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

共 86 条记录，以下是41-50 订阅

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Hierarchical spatial spectral processing for road mapping

Hierarchical spatial spectral processing for road mapping

引用

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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Effects of star crossings on the detection of dim objects in orbit and mitigation strategies for improving detection

Effects of star crossings on the detection of dim objects in...

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Conference on Sensors and systems for Space Applications vii

作者： Gessel, B. Cain, S. Air Force Inst Technol Dayton OH 45433 USA

ISBN: (纸本)9781628410228

Detecting objects in space that are potentially hazardous to satellites or our population is an important problem that is growing every year as more objects are launched and collisions between objects introduce more debris. The problem of detecting these objects using Earth-based optical telescopes is challenging, but is generally dictated by available light and atmospheric seeing conditions. In this paper a related problem is described and demonstrated involving the detection of objects that are near brighter objects like stars. Starlight creates the expected problem of increasing the amount of noise and extra light in the region around it, but in this paper the effect of spatial operations carried out by traditional space object detection algorithms is factored in. These spatial processing effects magnify the contribution of stray starlight and cause large zones around stars to form that make detection of any space debris within them very difficult. This paper documents a new algorithm that can mitigate this effect and facilitate the detection of objects near stars.

关键词： Space Situational Awareness Space Debris image processing

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Nonlinear mapping of the luminance in dual-layer high dynamic range displays

Nonlinear mapping of the luminance in dual-layer high dynami...

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Conference on image processing - algorithms and systems vii

作者： Guarnieri, Gabriele Ramponi, Giovanni Bonfiglio, Silvio Albani, Luigi Univ Trieste DEEI Image Proc Lab Trieste Italy FIMI Philips Saronno Italy

ISBN: (纸本)9780819474957

It has long been known that the human visual system (HVS) has a nonlinear response to luminance. This nonlinearity can be quantified using the concept of just noticeable difference (JND), which represents the minimum amplitude of a specified test pattern an average observer can discern from a uniform background. The JND depends on the background luminance following a threshold versus intensity (TVI) function. It is possible to define a curve which maps physical luminances into a perceptually linearized domain. This mapping can be used to optimize a digital encoding, by minimizing the visibility of quantization noise. It is also commonly used in medical applications to display images adapting to the characteristics of the display device. High dynamic range (HDR) displays, which are beginning to appear on the market, can display luminance levels outside the range in which most standard mapping curves are defined. In particular, dual-layer LCD displays are able to extend the gamut of luminance offered by conventional liquid crystals towards the black region;in such areas suitable and HVS-compliant luminance transformations need to be determined. In this paper we propose a method, which is primarily targeted to the extension of the DICOM curve used in medical imaging, but also has a more general application. The method can be modified in order to compensate for the ambient light, which can be significantly greater than the black level of an HDR display and consequently reduce the visibility of the details in dark areas.

关键词： High dynamic range (HDR) Medical displays Visual perception models DICOM Just noticeable difference (JND) Ambient light Nonlinear mapping Quantization

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OPERATIONS AND ARCHITECTURES DEVELOPED ON THE IP-512 image processing FAMILY.

OPERATIONS AND ARCHITECTURES DEVELOPED ON THE IP-512 IMAGE P...

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Applications of Digital image processing vii.

作者： Beg, Rashid Corbett, Fran Imaging Technology Inc Woburn MA USA Imaging Technology Inc Woburn MA USA

ISBN: (纸本)0892525398

This paper deals with the development of a general architecture for image processing after considering important aspects of image processing algorithms commonly used today. The algorithms are linked by mutual operations and using this fact leads to architecture suitable for a wide variety of operations. An architecture will be developed that spans a wide range of functionality through systematic expansion, making it fit for low cost production and commercial consumption. It is also the intent of this paper to introduce a general theory about such systems, and to provoke further thinking along these lines.

关键词： image processing

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ANATOMY BASED MULTIMODAL MEDICAL image REGISTRATION FOR COMPUTER-INTEGRATED SURGERY 7

ANATOMY BASED MULTIMODAL MEDICAL IMAGE REGISTRATION FOR COMP...

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Sensor Fusion vii Conference

作者： HAMADEH, A CINQUIN, P SZELISKI, R LAVALLEE, S FAC MED GRENOBLE TIMCIMAGF-38700 LA TRONCHEFRANCE

ISBN: (纸本)0819416908

In Computer Assisted Surgery, the registration between pre-operative images, intra-operative images, anatomical models and guiding systems such as robots is a crucial step. This paper presents the methodology and the algorithms that we have developed to address the problem of rigid-body registration in this context. Our technique has been validated for many clinical cases where we had to register 3D anatomical surfaces with various sensory data. These sensory data can have 3D representation (3D images, range images, digitized 3D points, 2.5D ultrasound data) or they can be 2D projections (X-ray images, video images). This paper presents an overview of the results we have obtained.

关键词： image registration image segmentation 3D modeling 3D image processing Sensors Surgery image fusion Ultrasonography X-rays X-ray imaging

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An algorithm for the estimation of the in-focus distance for speckle holograms

An algorithm for the estimation of the in-focus distance for...

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Conference on Optical Measurement systems for Industrial Inspection vii

作者： Memmolo, P. Distante, C. Paturzo, M. Finizio, A. Ferraro, P. Javidi, B. CNR Ist Nazl Ott Via Campi Flegrei 34 I-80078 Pozzuoli NA Italy Univ Napoli Federico II DIBET I-80125 Naples Italy CNR Ist Nazl Ott I-73010 Arnesano LE Italy Univ Connecticut Elect & Comp Engn Dept Storrs CT 06269 USA

ISBN: (纸本)9780819486783

Searching and recovering the correct reconstruction distance in digital holography can be a cumbersome and subjective procedure. Here we show an algorithm for the automatically estimating the in-focus image and recovering the correct reconstruction distance for speckle holograms. We have tested the approach in determining the reconstruction distances of stretched digital holograms. Stretching a hologram with a variable elongation parameter gives us the possibility to change the in-focus distance of the reconstructed image. In this way, the proposed algorithm can be verified at different distances by dispensing the recording of different holograms. Experimental results are shown with the aim to demonstrate the usefulness of the proposed method and a comparative analysis has been performed with respect to other existing algorithms developed for digital holography.

关键词： Digital holography Digital image processing

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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...

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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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Laser radar array used for improving image analysis algorithms

Laser radar array used for improving image analysis algorith...

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Intelligent Robots and Computer Vision vii 1988

作者： Cullen, Mark F. De Groot, Peter J. Gallatin, Gregg M. Perkin-Elmer Corporation Artificial Intelligence Laboratory 25 Science Park New HavenCT06511 United States

In this paper we report on a system that incorporates laser ranging data with reflectance data for improved performance in an object recognition task. A new laser diode-based radar array developed at Perkin-Elmer provides simultaneous coherent ranging and velocimetry data for multiple points in an image scene. The device consists of simple optics and non-mechanical components and is compact and simple to use. While the hardware expansion to higher density laser diode arrays continues, we have designed parallel signal processing algorithms to process the raw data for image analysis applications. We discuss how this information is used to improve the performance of a model-based object recognition system. The results of this research have immediate application to robotics vision and space docking systems, and longer term application in terrain mapping and image scene analysis as the signal performance is improved. © 1989 SPIE. All rights reserved.

关键词： Object recognition

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NSF-supported undergraduate machine vision research activities

NSF-supported undergraduate machine vision research activiti...

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Conference on Machine Vision systems for Inspection and Metrology vii

作者： Miller, JWV Shridhar, M Univ Michigan Dearborn MI 48128 USA

ISBN: (纸本)0819429821

For the past three summers, students at the University of Michigan-Dearborn have been participating in the development and testing of various aspects of machine vision systems with support from the National Science Foundation under the Research Experiences for Undergraduates (REU) program. Much of the work has involved algorithm development since useful work can be performed with a fairly modest programming background. Benchmarking of various algorithms is a related activity that has seen much student participation. To a lesser extent, illumination and optics work has also been performed for the development of experimental setups and actual implementation of vision systems. Over the three-year duration of the program, a total of 34 students participated in these activities. While many of the participants were full-time students at the University of Michigan-Dearborn, others were from engineering colleges over a diverse geographical area. Summaries of a number of the projects is included here. It may be noted that the National Science Foundation has established the REU program to encourage more students to obtain advanced degrees in science and engineering and ultimately to pursue careers in research and development.

关键词： Machine vision Cameras Glasses image filtering image processing Algorithm development Computer programming Software development 3D modeling 3D scanning

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High resolution image reconstruction of digital video with non-global rigid body motion 7

High resolution image reconstruction of digital video with n...

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Visual Information processing vii

作者： Tuinstra, TR Hardie, RC Univ Dayton Dept Elect & Comp Engn Dayton OH 45469 USA

ISBN: (纸本)0819428361

Many imaging systems utilize detector arrays that are not sufficiently dense to sample the scene according to the Nyquist criterion. As a result of this undersampling, some of the higher spatial frequencies admitted by the optics are aliased to lower frequency representations in the sampled image. This creates undesirable artifacts that decrease the utility of the imagery. Furthermore, the blurring effects of the optics and the finite detector size also degrade the image quality. Several approaches for obtaining a higher sampling rate have been suggested in the literature such as controlled and uncontrolled microscanning or from natural camera platform motion in order to up-sample the scene. Here we extend this work to include the possibility of non-global rigid body motion. In particular, we show that the motion of rigid objects within the scene is in many cases sufficient to allow the up-sampling of the object. We present a method that makes use of optical-flow-based motion segmentation techniques to isolate moving objects from the background in a sequence of digital images. These segmented objects from each frame provide a unique "look" or set of samples of the object, allowing us to perform a reconstruction of the object. This allows for high resolution image reconstruction of each segmented object independently. The experimental results presented illustrate the breakdown of global reconstruction algorithms in the presence of nonglobal rigid motion. We also present results using the proposed method that treats individual moving objects and background separately. The results include data from a visible CCD camera.

关键词： optical flow digital video processing electronic zooming image reconstruction high resolution motion segmentation

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