By Topic

Signal Processing, 2002 6th International Conference on

Date 26-30 Aug. 2002

Go

Filter Results

Displaying Results 1 - 25 of 228
  • 2002 6th International Conference on Signal Processing Proceedings [front matter]

    Publication Year: 2002, Page(s):0_1 - xxiv
    Request permission for commercial reuse | PDF file iconPDF (1033 KB)
    Freely Available from IEEE
  • Research on cooperation and learning in multi-agent system

    Publication Year: 2002, Page(s):1159 - 1162 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (229 KB) | HTML iconHTML

    Cooperation and learning in multi-agent systems (MAS) is of special interest in DAI. This paper presents a cooperation model called MACM that provides a flexible coordination mechanism to support cooperation and learning in MAS. The learning agent adopts model-free distributed Q-learning. By using projection method, the distributed Q-learning algorithm needs less storage space for the Q-table than... View full abstract»

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

    Publication Year: 2002, Page(s):1855 - 1865
    Request permission for commercial reuse | PDF file iconPDF (284 KB)
    Freely Available from IEEE
  • Doppler compensation for passive coherent location

    Publication Year: 2002, Page(s):1457 - 1460 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB) | HTML iconHTML

    For target movement without velocity information in a passive coherent location system, the unknown Doppler shift between the direct signal and the target echo results in a decrease of the highest peak output value and the occurrence of some false peaks. Several Doppler compensation methods are compared in terms of the Doppler decorrelation loss factor. The Doppler decorrelation loss from the diff... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Communication capacity of sectored CDMA systems

    Publication Year: 2002, Page(s):1286 - 1290 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (346 KB) | HTML iconHTML

    This paper shows that the communication capacity of CDMA systems can be enlarged further, by adopting array antennas, which involves a joint multiuser detection approach that is based on CDMA codes and their spatial information. In contrast to SDMA-CDMA systems the CDMA systems with array antennas in this paper do not have spatial coding, since it causes the frequent spatial handoff problem. Thus ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An S-transform based neural pattern classifier for non-stationary signals

    Publication Year: 2002, Page(s):1047 - 1050 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB) | HTML iconHTML

    The paper presents a new approach for the classification of non-stationary signal patterns in an electric power network using a modified wavelet transform and neural network. The wavelet transform is phase corrected to yield a new transform known as the S-transform, which has an excellent time-frequency resolution characteristic. The phase correction absolutely references the phase of the wavelet ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Phase coded continuous wave radar echoes analysis and recognition based on chaotic dynamics

    Publication Year: 2002, Page(s):1453 - 1456 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB) | HTML iconHTML

    A detailed analysis is presented on the chaotic dynamics of moving target echoes produced by phase coded continuous wave (PCCW) radar. Based on real sampled data, the chaotic dynamics of different kinds of target are proved by three principal chaotic invariants, namely, correlation dimension, Lyapunov spectrum, and Kolmogorov entropy. The feasibility of target recognition based on these extracted ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new method for obstacle detection in ITS

    Publication Year: 2002, Page(s):1770 - 1773 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB) | HTML iconHTML

    In a 2D road image, vertical edges of a vehicle still keep vertical and do not converge, therefore obstacle detection can be performed in the 2D image plane. With the help of the detected lane structure, two obstacle detection schemes are given. One uses edge detection and binary rank order filtering (BROF) techniques for the cases of normal luminance, the other utilizes weighted mean filter and r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of order statistic clutter map CFAR

    Publication Year: 2002, Page(s):1572 - 1575 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB) | HTML iconHTML

    Cell average clutter map CFAR (CACM-CFAR) is analyzed at first. CACM-CFAR has better performance in the inhomogeneous clutter environment, but is affected by interference and self-masking which will cause the low probability of detection. To solve these problems, a novel algorithm named order statistic clutter map CFAR (OSCM-CFAR) is proposed, in which the clutter map is updated by the k-th ranked... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inverse QR iterative algorithm for space-time adaptive processing

    Publication Year: 2002, Page(s):1429 - 1432 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (299 KB) | HTML iconHTML

    An inverse QR iterative algorithm is derived for calculating practical adaptive weights based on the space-time multiple-beam (STMB) approach. It is suitable for improving the detection performance of the STMB approach in all interesting ranges. Simulation results indicate that the inverse QR iterative algorithm can improve the performance of the STMB approach in all ranges for nonhomogeneous clut... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nonlinear distortion analysis of RF power amplifiers for wireless signals

    Publication Year: 2002, Page(s):1282 - 1285 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (333 KB) | HTML iconHTML

    One of the critical and costly components in digital cellular communication systems is the RF power amplifier. Theoretically, one of the main concerns in an RF power amplifier design is the nonlinear effect of the amplifier. Quantitatively, no explicit relationship or expression currently exists between the out-of-band emission level and the nonlinearity description related to the third-order inte... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Terrain matching based on imaging laser radar

    Publication Year: 2002, Page(s):1043 - 1046 vol.2
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    A terrain aided navigation using a range image from imaging laser radar is presented. A real-time terrain elevation map is generated from the range image. Because of undulating terrain, the recovered terrain elevation map is non-uniform. It needs to be resampled. Ridge lines are extracted as basic 3D terrain features. The Hausdorff distance between planar sets of points is known to be a good metho... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Detection of hovering helicopter

    Publication Year: 2002, Page(s):1449 - 1452 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB) | HTML iconHTML

    Hovering helicopter detection is an important and difficult task. After analyzing references and experimental data, the paper presents a joint method of detection in the time-domain and identification in the frequency-domain for detecting a hovering helicopter, and then it is tested with experimental data. The result shows that the method is effective. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Speech retrieval for TV news programs by fusing the audio and video information

    Publication Year: 2002, Page(s):994 - 997 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB) | HTML iconHTML

    A typical news story contains a brief report by the anchor person(s) in the studio, as well as news footage in the field. Investigation shows that our recognizer performs better when indexing audio from the studio than that from the field. In order to automatically extract the "reliable" audio segments for speech retrieval, we attempt to detect studio-to-field transitions by means of video parsing... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An electrical capacitance tomography

    Publication Year: 2002, Page(s):1766 - 1769 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (249 KB) | HTML iconHTML

    This paper reports on a study determining the capacitance from given permittivity patterns and describes the image reconstruction method for electrical capacitance tomography (ECT). The model described in this paper is a square object with 8 electrodes. The finite difference method and Gauss's law are used for calculating numerically the capacitance of the system. Linear backprojection is then uti... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A DWT-based color image steganography scheme

    Publication Year: 2002, Page(s):1568 - 1571 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB) | HTML iconHTML

    A novel text cryptosystem is proposed. The secret information is hidden into a publicly accessed color image by a quantization-based strategy, so the transportation of the secret information will not attract the attention of illegal eavesdropper. With our approach, the secret information is embedded in the wavelet domain of every chrominance component, so the hiding capacity is larger than the sim... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new model of synthetic integration for meteorological forecast based on neural networks and fuzzy logic

    Publication Year: 2002, Page(s):1827 - 1830 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    Combination methods of neural networks and fuzzy logic are briefly surveyed. Then, a novel combination model is presented for synthetic integration of rainfall. The presented model is composed of four network layers: input layer, membership function construction layer, inference layer and defuzzification layer. The combination model is applied to synthetic integration of forecasted rainfall data p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Image segmentation using modified extended fuzzy rules

    Publication Year: 2002, Page(s):941 - 944 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (410 KB) | HTML iconHTML

    The extended fuzzy rules for image segmentation (EFRIS) algorithm initially splits all segmented regions into mutually exclusive 4-connected objects, from which the largest one in each region is designated as its main object. A drawback of this approach is that it is less effective when the main objects are relatively small and some of the other objects are completely surrounded and connected to t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive time-varying filter for linear FM signal in fractional Fourier domain

    Publication Year: 2002, Page(s):1425 - 1428 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    The aim of the paper is to propose an adaptive method for filtering the linear FM signal embedded in white Gaussian noise. The proposed approach is based on the idea that the fractional Fourier transform for a signal is equivalent to rotating the signal on the time-frequency plane. The performance of the method is evaluated in terms of computational complexity and SNR improvement factor. Some theo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved weighting vector selection method in maximum ratio transmission over flat Rayleigh fading channels

    Publication Year: 2002, Page(s):1279 - 1281 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB) | HTML iconHTML

    We investigate the principle of maximum ratio transmission (MRT) for flat Rayleigh fading channels. Theoretical analysis indicates that the overall signal to noise ratio gain of MRT by using the multiple antennas for both transmission and reception can be maximized by selecting the weighting vector properly. It can be considered as an expansion of that presented by Lo (IEEE Trans. Comm. vol.47, no... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Quadratic boundaries in N-N classifiers with dissimilarity-based representations

    Publication Year: 2002, Page(s):1039 - 1042 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (331 KB) | HTML iconHTML

    The performance of the nearest neighbor (N-N) classifiers with the dissimilarity-based representations is studied. The dissimilarity-based representations cause quadratic decision boundaries instead of usual piecewise linear boundaries. The correct classification ratio of the N-N classifiers is improved with the use of the dissimilarity-based representations when variations within class differ fro... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Video watermarking combining with hybrid coding scheme

    Publication Year: 2002, Page(s):1588 - 1591 vol.2
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB) | HTML iconHTML

    A watermarking scheme combining with hybrid video coding is proposed in this paper. The intra-coded frame, which is called intra-frame, is blocked and discrete cosine transformed (DCT), watermark is embedded in the low-frequency coefficients in DCT domain. While for the inter-coded frame, the blocked motion compensation is discrete cosine transformed as in I frame, then the DC coefficient in the D... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On motion compensation for weak radar reflected signal detection

    Publication Year: 2002, Page(s):1445 - 1448 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB) | HTML iconHTML

    Detection of a weak radar reflected signal is to enhance the target echo against background noise or clutter using a long-term integration technique. During the integration duration, the target echo may migrate from one cell to another across the radar's resolution cells, e.g., range cell migration and Doppler cell migration; thus motion compensation must be considered to achieve better detection ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wireless video communication on embedded system

    Publication Year: 2002, Page(s):1377 - 1380 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    In this paper, a PDA-based wireless communication system adopting MPEG-4 video compression techniques is introduced. The key implementation and optimization issues are described such as multithreading, buffer design, wireless communication, encoder and decoder. The results indicate that the system proposed and developed has successfully reached the aim of real-time video coding and communication t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A dynamic denoising natural image compression

    Publication Year: 2002, Page(s):1179 - 1182 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB) | HTML iconHTML

    This paper provides a new compression of natural images, which transforms image data by independent component analysis (ICA), estimates every component based on the sparseness properties related to simple-cell receptive fields closely and compresses the transformed data making use of runlength coding. This method can not only compress natural images efficiently, but also remove the noise of the im... View full abstract»

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