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Image Processing, 1996. Proceedings., International Conference on

Date 19-19 Sept. 1996

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  • International Conference on Image Processing

    Publication Year: 1996 , Page(s): iii - xlv
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    Freely Available from IEEE
  • New subband geometries for image texture segmentation

    Publication Year: 1996 , Page(s): 971 - 974 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (626 KB)  

    The usefulness of multichannel filtering for image texture segmentation has been demonstrated in the literature. Based on psychophysical studies, it has been largely believed that Gabor filters are optimal for segmentation. In this paper, the application of maximally decimated, non-separable, perfect reconstruction filter banks (subband systems) are investigated for texture segmentation. The subba... View full abstract»

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  • On-line holographic reconstruction of NMR images by means of a liquid crystal spatial light modulator

    Publication Year: 1996 , Page(s): 531 - 534 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (512 KB)  

    A method of holographic reconstruction of nuclear magnetic resonance (NMR) images by making a hologram directly from the NMR signal is described. Since the signal obtained in NMR Fresnel transform technique is given by an equation similar to that of the Fresnel diffraction equation in light, it is possible to reconstruct NMR images by recording the NMR signal as a hologram and using a coherent opt... View full abstract»

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  • Evaluating effective resolution of an optical tomographic imaging system using a narrow-band correlation metric

    Publication Year: 1996 , Page(s): 535 - 538 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (296 KB)  

    An eight-view optical tomographic imaging system is currently in use to measure index of refraction changes within a heated air flow. Analysis of system performance requires a method for evaluating the accuracy of tomographic reconstructions as a function of the spatial frequency of structures within the air flow. A narrow-band spatial frequency correlation metric has been used to evaluate perform... View full abstract»

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  • 3-D histogram modification of color images

    Publication Year: 1996 , Page(s): 1015 - 1018 vol.3
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (716 KB)  

    While histogram modification has traditionally been used for the enhancement of color images, it has usually been restricted to processing the luminance component and, in some cases, the saturation. Reducing the problem's dimensionality in this manner generally sacrifices the ability to make full use of the color space gamut. Presented here are two novel color image contrast enhancement approaches... View full abstract»

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  • Regularized blur-assisted displacement field estimation

    Publication Year: 1996 , Page(s): 85 - 88 vol.3
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (468 KB)  

    Due to the finite acquisition time of practical cameras, objects can move during image acquisition, therefore introducing motion blur degradations. Traditionally, these degradations are treated as undesirable artifacts that should be removed before further processing. We consider the use of motion blur as an indication of scene motion. We present two robust regularized motion estimation algorithms... View full abstract»

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  • A shape-adaptive transform for object-based coding

    Publication Year: 1996 , Page(s): 347 - 350 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (428 KB)  

    The efficient representation of image texture on arbitrarily shaped regions of support is an important problem to be solved in region-based coding schemes. One solution for smooth signals is the use of a linear transform, in order to achieve decorrelation and energy concentration for the input signal. In this paper, a general formulation for a class of shape adaptive transforms, that includes some... View full abstract»

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  • Computations in astro-imaging

    Publication Year: 1996 , Page(s): 113 - 116 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (452 KB)  

    This work involves two-stage approaches to enhancing the quality of images taken through the atmosphere. First, a control problem arising in adaptive-optics is discussed. The problem involves optimal real-time control of very fast-acting deformable mirrors designed to compensate for atmospheric turbulence and other image degradation factors, such as wind-induced telescope vibration (windshake). Th... View full abstract»

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  • Integrated approach to texture segmentation using multiple Gabor filters

    Publication Year: 1996 , Page(s): 955 - 958 vol.3
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (688 KB)  

    This paper presents an integrated approach using multiple Gabor filters for the segmentation of multi-textured images. The approach includes both the design of the constituent Gabor filters and the design of the classifier and postprocessing. The classifier uses a mixture density to reduce localization error at texture boundaries, and the postprocessing uses morphological operators to remove spuri... View full abstract»

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  • Reconstruction of two-dimensional light intensity distribution from the data of photo-count experiments

    Publication Year: 1996 , Page(s): 555 - 558 vol.3
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    An analytical method to recover the two-dimensional probability density function (PDF) of a random light field from the PDF of photon counts is presented. Some illustration of the inversion procedure are presented with application to the problem of light intensity interferometry View full abstract»

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  • Motion classified 3D vector quantization for sequence coding

    Publication Year: 1996 , Page(s): 275 - 278 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (548 KB)  

    This paper proposes a new strategy to code image sequences using motion classified 3D vector quantization (MC3DVQ). Typical VQ based sequence coding schemes perform interframe coding by means of label replenishment only at temporally stationary regions, while intraframe coding is applied to the temporally changing (with motion) regions. The proposed algorithm differs from these methods in such a w... View full abstract»

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  • Motion estimation and tracking for urban traffic monitoring

    Publication Year: 1996 , Page(s): 787 - 790 vol.3
    Cited by:  Papers (11)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (928 KB)  

    The use of traffic monitoring techniques based on image processing algorithms for supervising urban vehicle flows could be very useful. Classical inductive loops can only compute traffic density on a single lane but are unable to estimate, for example, the behaviour of the vehicle flow at a crossroad. In this paper a system that estimates the turning rates at an urban crossroad by processing the s... View full abstract»

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  • On entropy coded and entropy constrained lattice vector quantization

    Publication Year: 1996 , Page(s): 419 - 422 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (420 KB)  

    Two lattice vector quantization methods are compared. The first, classical method uses Dirichlet domains of lattice points as quantization cells and assigns them reconstruction vectors minimizing the distortion. The second method uses the lattice as codebook but modifies the shapes of the quantization cells by searching for each input vector the mapping onto either the nearest lattice points or on... View full abstract»

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  • New Hausdorff distances based on robust statistics for comparing images

    Publication Year: 1996 , Page(s): 21 - 24 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (356 KB)  

    A Hausdorff distance (HD) is one of commonly used measures for object matching. It calculates the distance between two point sets of edges in two-dimensional binary images without establishing correspondences. This paper analyzes the conventional HD measures based on robust statistics, and proposes robust HD measures based on M-estimation, least trimmed square (LTS), and α-trimmed mean metho... View full abstract»

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  • Maximum segmented-scene spatial entropy thresholding

    Publication Year: 1996 , Page(s): 963 - 966 vol.3
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (416 KB)  

    The segmented-scene spatial entropy (SSE) is defined as the amount of information contained in the spatial structure of a segmented scene resulting from segmenting an image. An automatic, nonparametric, unsupervised thresholding algorithm that maximizes the SSE of an image is described, and this algorithm is known as the maximum segmented-scene spatial entropy (MSSE) thresholding algorithm. It is ... View full abstract»

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  • Self-similar texture characterization using Wigner-Ville distribution

    Publication Year: 1996 , Page(s): 141 - 144 vol.3
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    Fractals have been successfully used to model “natural” shapes and forms. While using the fractal model, the most important procedure is measuring the fractal parameter H (the Hurst coefficient), which is directly related to the fractal dimension. The Wigner-Ville distribution (WVD) is a time-frequency representation with excellent time and frequency resolutions. We propose a one dimen... View full abstract»

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  • Restoration of uncertain blurs using an error in variables criterion

    Publication Year: 1996 , Page(s): 81 - 84 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (300 KB)  

    In image-restoration problems involving a known blur, set-theoretic estimation provides an effective framework for incorporation of both noise statistics and a priori information. However, the sets formulated for use with known blurs are not suitable for situations involving unknown stochastic blurs. In this paper, new sets based on an error in variables criterion are developed, which are more app... View full abstract»

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  • Using DGPS trajectory to evaluate an ortho-rectification method designed for flash radar images

    Publication Year: 1996 , Page(s): 891 - 894 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (956 KB)  

    The airborne flash SAR is a versatile device to produce high resolution radar images. In order to produce ortho-images, the distortions due to the complex real trajectory, system errors, and terrain elevation must be rectified. We have conceived (and previously presented) a rectification method specific to the flash radar. To estimate the quality of the rectification and the limit of our method (a... View full abstract»

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  • A modular neural network vector predictor for predictive VQ

    Publication Year: 1996 , Page(s): 431 - 434 vol.3
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1320 KB)  

    In this paper, we present a modular neural network vector predictor in order to improve the predictive component of a predictive vector quantization (PVQ) scheme. The proposed vector prediction technique consists of five dedicated predictors (experts), where each expert predictor is optimized for a particular class of input vectors. An input vector is classified into one of five classes based on i... View full abstract»

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  • Effects of noise pre-filtering for codebook generation in vector quantization

    Publication Year: 1996 , Page(s): 455 - 458 vol.3
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (704 KB)  

    Encoding noisy data is a challenging problem in data compression. Recent results show that data compression and filtering are closely related. Exploiting these ideas, we propose a simple technique for vector quantization (VQ) coding of noisy images, based on pre-filtering only the training set prior to codebook design. We find that our technique results in significant improvement in image quality,... View full abstract»

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  • A simple edge-sensitive image interpolation filter

    Publication Year: 1996 , Page(s): 711 - 714 vol.3
    Cited by:  Papers (39)  |  Patents (46)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (480 KB)  

    A novel scheme for edge-preserving image interpolation is introduced, which is based on the use of a simple nonlinear filter which accurately reconstructs sharp edges. Simulation results show the superior performances of the proposed approach with respect to other interpolation techniques View full abstract»

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  • Optimal bit allocation for video coding under multiple constraints

    Publication Year: 1996 , Page(s): 403 - 406 vol.3
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (304 KB)  

    We consider optimal encoding of video sequences (for ATM networks) under buffer and channel constraints. For independent coding, we develop an algorithm which employs multiple Lagrange multipliers to find the constrained optimal bit allocation, Simulation results are presented. We also compare the coded video quality and other characteristics of variable bit-rate and constant bit-rate transmission View full abstract»

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  • Verification of persons via face and signature analysis

    Publication Year: 1996 , Page(s): 495 - 498 vol.3
    Cited by:  Papers (1)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (312 KB)  

    This article proposes a new approach for verification of people. The model consists of two parts: face and signature analysis. For face information processing morphological filtering is used to enhance the intrinsic features of a face, reduce the influence of rotation in depth, changes in facial expression, hair style, glasses and lighting conditions. The filtered images are then a subject for lea... View full abstract»

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  • Model-based recognition of planar objects using geometric invariants

    Publication Year: 1996 , Page(s): 603 - 606 vol.3
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB)  

    We address the problem of recognizing possibly occluded planar objects from an arbitrary viewpoint. The primitives used either to obtain models or to recognize the planar shapes are the so called metasegments. These are groups of consecutive segments obtained from the corners of the objects' contours. From these groups of segments a set of geometric invariants: two new (the type and the subtype), ... View full abstract»

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  • Curve segmentation by continuous smoothing at multiple scales

    Publication Year: 1996 , Page(s): 579 - 582 vol.3
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (360 KB)  

    In the case of curve description, the accurate and precise estimation of corners plays an important role. Corners exhibit a high change of curvature κ', so we propose the location of them by means of the estimation of κ' at different scales of smoothing. The main problem arises when the curvature is computed because of the inherent quantization. We propose to calculate the curvature of... View full abstract»

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