By Topic

IEE Proceedings - Vision, Image and Signal Processing

Issue 5 • Date Oct 1995

Filter Results

Displaying Results 1 - 12 of 12
  • Two-stage decomposition of the DCT

    Publication Year: 1995, Page(s):319 - 326
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    The DCT kernel matrix is first decomposed into a block diagonal structure (BDS) with diagonal skew-circular correlated (SCCR) sub-matrices of length 2, 4, ..., N/2 by coset decomposition, and then each of these independent SCCR sub-matrices is further split into two stages by decomposing its elements into a linear combination of other simple basis functions. The preprocessing stage can be treated ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Thresholding based on histogram approximation

    Publication Year: 1995, Page(s):271 - 279
    Cited by:  Papers (20)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (972 KB)

    The authors propose two automatic threshold-selection schemes, based on functional approximation of the histogram. The first method is based on minimising the sum of square errors, and the second one is based on minimising the variance of the approximated histogram. Experimental results show that, on average, the latter scheme gives better results than the former one, at a small extra computationa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Very low-bit-rate segmentation-based video coding using contour and texture prediction

    Publication Year: 1995, Page(s):253 - 261
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1564 KB)

    The most efficient video coding standard for low bit rates (around 64 kb/s) is the H.261 algorithm recommended by ITU-TS. However, in certain applications such as mobile audiovisual communications and videophone through PSTN, the available transmission bandwidth is very limited. Therefore codecs working at very low bit rates are required. The paper presents a segmentation-based video coding algori... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Detection of curved edges at subpixel accuracy using deformable models

    Publication Year: 1995, Page(s):304 - 312
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1004 KB)

    One approach to the detection of curves at subpixel accuracy involves the reconstruction of such features from subpixel edge data points. A new technique is presented for reconstructing and segmenting curves with subpixel accuracy using deformable models. A curve is represented as a set of interconnected Hermite splines forming a snake generated from the subpixel edge information that minimises th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Curve segmentation and representation by superellipses

    Publication Year: 1995, Page(s):280 - 288
    Cited by:  Papers (13)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1196 KB)

    A method of segmenting curves into series of superelliptical arcs is presented. A superellipse is the 2-dimensional form of the superquadratic and can describe circles, ellipses, crosses, parallelograms and rounded rectangles with the same number of parameters. The superellipses are fitted using Powell's technique to minimise an appropriate error metric. A tree is used to represent a number of int... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Linear adaptive decorrelator for signal separation

    Publication Year: 1995, Page(s):327 - 332
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    Signal separation is a problem often encountered in many practical applications. A novel technique is described that can guarantee signal separation by output decorrelation. In particular, it is shown that a simple transformation of the variables enables the nonlinear set of equations to be solved efficiently using the standard least squares technique. Moreover, the uniqueness of the solution is a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Speaker recognition using hidden Markov models, dynamic time warping and vector quantisation

    Publication Year: 1995, Page(s):313 - 318
    Cited by:  Papers (15)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    The authors evaluate continuous density hidden Markov models (CDHMM), dynamic time warping (DTW) and distortion-based vector quantisation (VQ) for speaker recognition, emphasising the performance of each model structure across incremental amounts of training data. Text-independent (TI) experiments are performed with VQ and CDHMMs, and text-dependent (TD) experiments are performed with DTW, VQ and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stereo calibration from correspondences of OTV projections

    Publication Year: 1995, Page(s):289 - 296
    Cited by:  Papers (3)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (868 KB)

    Stereo images have to be calibrated before stereo vision can recover three-dimensional information of the imaged scene. Position constraints over image point correspondences are traditionally used to solve the calibration problem. A method is described that uses angle constraints over correspondences of a particular type of image features, the projections of orthogonal trihedral vertices (OTV), fo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectrum shaping in N-channel QPSK-OFDM systems

    Publication Year: 1995, Page(s):333 - 338
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    A compact time-domain treatment of a complete spectrum shaped N-channel orthogonal FDM system is presented, enabling practical DSP algorithms for modulation and demodulation to be clearly identified. The resulting DSP architecture is an alternative to previously described OQPSK-OFDM systems and directly provides the two complex samples per symbol required for symbol timing recovery. The paper also... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Novel detection of conics using 2-D Hough planes

    Publication Year: 1995, Page(s):262 - 270
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The authors present a new approach to the use of the Hough transform for the detection of ellipses in a 2-D image. In the proposed algorithm, the conventional 5-D Hough voting space is replaced by four 2-D Hough planes which require only 90 kbytes of memory for a 384×256 image. One of the main differences between the proposed transform and other techniques is the way to extract feature point... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Real-time image processing approach to measure traffic queue parameters

    Publication Year: 1995, Page(s):297 - 303
    Cited by:  Papers (25)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (980 KB)

    The real-time measurement of various traffic parameters including queue parameters is required in many traffic situations such as accident and congestion monitoring and adjusting the timings of the traffic lights. In case of the queue detection, at least two algorithms have been proposed by previous researchers. Those algorithms are used for queue detection and are unable to measure queue paramete... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fast pipelined CORDIC-based adaptive lattice predictor: algorithms and architecture

    Publication Year: 1995, Page(s):339 - 344
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    The authors present a novel CORDIC-based adaptive algorithm and a pipelined architecture for unnormalised lattice prediction filter. Previously, they have presented a CORDIC-based adaptive lattice filtering (CALF) algorithm for normalised lattice filters which features a sign-sign direct (rotation) angle updating scheme (Hu and Liao, 1992). The authors consider a delayed CALF (DeCALF) algorithm in... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.