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IEE Proceedings - Vision, Image and Signal Processing

Issue 4 • Date 30 Aug. 2004

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Displaying Results 1 - 13 of 13
  • Hierarchical multistream recognition of facial expressions

    Publication Year: 2004, Page(s):307 - 313
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (586 KB)

    Achieving optimal recognition accuracy, particularly under conditions of input data variability, is a challenge for automatic facial expression recognition. However, little research has been devoted to investigating the robustness of automatic expression recognition under adverse conditions. A facial expression modelling approach is proposed for enhancing the robustness of expression recognition. ... View full abstract»

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  • Smoothing transcoded MPEG-1 video streams for Internet transmission

    Publication Year: 2004, Page(s):298 - 305
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    An efficient smoothing scheme for the real-time transmission of MPEG-1 transcoded video over 'best-effort' IP networks is presented. The scheme uses intelligent partitioning and multiplexing of the packetised bit stream. Bit-rate smoothing is achieved by partitioning packets according to their picture type (I, P or B). Subsequently, the partitioned packets are multiplexed in such a way that each p... View full abstract»

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  • Target-cluster fusion approach for classifying high resolution IKONOS imagery

    Publication Year: 2004, Page(s):241 - 249
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4310 KB)

    To extract GIS features from high spatial resolution imagery is an important task in remote sensing applications. However, traditional pixel-based classification methods, which were developed in the era of 10-100 m ground pixel size imagery, cannot exploit the advantages of new images provided by IKONOS and QuickBird. This is due to the increase of the within-class variability inherent from more d... View full abstract»

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  • Fast algorithm for detecting a small signal in the presence of normally distributed noise

    Publication Year: 2004, Page(s):264 - 270
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    Where a small periodic signal is hidden in normally distributed noise, measurements in the tails of the distribution are much more sensitive to the presence of the signal than those closer to the mean. By calculating a power spectrum only of the extreme values, the signal can be retrieved at a slightly reduced statistical significance but with a substantially reduced calculational requirement. A s... View full abstract»

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  • Decimation schemes for ΣΔ A/D converters based on Kaiser and Hamming sharpened filters

    Publication Year: 2004, Page(s):287 - 296
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (365 KB)

    Cascaded-integrator-comb (CIC) filters are efficient anti-aliasing rate-conversion filters widely used for ΣΔ A/D converters. High-order structures, attempting to increase the noise rejection within the folding bands, have the drawback of inserting multiple zeros in the same positions and increasing the edge-band attenuation. A combination of sharpened and CIC filters is proposed in th... View full abstract»

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  • Harmonic transform

    Publication Year: 2004, Page(s):257 - 263
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    A new method of spectrum analysis, harmonic transform, is proposed to provide an impulse-train spectrum for signals that are comprised of time-varying harmonics. The essential concept of the transform and some of its properties are discussed. Based on the new transform, a short time harmonic transform is developed for time-frequency analysis. Simulation examples dealing with voiced speech show tha... View full abstract»

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  • Adaptive blind source separation of multiple-input multiple-output linearly time-varying FIR system

    Publication Year: 2004, Page(s):279 - 286
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (354 KB)

    A new adaptive blind separation scheme for sources mixed by a multiple-input multiple-output (MIMO) linearly time-varying (LTV) FIR system is proposed. First, by dividing measured samples into a series of short segments, time-varying coefficients of the mixing system are approximated by polynomials in time over each segment. Then, a two-step BSS scheme is presented for the approximated system. The... View full abstract»

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  • Remote walkthrough over mobile networks using 3-D image warping and streaming

    Publication Year: 2004, Page(s):329 - 336
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1190 KB)

    A mobile walkthrough environment based on 3-D superview warping and view compensation streaming is presented. In this environment, 3-D views are rendered on the remote clients using 3-D oversized reference views and compensated on a view-on-demand basis by the graphically rendered views from the server. The view compensations (hole residuals and the depth map) are coded using a layered joint sourc... View full abstract»

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  • Speech-driven facial animation using a hierarchical model

    Publication Year: 2004, Page(s):314 - 321
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (653 KB)

    A system capable of producing near video-realistic animation of a speaker given only speech inputs is presented. The audio input is a continuous speech signal, requires no phonetic labelling and is speaker-independent. The system requires only a short video training corpus of a subject speaking a list of viseme-targeted words in order to achieve convincing realistic facial synthesis. The system le... View full abstract»

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  • Rate-constrained arbitrarily shaped video object coding with object-based rate control

    Publication Year: 2004, Page(s):250 - 256
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    The authors develop an object-based rate control algorithm for MPEG-4 arbitrarily shaped video object coding. There are three main contributions. An improved quadratic rate-distortion model for texture information is derived, which is more accurate for arbitrarily shaped video objects. Secondly, an accurate rate-distortion model for shape information is introduced. Combining the rate-distortion mo... View full abstract»

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  • Structure adaptation of linear MMSE adaptive filters

    Publication Year: 2004, Page(s):271 - 277
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    The tap-length, or the number of the taps, is an important structural parameter of the linear MMSE adaptive filter. Although the optimum tap-length that balances performance and complexity varies with scenarios, most current adaptive filters fix the tap-length at some compromise value, making them inefficient to implement especially in time-varying scenarios. A novel gradient search based variable... View full abstract»

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  • Image tamper detection and classification using support vector machines

    Publication Year: 2004, Page(s):322 - 328
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The use of robust watermarks for attack characterisation is an area of considerable potential which has been largely overlooked to date. The authors extend their earlier work on accurate attack characterisation using a double watermarking technique to include a larger library of attacks. It is shown that the complexity of the double watermarking technique can be reduced with only a very small perf... View full abstract»

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  • Editorial - Special section from VIE 2003

    Publication Year: 2004, Page(s): 297
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    First Page of the Article
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