2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)
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Các bài báo tiêu biểu
Improving the speed and performance of adaptive equalizers via transform based adaptive filtering
Tập 2 - Trang 1301-1304 vol.2
Adaptive equalizers are widely used in many communication systems where the channel frequency response characteristics are either time varying or unknown such as the case in wireless and dial up telecommunication networks where the communication channel constantly change due to the different packet routes and switching that takes place, as well as due to the changes in the RF propagation. This wor......
#Adaptive equalizers #Adaptive filters #Discrete Fourier transforms #Discrete wavelet transforms #Fourier transforms #Discrete cosine transforms #Eigenvalues and eigenfunctions #Frequency response #Time varying systems #Communication channels
Recursive non parametric spectral estimation from irregularly sampled observations
Tập 2 - Trang 799-802 vol.2
In this paper, the nonparametric spectral analysis of a randomly sampled signal is discussed. In particular, a class of estimators is introduced: the IRINCORREL class. This class is composed of recursive algorithms which both take into account the sampling irregularity and the correlation of the signal values. The study of the mean square estimation error shows that there is a trade off between bi......
#Recursive estimation #Sampling methods #Spectral analysis #Signal processing algorithms #Frequency #Random variables #Large Hadron Collider #Estimation error #Convergence #Signal processing
Video coding by using the 3D zero-tree approach in the wavelet transform domain
Tập 2 - Trang 683-687 vol.2
We propose a video coding scheme based on the application of the wavelet transform, both in time and in space domain, using the lifting scheme to calculate the coefficients. The coefficients of the resulting 3D tree hierarchic structure are coded through the EZW 3D, followed by Huffman coding. The bit rate is scalable by adaptive thresholding. The structure of the codec and some experimental resul......
#Video coding #Wavelet domain #Wavelet transforms #Discrete wavelet transforms #Multiresolution analysis #Filter bank #Codecs #Discrete cosine transforms #Finite impulse response filter #Frequency
The application of symplectic geometry on nonlinear dynamics analysis of the experimental data
Tập 2 - Trang 1137-1140 vol.2
For nonlinear dynamic analysis of the experiment data, one often uses SVD decomposition to reconstruct embedding dimension of attractor because of its simpleness. However, it is hardly for singular value decomposition (SVD) decomposition to get good results in the attractor reconstruction of the experiment data. For this, symplectic geometry method is proposed to estimate embedding dimension of re......
#Geometry #Nonlinear dynamical systems #Delay effects #Electromyography #Surface reconstruction #Chaos #State-space methods #Time series analysis #Data analysis #Mechatronics
Directly estimated multiuser detectors for code-division multiple-access signals and their adaptive implementation
Tập 2 - Trang 631-634 vol.2
This paper presents adaptive multiuser CDMA detection techniques for wireless communication systems. Directly estimated adaptive (DEA) detectors are developed by formulating multiuser CDMA detection as an inverse problem in the presence of channel-induced interference and noise. The estimation of the detector parameters is accomplished using elements of regularization theory. The regularized solut......
#Adaptive signal detection #Detectors #Multiaccess communication #Pulse modulation #Base stations #Wireless communication #Interference #Adaptive algorithm #Degradation #Binary phase shift keying
Image retrieval using a fractal signature extraction technique
Tập 2 - Trang 1215-1218 vol.2
Content-based image retrieval has become a reliable tool for digital image applications. There are several advantages of the image retrieval techniques compared to other simple retrieval approaches such as text-based retrieval techniques. This paper proposes a new method for color image retrieval, suitable for color image databases. It is based on a fractal scanning technique, which is used to ext......
#Image retrieval #Fractals #Colored noise #Color #Content based retrieval #Digital images #Information retrieval #Image databases #Spatial databases #Feature extraction
An analysis of sub-pixel estimation error on area-based image matching
Tập 2 - Trang 1239-1242 vol.2
Area-based matching and sub-pixel displacement estimation using similarity measures are common methods for various fields. Sub-pixel estimation using parabola fitting over three points with their similarity measures is also a common method to increase the resolution of matching. However, this estimation contains a systematic error depending on the image characteristics, the similarity function, an......
#Image analysis #Estimation error #Image matching #Area measurement #Pattern analysis #Digital signal processing #Fitting #Information science #Displacement measurement #Motion estimation
Object-based segmentation of moving sequences using multiple features
Tập 2 - Trang 547-550 vol.2
In this paper a novel two-stage architecture for object-based segmentation of moving sequences is proposed using multiple features such as motion, intensity and texture. The first stage locates perceptually meaningful objects using a hierarchy of single-feature segmentation processes. The second stage refines the boundaries of located objects using a suitable combination of features and a set of a......
#Image segmentation #Layout #Data mining #Speech processing #Signal processing #MPEG 4 Standard #MPEG 7 Standard #Shape #Object segmentation #Computational complexity
Robust non-linear filtering for video processing
Tập 2 - Trang 571-574 vol.2
Noise removal techniques, such as the K-nearest neighbour filter and the /spl alpha/-trimmed mean filter, are known to be very robust in still image noise removal, but they have not been exploited in video processing. We investigate their 3D-extension for use in video sequence noise removal. We also determine the optimal balance between temporal and spatial window size, the optimal values of the o......
#Nonlinear filters #Gaussian noise #Noise robustness #Image processing #Pixel #Information filtering #Information filters #Video sequences #PSNR #Sorting
A hybrid approach for solving the cluster validity problem
Tập 2 - Trang 1207-1210 vol.2
A hybrid approach for solving the cluster validity problem is proposed. The proposed technique uses a cluster validity index in conjunction with a merging index to find the optimal number of clusters in a set of data. The technique does not place any restriction on the fuzzy clustering technique and the cluster validity index used. This paper examines the use of fuzzy c-means clustering and the va......
#Merging #Fuzzy systems #Clustering algorithms #Partitioning algorithms #Information technology #Australia #Telecommunications #Telematics #Image processing #Clustering methods