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检索条件"任意字段=Conference on Wavelets - Applications in Signal and Image Processing IX"

共 646 条记录，以下是181-190 订阅

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2007 IEEE International conference on image processing - ICIP 2007 Proceedings

2007 IEEE International Conference on Image Processing - ICI...

引用

14th IEEE International conference on image processing, ICIP 2007

ISBN: (纸本)1424414377

The proceedings contain 841 papers. The topics discussed include: scalable coding of high dynamic range video;bit-depth scalable video coding;the super hi-vision codec;inverse bit plane decoding order for turbo code based distributed video coding;encoder rate control for transform domain Wyner-Ziv video coding;image authentication based on distributed source coding;codec-independent scalable distributed video coding;a novel image re-indexing by self organizing motor maps;multichannel image decomposition by using pseudo-linear Haar wavelets;a feature analysis approach to mass detection in mammography based on RF-SVM;time reversal beamforming for microwave breast cancer detection;automatic quality analysis for film and video restoration;unscented kalman filter for image estimation in film-grain noise;detection and recovery of film dirt for archive restoration applications;and restoration of variable area soundtracks.

关键词： Video signal processing

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2007 IEEE International conference on image processing - ICIP 2007 Proceedings

2007 IEEE International Conference on Image Processing - ICI...

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14th IEEE International conference on image processing, ICIP 2007

ISBN: (纸本)1424414377

关键词： Video signal processing

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2007 IEEE International conference on image processing, ICIP 2007 Proceedings

2007 IEEE International Conference on Image Processing, ICIP...

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14th IEEE International conference on image processing, ICIP 2007

ISBN: (纸本)1424414377

关键词： Video signal processing

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2007 IEEE International conference on image processing - ICIP 2007 Proceedings

2007 IEEE International Conference on Image Processing - ICI...

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14th IEEE International conference on image processing, ICIP 2007

ISBN: (纸本)1424414377

关键词： Video signal processing

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2007 IEEE International conference On image processing - ICIP 2007 Proceedings

2007 IEEE International Conference On Image Processing - ICI...

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14th IEEE International conference on image processing, ICIP 2007

ISBN: (纸本)1424414377

关键词： Video signal processing

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Use of minimal inter-quantile distance estimation in image processing

Use of minimal inter-quantile distance estimation in image p...

引用

conference on Mathematics of Data/image Pattern Recognition, Compression and Encryption with Application ix

作者： Lukin, Vladimir V. Abramov, Sergey K. Zelensky, Alexander A. Astola, Jaakko T. Natl Aerosp Univ UA-61070 Kharkov Ukraine Tampere Univ Technol Inst Signal Proc FIN-33101 Tampere Finland

ISBN: (纸本)0819463949

Nowadays multichannel (multi and hyperspectral) remote sensing (RS) is widely used in different areas. One of the basic factors that can deteriorate original image quality and prevent retrieval of useful information from RS data is noise. Thus, image filtering is a typical stage of multichannel image pre-processing. Among known filters, the most efficient ones commonly require a priori information concerning noise type and its statistical characteristics. This explains a great need in automatic (blind) methods for determination of noise type and its characteristics. Several such methods already exist, but majority of them do not perform appropriately well if analyzed images contain a large percentage of texture regions, details and edges. Besides, many blind methods are multistage where some preliminary and appropriately accurate estimate of noise variance is required for next stages. To get around aforementioned shortcomings, below we propose a new method based on using inter-quantile distance and its minimization for obtaining appropriately accurate estimates of noise variance. It is shown that mathematically this task can be formulated as finding a mode of contaminated asymmetric distribution. And this task can be met for other applications. The efficiency of the proposed method is studied for a wide set of model distribution parameters. Numerical simulation results that confirm applicability of the proposed approach are presented. They also allow evaluating the designed method accuracy. Recommendations on method parameter selection are given.

关键词： inter-quantile distance image analysis and processing

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Dilation matrices for nonseparable bidimensional wavelets

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8th International conference on Advanced Concepts for Intelligent Vision Systems

作者： Ruedin, Ana Univ Buenos Aires Fac Ciencias Exactas & Nat Dept Computac RA-1428 Buenos Aires DF Argentina

ISBN: (纸本)3540446303

For nonseparable bidimensional wavelet transforms, the choice of the dilation matrix is all-important, since it governs the downsampling and upsampling steps, determines the cosets that give the positions of the filters, and defines the elementary set that gives a tesselation of the plane. We introduce nonseparable bidimensional wavelets, and give formulae for the analysis and synthesis of images. We analyze several dilation matrices, and show how the wavelet transform operates visually. We also show some distorsions produced by some of these matrices. We show that the requirement of their eigenvalues being greater than 1 in absolute value is not enough to guarantee their suitability for image processing applications, and discuss other conditions.

关键词： quincunx nonseparable dilation wavelet

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Wavelet-based multiscale level-set curve evolution in noise reduction for MR Imaging

Wavelet-based multiscale level-set curve evolution in noise ...

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Medical Imaging 2006 conference

作者： Zhong, Junmei Dardzinski, Bernard Wansapura, Janaka Cincinnati Childrens Hosp Med Ctr Imaging Res Ctr 3333 Burnet AveML5031 Cincinnati OH 45229 USA

ISBN: (纸本)0819464236

In magnetic resonance (MR) imaging, there is a tradeoff between the spatial resolution, temporal resolution and signal to noise ratio (SNR). MR images usually suffer from low SNR and low resolutions. In order to make it practical for MR imaging with higher resolutions as well as sufficient SNR, it is necessary to reduce noise efficiently while preserving important image features. In this paper, we propose to use the wavelet-based multiscale level-set curve evolution algorithm to reduce noise for MR imaging. Experimental results demonstrate that this denoising algorithm can significantly improve the SNR and contrast to noise ratio (CNR) for MR images while preserving edges with good visual quality. The denoising results indicate that in MR imaging applications, we can almost doubly improve the temporal resolution or improve the spatial resolution while achieving sufficient SNR, CNR, and satisfactory image quality.

关键词： Denoising signal to noise ratio Magnetic resonance imaging Spatial resolution image resolution Wavelet transforms Temporal resolution image quality image acquisition wavelets

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Noise reduction from magnetic resonance images using nonseperable transforms - art. no. 61446F

Noise reduction from magnetic resonance images using nonsepe...

引用

Medical Imaging 2006 conference

作者： Nezhadarya, Ehsan Shamsollahi, Mohammad Bagher Sharif Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)0819464236

Multi-scale transforms have got a lot of applications in image processing, in recent years. Wavelet transform is a powerful multiscale transform for denoising noisy signals and images, but the usual two-dimensional separable wavelets are sub-optimal. These separable wavelet transforms can successfully identify zero dimensional singularities in images, but can weakly identify one dimensional singularities such as edges, curves and lines. In this sense, non-separable transforms such as Ridgelet and Curvelet transforms are proposed by Candes and Donoho. The coefficients produced by these non-separable transforms have shown to be sparser than wavelet coefficients. This fact results in better denoising capabilities than wavelet transform. These new non-separable transforms can identify direction in lines and curves, because of special structure of their basis elements. Basically, Magnetic Resonance images are probable to have Rician noise. In some special cases, this kind of noise can be supposed to be white Gaussian noise. In this paper, a new method for denoising MR images is proposed. This method is based on Monoscale Ridgelet transform. It is shown that this transform can successfully denoise MR images embedded in white Gaussian noise. The results are better in comparison with usual wavelet denoising methods, based on both visual perception and signal-to-noise ratio.

关键词： image denoising multiresolution and wavelets magnetic resonance Imaging ridgelet transform

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Experimental evidence of spatial coherence moirè

Experimental evidence of spatial coherence moirè

引用

Coherent Optical Technologies and applications, COTA 2006

作者： Castaneda, Roman Herrera, Jorge A. Usuga-Castañeda, Mario A. Physics School Universidad Nacional de Colombia Sede Medellín A. A. 3840 Medellín Colombia

We present the experimental evidence of spatial coherence moiré, produced by the superposition of uncorrelated spatial coherence wavelets. We show that it can be modulated using a procedure called filtering of cl... 详细信息

ISBN: (纸本)1557528098

关键词： Coherence Fourier transforms image processing Laser beams Optical fields Power spectra Coherence and statistical optics (030.0030) Coherent optical effects (030.1670) Fourier optics and signal processing (070.0070) Spectrum analysis (070.4790)

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