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2012 11th International Conference on Information Science, Signal Processing and their Applications (ISSPA)最新文献

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Explicit duration modelling in HMM-based speech synthesis using continuous hidden Markov Model 基于连续隐马尔可夫模型的hmm语音合成中的显式持续时间建模
K. Ogbureke, João P. Cabral, Julie Carson-Berndsen
This paper presents a novel approach to explicit duration modelling for HMM-based speech synthesis. The proposed approach is a two-step process. The first step in this process is state level phone alignment and conversion of phone durations into the number of frames. In the second step, a hidden Markov model (HMM) is trained whereby the observation is the number of frames in each state and the hidden state the phone. Finally, the duration of each state (the number of frames) is generated from the trained HMM. Hidden semi-Markov model (HSMM) is the baseline for explicit duration modelling in HMM-based speech synthesis. Both objective and perceptual evaluation on a held-out test set showed comparable results with a baseline HSMM-based speech synthesis. This duration modelling approach is computationally simpler than HSMM and produces comparable results in terms of the quality of synthetic speech.
本文提出了一种新的基于hmm的语音合成显式持续时间建模方法。提议的方法分为两步。这个过程的第一步是状态级电话对齐,并将电话持续时间转换为帧数。在第二步中,训练隐马尔可夫模型(HMM),其中观察值是每个状态下的帧数和手机的隐藏状态。最后,从训练好的HMM生成每个状态的持续时间(帧数)。隐半马尔可夫模型(HSMM)是基于隐半马尔可夫模型的语音合成中显式持续时间建模的基础。在测试集上的客观和感知评价与基于基线hsmm的语音合成结果相当。这种持续时间建模方法在计算上比HSMM简单,并且在合成语音质量方面产生可比较的结果。
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引用次数: 5
Application of multipoint auscultation for heart sound diagnostic system (MAHDS) 多点听诊在心音诊断系统中的应用
Hadrina Sh-Hussain, S. Salleh, A. K. Ariff, Osama Alhamdani, T. T. Swee, A. M. Noor, H. Oemar, Khalid Yusoff
Humans are different in many ways: fat or thin, young or old, sick or healthy; they may differ in auscultation sites which may vary according to the patient's anatomy. Emphasis must be placed on the characteristics of heart sound based on its intensity which greatly depends on the location of the stethoscope to its pericardium. Each one of these areas will emphasize certain characteristics components of the heart sound. Grouping of the first heart sound (lub) is called the S1 features while the second heart sound (dub) is called the S2 features, the systolic or diastolic features are important factor to determine the types of murmurs. To this end, studies have been limited to reflect on the development and evaluation methods in order to detect the various components constituting signal of the heart sound at one specific auscultation point. The principle area of interest in this paper is, however placing the stethoscope at the semi lunar valve called aortic as position one and pulmonary as position two which will provide better quality of the S2 sound. The S1 heart sound can be heard more clearly in the atroventricle (AV) where the mitral valve as position three and tricuspid valve as position four. Comparative experiments with respect to MFCC feature, different number of HMM states and different number of gaussian mixtures were investigated to measure the influence of these factors on the classification performance at the four locations of auscultation of the heart sound. Interestingly, a five-state model outperformed the four-state model which was supposed to model the four basic components of the heart sounds. It can be said, a five-state average over all Gaussian mixtures model and at the four locations provide the best overall performance of 90.1% accuracy.
人类在很多方面都是不同的:胖或瘦,年轻或年老,生病或健康;听诊部位可能因患者的解剖结构而异。重点必须放在基于其强度的心音特征上,这在很大程度上取决于听诊器对心包的位置。这些区域中的每一个都会强调心音的某些特征组成部分。第一心音(lub)组称为S1特征,第二心音(dub)组称为S2特征,其中收缩期或舒张期特征是确定杂音类型的重要因素。为此,研究仅限于反思在某一听诊点检测构成心音信号的各种成分的开发和评价方法。然而,本文感兴趣的主要领域是,将听诊器放置在半月瓣(称为主动脉瓣的位置1和肺动脉瓣的位置2)上,这样可以提供更好的S2声音质量。在心室(AV)可以更清楚地听到S1心音,其中二尖瓣位于第3位,三尖瓣位于第4位。通过MFCC特征、不同数目的HMM状态和不同数目的高斯混合的对比实验,考察这些因素对心音听诊4个位置分类性能的影响。有趣的是,五状态模型比四状态模型表现得更好,四状态模型被认为是对心音的四个基本组成部分进行建模。可以说,在所有高斯混合模型和四个位置上的五状态平均值提供了90.1%的最佳整体性能。
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引用次数: 7
Voice pathology detection in continuous speech using nonlinear dynamics 基于非线性动力学的连续语音病理检测
J. Orozco-Arroyave, J. Vargas-Bonilla, J. B. Alonso, M. A. Ferrer-Ballester, C. Travieso-González, P. H. Rodríguez
A novel methodology, based on the estimation of nonlinear dynamics features, is presented for automatic detection of pathologies in the phonatory system considering continuous speech records (text-dependent). The proposed automatic segmentation and characterization of the voice registers does not require the estimation of the pitch period, therefore it doesn't depend on the gender and intonation of the patients. A robust methodology for finding the features that better discriminate between healthy and pathological voices and also for analyzing the affinity among them is also presented. An average success rate of 95% ± 3.54% in the automatic detection of voice pathologies is achieved considering only six features. The results indicate that nonlinear dynamics is a good alternative for automatic detection of abnormal phonations in continuous speech.
提出了一种基于非线性动态特征估计的新方法,用于考虑连续语音记录(文本依赖)的语音系统中的病理自动检测。所提出的语音寄存器的自动分割和表征不需要估计音高周期,因此不依赖于患者的性别和语调。还提出了一种强大的方法,用于发现更好地区分健康和病理声音的特征,并用于分析它们之间的亲和力。仅考虑6个特征,语音病理自动检测的平均成功率为95%±3.54%。结果表明,非线性动力学是连续语音异常语音自动检测的一种很好的替代方法。
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引用次数: 11
ECG signal classification using support vector machine based on wavelet multiresolution analysis 基于小波多分辨率分析的支持向量机心电信号分类
Ayman Rabee, I. Barhumi
In this paper we propose a highly reliable ECG analysis and classification approach using discrete wavelet transform multiresolution analysis and support vector machine (SVM). This approach is composed of three stages, including ECG signal preprocessing, feature selection, and classification of ECG beats. Wavelet transform is used for signal preprocessing, denoising, and for extracting the coefficients of the transform as features of each ECG beat which are employed as inputs to the classifier. SVM is used to construct a classifier to categorize the input ECG beat into one of 14 classes. In this work, 17260 ECG beats, including 14 different beat types, were selected from the MIT/BIH arrhythmia database. The average accuracy of classification for recognition of the 14 heart beat types is 99.2%.
本文提出了一种基于离散小波变换、多分辨率分析和支持向量机(SVM)的高可靠性心电分析与分类方法。该方法由心电信号预处理、特征选择和心电拍频分类三个阶段组成。小波变换用于信号预处理,去噪,并提取变换系数作为每个心电拍的特征,这些特征被用作分类器的输入。使用支持向量机构建分类器,将输入的心电拍分为14类。在这项工作中,从MIT/BIH心律失常数据库中选择了17260次心电图,包括14种不同的心跳类型。对14种心跳类型的分类识别平均准确率为99.2%。
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引用次数: 27
Forming projection images from each layer of retina using diffusion may based OCT segmentation 利用基于扩散的OCT分割从视网膜的每一层形成投影图像
Jalil Jalili, H. Rabbani, M. Akhlaghi, R. Kafieh, A. M. Dehnavi
Optical coherence tomography (OCT) is an effective and noninvasive modality for retinal imaging. 3-D data that acquired from 3-D Spectral Domain OCT (SD-OCT) have shown their importance in the evaluation of retinal diseases. In addition, this set of data provides an opportunity to study depth of retina. In this paper, we focus on forming X-Y axis images from each layer of retina. In this manner, we first choose diffusion map based segmentation for localization of 12 different boundaries in 3D retinal data. Then we take an average on layers which located between each pairs of detected boundaries. Therefore, we make the X-Y axis image from each layer. With wavelet based image fusion, we combine together the layers with appropriate information to make images with additional information in retinal depth.
光学相干断层扫描(OCT)是一种有效的、无创的视网膜成像方法。从三维光谱域OCT (SD-OCT)获得的三维数据在视网膜疾病的评估中显示出其重要性。此外,这组数据为研究视网膜的深度提供了机会。在本文中,我们着重于从视网膜的每一层形成X-Y轴图像。因此,我们首先选择基于扩散图的分割方法对3D视网膜数据中的12个不同边界进行定位。然后对每对检测到的边界之间的层取平均值。因此,我们从每一层制作X-Y轴图像。采用基于小波的图像融合方法,将具有适当信息的图层组合在一起,形成具有视网膜深度附加信息的图像。
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引用次数: 4
All-optical ultrafast hilbert transformations based on all-fiber long period grating designs 基于全光纤长周期光栅设计的全光超快希尔伯特变换
R. Ashrafi, J. Azaña
A novel all-optical design for implementing THz-bandwidth real-time Hilbert transformers is proposed and numerically demonstrated. We show that an all-optical Hilbert transformer can be implemented using a uniform-period long-period fiber grating (LPG) with a properly designed amplitude-only grating apodization profile incorporating a single/multiple π-phase-shift(s) along the grating length. The designed LPG for implementation of Hilbert transformer operates in the cross-coupling mode, which can be practically implemented based on either a fiber-optic approach or integrated-waveguide technology. All-optical Hilbert transformers capable of processing arbitrary optical signals with bandwidths well in the THz range can be implemented using feasible LPG designs.
提出了一种实现太赫兹带宽实时希尔伯特变压器的新型全光设计,并进行了数值验证。我们证明了全光希尔伯特变压器可以使用均匀周期长周期光纤光栅(LPG)来实现,该光栅具有适当设计的仅限幅光栅apoapozation轮廓,该轮廓沿光栅长度具有单/多π相移(s)。设计的用于实现Hilbert变压器的LPG工作在交叉耦合模式下,可以基于光纤方法或集成波导技术实现。采用可行的LPG设计,可以实现能够处理带宽在太赫兹范围内的任意光信号的全光希尔伯特变压器。
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引用次数: 0
Automatic conversion system for 3D video generation based on wavelets 基于小波的三维视频生成自动转换系统
V. Ponomaryov, Eduardo Ramos-Díaz, V. Golikov
The 2D to 3D conversion is currently a hot topic for several applications because of the 3D content lack in a new era of different hardware. The proposed algorithm in 3D reconstruction is based on the wavelets, especially on the wavelet atomic functions (WAF), which are used in the computation of the disparity maps employing multilevel decomposition, and technique of 3D visualization via color anaglyphs synthesis. Novel approach performs better in depth and spatial perception than do existing techniques, both in terms of objective SSIM criterion and based on the more subjective measure of human vision that has been confirmed in numerous simulation results obtained in synthetic images, in synthetic video sequences and in real-life video sequences.
由于3D内容在不同硬件的新时代缺乏,2D到3D的转换目前是一些应用的热门话题。本文提出的三维重建算法是基于小波,特别是基于小波原子函数(WAF)的多级分解计算视差图,以及基于彩色解析合成的三维可视化技术。无论是在客观的SSIM标准方面,还是在更主观的人类视觉测量基础上,新方法在深度和空间感知方面都比现有技术表现得更好,这在合成图像、合成视频序列和现实视频序列中获得的大量仿真结果中得到了证实。
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引用次数: 1
Wall clutter mitigation for MIMO radar configurations in urban sensing 城市传感中MIMO雷达配置的壁杂波抑制
F. Ahmad, M. Amin
Strong front wall returns tend to obscure indoor targets and render through-the-wall target detection difficult and challenging. Among the various techniques proposed for wall clutter mitigation under monostatic radar operation is subspace projection. This technique uses the strength of the wall EM reflections relative to that of the target to separate the wall subspace from the target subspace. In this paper, we present analyses of the subspace projection approach for suppressing wall clutter and preserving indoor targets in multi-input multi-output (MIMO) through-the-wall radar imaging systems. We highlight the similarities and the differences in performance of the subspace technique under MIMO and monostatic configurations. Supporting results based on simulated and experimental data are provided.
强前墙回波往往会模糊室内目标,使穿墙目标检测变得困难和具有挑战性。在单基地雷达工作条件下,抑制壁面杂波的技术有子空间投影。该技术使用相对于目标的壁EM反射强度来分离壁子空间和目标子空间。本文分析了多输入多输出(MIMO)穿墙雷达成像系统中抑制墙壁杂波和保留室内目标的子空间投影方法。我们强调了子空间技术在MIMO和单稳态配置下性能的异同。给出了基于仿真和实验数据的支持结果。
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引用次数: 17
Object- versus pixel-based building detection for disaster response 灾害响应中基于物体与基于像素的建筑物检测
D. Dubois, R. Lepage
Recent disasters have shown that there is a growing interest for remotely sensed data to support decision makers and emergency teams in the field. Fast and accurate detection of buildings and sustained damage is of great importance. Current methods rely on numerous photo-interpreters to visually analyze the data. Multiple pixel-based methods exist to classify pixels as being part of a building or not but results vary widely and precision is often poor with very high resolution images. This paper proposes an object-based solution to building detection and compares it to a traditional approach. Object-based classification clearly provides adequate results in much less time and thus is ideal for disaster response.
最近发生的灾害表明,人们越来越有兴趣利用遥感数据来支持现场的决策者和应急小组。快速准确地检测建筑物和持续损坏是非常重要的。目前的方法依赖于大量的照片解释器来直观地分析数据。目前存在多种基于像素的方法来将像素分类为建筑物的一部分,但结果差异很大,并且对于非常高分辨率的图像,精度通常很差。本文提出了一种基于对象的建筑检测解决方案,并将其与传统方法进行了比较。基于对象的分类显然在更短的时间内提供了足够的结果,因此是灾难响应的理想选择。
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引用次数: 4
Case study: Applying the cosmic ISO 19761 measurement method on an MRI mesh generation medical application 案例研究:将宇宙ISO 19761测量方法应用于MRI网格生成医学应用
Feras AbuTalib, D. Giannacopoulos, A. Abran
This paper addresses the problem of applying the COSMIC ISO 19761 measurement method on a Magnetic Resonance Imaging (MRI) medical software application. The application in our case study uses 3D constrained Delaunay triangulated algorithms to generate volumetric meshes from the segmented 2D MRI images. The various steps of the measurement method are explored and discussed in details after analyzing the requirements and the system architecture of the application. Examples are presented to illustrate how the measurement results obtained can be beneficial to researchers evaluating and comparing such applications.
本文讨论了在磁共振成像(MRI)医学软件应用中应用COSMIC ISO 19761测量方法的问题。在我们的案例研究中,应用程序使用3D约束Delaunay三角化算法从分割的2D MRI图像中生成体积网格。在分析了应用的需求和系统架构后,对测量方法的各个步骤进行了详细的探索和讨论。举例说明如何测量结果获得可以有利于研究人员评估和比较这些应用。
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引用次数: 0
期刊
2012 11th International Conference on Information Science, Signal Processing and their Applications (ISSPA)
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