1998 IEEE Southwest Symposium on Image Analysis and Interpretation (Cat. No.98EX165)

5-7 April 1998

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  • 1998 IEEE Southwest Symposium on Image Analysis and Interpretation (Cat. No.98EX165)

    Publication Year: 1998
    Request permission for reuse | PDF file iconPDF (386 KB)
    Freely Available from IEEE
  • Removal of image defocus and motion blur effects with a nonlinear interpolative vector quantizer

    Publication Year: 1998, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1476 KB)

    In this paper, results are presented which demonstrate the removal of image defocus and motion blur effects using an algorithm based on nonlinear interpolative vector quantization (NLIVQ). The algorithm is trained on original and diffraction-limited image pairs which are representative of the class of images of interest. The discrete cosine transform is used in the code-book design process to cont... View full abstract»

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  • VIMOS: a video mosaic for spatio-temporal representation of visual information

    Publication Year: 1998, Page(s):6 - 11
    Cited by:  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (787 KB)

    The capability of extracting critical information from a live video signal and presenting it to end-users in an easy-to-grasp form is essential in many application domains, including GIS, intelligence, surveillance, and manufacturing. We outline on the development of methods and algorithms that are necessary for real-time analysis of video data, both in compressed or uncompressed domains, the gene... View full abstract»

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  • Scene change detection in MPEG domain

    Publication Year: 1998, Page(s):12 - 17
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (586 KB)

    Video is an important and challenging media and requires sophisticated indexing schemes for efficient retrieval from visual databases. Video segmentation is a fundamental step in video indexing and involves detection of scene changes. In this paper, we propose a fast and robust algorithm for detecting video shot boundaries in the MPEG-2 compressed bitstream with minimal decoding. View full abstract»

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  • Convex projections restoration of Hadamard naturalness-preserving transform coded images

    Publication Year: 1998, Page(s):18 - 22
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (690 KB)

    This paper investigates an image coding system using the Hadamard naturalness-preserving transform (HNPT). It focuses both on the encoding and the decoding processes. Symmetric Lloyd-Max quantizers are designed to encode the HNPT coefficients. The theory of projections onto convex sets (POCS) is used as a basis for the design of an iterative reconstruction algorithm. A constraint set is defined th... View full abstract»

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  • Microcalcification cluster detection in digitized mammograms using multiscale techniques

    Publication Year: 1998, Page(s):23 - 28
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (882 KB)

    The introduction of multiscale techniques to signal and image processing has provided a new tool to create innovative methods for solving problems in the areas of data compression, signal analysis, and noise removal. Although these techniques are popular and used extensively in research and in engineering applications, their use in signature detection and classification is still an area open to ex... View full abstract»

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  • Morphological and related image processing techniques for the detection of microcalcifications in mammographic images

    Publication Year: 1998, Page(s):29 - 34
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (669 KB)

    This paper describes a simple technique for locating microcalcifications in digital mammograms. These methods use the fact that many smoothing techniques are never applied to mammograms as they erase the important features. This is turned to an advantage by subtracting the smoothed image from the original, thus leaving only the important features. A variety of smoothers and enhancers are applied t... View full abstract»

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  • Compression degradation metrics for analysis of consistency in microcalcification detection

    Publication Year: 1998, Page(s):35 - 40
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (763 KB)

    The authors motivate, define and illustrate the behavior of four scalar metrics which measure the degree to which microcalcification (/spl mu/uCa++) detection is affected by lossy compression distortion. The JPEG method is used at various compression rates determined by a single parameter. The authors' metrics are specifically targeted to measure the degree of invariance of the processing to the p... View full abstract»

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  • Modeling of growth via active contour models

    Publication Year: 1998, Page(s):41 - 46
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (610 KB)

    The authors analyze the growth of biological specimens with the help of Active Contour Models known as Snakes. Conventional shape-change models like optical flow, deformable templates, etc., primarily address rigid and non-rigid deformations which are not in the form of growth. Moreover the above models assume the shape-change between successive frames in an image sequence to be small which is not... View full abstract»

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  • Adaptive reconstruction using multiple views

    Publication Year: 1998, Page(s):47 - 52
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    This paper introduces a novel algorithm for extracting the optical flow obtained from a translating camera in a static scene. Occlusion between objects is incorporated as a natural component in a scene reconstruction strategy by first evaluating and reconstructing the foreground and then excluding its influence on the partly occluded objects behind. View full abstract»

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  • Semi-automatic methods and segmentation of hyphal images

    Publication Year: 1998, Page(s):53 - 58
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    The underlying aim of this research is to characterise the growth and morphology of arbuscular mycorrhizal hyphal distributions (i.e. spatial distributions of hyphae from a type of fungus), in order to enable assessment of efficiency of hyphal colonisation of a growth medium relative to localised variations in nutrient availability. Patterns of distribution are likely to have a profound influence ... View full abstract»

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  • Segmentation strategies with multiple analysis for an SMD object recognition system

    Publication Year: 1998, Page(s):59 - 64
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (578 KB)

    We present two segmentation strategies that use multiple analysis for the preprocessing stage of an object recognition system to detect the presence of surface mounted devices (SMD) on printed circuit boards. This work concentrates only on the preprocessing stage and simple segmentation algorithms for fast real-time implementation. The system uses two images of the same scene, with top and side il... View full abstract»

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  • Use of diffusion techniques for edge preservation for fractal coders

    Publication Year: 1998, Page(s):65 - 69
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    Based on the correlation of self-similarity, fractal coders compress digital images by relating image blocks pairs at different scales in the images. The pairing of large to small block sizes dictates the compression ratio and the quality of the reconstructed image. Inaccurate fractal mappings at large image block sizes increase losses of edge information, discontinuities at boundaries and blockin... View full abstract»

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  • Automated segmentation of surface soil moisture from Landsat TM data

    Publication Year: 1998, Page(s):70 - 74
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (761 KB)

    This study demonstrates a method for satellite remote sensing of surface soil moisture and the automated segmentation of the acquired imagery. The remote sensing method exploits the relationship between surface radiant temperature, vegetation cover, and surface soil moisture. The segmentation process employs a watershed algorithm applied within a morphological image pyramid. This multi-resolution ... View full abstract»

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  • Multi-resolution vegetation classification along lower Rio Grande

    Publication Year: 1998, Page(s):75 - 80
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (666 KB)

    We present a quasi-wavelet based approach for multiresolution unsupervised and supervised vegetation classification of videography imagery. Due to certain limitations of traditional wavelet decomposition, we investigate a new quasi-wavelet decomposition to generate an alternative feature space for vegetation classification. Most existing wavelet-based classification approaches only consider the in... View full abstract»

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  • Hierarchical classification of SAR data using a Markov random field model

    Publication Year: 1998, Page(s):81 - 86
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1201 KB)

    A general framework is presented for classifying coastal environments using synthetic aperture radar (SAR) data. This framework addresses two main issues associated with the accurate classification of SAR data: 1) the variability in radar backscatter of a given pixel caused by the presence of speckle in the imagery and 2) the characteristic decrease in intensity as a function of incidence angle. T... View full abstract»

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  • A robust registration technique for multi-sensor images

    Publication Year: 1998, Page(s):87 - 90
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (590 KB)

    This paper describes an improved technique to register multi-sensor images by segmenting the images by adaptive clustering prior to performing preprocessing and cepstrum operation to determine the translational displacement. The difficulty in registering multi sensor images lies in the fact that the images of the same scene acquired by different sensors often appear different in detailed structure... View full abstract»

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  • Visual perception tools for natural interaction - a gaze capture and tracking system

    Publication Year: 1998, Page(s):91 - 96
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (889 KB)

    In this paper we present a vision system with the aim of building a perceptual tool in order to make machines aware of humans allowing natural interaction in human-machine communication. The system must satisfy interaction constraints and be non-intrusive. Such a real-time camera-based system is designed for gaze tracking from an image sequence of a human in front of a machine. Therefore we use a ... View full abstract»

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  • Lexicodes in the space of foot patterns for image classification

    Publication Year: 1998, Page(s):97 - 102
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    In this paper we extend work presented in Ashlock and Davidson (1997) on the automatic classification of textures with foot patterns. We begin by verifying that a technique suggested in the earlier research permits us to distinguish between textures which the original technique could not classify. We then define a metric on the space of the foot patterns and construct lexicodes of the foot pattern... View full abstract»

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  • Texture classification using combined feature sets

    Publication Year: 1998, Page(s):103 - 108
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    We consider two methods to combine texture descriptions for classification: a composite feature vector which combines data additively, and an extended k-nearest-neighbour (KNN) rule which returns a decision based on the highest confidence in features, both aimed to improve classification capability. These have been used to combine a wide range of relatively simple texture features, and have been s... View full abstract»

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  • High-scale edge study for segmentation and contour closing in textured or noisy images

    Publication Year: 1998, Page(s):109 - 114
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    When they are used in a high-scale way, the edge detectors based on Canny's approach provide edges which are well localized in non-noisy and non-textured areas of the image, but which are too numerous in other areas. The aim of this paper is to study these high-scale edges, especially their local density. High-scale edges are studied by the way of features which characterize various situations suc... View full abstract»

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  • The moires of circles

    Publication Year: 1998, Page(s):115 - 120
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (843 KB)

    This paper deals with the moire effects that are observed when we draw, on a computer screen, the family of all the concentric circles of integer radius less or equal to R with R efficiently large. The goal of this article is to give an explanation of the phenomenon using the fact that the circles that are drawn on a screen are not real ones but "discrete ones". View full abstract»

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  • Projected mean curvature smoothing for vector-valued imagery

    Publication Year: 1998, Page(s):121 - 126
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    In this note, we formulate a general modified mean curvature based equation for image smoothing and enhancement. The key idea is to consider the image as a graph in some R/sup n/, and apply a mean curvature type motion to the graph. We consider some special cases relevant to greyscale and color images. View full abstract»

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  • Systolic algorithm for processing RLE images

    Publication Year: 1998, Page(s):127 - 131
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (435 KB)

    Image difference operation is commonly used in on-line automated printed circuit board (PCB) inspection systems as well as many other image processing applications. In this paper, we describe a new systolic algorithm and its system architecture which computes image differences in run-length encoded (RLE) format. The efficiency of this operation greatly affects the overall performance of the inspec... View full abstract»

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  • Protein structure determination using 3-D grayscale skeletonization

    Publication Year: 1998, Page(s):132 - 136
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    This paper describes ongoing work on an algorithm for performing 3-D grayscale skeletonization. The algorithm makes use of a variation of the gray weighted distance transform without performing any prior thresholding. It is being developed as a tool for structural biologists to utilize in determining the structure of large protein molecules. View full abstract»

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