基于 Adaboost的手写体数字识别

提出了一种新的基于集成学习算法Adaboost的手写体数字识别系统。Adaboost方法可以在仅比随机预测略好的弱分类器基础上构建高精度的强分类器。实验证明,基于Adaboost的手写体数字识别系统具有较高的识别率和泛化能力,已经应用在OCR识别软件中。     

手写体字符识别的多特征多分类器设计

特征选取和分类器设计是字符识别系统设计的关键。文章针对手写体汉字和阿拉伯数字混和字符集的识别提出了依据不同的分类要求,分别选取不同的字符特征并采用神经网络多分类器进行识别的设计方法。实验结果表明,该方法用于手写体混合字符集的识别是行之有效的。     

基于多分类器组合的一种手写体数字识别方法

提出了一种手写体数字识别系统.该系统由三级分类器组成第一级提取交叉点、闭和圆等结构特征,并用模板匹配的方法进行分类;第二级由两个并行的神经网络分类器组成,每个分类器分别使用不同的统计特征;第三级是综合分类器,它将第二级的输出作为输入,根据投票规则得到最后的输出结果.多分类器组合可以集合分类器的优点,提高整个识别系统的识别精度和可靠性.     

基于最近邻聚类算法自适应模糊分类器

以手写体数字识别问题为背景,提出了一种基于最近邻聚类算法的自适应模糊分类器,并用Matlab给出了自适应模糊分类器的实现,进而对其进行了仿真。仿真结果表明,所提出的自适应模糊分类器在手写体数字识别的识别性能、利用语言信息、计算复杂性等方面均优于采用BP算法的三层前馈分类器,体现了自适应模糊处理技术用于模式识别的优越性和潜力。     

基于贝叶斯网络的脱机手写体汉字智能识别

针对汉字识别的超多类问题,将贝叶斯网络分类器引入小样本字符集脱机手写体汉字识别中．对手写大写数字汉字的小样本字符集构造识别系统,同时与传统的欧氏距离方法进行比较,实验表明该算法将识别率提高到92．4％,在小样本字符集脱机手写体识别中具有较强的实用性和良好的扩展性．     

基于表格查寻学习算法的自适应模糊分类器

以手写体数字识别问题为背景,提出了一种基于表格查寻学习算法的自适应模糊分类 器,并用Matlab给出了自适应模糊分类器的实现,进而对其进行了仿真。仿真结果表明,该自适应模 糊分类器在手写体数字识别的识别性能、利用语言信息、计算复杂性等方面均优于采用BP算法的三 层前馈分类器,体现了自适应模糊处理技术用于模式识别的优越性和潜力。     

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。     

一种基于方向特征的孟加拉手写体数字识别方法

本文根据孟加拉数字的特点，用Kirsch算子提取字符图像象素的水平、垂直、右对角线和左对角线特征矢量，采用BP神经网络作分类器进行识别。实验结果显示，对于孟加拉手写体数字具有较高的识别率和较快的识别速度，并对其它手写体数字也有很强的应用性。     

手写体数字识别技术的研究

手写体数字识别特征提取方面，有模板匹配，统计特征和结构特征，在分类器设计上有基于距离的分类器和神经网络分类器等，分析和评价了这些问题后，指出今后的研究方向应在特征综合，分类器集成以及新的分类器的研究上。     

基于Bagging的手写体数字识别系统

Bagging是一种用来提高学习算法准确度的方法,通过构造一系列预测函数并将其结果按投票规则进行合成,就可以将一个弱学习算法提升为强学习算法。本文针对UK测试量表中的手写体数字,设计并实现了一个以神经网络为弱分类器的、基于Bagging的手写体数字识别系统。与单个神经网络分类器相比,Bagging后的系统显示了更加优良的性能。     

SEPARATION OF SINGLE-TOUCHING HANDWRITTEN NUMERAL STRINGS BASED ON STRUCTURAL FEATURES

In this paper, we develop a new method to separate single-touching handwritten numeral strings with two numerals using structural features. A binary image of a single-touching handwritten numeral string is preprocessed with an efficient algorithm for smoothing, linearization and detection of structural points of image contours. The touching region of a single-touching handwritten numeral string is determined based on distribution of the structural points in the handwritten numeral string. A candidate touching point is preselected based on the geometrical information of a special structural point in the touching region. In some cases, the left or right lateral numeral of a single-touching handwritten numeral string can be recognized. The recognition information can be utilized to correct the position of the candidate touching point. We have tested our method on image samples taken from the U.S. National Institute of Science and Technology (NIST) database. We used 500 sample images for training and obtained a correct separation rate of 99.1%. For 3287 test samples not used for training the correct separation rate was 97.2%.     

An MLP-orthogonal Gaussian mixture model hybrid model for Chinese bank check printed numeral recognition

A hybrid model based on the combination of an orthogonal Gaussian mixture model (OGMM) and a multilayer perceptron (MLP) is proposed in this paper that is to be used for Chinese bank check machine printed numeral recognition. The combination of MLP with OGMM produces a hybrid model with high recognition accuracy as well as an excellent outlier rejection ability. Experimental results show that the proposed model can satisfy the requirements of Chinese bank check printed numeral recognition where high recognition accuracy, high processing speed, and high reliability are needed. Correspondence to: Hui Zhu     

基于主分量分析法的脱机手写数字识别

针对手写数字识别研究中统计特征和结构特征融合困难的问题，利用主分量分析法提取数字字符结构特征的统计信息，重建数字模型，并估计重构偏差，同时提取数字的高宽比特征和欧拉特征，通过组合与3种特征相对应的贝叶斯分类器的分类结果实现数字识别。使用该方法对样本库中的样本进行测试，正确识别率为90.73%。     

小波神经网络在手写数字识别中研究与应用

针对手写数字识别的特点,讨论了数字识别预处理的方法,包括二值化、倾斜矫正、细化和归一化。利用小波函数代替传统神经网络中的激活函数,构建了用于数字识别,小波神经网络系统。仿真结果显示,新系统大大提高了网络训练速度,数字识别的正确率也明显提高。     

Handwritten numeral recognition based on simplified structural classification and fuzzy memberships

Previous handwritten numeral recognition algorithms applied structural classification to extract geometric primitives that characterize each image, and then utilized artificial intelligence methods, like neural network or fuzzy memberships, to classify the images. We propose a handwritten numeral recognition methodology based on simplified structural classification, by using a much smaller set of primitive types, and fuzzy memberships. More specifically, based on three kinds of feature points, we first extract five kinds of primitive segments for each image. A fuzzy membership function is then used to estimate the likelihood of these primitives being close to the two vertical boundaries of the image. Finally, a tree-like classifier based on the extracted feature points, primitives and fuzzy memberships is applied to classify the numerals. With our system, handwritten numerals in NIST Special Database 19 are recognized with correct rate between 87.33% and 88.72%.     

手写表格识别系统研究和实现

对手写表格数字识别系统进行研究,提出了输出规则的概念,解决了常用表格数据识别处理的输出描述问题.用此方法已成功地开发出手写数字表格识别处理系统,该系统具有运算量小、抗干扰性强、通用性好、识别率高等特点.     

基于神经网络的数字识别

本文介绍了神经网络、数字识别的相关内容及其概念,在此基础上重点研究了基于神经网络的数字识别系统。本文对基于神经网络的数字识别系统包含的功能,以及每个功能模块所使用的技术进行了阐述。最后对基于神经网络的数字识别系统所具有的优点进行了分析和讨论。     

A genetic framework using contextual knowledge for segmentation and recognition of handwritten numeral strings

For the first time, a genetic framework using contextual knowledge is proposed for segmentation and recognition of unconstrained handwritten numeral strings. New algorithms have been developed to locate feature points on the string image, and to generate possible segmentation hypotheses. A genetic representation scheme is utilized to show the space of all segmentation hypotheses (chromosomes). For the evaluation of segmentation hypotheses, a novel evaluation scheme is introduced, in order to improve the outlier resistance of the system. Our genetic algorithm tries to search and evolve the population of segmentation hypotheses, and to find the one with the highest segmentation/recognition confidence. The NIST NSTRING SD19 and CENPARMI databases were used to evaluate the performance of our proposed method. Our experiments showed that proper use of contextual knowledge in segmentation, evaluation and search greatly improves the overall performance of the system. On average, our system was able to obtain correct recognition rates of 95.28% and 96.42% on handwritten numeral strings using neural network and support vector classifiers, respectively. These results compare favorably with the ones reported in the literature.     

钢卷尺套印数码轮控制系统设计

详细阐述了一种新的钢卷尺套印数码轮控制系统,系统采用电控套印技术取代了原来的机械式套印技术,具有速度快,精度高,稳定性好等优点,在实际的应用中取得了良好的效果。电控系统采用PIC18LF4525单片机、步进电机驱动芯片MTD2009及其细分驱动技术等来实现。     

Combination of the assembly neural network with a perceptron for recognition of handwritten digits arranged in numeral strings

The purpose of the paper is to design and test neural network structures and mechanisms for making use of the information that is contained in the character strings for more correct recognition of the characters constituting these strings. Two neural networks are considered in the paper; both networks are combined into a joint recognition system. The first is the assembly neural network and the second is the neural network of a perceptron type. A computer simulation of the system is performed. The combined system solves the task of recognition of handwritten digits of the MNIST test set provided that the digits have been arranged in the numeral strings memorized in the system. During a recognition process of an input numeral string, the assembly neural network executes intermediate recognition of the digits basing on which a perceptron type network accomplishes the final choice among the limited combinations of strings memorized in the network. The experiments have demonstrated that the combined system is able to make use of the information that is contained in the strings for more correct recognition of digits of the MNIST test set. In particular, the experiments have shown that the combined system commits no errors in the recognition of MNIST test set on the condition that the digits of this set had been organized in the strings of more than 5 digits each.