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2004 Vol. 26, No. 5
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2004, 26(5): 673-678.
Abstract:
During wavelet image processing, the variance of Gaussian white noise is usually estimated in the finest HH subband. A popular method, proposed by Donoho and Johnstone, is often found to provide too large an estimate. To tackle this problem, this pap...
During wavelet image processing, the variance of Gaussian white noise is usually estimated in the finest HH subband. A popular method, proposed by Donoho and Johnstone, is often found to provide too large an estimate. To tackle this problem, this pap...
2004, 26(5): 679-684.
Abstract:
Image registration is an very important technology in multisensor image fusion. There is little correlation among multisensor images, especially images with different bands. It is very difficult to matching these images. Among some images which can b...
Image registration is an very important technology in multisensor image fusion. There is little correlation among multisensor images, especially images with different bands. It is very difficult to matching these images. Among some images which can b...
2004, 26(5): 685-689.
Abstract:
Based on the image halftone technique, a new effective image authentication algorithm is proposed with self repairing ability. First, the original image is quantized by 4 bit based 011 the error diffusion image halftone, and then the result is permut...
Based on the image halftone technique, a new effective image authentication algorithm is proposed with self repairing ability. First, the original image is quantized by 4 bit based 011 the error diffusion image halftone, and then the result is permut...
2004, 26(5): 690-695.
Abstract:
Basic principals of digital quadrature coherent detection are described in this paper via interpolation method. Two implementations are presented, and the signal flow is analysed. The rejection effects to mirror frequencies are discussed and compared...
Basic principals of digital quadrature coherent detection are described in this paper via interpolation method. Two implementations are presented, and the signal flow is analysed. The rejection effects to mirror frequencies are discussed and compared...
2004, 26(5): 696-701.
Abstract:
Detecting singularities of multi-dimensional signals is important and interesting in various fields. The edge of an image and the directions of singularity can be regarded as a wavefront set in the meaning of microlocal analysis, which is intuitively...
Detecting singularities of multi-dimensional signals is important and interesting in various fields. The edge of an image and the directions of singularity can be regarded as a wavefront set in the meaning of microlocal analysis, which is intuitively...
2004, 26(5): 702-708.
Abstract:
A novel blind deconvolution algorithm based on autocorrelation function of band-pass signal is proposed, only single input is required. The input data is transformed to its complex baseband through demodulation and decimation processing. For the base...
A novel blind deconvolution algorithm based on autocorrelation function of band-pass signal is proposed, only single input is required. The input data is transformed to its complex baseband through demodulation and decimation processing. For the base...
2004, 26(5): 709-714.
Abstract:
Time-Frequency parameter estimation and direction finding for nonstationary signals impinging on an antenna array over a wide frequency band (2~18GHz) is under in-vestigation, and a new method for parameter and 2-D Angle-Of-Arrival (AOA) estimation o...
Time-Frequency parameter estimation and direction finding for nonstationary signals impinging on an antenna array over a wide frequency band (2~18GHz) is under in-vestigation, and a new method for parameter and 2-D Angle-Of-Arrival (AOA) estimation o...
2004, 26(5): 715-721.
Abstract:
It is one of the key technologies to MPEG-4 grade codes based on target to segment and track the concerned video objects from the video scene. Most current seg-mentation and tracking algorithms are of high complexity but not effective in getting rid ...
It is one of the key technologies to MPEG-4 grade codes based on target to segment and track the concerned video objects from the video scene. Most current seg-mentation and tracking algorithms are of high complexity but not effective in getting rid ...
2004, 26(5): 722-726.
Abstract:
This paper presents a HMM Local Optimal state Path-based Data Imputation (LOPDI) algorithm. Speech feature vector sequences are presumed to be the outputs of an L state HMM. The HMM state sequence is estimated by local optimal path procedure. Then, m...
This paper presents a HMM Local Optimal state Path-based Data Imputation (LOPDI) algorithm. Speech feature vector sequences are presumed to be the outputs of an L state HMM. The HMM state sequence is estimated by local optimal path procedure. Then, m...
2004, 26(5): 727-732.
Abstract:
For processing the data of squint mode SAR, the modified subaperture approach based on classical real-time subaperture processing is presented in this paper. This new ap-proach can improve the image quality obviously and make the auto-focus processin...
For processing the data of squint mode SAR, the modified subaperture approach based on classical real-time subaperture processing is presented in this paper. This new ap-proach can improve the image quality obviously and make the auto-focus processin...
2004, 26(5): 733-738.
Abstract:
Based on the study on the features and characteristics of random Radio Frequency Interference (RFI) in impulse radar, this paper firstly analyzes the RFI supperession in Ultra Wide Band(UWB) time domain receivers. Taking Mean Square Error (MSE) as pr...
Based on the study on the features and characteristics of random Radio Frequency Interference (RFI) in impulse radar, this paper firstly analyzes the RFI supperession in Ultra Wide Band(UWB) time domain receivers. Taking Mean Square Error (MSE) as pr...
2004, 26(5): 739-745.
Abstract:
A new imaging method is proposed for multi-aperture wide-swath Synthetic Aperture Radar (SAR) in this paper. The imaging algorithm is proved theoretically, and the weighting matrix is proved to be in good condition. The computational complexity of th...
A new imaging method is proposed for multi-aperture wide-swath Synthetic Aperture Radar (SAR) in this paper. The imaging algorithm is proved theoretically, and the weighting matrix is proved to be in good condition. The computational complexity of th...
2004, 26(5): 746-751.
Abstract:
The needed interpolation of keystone transformation used for every subaperture is the bottleneck of imaging for lower frequency Synthetic Aperture Radar(SAR) especially for Ultra Wide Band(UWB) SAR with Planar Sub Aperture Processing(PSAP). A new in-...
The needed interpolation of keystone transformation used for every subaperture is the bottleneck of imaging for lower frequency Synthetic Aperture Radar(SAR) especially for Ultra Wide Band(UWB) SAR with Planar Sub Aperture Processing(PSAP). A new in-...
2004, 26(5): 752-759.
Abstract:
In this paper, an unsupervised Wishart classification scheme for polarimetric interferometric SAR data sets is introduced. A 6x6 polarimetric interferometric coherency matrix is used, in order to take simultaneously into account the full polarimetric...
In this paper, an unsupervised Wishart classification scheme for polarimetric interferometric SAR data sets is introduced. A 6x6 polarimetric interferometric coherency matrix is used, in order to take simultaneously into account the full polarimetric...
2004, 26(5): 760-765.
Abstract:
Ordered Successive Interference Cancellation (OSIC), the conventional detec-tion algorithm for VBLAST, decreases the complexity, comparing with the Maximum Like-lihood (ML), but its performance is much worse than that of ML. In this paper, Partial De...
Ordered Successive Interference Cancellation (OSIC), the conventional detec-tion algorithm for VBLAST, decreases the complexity, comparing with the Maximum Like-lihood (ML), but its performance is much worse than that of ML. In this paper, Partial De...
2004, 26(5): 766-770.
Abstract:
In this paper, the effect of packet duration and channel prediction is analyzed in adaptive modulation. Spectral efficiency equations are derived for both systems with and without channel prediction. Numerical results show that systems with channel p...
In this paper, the effect of packet duration and channel prediction is analyzed in adaptive modulation. Spectral efficiency equations are derived for both systems with and without channel prediction. Numerical results show that systems with channel p...
2004, 26(5): 771-776.
Abstract:
A motion compensated adaptive frame interpolation technique based on mesh model is proposed considering occlusion issue existed in two-dimensional motion estimation. The whole image is divided into three types of regions in order to perform motion es...
A motion compensated adaptive frame interpolation technique based on mesh model is proposed considering occlusion issue existed in two-dimensional motion estimation. The whole image is divided into three types of regions in order to perform motion es...
2004, 26(5): 777-782.
Abstract:
In this paper, a wireless fair scheduling algorithm is proposed using proportional compensation mode. It can distinguish the services in different application levels and use different queueing strategies for each class of services. A compensation str...
In this paper, a wireless fair scheduling algorithm is proposed using proportional compensation mode. It can distinguish the services in different application levels and use different queueing strategies for each class of services. A compensation str...
2004, 26(5): 783-788.
Abstract:
Blind fractionally spaced equalizers can reduce intersymbol interference using only second-order statistics. A blind MMSE equalizer based on linear prediction is presented in this paper. It can directly equalize the channel from the fractionally samp...
Blind fractionally spaced equalizers can reduce intersymbol interference using only second-order statistics. A blind MMSE equalizer based on linear prediction is presented in this paper. It can directly equalize the channel from the fractionally samp...
2004, 26(5): 789-794.
Abstract:
Because of its scalability, the idea of coarse packet classification can be uti-lized to OBS network. However, due to the limited priorities supported by OBS networks, multi-class burst assembly technique is usually adopted. Hence, a novel map algori...
Because of its scalability, the idea of coarse packet classification can be uti-lized to OBS network. However, due to the limited priorities supported by OBS networks, multi-class burst assembly technique is usually adopted. Hence, a novel map algori...
2004, 26(5): 795-799.
Abstract:
Current Internet uses typically drop tail as its buffer management scheme. This scheme does not meet the need of DiffServ model, while RED and its improved algorithms also suffer from shortcoming in term of fairness and relative drop precedence. This...
Current Internet uses typically drop tail as its buffer management scheme. This scheme does not meet the need of DiffServ model, while RED and its improved algorithms also suffer from shortcoming in term of fairness and relative drop precedence. This...
2004, 26(5): 800-806.
Abstract:
A fully differential R-MOSFET-C fourth-order Chebyshev filter employing fully differential operational amplifier, passive resistors and current-steering MOS transistors is proposed, this proposed implementation relies on the tunability of current-ste...
A fully differential R-MOSFET-C fourth-order Chebyshev filter employing fully differential operational amplifier, passive resistors and current-steering MOS transistors is proposed, this proposed implementation relies on the tunability of current-ste...
2004, 26(5): 807-812.
Abstract:
In this paper, by supposing the currents on the two lines are equal but opposite and with the application of bifilar transmission-line theory, the current-voltage relationships of the asymmetrical (current) bifilar even transmission line are obtained...
In this paper, by supposing the currents on the two lines are equal but opposite and with the application of bifilar transmission-line theory, the current-voltage relationships of the asymmetrical (current) bifilar even transmission line are obtained...
2004, 26(5): 813-819.
Abstract:
A broadband output circuit with a workable relative bandwidth bigger than 14% for L-band multiple beam klystron, in which a 7r-mode strong coupling double-gap output cavity is loaded with a coaxial filter, is designed, analyzed and calculated in deta...
A broadband output circuit with a workable relative bandwidth bigger than 14% for L-band multiple beam klystron, in which a 7r-mode strong coupling double-gap output cavity is loaded with a coaxial filter, is designed, analyzed and calculated in deta...
2004, 26(5): 820-824.
Abstract:
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2004, 26(5): 825-829.
Abstract:
EMD (Empirical Mode Decomposition) method is a self-adaptive signal decomposition approach. On the basis of the characteristics of the gear fault vibration signals, EMD is applied to gear fault diagnosis. The result of the application indicates that ...
EMD (Empirical Mode Decomposition) method is a self-adaptive signal decomposition approach. On the basis of the characteristics of the gear fault vibration signals, EMD is applied to gear fault diagnosis. The result of the application indicates that ...
2004, 26(5): 830-834.
Abstract:
OGY method(1990) is applied to control the chaos exhibited by current-mode controlled boost dc-dc converter, as its chaotic regime has been established in this paper. This is achieved by using discrete-time model and making simplification of the cont...
OGY method(1990) is applied to control the chaos exhibited by current-mode controlled boost dc-dc converter, as its chaotic regime has been established in this paper. This is achieved by using discrete-time model and making simplification of the cont...
2004, 26(5): 835-840.
Abstract:
The simulation calculation with the computer using FORTRAN language for frequency characteristics of the microwave duplexer tube (TR tube) is described in this pa-per. It is based on the theory of microwave four terminal networks with lumped paramete...
The simulation calculation with the computer using FORTRAN language for frequency characteristics of the microwave duplexer tube (TR tube) is described in this pa-per. It is based on the theory of microwave four terminal networks with lumped paramete...
