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Proceedings 1998 International Conference on Image Processing. ICIP98 (Cat. No.98CB36269)

7-7 Oct. 1998

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  • 1998 International Conference on Image Processing [front matter]

    Publication Year: 1998, Page(s):i - xlvi
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    Freely Available from IEEE
  • Index of authors

    Publication Year: 1998, Page(s):lvii - lxxi
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    Freely Available from IEEE
  • On the tradeoff between source and channel coding rates for image transmission

    Publication Year: 1998, Page(s):118 - 121 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    This paper is intended to investigate the bit rate allocation between source coding and channel coding rates when turbo codes are used to protect vector quantized images. The experimental results show that an appropriate bit rate allocation can lead to significant gains in the quality of the reconstructed images compared to an arbitrary bit rate allocation scheme. View full abstract»

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  • ROC curve evaluation of edge detector performance

    Publication Year: 1998, Page(s):525 - 529 vol.2
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (431 KB)

    We present a method of evaluating edge detector performance based on empirical receiver-operating characteristic (ROC) curves. The approach is based on using real images, for which the ground truth has been manually specified. The ROC curve for a given edge detector summarizes its range of tradeoffs between true positive and false positive edge pixels, as determined by comparing the detected edge ... View full abstract»

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  • Combining HMM classifiers in a handwritten text recognition system

    Publication Year: 1998, Page(s):934 - 938 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A study of several methods for combining information from two classifiers in a system for the recognition of handwritten text is presented. The system uses two hidden Markov models (HMMs) per character to model columns and rows of pixels in the character image. We show that the best method of combining the results from the vertical and horizontal classifiers is simply to multiply the probabilities... View full abstract»

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  • Improved segmentation through dynamic time warping for signature verification using a neural network classifier

    Publication Year: 1998, Page(s):929 - 933 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A segmentation technique based on dynamic time warping is investigated as a means of obtaining improved alignment between multiple signatures from a writer; the segments generated through this approach are represented by an autoregressive model. The signature verification performance is evaluated with a neural network based classifier, and shown to be a significant improvement over previous result... View full abstract»

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  • An interactive approach to image retrieval using multiple seed images

    Publication Year: 1998, Page(s):775 - 778 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The concept, procedure and tools for interactive image retrieval with multiple seed images are investigated in this research. Specifically, we consider an interactive query process in which the query can be refined so that the meaning of “similarity”: defined by a specific user for a particular application can be approached gradually. This idea is implemented by performing adaptive fil... View full abstract»

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  • Flexible face animation using MPEG-4/SNHC parameter streams

    Publication Year: 1998, Page(s):924 - 928 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    We describe a new approach to animating generic 3D wireframe models of human heads using MPEG-4 synthetic/natural hybrid coding (MPEG4/SNHC) facial definition parameters (FDP) points and facial animation parameters (FAP) streams. The FDP points are used to partition a head model into sections that have approximately conforming motion with human muscles. Using the borders of these sections as featu... View full abstract»

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  • Choosing the optimal neighbourhood size in optical flow problems with errors-in-variables modelling

    Publication Year: 1998, Page(s):186 - 190 vol.2
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    This paper brings together two research issues in optical flow estimation: the selection of the smoothing parameter and the proper treatment of the correlated noise in the partial derivatives of the image intensity. In previous work, the authors have developed an optical flow estimation method which properly treats the errors-in-variables problem cause by the correlated noise in the spatio-tempora... View full abstract»

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  • A fast effective scene change detection and adaptive rate control algorithm

    Publication Year: 1998, Page(s):379 - 382 vol.2
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The rate control algorithm of Test Model 5 (TM5) can not handle scene change properly, so the visual quality is consequently worsened. A fast effective scene changes detection method without much additional computation is proposed and an adaptive rate control algorithm is given, which not only guarantees the buffer not to overflow or underflow, but also compensates the visual degradation at scene ... View full abstract»

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  • Multi-image matching for a general motion stereo camera model

    Publication Year: 1998, Page(s):608 - 612 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The aim of motion stereo is to extract the 3-D information of an object from images of a moving camera using the geometric relationships between corresponding points. This paper presents an accurate and robust motion stereo algorithm employing multiple images, taken under a general motion. The object functions for individual stereo pairs are represented, with respect to the distance, then these ob... View full abstract»

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  • A video coder using 3-D model based background for video surveillance applications

    Publication Year: 1998, Page(s):919 - 923 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    We present a model based video coder for remote video surveillance applications at very low bit rates. Unlike the known model based video codecs, we use the model based approach for background modeling and not for “head-and-shoulders” modeling. Since in video surveillance the remote site that is being monitored is usually a previously known physically closed space, we build a 3-D model... View full abstract»

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  • Fixed point filter design for image enhancement using fuzzy logic

    Publication Year: 1998, Page(s):838 - 842 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    This paper presents a new fuzzy-logic-control based filter with the properties of removing impulsive noise and smoothing out Gaussian noise while, simultaneously, preserving edges and image details efficiently. To reach the above three goals of the image enhancement problem, we employ the concepts of fuzzy logic control to design a filter to perform all the three tasks mentioned above. This filter... View full abstract»

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  • Maximally flat bandwidth allocation for variable bit rate video

    Publication Year: 1998, Page(s):346 - 350 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    When a variable bit rate (VBR) video bitstream is transmitted into a network, the channel utilization is dependent on the maximum peak value of the traffic pattern and improved by reducing the peak rate. A lower bound on the transmission rate is derived from the given traffic cells. Based on the transmission rate constraint, the optimal bandwidth that is needed to meet the delay requirement during... View full abstract»

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  • Image/video scaling algorithm based on multirate signal processing

    Publication Year: 1998, Page(s):732 - 736 vol.2
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    This paper presents an approach for image and video scaling using multirate signal processing. The main objective is to scale images with an arbitrary rational scaling ratio without visible aliasing or distortion artifact. The approach can be applied to grey scale images, color images and video signals in both spatial domain and time domain. Cosine modulation is used to minimize the required on-ch... View full abstract»

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  • Isointensity directional smoothing for edge-preserving noise reduction

    Publication Year: 1998, Page(s):867 - 871 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Isointensity directional smoothing is a novel edge-preserving smoothing method. By fitting a polynomial hypersurface to the local intensity, isointensity bands (isobands) are derived which approximately parallel an edge when the centre pixel is close to the edge. Pixels in the isoband passing through the centre are assigned higher weights, while those in other isobands are assigned lower weights a... View full abstract»

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  • Improved H.263+ rate control via variable frame rate adjustment and hybrid I-frame coding

    Publication Year: 1998, Page(s):375 - 378 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A novel rate control algorithm consisting of two major components, i.e. a variable encoding frame rate method and a hybrid DCT/wavelet I-frame coding scheme, is proposed for low bit rate video coding. Most existing rate control algorithms for low bit rate video focus on bit allocation at the macroblock level under a constant frame rate assumption. The proposed rate control algorithm is able to adj... View full abstract»

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  • Digital surfaces as a basis for building isosurfaces

    Publication Year: 1998, Page(s):977 - 981 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    This work highlights the relation existing between isosurfaces of an image with a given threshold (as classically computed by a marching-cubes algorithm) and digital surfaces of this thresholded image. The first step has been to extend the classical adjacency relation defined between elements of a digital surface. It turns out that the induced surface graphs are 2D combinatorial manifolds without ... View full abstract»

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  • Efficient algorithms for embedded rendering of terrain models

    Publication Year: 1998, Page(s):914 - 918 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Digital terrains are generally large files and need to be simplified to be rendered efficiently. We propose to build an adaptive embedded triangulation based on a binary tree structure to generate multiple levels of details. We present a O(nlogn) decimation algorithm and a O(nlogn) refinement algorithm, where n is the number of elevation points. We compare them in a rate-distortion (RD) framework.... View full abstract»

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  • Iterative determination of local bound constraints in iterative image restoration

    Publication Year: 1998, Page(s):833 - 837 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    In this paper, the problem of how to better estimate spatially adaptive intensity bounds for image restoration is addressed. When the intensity bounds are estimated from a degraded image, blurring leads to underestimation of the bounds in the edge and texture regions. Therefore, an iterative implementation of the restoration algorithm has been proposed in which the intensity bounds are re-estimate... View full abstract»

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  • Iterative inversion of the Radon transform using image-adaptive wavelet constraints

    Publication Year: 1998, Page(s):709 - 713 vol.2
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Sahiner and Yagle (1992, 1993, 1995) developed a procedure for image reconstruction from projections under wavelet-domain image constraints (WC). We constrain the wavelet transform (WT) of the noisy image to zero in WT regions determined by thresholding the WT of the noisy image. The least-squares image satisfying these constraints shows improved reconstruction not just in the constrained region, ... View full abstract»

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  • Transcoding of MPEG video using lattice vector quantization

    Publication Year: 1998, Page(s):341 - 345 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    We propose a new transcoding method for MPEG video bit-streams. In our implementation, instead of using scalar quantization in the transcoder, a lattice vector quantizer (LVQ) is applied to exceed the MPEG compression capabilities while providing acceptable quality. In this way, the transcoded video is not MPEG-compatible anymore, hence a low cost user interface is needed prior to the MPEG decodin... View full abstract»

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  • Regularized iterative image sequence interpolation with spatially adaptive constraints

    Publication Year: 1998, Page(s):470 - 473 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    We propose an image interpolation algorithm based on the regularized iterative image restoration method. By adopting spatial adaptive constraints in each regularized iteration step, the proposed algorithm provides a better interpolated image from the image sequence than the conventional non-adaptive interpolation algorithms. Due to its spatially adaptive nature, it can be applied to the general im... View full abstract»

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  • A neural network based scheme for unsupervised video object segmentation

    Publication Year: 1998, Page(s):632 - 636 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    We propose a neural network based scheme for performing unsupervised video object segmentation, especially for videophone or videoconferencing applications. The procedure includes (a) a training algorithm for adapting the network weights to the current condition, (b) a maximum a posteriori (MAP) estimation procedure for optimally selecting the most representative data of the current environment as... View full abstract»

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  • Predictive-transform residual vector quantization

    Publication Year: 1998, Page(s):584 - 588 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1244 KB)

    This work investigates a new compression scheme that incorporates rate-constrained residual vector quantization (RVQ) of the transform coefficient error vectors arising in a minimum mean squared error (MMSE) predictive-transform (PT) methodology. The proposed technique that we call predictive-transform residual vector quantization (PTRVQ) exploits the correlation between neighboring blocks by pred... View full abstract»

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