Speaker identification based on the frame linear predictive coding spectrum technique

In this paper, a frame linear predictive coding spectrum (FLPCS) technique for speaker identification is presented. Traditionally, linear predictive coding (LPC) was applied in many speech recognition applications, nevertheless, the modification of LPC termed FLPCS is proposed in this study for speaker identification. The analysis procedure consists of feature extraction and voice classification. In the stage of feature extraction, the representative characteristics were extracted using the FLPCS technique. Through the approach, the size of the feature vector of a speaker can be reduced within an acceptable recognition rate. In the stage of classification, general regression neural network (GRNN) and Gaussian mixture model (GMM) were applied because of their rapid response and simplicity in implementation. In the experimental investigation, performances of different order FLPCS coefficients which were induced from the LPC spectrum were compared with one another. Further, the capability analysis on GRNN and GMM was also described. The experimental results showed GMM can achieve a better recognition rate with feature extraction using the FLPCS method. It is also suggested the GMM can complete training and identification in a very short time.     

基于模糊核聚类和SVM的说话人辨识

支持向量机作为一种新的统计学习方法,在说话人识别中得到了广泛应用.本文针对支持向量机在说话人辨识中的大样本训练耗时问题,提出对语音参数进行模糊核聚类的约简方法,选择聚类边界的语音参数作为支持向量,可以在不影响识别率的情况下,减少支持向量机的训练量.并通过实验验证了该方法的有效性.     

Classification of process trends based on fuzzified symbolic representation and hidden Markov models

This paper presents a strategy to represent and classify process data for detection of abnormal operating conditions. In representing the data, a wavelet-based smoothing algorithm is used to filter the high frequency noise. A shape analysis technique called triangular episodes then converts the smoothed data into a semi-qualitative form. Two membership functions are implemented to transform the quantitative information in the triangular episodes to a purely symbolic representation. The symbolic data is classified with a set of sequence matching hidden Markov models (HMMs), and the classification is improved by utilizing a time correlated HMM after the sequence matching HMM. The method is tested on simulations with a non-isothermal CSTR and compared with methods that use a back-propagation neural network with and without an ARX model.     

A face recognition system based on Pseudo 2D HMM applied to neural network coefficients

Face recognition from an image or video sequences is emerging as an active research area with numerous commercial and law enforcement applications. In this paper different Pseudo 2-dimension Hidden Markov Models (HMMs) are introduced for a face recognition showing performances reasonably fast for binary images. The proposed P2-D HMMs are made up of five levels of states, one for each significant facial region in which the input frontal images are sequenced: forehead, eyes, nose, mouth and chin. Each of P2-D HMMs has been trained by coefficients of an artificial neural network used to compress a bitmap image in order to represent it with a number of coefficients that is smaller than the total number of pixels. All the P2-D HMMs, applied to the input set consisting of the Olivetti Research Laboratory face database combined to others photos, have achieved good rates of recognition and, in particular, the structure 3-6-6-6-3 has achieved a rate of recognition equal to 100%.     

Language identification in web documents using discrete HMMs

This paper deals with language identification in the domain of web documents. The proposed system is built on hidden Markov models (HMMs) that enable the modeling of character sequences. Furthermore, the use of HMMs provides the means for language tracking, that is, language identification across the segments of a multilingual document.     

Local fuzzy PCA based GMM with dimension reduction on speaker identification

To reduce the high dimensionality required for training of feature vectors in speaker identification, we propose an efficient GMM based on local PCA with fuzzy clustering. The proposed method firstly partitions the data space into several disjoint clusters by fuzzy clustering, and then performs PCA using the fuzzy covariance matrix on each cluster. Finally, the GMM for speaker is obtained from the transformed feature vectors with reduced dimension in each cluster. Compared to the conventional GMM with diagonal covariance matrix, the proposed method shows faster result with less storage maintaining same performance.     

10Gb/s线速可扩展P2P流量识别引擎

通过引入流特征统计和深度数据包检测相结合的思想,设计了一种可扩展的10Gb/s线速P2P流量识别引擎,给出了该引擎的硬件实现方案,详细介绍了方案中已知流过滤、传输层特征统计、净荷关键词匹配等核心部分的实现。测试表明,该引擎可完全实现10Gb/s速率下的P2P流量线速识别,识别准确率大于95%。     

3D object recognition based on curvature information of planar views

In this paper, a 3D object recognition algorithm is proposed. Objects are recognized by studying planar images corresponding to a sequence of views. Planar shape contours are represented by their adaptively calculated curvature functions, which are decomposed in the Fourier domain as a linear combination of a set of representative shapes. Finally, sequences of views are identified by means of Hidden Markov Models. The proposed system has been tested for artificial and real objects. Distorted and noisy versions of the objects were correctly clustered together.     

基于加速度传感器的连续动态手势识别

针对个体手势动作信号的差异性和不稳定性,提出了一种基于加速度传感器的连续动态手势识别方法.通过MEMS加速度传感器采集手势动作信号,并结合手势信号的动作特征,对单个手势的有效数据进行自动定位截取,经预处理和特征提取后,构建隐马尔可夫模型(HMM)以实现对特定手势的实时识别.通过设计实现了一种可穿戴手势信号采集硬件原型系统,对10类手势的1000个手势数据进行识别对比实验,统计结果表明:该方法可以对连续手势进行实时有效的识别.     

A multiscale edge detection algorithm based on wavelet domain vector hidden Markov tree model

The wavelet analysis is an efficient tool for the detection of image edges. Based on the wavelet analysis, we present an unsupervised learning algorithm to detect image edges in this paper. A wavelet domain vector hidden Markov tree (WD-VHMT) is employed in our algorithm to model the statistical properties of multiscale and multidirectional (subband) wavelet coefficients of an image. With this model, each wavelet coefficient is viewed as an observation of its hidden state and the hidden state indicates if the wavelet coefficient belongs to an edge. The WD-VHMT model can be learned by an expectation-maximization algorithm. After the model is learned, we employ an extended Viterbi algorithm to uncover the hidden state sequences according to the maximum a posterior estimation. The experiment results of the edge detection for several images are provided to evaluate our algorithm.     

基于细胞神经网络的生物芯片图像实时处理

运用CNN设计了一套生物芯片样点识别算法。算法实现的目标:改善已有方法的缺陷,达到良好的图像质量增强效果;将CNN输出的模拟信号图像转化为样点数据信息,使得后续的信息分析成为可能。最后利用实际CNN芯片参数估算了整套算法的运算时间,结果显示其速度达到实时处理的标准。     

基于网络流内在特征的P2P业务识别技术研究

分析了几类主要的P2P业务识别方法,重点分析了基于流的内在特征的各种识别方法,并对其优缺点作出评价,指出了P2P识别技术进一步的发展方向.