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检索条件"任意字段=Image Processing: Algorithms and Systems VII"

共 85 条记录，以下是61-70 订阅

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Novel development tool for software pipeline optimization for VLIW-DSPs used in real-time image processing

Novel development tool for software pipeline optimization fo...

引用

Conference on Real-Time Imaging vii

作者： Fürtler, J Mayer, KJ Krattenthaler, W Bajla, I ARC Seibersdorf Res GmbH High Performance Image Proc Dept A-2444 Seibersdorf Austria

ISBN: (纸本)0819448125

Although the hardware platform is often seen as the most important element of real-time imaging systems, software optimization can also provide remarkable reduction of overall computational costs. The recommended code development flow for digital signal processors based on the TMS320C6000(TM) architecture usually involves three phases: development of C code, refinement of C code;and programming linear assembly code. Each step requires a different level of knowledge of processor internals: The developer is not directly involved in the automatic scheduling process. In some cases, however, this may result in unacceptable code performance. A better solution can be achieved by scheduling the assembly code by hand. Unfortunately, scheduling of software pipelines by hand not only requires expert skills but is also time consuming, and moreover, prone to errors. To overcome these drawbacks we have designed an innovative development tool - the Software Pipeline Optimization Tool (SPOT(TM)). The SPOT is based on visualization of the scheduled assembly code by a two-dimensional interactive schedule editor, which is equipped with feedback mechanisms deduced from analysis of data dependencies and resource allocation conflicts. The paper addresses optimization techniques available by the application of the SPOT. Furthermore, the benefit of the SPOT is documented by more than 20 optimized image processing algorithms.

关键词： software pipelining VLIW real-time image processing DSP

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Parametric assessment of the impact of target scene projection on image processing results

Parametric assessment of the impact of target scene projecti...

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Conference on Technologies for Synthetic Environments - Hardware-in-the-Loop Testing vii

作者： Sieglinger, B Flynn, DS Thompson, RA MacAulay Brown Inc Shalimar FL 32579 USA

ISBN: (纸本)0819444677

This paper describes a simulation and analysis of a sensor viewing a "pixelized" scene projector like the KHILS' Wideband Infrared Scene Projector (WISP). The main objective of this effort is to understand and quantify the effects of different scene projector configurations on the performance of several sensor signal processing algorithms. We present simulation results that quantify the performance of two signal processing algorithms used to estimate the sub-pixel position and irradiance of a point source. The algorithms are characterized for different signal-to-noise ratios, different projector configurations, and two different methods for preparing images that drive the projector. We describe the simulation in detail, numerous results obtained by processing simulated images, algorithms and projector properties, and present conclusions.

关键词： Sensors Projection systems Point spread functions Signal to noise ratio Detection and tracking algorithms Computer simulations image processing image sensors Error analysis Sensor performance

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Hierarchical spatial spectral processing for road mapping

Hierarchical spatial spectral processing for road mapping

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Conference on algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral imagery viiI

作者： Patterson, TJ Booz Allen & Hamilton Inc Colorado Springs CO 80910 USA

ISBN: (纸本)0819444758

This paper describes a work in progress to develop an updated road mapping system. The system is designed to generate map products working directly from multispectral imagery. The updated system is uses a resolution hierarchy to match the size of the roads, measured in image pixels, to the optimal processing configurations. The original system was designed to work with low resolution Landsat TM imagery while the updated system is designed to be more versatile with the ability to generate products from the new systems now available such as Landsat vii, IKONOS. and Digital Globe. The majority of the map production is performed in an automated mode requiring no user interaction. A Java interface to support final editing of the automated results has been built to support application on multiple platforms. This paper describes the mapping algorithms, the special editing interface designed for road vector maps, and results of some processing experiments.

关键词： multispectral mapping lines of communication automated feature extraction

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Analytic registration of spatially and spectrally disparate co-located imaging sensors achieved by matching optical flow.

Analytic registration of spatially and spectrally disparate ...

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Conference on algorithms for Multispectral, Hyperspectral, and Ultraspectral imagery vii

作者： Schuler, JM Howard, JG Scribner, DA Warren, PR Klein, RB Satyshur, MP Kruer, MR USN Res Lab Washington DC 20375 USA

ISBN: (纸本)0819440760

A multi-spectral imaging system can be defined as a combination of electro-optic imagers that are mechanically constrained to view the same scene. Subsequent processing of the output imagery invariably requires a spatial registration of one spectral band image to geometrically conform to the imagery from a different sensor. This paper outlines a procedure, to leverage motion estimation of a pair of video sequences to determine a transformation that minimizes the disparity in optical flow between the sequences.

关键词： image registration Video Optical flow image fusion Motion estimation Imaging systems Infrared imaging Infrared radiation Motion models Sensors

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Transformations Volosyuk-Fourier for optimal reconstruction of radio brightness images of wideband and superwideband microwave radiometric systems

Transformations Volosyuk-Fourier for optimal reconstruction ...

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algorithms for Synthetic Aperture Radar imagery vii

作者： Volosyuk, Valerii K. Velasco Herrera, Victor M. Ponomaryov, Vladimir I. Kharkov Aviation Inst Kharkov Ukraine

In the frame of Bayes statistic criterion of optimization the processing algorithms and the structures of radiometric systems for wide-and superwide band electro-magnetic fields spatial-temporal processing are developed. The methods of imaging in multi-beam systems and in systems, that form coherence functions of decorrelated processes. The algorithms has been developed using proposed by authors VF - transforms and proved by them theorem, that are generalization of Fourier transforms and Van Zittert-Zernike theorem, respectively, for the case of wide- and superwide band wave fields spectral analysis.

关键词： image reconstruction

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Multiresolution target discrimination during image formation

Multiresolution target discrimination during image formation

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algorithms for Synthetic Aperture Radar imagery vii

作者： Kaplan, Lance M. Oh, Seung-Mok McClellan, James H. Clark Atlanta Univ Atlanta United States

This paper presents a novel scheme to detect and discriminate landmines from other clutter objects during the image formation process for ultra-wideband (UWB) synthetic aperture radar (SAR) systems. By identifying likely regions containing the targets of interest, i.e., landmines, it is possible to speed up the overall formation time by pruning the processing to resolve regions that do not contain targets. The image formation algorithm is a multiscale approximation to standard backprojection known as the quadtree that uses a 'divide-and-conquer' strategy. The intermediate quadtree data admits multiresolution representations of the scene, and we develop a contrast statistic to discriminate structured/diffuse regions and an aperture diversity statistic to discriminate between regions containing mines and desert scrub. The potential advantages of this technique are illustrated using data collected at Yuma, AZ by the ARL BoomSAR system.

关键词： Radar imaging

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Biomedical signal processing using a new class of wavelets

Biomedical signal processing using a new class of wavelets

引用

Wavelet Applications vii

作者： Shi, Zhuoer Zhang, Desheng Wang, Haixiang Kouri, Donald J. Hoffman, David K. Univ of Houston Houston United States

We design a new compactly-supported interpolating wavelet - distributed approximating functional (DAF) wavelet for biomedical signal/image processing. DAF class is a smooth, continuous interpolating function system which is symmetric and fast-decaying. DAF neural networks are designed for time varying electrocardiogram (EKG) signal filtering. The neural nets use the Hermite-DAF as the basis function and implement a 3-layer structure. DAF wavelets and the corresponding subband filters are constructed for image processing. Edge-enhancement normalization and device-adapted visual group normalization algorithms are presented which sharpen the desired image features (especially for digital mammography) without prior knowledge of the spatial characteristics of the images. We design a nonlinear multiscale gradient-stretch method for feature extraction of mammograms (such as the detection of ill-defined borders and spiculated lesions, etc). A fractal technique is introduced to characterize microcalcifications in localized regions of breast tissue. We employ a DAF wavelet-based multiscale edge detection and Dijkstra fractal technique to identify microcalcification regions, and use a stochastic thresholding method to detect the calcified spots. The combined perceptual techniques (such as regularization, visual group normalization and contrast nonlinear enhancement) produce natural high-quality images based on the human vision system. The underlying technologies significantly facilitate the creation of generic signal processing and computer-aided diagnostic (CAD) systems. The system is implemented in the JAVA language, which is cross-platform friendly and is facilitated for telemedicine application.

关键词： Digital signal processing

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Improved successive refinement for wavelet-based embedded image compression

Improved successive refinement for wavelet-based embedded im...

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Proceedings of the 1999 Wavelet Applications in Signal and image processing vii

作者： Creusere, Charles D. Naval Air Warfare Cent China Lake United States

In this paper we consider a new form of successive coefficient refinement which can be used in conjunction with embedded compression algorithms like Shapiro's EZW (Embedded Zerotree Wavelet) and Said & Pearlman's SPIHT (Set Partitioning in Hierarchical Trees). Using the conventional refinement process, the approximation of a coefficient that was earlier determined to be significant is refined by transmitting one of two symbols - an 'up' symbol if the actual coefficient value is in the top half of the current uncertainty interval or a 'down' symbol if it is in the bottom half. In the modified scheme developed here, we transmit one of 3 symbols instead - 'up', 'down', or 'exact'. The new 'exact' symbol tells the decoder that its current approximation of a wavelet coefficient is 'exact' to the level of precision desired. By applying this scheme in earlier work to lossless embedded compression (also called lossy/lossless compression), we achieved significant reductions in encoder and decoder execution times with no adverse impact on compression efficiency. These excellent results for lossless systems have inspired us to adapt this refinement approach to lossy embedded compression. Unfortunately, the results we have achieved thus far for lossy compression are not as good.

关键词： Wavelet transforms

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image processing benchmark study

Image processing benchmark study

引用

Conference on Machine Vision systems for Inspection and Metrology vii

作者： Miller, JWV Eddy, C Waltz, FM Hack, R Wood, J Stokes, D Univ Michigan Dept Elect & Comp Engn Dearborn MI 48128 USA

ISBN: (纸本)0819429821

This paper describes the benchmarking of image processing algorithms using high-performance workstations and personal desktop computers. For the various platforms evaluated which included machines from Sun, SGI, Apple, and Gateway, compiler options were varied to obtain the fastest execution times. algorithms evaluated included typical image processing operations such as derivatives, logical operations, morphology, subtraction, median filter, and the new SKIPSM approach. Data were collected using the different platforms and are presented here in tabular form. The results indicate that the latest generation of personal computers have processing capabilities that are similar to UNIX-based work stations.

关键词： benchmarking compiler optimization image processing image processing algorithms

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Metrics for image segmentation 7

Metrics for image segmentation

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Visual Information processing vii

作者： Rees, G Greenway, P Morray, D British Aerosp Sowerby Res Ctr Bristol Avon England

ISBN: (纸本)0819428361

An important challenge in mapping image-processing techniques onto applications is the lack of quantitative performance measures. From a systems engineering perspective these are essential if system level requirements are to be decomposed into sub-system requirements which can be understood in terms of algorithm selection and performance optimisation. Nowhere in computer vision is this more evident than in the area of image segmentation. This is a vigorous and innovative research activity, but even after nearly two decades of progress, it remains almost impossible to answer the question "what would the performance of this segmentation algorithm be under these new conditions?" To begin to address this shortcoming, we have devised a well-principled metric for assessing the relative performance of two segmentation algorithms. This allows meaningful objective comparisons to be made between their outputs. It also estimates the absolute performance of an algorithm given ground truth. Our approach is an information theoretic one. In this paper, we describe the theory and motivation of our method, and present practical results obtained from a range of state of the art segmentation methods. We demonstrate that it is possible to measure the objective performance of these algorithms, and to use the information so gained to provide clues about how their performance might be improved.

关键词： image segmentation image processing image processing algorithms and systems Cameras Machine vision Signal processing image acquisition Algorithm development Magnetorheological finishing Computer vision technology

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