effectiveness of the proposed idea. In this paper, the authors discuss background, required functions and structure of the recorder. Some implementation issues are also described.

关键词： solid state video recorder deterioration-free rewinding-free randomly accessible

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parallel approach to incorporating face image information into dialogue processing

Parallel approach to incorporating face image information in...

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parallel and distributed methods for image processing IV

作者： Ren, Fuji Hiroshima City Univ Hiroshima Japan

There are many kinds of so-called irregular expressions in natural dialogues. Even if the content of a conversation is the same in words, different meanings can be interpreted by a person's feeling or face expression. To have a good understanding of dialogues, it is required in a flexible dialogue processing system to infer the speaker's view properly. However, it is difficult to obtain the meaning of the speaker's sentences in various scenes using traditional methods. In this paper, a new approach for dialogue processing that incorporates information from the speaker's face is presented. We first divide conversation statements into several simple tasks. Second, we process each simple task using an independent processor. Third, we employ some speaker's face information to estimate the view of the speakers to solve ambiguities in dialogues. The approach presented in this paper can work efficiently, because independent processors run in parallel, writing partial results to a shared memory, incorporating partial results at appropriate points, and complementing each other. A parallel algorithm and a method for employing the face information in a dialogue machine translation will be discussed, and some results will be included in this paper.

关键词： image processing

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parallel DSP implementation of wavelet transform in image compression

Parallel DSP implementation of wavelet transform in image co...

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IEEE International Symposium on Circuits and Systems (ISCAS 2000)

作者： Haapala, K Kolinummi, P Hämäläinen, T Saarinen, J Tampere Univ Technol Digital & Comp Syst Lab FIN-33101 Tampere Finland

A parallel implementation of the 2D discrete wavelet transform on a distributed memory multiprocessor system called PARNEU is presented. The mapping has been chosen with consideration to load balancing and communication methods in order to achieve the best possible scalability and performance in transforming one single image. Detailed performance figures are included. Experimental results show that significant parallel speedup is reached with this mapping.

关键词： Digital signal processing

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