Feature recognition using ART2: a self-organizing neural network

A self-organizing neural network, ART2, based on adaptive resonance theory (ART), is applied to the problem of feature recognition from a boundary representation (B-rep) solid model. A modified face score vector calculation scheme is adopted to represent the features by continuous-valued vectors, suitable to be input to the network. The face score is a measure of the face complexity based upon the convexity or concavity of the surrounding region. The face score vector depicts the topological relations between a face and its neighbouring faces. The ART2 network clusters similar features together. The similarity of the features within a cluster is controlled by a vigilance parameter. A new feature presented to the net is associated with one of the existing clusters, if the feature is similar to the members of the cluster. Otherwise, the net creates a new cluster. An algorithm of the ART2 network is implemented and tested with nine different features. The results obtained indicate that the network has significant potential for application to the problem of feature recognition.     

基于形心同心圆结构的自由手写体数字神经网络分类器

本文提出了一种基于自由手写体数字的形心同心圆结构来提取贯穿特征码的神经网络识别方法。该方法是用自由手写体数字的形心同心圆来抽取其贯穿特征码，将获得的这些模式特征训练改进的ＢＰ神经网络分类器，从而达到快速分类的目的。将其应用于自由手写体数字的信函自动分拣系统，单字的识别率达到９７％以上，整信的识别率也可达到９２％以上，得到了令人满意的结果。     

结合自适应融合网络与哈希的图像检索算法

卷积神经网络因其对图像识别准确率高而在图像检索领域备受青睐,但处理大规模数据集时,基于卷积神经网络提取的深度特征维度高,容易引发"维度灾难".针对图像检索中深度特征维度高的问题,提出一种基于自适应融合网络特征提取与哈希特征降维的图像检索算法.由于传统哈希处理高维特征复杂度高,因此本文在卷积神经网络中加入自适应融合模块对特征进行重新整合,增强特征表征能力的同时降低特征维度;然后应用稀疏化优化算法对深度特征进行第2次降维,并通过映射获得精简的哈希码;最后,实验以Inception网络作为基础模型,在数据集CIFAR-10和ImageNet上进行了丰富的实验.实验结果表明,该算法能有效提高图像检索效率.     

基于多特征融合和BoostingRBF神经网络的人脸识别

提出一种多特征信息融合的人脸识别方法.应用Zernike矩方法和非负矩阵分解法(NMF)分别提取具有旋转不变性的人脸几何特征和人脸子空间投影系数特征,将这两种具有一定互补性的特征串行融合,得到一个分类能力更强的特征.在此基础上,采用RBF神经网络进行人脸识别.为了提高神经网络的分类准确率和泛化能力,采用Boosting方法进行网络集成.实验结果表明,提出的算法利用较少样本数据即可快速地进行人脸识别.     

Design of parts for cellular manufacturing using neural network-based approach

A neural network approach is applied to the problem of integrating design and manufacturing engineering. The self organising map (SOM) neural network recognizes products and parts which are modeled as boundary representation (B-rep) solids using a modified face complexity code scheme adopted, and forms the necessary feature families. Based on the part features, machines, tools and fixtures are selected. These information are then fed into a four layer feed-forward neural network that provides a designer with the desired features that meet the current manufacturing constraints for design of a new product or part. The proposed methodology does not involve training of the neural networks used and is seen to be a significant potential for application in concurrent engineering where design and manufacturing are integrated.     

基于组合特征和PSO-BP算法的数字识别

提出了一种新的基于组合特征和PSO-BP(particle swarm optimization-backpropagation)算法的数字识别方法,将网格特征、投影特征和欧拉数表示的结构特征按照不同的特征权重系数构成数字图像的组合特征向量,利用PSO-BP神经网络进行识别,充分发挥了粒子群算法的全局寻优能力和BP算法的局部搜索优势.实验表明,该方法识别率高、网络收敛速度快、精度高.     

基于特征面的分层特征识别

为降低特征识别的复杂度,提出基于特征实体、特征实面和特征虚面概念的层次性特征分类方法.通过构造2类神经网络输入矩阵,利用神经网络在特征识别中所具有的优势,实现基于特征面的分层特征识别方法.实例表明：该方法在识别去除材料的特征时比较有效,但识别特征的范围受到一定限制.     

基于外接同心圆结构特征的自由手写体数字神经网络识别方法

本文提出了一种基于外接同心圆结构提取贯穿特征码的自由手写体数字的神经网络识别。该方法是用自由手写体数字的外接同心圆来提取其贯穿持征码，将获得的模式特征训练改进的ＢＰ神经网络分类器，从而达到快速分类的目的。将其应用于邮政编码识别系统，单字的识别率达到９７％以上，整信的识别率可达到９２％以上，得到了令人满意的结果。     

类矩阵神经核特征融合的人脸识别方法

针对人脸识别过程中所提取特征向量的信息不完整性与整体图像信息数据量较大的问题,提出一种类矩阵神经核特征融合的人脸识别方法。该方法为深度神经网络的首层升维操作,首先将人脸数据作为特征向量的集合,利用随机矩阵列采样构成随机特征矩阵;其次设计深度神经核将随机特征矩阵映射为高维空间中的新特征向量;最后利用快速收缩算法求解匹配过程中的不定线性代数方程组,使收敛速度达到二阶收敛。该方法既克服了直接使用人脸图像数据空间复杂度较大的问题,又增加了特征的非线性结构,提高了特征向量的表达能力。实验结果表明,该方法识别率高、稳定性强、鲁棒性好,适合处理大型数据。     

基于卷积特征和贝叶斯分类器的人脸识别

为解决传统人脸识别算法特征提取困难的问题,提出了基于卷积特征和贝叶斯分类器的人脸识别方法,利用卷积神经网络提取人脸特征,通过主成分分析法对特征降维,最后利用贝叶斯分类器进行判别分类,在ORL（olivetti research laboratory）人脸库上进行实验,获得了99.00%的识别准确率。实验结果表明,卷积神经网络提取的人脸图像特征具有很强的辨识度,与PCA（principal component analysis）和贝叶斯分类器结合之后可有效提高人脸识别的准确率。     

First break refraction event picking using fuzzy logic systems

First break picking is a pattern recognition problem in seismic signal processing, one that requires much human effort and is difficult to automate. The authors' goal is to reduce the manual effort in the picking process and accurately perform the picking. Feedforward neural network first break pickers have been developed using backpropagation training algorithms applied either to an encoded version of the raw data or to derived seismic attributes which are extracted from the raw data. The authors summarize a study in which they applied a backpropagation fuzzy logic system (BPFLS) to first break picking. The authors use derived seismic attributes as features, and take lateral variations into account by using the distance to a piecewise linear guiding function as a new feature. Experimental results indicate that the BPFLS achieves about the same picking accuracy as a feedforward neural network that is also trained using a backpropagation algorithm; however, the BPFLS is trained in a much shorter time, because there is a systematic way in which the initial parameters of the BPFLS can be chosen, versus the random way in which the weights of the neural network are chosen     

基于卷积神经网络特征融合的人脸识别算法

为提高卷积神经网络的识别性能,提出了一种基于多种卷积神经网络模型的特征融合方法。论文通过构建一个深度学习网络,将多种卷积神经网络模型如ResNet、InceptionV3和VGG19提取的特征进行融合,并将融合后的特征应用到人脸识别中,据此训练出特征融合网络模型的网络参数;最后利用计算求出的阈值来区分类别。实验结果表明,在人脸库LFW数据集上,论文算法的人脸识别率可达98%;与现有的单一卷积神经网络相比,论文算法识别率更高。     

基于双概率神经网络的纹理图像识别

为提高纹理识别速度,在文献1纹理图像识别正确率较高的基础上,提出一种基于双概率神经网络（DPNN）的纹理图像识别方法。首先构造两个概率神经网络A和B,如果纹理特征明显,以较少的纹理特征能量特征作为网络A的输入参数即可识别,否则再加入统计特征和能量特征一起作为概率神经网络B的输入参数以达到较高的识别率。实验结果表明：采用双概率神经网络的纹理图像识别较文献1有更快的识别速度。     

基于NN/HMM混合模型的汉语地名识别系统

文章介绍了一个基于NN/HMM混合模型的汉语地名识别系统,该系统能自动判别并拒识词表之外的词。文中训练的基于HMM的模型,包括关键词模型、填充模型和“反关键词”模型。笔者对识别器的输出结果进行验证,把基于HMM的统计特征送到神经网络处理,由网络的输出来判断是否为词表之外的词。该文在实验中建立了一个基于传统N-Best方法的基准模型并试验了三种不同的网络拓扑结构,包括前馈后向传播网络、Elman后向传播网络以及可训练级联前导后向传播网络。实验结果表明前馈后向传播网络的性能最好,与基准模型比较平均错误率下降54.4%。     

A new approach for automated parts recognition using time series analysisand neural networks

This paper presents a new approach for automated parts recognition. It is based on the use of the signature and autocorrelation functions for feature extraction and a neural network for the analysis of recognition. The signature represents the shapes of boundaries detected in digitized binary images of the parts. The autocorrelation coefficients computed from the signature are invariant to transformations such as scaling, translation and rotation of the parts. These unique extracted features are fed to the neural network. A multilayer perceptron with two hidden layers, along with a backpropagation learning algorithm, is used as a pattern classifier. In addition, the position information of the part for a robot with a vision system is described to permit grasping and pick-up. Experimental results indicate that the proposed approach is appropriate for the accurate and fast recognition and inspection of parts in automated manufacturing systems.     

Virtual reality of recognition technologies of the improved contour coding image based on level set and neural network models

Image contour-based feature extraction method has been applied to some fields of image recognition and virtual reality. However, image contour features are easily susceptible to factors like noise, rotation and thresholds during extraction and processing. To solve the above problem, this paper proposes a contour coding image recognition algorithm based on level set and BP neural network models. Firstly, level set model is employed to extract the contours of images. Secondly, image coding method proposed herein is used to code images horizontally, vertically and obliquely. At last, BP neural network model is trained to recognize the image codes. Validity of the proposed algorithm is verified by using a set of actual engineering part images as well as MPEG and PLANE databases. The results show that the proposed method achieves high recognition rate and requires small samples, which also exhibits good robustness to external disturbances such as noise and image scaling and rotation.

     

基于BP神经网络的人脸识别方法

人脸自动识别是计算机模式识别领域的一个活跃课题,有着十分广泛的应用前景。文中提出了基于ＢＰ神经网络的人脸识别方法,论述了人脸图像矢量的特征压缩问题、网络隐含层神经元数选取问题、网络输入矢量的标准化处理问题以及网络连接权值选取问题。对于１８人、每人１２幅图像组成的脸图像数据库做识别实验,实验结果表明文中所设计的神经网络分类器比常用的最近邻分类器有效地降低了识别错误率。     

一种特征加权融合人脸识别方法

针对传统人脸识别算法在非限制条件下识别准确率不高的问题,提出了一种特征加权融合人脸识别方法(DLWF⁺)。根据人脸面部左眼、右眼、鼻子、嘴、下巴等5个器官位置,将人脸图像划分成5个局部采样区域;将得到的5个局部采样区域和整幅人脸图像分别输入到对应的神经网络中进行网络权值调整,完成子网络的构建;利用softmax回归求出6个相似度向量并组成相似度矩阵与权向量相乘得出最终的识别结果。经ORL和WFL人脸库上进行实验验证,识别准确率分别达到97%和91.63%。实验结果表明:该算法能够有效提高人脸识别能力,与传统识别算法相比在限制条件和非限制条件下都具有较高的识别准确率。     

Evaluation of unsupervised feature extraction neural networks for face recognition

In this paper, new appearances based on neural networks (NN) algorithms are presented for face recognition. Face recognition is subdivided into two main stages: feature extraction and classifier. The suggested NN algorithms are the unsupervised Sanger principal component neural network (Sanger PCNN) and the self-organizing feature map (SOFM), which will be applied for features extraction of the frontal view of a face image. It is of interest to compare the unsupervised network with the traditional Eigenfaces technique. This paper presents an experimental comparison of the statistical Eigenfaces method for feature extraction and the unsupervised neural networks in order to evaluate the classification accuracies as comparison criteria. The classifier is done by the multilayer perceptron (MLP) neural network. Overcoming of the problem of the finite number of training samples per person is discussed. Experimental results are implemented on the Olivetti Research Laboratory database that contains variability in expression, pose, and facial details. The results show that the proposed method SOFM/MLP neural network is more efficient and robust than the Sanger PCNN/MLP and the Eigenfaces/MLP, when used a few number of training samples per person. As a result, it would be more applicable to utilize the SOFM/MLP NN in order to accomplish a higher level of accuracy within a recognition system.