脱机手写数字识别方法

脱机手写体数字识别有着重大的使用价值,特征提取占据了重要的位置.提出了一种通过拓扑特征构造的特征提取新方法,利于了9种特征对数字进行特征提取,然后利用分类树的方法将数字进行分类.最后,在本科学生手写数字图像样本库上的试验结果表明,提出的特征提取方法不仅具有很快的运算能力,而且较大幅度地提高了识别率.     

结合Fisher判别的手写数字特征提取方法

在手写数字图像的特征提取中,提出一种结合Fisher线性判别的多分辨率Gabor滤波方法,在所有特征点上寻求特定滤波方向上的局部最优滤波频率,以获得最佳滤波效果,同时压缩不相关特征.在MNIST手写数字图像库上的识别实验表明:在小样本情况下,该方法能更准确地抽取手写数字图像特征,识别效果明显优于直接进行Gabor特征提取.     

无指针式仪表表盘数字识别方法的研究

针对无指针式仪表表盘的数字识别问题,提出了一种基于特征提取和粗糙集特征约简的神经网络数字识别方法.首先利用数字图像预处理技术处理图像,并利用特征提取方法提取数字图像特征;然后利用粗糙集理论进行特征约简;最后将约简后的信息输入到训练好的神经网络进行识别.实验表明,相对于传统方法,该方法具有识别率高、速度快的特点,实用价值较高.     

基于模板匹配的手写数字决策分类器设计

针对手写数字识别提出一种基于模板匹配决策分类器设计方法。就该方法下的模式识别分类器设计进行详细论述,给出该分类器算法实现。该算法在对手写的数字图像进行预处理的基础上从待识别的手写数字图像中提取若干特征量与事先建立的标准模板库中模板对应的特征量进行比较,计算待识别图像和标准模板特征量之间的距离,用最小距离法判定其所属类。实验结果表明,该决策分类器算法实现容易,匹配速度快,保证字符识别的正确率。     

基于模板匹配的手写数字决策分类器设计

针对手写数字识别提出一种基于模板匹配决策分类器设计方法。就该方法下的模式识别分类器设计进行详细论述,给出该分类器算法实现。该算法在对手写的数字图像进行预处理的基础上从待识剐的手写数字图像中提取若干特征量与事先建立的标准模板库中模板对应的特征量进行比较,计算待识别图像和标准模板特征量之间的距离,用最小距离法判定其所属类。实验结果表明,该决策分类器算法实现容易,匹配速度快,保证字符识别的正确率。     

基于决策树的快速在线手写数字识别技术

本文提出了一种快速的在线手写数字识别方法，该法采用书写笔划走势对手写数字进行建模，运用决策树学习算法进行数字分类识别。数字笔划走势特征提取简单、区分度高、对用户不敏感，实现了有限的资源条件下的高速识别，同时保证了方法的良好用户适应性；决策树学习算法分类情况全面，保证了方法的高识别率。实验结果表明：该方法既具有简单高效的特点，又具备很好的用户适应性。     

基于神经网络数字识别方法的研究

针对无指针式仪表表盘的数字识别问题,提出一种基于特征提取和粗糙集特征约简的神经网络数字识别方法;该方法首先利用数字图像预处理技术处理图像并利用特征提取方法提取数字图像特征,然后利用粗糙集理论进行特征约简,最后将约简后的信息输入到训练好的神经网络进行识别;实验表明,相对于传统方法,该方法具有识别率高、速度快的特点,具有较高的实用价值;并且该方法在保留神经网络高鲁棒性的同时,为快速准确地进行数字识别开辟了新的途径。     

仪表表盘数字识别方法的研究

针对无指针式仪表表盘的数字识别问题,提出一种基于特征提取和粗糙集特征约简的神经网络数字识别方法.该方法首先利用数字图像预处理技术处理图像并利用特征提取方法提取数字图像特征,然后利用粗糙集理论进行特征约简,最后将约简后的信息输入到训练好的神经网络进行识别.     

基于支持向量机的手写签名研究

针对一般手写签名中特征提取方法的不足,将支持向量机的原理引人到手写签名算法里,从而可以很好地应用于高维数据,避免了特征提取中维数灾问题.主要研究如何在标准的窗格中利用扫描的方法提取图像密度特征,从而得到特征向量.通过MATLAB工具,将得到的图像密度特征作为特征向量为SVM的输入进行训练仿真实验.实验表明,该方法能够有效识别手写签名真伪,说明把支持向量机应用到手写签名具有很好的识别能力,并解决了"维数灾"的问题.     

基于模糊模式的手写数字识别

手写体数字识别是一个难度很大,但却具有广阔应用前景的研究课题.文章提出了一种基于模糊模式识别和BP神经网络技术对手写数字进行识别的算法:首先应用BP神经网络技术对手写数字样本进行学习,然后结合模糊模式识别方法进行手写数字识别.实验表明,该方法的正确识别率达95%以上.     

A new benchmark on the recognition of handwritten Bangla and Farsi numeral characters

The recognition of Indian and Arabic handwriting is drawing increasing attention in recent years. To test the promise of existing handwritten numeral recognition methods and provide new benchmarks for future research, this paper presents some results of handwritten Bangla and Farsi numeral recognition on binary and gray-scale images. For recognition on gray-scale images, we propose a process with proper image pre-processing and feature extraction. In experiments on three databases, ISI Bangla numerals, CENPARMI Farsi numerals, and IFHCDB Farsi numerals, we have achieved very high accuracies using various recognition methods. The highest test accuracies on the three databases are 99.40%, 99.16%, and 99.73%, respectively. We justified the benefit of recognition on gray-scale images against binary images, compared some implementation choices of gradient direction feature extraction, some advanced normalization and classification methods.     

手写体数字识别与认证的小波特征提取

本文提出了基于Kirsch边缘增强的二维小波特征与二维复小波特征的提取技术。这两类特征与几何特征融合识别手写体数字。此外，对所提取的小波特征提取方法的优点进行了讨论。最后进行的手写体数字识别与认证实验表明，这两类混合特征的集合能获得很好的识别与认证性能。     

基于BP神经网络的手写数字识别算法研究

讨论了一个手写数字识别系统的原理及其实现。特征提取的方法是:计算字体轮廓的曲率特征,并在计算曲率的过程中使用了B样条函数;对曲率进行了大小和平移规整化,这样得到的曲率具有大小和方向的不变性。为了得到更紧凑的特征,采用了小波对其进行降维。采用了BP神经网络作为分类器,实验结果表明,对于字形相似的数字也达到了较高的识别率。还简介了识别系统的模块设计和界面设计。     

Handwritten Bangla numeral recognition system and its application to postal automation

A recognition system for handwritten Bangla numerals and its application to automatic letter sorting machine for Bangladesh Post is presented. The system consists of preprocessing, feature extraction, recognition and integration. Based on the theories of principal component analysis (PCA), two novel approaches are proposed for recognizing handwritten Bangla numerals. One is the image reconstruction recognition approach, and the other is the direction feature extraction approach combined with PCA and SVM. By examining the handwritten Bangla numeral data captured from real Bangladesh letters, the experimental results show that our proposed approaches are effective. To meet performance requirements of automatic letter sorting machine, we integrate the results of the two proposed approaches with one conventional PCA approach. It has been found that the recognition result achieved by the integrated system is more reliable than that by one method alone. The average recognition rate, error rate and reliability achieved by the integrated system are 95.05%, 0.93% and 99.03%, respectively. Experiments demonstrate that the integrated system also meets speed requirement.     

基于方向线素特征的孟加拉手写数字识别

根据孟加拉数字的特点,将方向线素特征应用于孟加拉手写数字识另怕g特征提取,并辅以端点和交叉点特征,采用BP神经网络作分类器进行识别。利用从实际盂加拉信封图像中采集到的手写体数字作为样本进行实验,结果表明,该方法的识别率和可靠性分别达到97．63％和98．77％。     

定位格中手写体数字串的提取

本文主要针对手写体数字串和定位格(线) 相粘连的情况,首次提出完整提取这种数字串的方法。首先运用数学形态学运算进行粗处理,去除定位格,得到特征点,然后结合数字的结构特征对它修补,最后进行平滑处理。实验表明本文方法的有效性。     

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%.     

Unconstrained handwritten numeral recognition based on radial basiscompetitive and cooperative networks with spatio-temporal featurerepresentation

This paper presents a new approach to representation and recognition of handwritten numerals. The approach first transforms a two-dimensional (2-D) spatial representation of a numeral into a three-dimensional (3-D) spatio-temporal representation by identifying the tracing sequence based on a set of heuristic rules acting as transformation operators. A multiresolution critical-point segmentation method is then proposed to extract local feature points, at varying degrees of scale and coarseness. A new neural network architecture, referred to as radial-basis competitive and cooperative network (RCCN), is presented especially for handwritten numeral recognition. RCCN is a globally competitive and locally cooperative network with the capability of self-organizing hidden units to progressively achieve desired network performance, and functions as a universal approximator of arbitrary input-output mappings. Three types of RCCNs are explored: input-space RCCN (IRCCN), output-space RCCN (ORCCN), and bidirectional RCCN (BRCCN). Experiments against handwritten zip code numerals acquired by the U.S. Postal Service indicated that the proposed method is robust in terms of variations, deformations, transformations, and corruption, achieving about 97% recognition rate.     

Multiresolution recognition of unconstrained handwritten numerals with wavelet transform and multilayer cluster neural network

In this paper, we propose a new scheme for multiresolution recognition of unconstrained handwritten numerals using wavelet transform and a simple multilayer cluster neural network. The proposed scheme consists of two stages: a feature extraction stage for extracting multiresolution features with wavelet transform, and a classification stage for classifying unconstrained handwritten numerals with a simple multilayer cluster neural network. In order to verify the performance of the proposed scheme, experiments with unconstrained handwritten numeral database of Concordia University of Canada, Electro-Technical Laboratory of Japan, and Electronics and Telecommunications Research Institute of Korea were performed. The error rates were 3.20%, 0.83%, and 0.75%, respectively. These results showed that the proposed scheme is very robust in terms of various writing styles and sizes.