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Variable regularisation parameter sign subband adaptive filter

ELECTRONICS LETTERS 2010年第24期46卷 1605-1606页

作者： Ni, J. Li, F. Fudan Univ Dept Elect Engn Shanghai 200433 Peoples R China

A sign subband adaptive filter (SSAF) for acoustic echo cancellation is proposed, which is derived by minimising the L(1)-norm of the subband a posteriori error vector subject to a constraint on the tap-weight vector of the filter. In addition, a variable regularisation parameter (VRP) is introduced to improve the performance of the SSAF. Simulation results are presented to verify the good robustness of the proposed VRP-SSAF against double-talk.

关键词： variable regularisation parameter sign subband adaptive filter a posteriori error vector filtering methods in signal processing Electromagnetic compatibility and interference echo adaptive filters acoustic echo cancellation echo suppression SSAF

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Design of microstrip lowpass filters with wide stopband and high attenuation

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ELECTRONICS LETTERS 2010年第21期46卷 1445-1446页

作者： Tang, C. -W. Chen, M. -G. Natl Chung Cheng Univ Dept Commun Engn Chiayi Taiwan Natl Chung Cheng Univ Dept Elect Engn Chiayi Taiwan

In this reported work, novel microstrip lowpass filters featuring wide stopband and high attenuation have been developed. These filters are composed of multiple open stubs and short-end coupled lines. By properly selecting the electrical lengths of the open stubs and short-end coupled lines, transmission zeros can be generated in the vicinity of harmonics and a wide stopband can be obtained. Detailed design procedures are provided;moreover, agreement between measured and theoretically predicted results demonstrates the feasibility of the proposed filter.

关键词： short-end coupled lines high attenuation filtering methods in signal processing microstrip low-pass filters wide stopband microstrip filters low-pass filters multiple open stubs

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Eye detection using eye filter and minimisation of NMF-based reconstruction error in facial image

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ELECTRONICS LETTERS 2010年第2期46卷 130-131页

作者： Park, C. W. Park, K. T. Moon, Y. S. Hanyang Univ Comp Vis & Pattern Recognit Lab Dept Comp Sci & Engn Seoul South Korea Hanyang Univ Ambient Intelligence Software Team Inst Hanyang BK21 Seoul South Korea

A novel approach for eye detection is proposed, where an eye filter considering textural characteristics of eye regions and non-negative matrix factorisation (NMF)-based image reconstruction is utilised. The eye filter for detecting pairs of eye candidate points is utilised. To detect the exact eye position, all pairs of the eye candidates are evaluated by a cost function, which minimises the NMF-based image reconstruction error. Experimental results have shown that the proposed method achieves better performance of eye detection than existing methods under various environments such as head pose, facial expression and illumination conditions.

关键词： image reconstruction error minimisation textural characteristics eye position eye detection Algebra face recognition eye filtering theory facial expression computer vision head pose image texture illumination condition facial image matrix decomposition nonnegative matrix factorisation Computer vision and image processing techniques image reconstruction eye region eye candidate points filtering methods in signal processing eye filter object detection Image recognition

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Universal log-domain biquad

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ELECTRONICS LETTERS 2010年第7期46卷 487-488页

作者： Fragoulis, N. Univ Patras Dept Phys Elect Lab Patras 26500 Greece

A universal log-domain biquad is presented, which is able to deliver all types of frequency transfer functions such as lowpass, highpass, band-stop, bandpass, allpass, notch. The block is completely built from E-cells... 详细信息

关键词： frequency transfer function filtering theory transfer functions E-cells filtering methods in signal processing universal log-domain biquad signal processing theory

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DSP-PML algorithm for open region DNG meta-material FDTD simulations

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ELECTRONICS LETTERS 2010年第1期46卷 16-17页

作者： Ramadan, O. Eastern Mediterranean Univ Dept Comp Engn TR-10 Gazi Magusa Mersin Turkey

The digital signal processing (DSP) algorithms developed for digital filters and the perfectly matched layer (PML) formulations are incorporated with the finite difference time domain (FDTD) method to model open region double-negative (DNG) meta-material electromagnetic problems. In the proposed approach, the dielectric parameters of each FDTD unit cell are interpreted as an infinite impulse response digital filter which can be implemented efficiently using the transpose direct form II. A numerical example carried out in a two-dimensional domain is included to show the validity of the proposed formulation.

关键词： open region DNG metamaterial FDTD simulations Other numerical methods infinite impulse response digital filter filtering methods in signal processing finite difference time-domain analysis IIR filters digital signal processing algorithms open region metamaterial electromagnetic problem metamaterials perfectly matched layer Digital signal processing Digital filters two-dimensional domain signal processing double-negative metamaterial electromagnetic problem dielectric parameters finite difference time domain method

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Wavefront curvature correction in one stationary bistatic SAR image focused via PFA

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ELECTRONICS LETTERS 2010年第18期46卷 1291-U77页

作者： Wang, X. Zhu, D. Nanjing Univ Aeronaut & Astronaut Coll Informat Sci & Technol Nanjing 210016 Peoples R China

The wavefront curvature error in one stationary bistatic synthetic aperture radar (SAR) image focused via the polar format algorithm (PFA) is analysed and a space-variant filtering method for wavefront curvature correction is proposed. The correction method presented, extends the focused scene size when using the bistatic PFA effectively. Point target simulation validates the filtering method.

关键词： Optical, image and video signal processing stationary bistatic SAR image space-variant filtering method filtering methods in signal processing radar imaging polar format algorithm wavefront curvature correction Radar equipment, systems and applications point target simulation synthetic aperture radar PFA

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Optimal integer FIR filtering for colour interpolation

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ELECTRONICS LETTERS 2010年第20期46卷 1376-1377页

作者： Su, C. -Y. Chang, M. -K. Hong, C. -M. Normal Univ Taipei 10612 Taiwan

Presented is a new and optimal integer finite impulse response ( FIR) filtering for interpolating the colour images sampled with the Bayer colour filter array. The new filtering, compared with the conventional one, re... 详细信息

关键词： Optical, image and video signal processing interpolation colour images interpolation image colour analysis filtering methods in signal processing FIR filters optimal integer finite impulse response filtering Interpolation and function approximation (numerical analysis) Bayer colour filter array Computer vision and image processing techniques

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Comment on 'Huber-based unscented filtering and its application to vision-based relative navigation'

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IET RADAR SONAR AND NAVIGATION 2010年第5期4卷 744-745页

作者： Karlgaard, C. D. Schaub, H. Analyt Mech Associates Inc Hampton VA USA Univ Colorado Dept Aerosp Engn Sci Boulder CO 80309 USA

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NLM algorithm with weight update

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ELECTRONICS LETTERS 2010年第15期46卷 1061-1062页

作者： Park, S. W. Kang, M. G. Yonsei Univ Inst TMS Informat Technol Seoul 120749 South Korea

The nonlocal means (NLM) filter is one of the most popular denoising approaches and there have been many improvements regarding its weight function and parameter optimisation. However, those improvements have not removed artifacts such as the false texture pattern, which occurs when the smoothing parameter in the weight function is small. The smoothness in the flat region and the sharpness in the texture region without the artifacts can be ensured by accurately estimated weights, which can be calculated with sufficient similar patches. In this reported work, a NLM algorithm with weight update is used to exploit the weights from relatively similar locations as well as the weights from the centre location. Experimental results demonstrate that the proposed method performed well.

关键词： nonlocal mean filter Optical, image and video signal processing NLM algorithm filtering theory filtering methods in signal processing weight function false texture pattern image denoising approach parameter optimisation image denoising Computer vision and image processing techniques

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Comment on 'Huber-based unscented filtering and its application to vision-based relative navigation' Reply

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IET RADAR SONAR AND NAVIGATION 2010年第5期4卷 746-746页

作者： Wang, X. Harbin Inst Technol Harbin 150006 Peoples R China

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