一种数码显示数字识别算法

介绍了一种简易的LED数字识别的算法。与传统的数字识别方法相比较,识别精度较高。该算法对采集到的4个数字字符二值化后的图像用最近邻算法,并对最近邻得到的结果的置信度进行评估实现数字的识别。利用该方法时,通过对置信度的评估,只有4个数字都具有较高置信度的识别结果才能被接受,否则单独对某个字符重新细化处理,大大提高了识别的精度。减少因镜头模糊,倾斜,光照等因素而造成采集得到的图像的中字符发生的旋转,粘连,部分缺失而引起的误识。在以此算法为基础对256幅图片,每幅图片上4个字符的数字同时进行识别测试,正确识别率达到97.66%,误识率仅为2.34%。实验表明,该算法在识别精度、抗干扰性方面表现良好。     

基于整体特征的快速手写体数字字符识别

该文通过模拟人眼识别数字字符的过程,提出了一种基于字符整体特征(凹凸特征)的快速手写体数字字符识别方法。该方法不需要对字符图像做复杂的细化处理,减少了细化形变可能带来的误识和拒识;也不需要进行复杂的笔道特征分析,因此速度非常快。同时,由于不同人书写的数字字符的整体特征都相同,因此该方法的识别率也非常高。     

基于整体特征的快速手写体数字字符识别

通过对模拟人眼识别数字字符的过程进行研究，提出了一种基于字符整体特征（凹凸特征）的快速手写体数字字符识别方法。该方法不需要对字符图像做复杂的细化处理，减少了细化形变可能带来的误识和拒识；也不需要进行复杂的笔道特征分析，因此速度非常快，同时识别率也非常高。实验结果表明该方法具有很高的识别率。     

一种新的基于字符形状特征的高效车牌识别算法

提出了一种基于字符的凹凸性、弯曲度和交点数等形状特征的车牌字符识别方法,它无须对字符作归一化、细化、倾斜校正这些预处理,也不需要样本图像,降低了字符畸变所产生的误识和拒识,减少了处理时间,提高了识别率。实验结果表明这是一种高效的车牌识别算法,是对现有车牌识别技术的有益补充。     

基于连接段数细化算法的脱机手写体数字识别

本文描述了已有的字符细化算法的思想及其缺陷，在分析细化形变根源的基础上给出了一种新的快速细化算法，并将该算法应用到脱机手写体数字识别过程申。该算法不会产生毛刺和伪分支点。细化後字符骨架形变小，而且速度也比较快，从而提高了手写体数字的识别速度。     

一种改进的模板匹配的数字识别算法

提出了一种改进的模板匹配的数字识别算法,该算法是预先将字符分成若干个集合,经细化得到数字中央的骨骼部分,再对待识别数字提取特征并与训练库中的数字特征加权比较,利用欧式距离最小原则来对数字作出判决,试验结果表明,加权的模板匹配法保证了数字识别的正确率,而对数字进行预分类和细化处理,可以大大缩小模板匹配的识别速度,弥补了模板匹配算法对于大量数字耗时多的缺点,提升了系统速度。     

多字体字符识别的协同模型

提出了一种新的用于多字体字符识别的神经网络模型－协同模型,同时提出了一种新的迭代的协同学习算法,该算法将误识率最高的模式的误识样本作为反馈量来修正原型模式。对大量实际采集所得的多字体字符样本的测试表明,该模型能对训练取得１００％的识别率,对多字体字符测试亲本的识别也能取得很高的识别率（９８．２％）,而且识别速度很快,适用于实时的ＯＣＲ应用。另外,对加噪字符的识别试验表明该模型具有很好的鲁棒性。     

数显数字字符图像特征提取算法的研究与实现

由于数显数字字符有其自身特点,相对于其它类型字符识别存在着新的难点,针对此类数显数字字符采用将细化后的字符图像看作是一幅连通图,选择闭合曲线作为其整体特征对十个数字字符进行初次分类,将笔画端点所处字符图像中四个子区域的位置作为主要的细节特征,对字符进行识别。测试结果表明该算法是可行、有效的。     

数显数字字符图像特征提取算法的研究与实现

由于数显数字字符有其自身特点，相对于其它类型字符识别存在着新的难点，针对此类数显数字字符采用将细化后的字符图像看作是一幅连通图，选择闭合曲线作为其整体特征对十个数字字符进行初次分类，将笔画端点所处字符图像中四个子区域的位置作为主要的细节特征，对字符进行识别。测试结果表明该算法是可行、有效的。     

基于方向轮廓的小波分解车牌字符识别方法

字符识别是车牌识别的技术核心。本文提出了一种快速的车牌字符识别方法。首先提取字符的外轮廓。根据小波分解变换的性质,对字符轮廓进行多分辩分解,得到低分辨率下字符轮廓的近似,通过计算待识别字符与参考字符在多尺度下的轮廓之间的相似度,判别待识别字符与参考字符的匹配程度,最终确定匹配字符。本文对字符匹配算法进行了改进,加快了匹配速度,提高了匹配的可信度。利用本文算法,对1200幅车牌字符图像的识别,准确率达到95.4%,单字符识别平均耗时约为10ms。     

深度EM胶囊网络全重叠手写数字识别与分离EI北大核心CSCD

基于胶囊网络的向量神经元思想和期望最大算法(Expectation-maximization,EM),设计了一种以EM为向量聚类算法的深度胶囊网络(Deep capsule network,DCN),实现了重叠手写数字的识别与分离.该网络由两部分组成,第1部分是“识别网络”,将EM算法改为EM向量聚类算法,以替换原胶囊网络CapsNet中的迭代路由部分,这一改动优化了网络的运算过程,实现了重叠数字识别.第2部分是“重构网络”,由结构完全相同的两个并行网络组成,对双向量进行并行重构,实现了重叠数字的分离.实验结果显示,对于100%全重叠手写数字图片本网络识别率达到了96%,对比CapsNet在80%的重叠率下95%的识别率,本文网络在难度提升的情况下,识别率有明显提高,能够将完全重叠的两张手写数字进行图片进行准确地分离.     

基于改进卷积神经网络的多源数字识别算法

现有的数字识别算法多是对单一类型数字进行识别,无法应对识别多源数字。针对包含手写体数字与数码管数字的字符识别场景,提出一种基于改进卷积神经网络（CNN）的多源数字识别算法。首先,使用从数显仪表生产企业现场采集的样本,结合MINIST数据集,建立起包含手写体和数码管的混合数据集;然后,考虑更好的鲁棒性,提出一种改进的CNN,并用上述混合数据集对其训练,实现了一个网络识别多类型数字;最后,训练好的神经网络模型被成功应用于RoboMaster机甲大赛的多源数字识别场景中。测试结果表明,所提算法整体识别准确率稳定且较高,具有较好的鲁棒性和泛化能力。     

基于BP神经网络的手写体数字识别

手写体数字识别是多年来的研究热点,也是字符识别中的一个特别问题。由于手写体数字字体变化很大,传统的识别方法很难达到高的识别率。针对传统的数字识别方法的复杂性和局限性,提出了一种基于BP神经网络的手写体数字的识别方法。该方法在提取手写体数字点特征、笔划密度特征基础上,利用改进的BP神经网络进行训练识别。经实验,识别率达94％。实验结果表明,该方法对手写体数字识别效果良好,不仅简化了传统识别的繁杂性,而且提高了识别的准确性。     

Optical character recognition in real environments using neural networks and k-nearest neighbor

In this paper, we propose a novel process to optical character recognition (OCR) used in real environments, such as gas-meters and electricity-meters, where the quantity of noise is sometimes as large as the quantity of good signal. Our method combines two algorithms an artificial neural network on one hand, and the k-nearest neighbor as the confirmation algorithm. Our approach, unlike other OCR systems, it is based on the angles of the digits rather than on pixels. Some of the advantages of the proposed system are: insensitivity to the possible rotations of the digits, the possibility to work in different light and exposure conditions, the ability to deduct and use heuristics for character recognition. The experimental results point out that our method with moderate level of training epochs can produce a high accuracy of 99.3 % in recognizing the digits, proving that our system is very successful.     

Farsi/Arabic handwritten digit recognition based on ensemble of SVD classifiers and reliable multi-phase PSO combination rule

The problem of handwritten digit recognition has long been an open problem in the field of pattern classification and of great importance in industry. The heart of the problem lies within the ability to design an efficient algorithm that can recognize digits written and submitted by users via a tablet, scanner, and other digital devices. From an engineering point of view, it is desirable to achieve a good performance within limited resources. To this end, we have developed a new approach for handwritten digit recognition that uses a small number of patterns for training phase. To improve the overall performance achieved in classification task, the literature suggests combining the decision of multiple classifiers rather than using the output of the best classifier in the ensemble; so, in this new approach, an ensemble of classifiers is used for the recognition of handwritten digit. The classifiers used in proposed system are based on singular value decomposition (SVD) algorithm. The experimental results and the literature show that the SVD algorithm is suitable for solving sparse matrices such as handwritten digit. The decisions obtained by SVD classifiers are combined by a novel proposed combination rule which we named reliable multi-phase particle swarm optimization. We call the method “Reliable” because we have introduced a novel reliability parameter which is applied to tackle the problem of PSO being trapped in local minima. In comparison with previous methods, one of the significant advantages of the proposed method is that it is not sensitive to the size of training set. Unlike other methods, the proposed method uses just 15 % of the dataset as a training set, while other methods usually use (60–75) % of the whole dataset as the training set. To evaluate the proposed method, we tested our algorithm on Farsi/Arabic handwritten digit dataset. What makes the recognition of the handwritten Farsi/Arabic digits more challenging is that some of the digits can be legally written in different shapes. Therefore, 6000 hard samples (600 samples per class) are chosen by K-nearest neighbor algorithm from the HODA dataset which is a standard Farsi/Arabic digit dataset. Experimental results have shown that the proposed method is fast, accurate, and robust against the local minima of PSO. Finally, the proposed method is compared with state of the art methods and some ensemble classifier based on MLP, RBF, and ANFIS with various combination rules.     

结合时空拓扑特征和稀疏表达的人体行为识别算法

基于视觉的行为分析是图像处理、模式识别等领域重要研究内容之一,在公共安全和军事上有广泛前景。在固定单摄像机下,针对单特征描述力欠缺、运动遮挡、空洞和阴影等问题,提出一种结合时空拓扑特征和稀疏表达的行为识别算法。该算法利用随机投影融合拓扑结构、几何不变特征和时空Poisson信息构造强内聚高区分低维的时空拓扑特征,结合模拟人脑解决问题的加噪稀疏机制,识别近景人体行为。实验结果表明时空拓扑特征比单特征的识别率高12.79%,在噪声情况下识别率仅降低6.15%,多行为识别率达到87.78%;该算法具有较强的时空特征描述力、噪声鲁棒性和识别高效性。     

一种数字仪表显示值快速识别方法

提出了一种数字仪表显示值的快速识别方法。该方法首先由计算机自动定位分割图像中的数字区域并实现单个数字的切分,然后对每个数字图像提取了一组具有较高区分度且计算简单的典型特征,最后,基于模糊识别的最大隶属原则,构造了一种数字识别器,实现了仪表显示值的实时识别。试验表明:该方法的识别率高达99%,对7位数字的识别时间不超过20毫秒,并且具有较强的抗干扰能力,达到了仪表显示值识别的速度和准确率要求。     

组合结构特征的自由手写体数字识别算法研究

自由手写体因其书写风格差异大、上下文无关及识别准确度要求高等原因导致其识别难度大的问题。针对手写体数字识别的特点及要求,提出一种新的基于组合结构特征的自由手写体数字识别算法。通过扩展的字符结构特征识别算法自动、鲁棒地提取手写体数字字符端点、分叉点、横线等多种结构特征,并组合应用这些结构特征构造决策树完成手写体字符的自动识别。实验结果表明基于组合结构特征的自由手写体数字识别算法的鲁棒性和识别率明显优于传统方法。     

A novel cascade ensemble classifier system with a high recognition performance on handwritten digits

This paper presents a novel cascade ensemble classifier system for the recognition of handwritten digits. This new system aims at attaining a very high recognition rate and a very high reliability at the same time, in other words, achieving an excellent recognition performance of handwritten digits. The trade-offs among recognition, error, and rejection rates of the new recognition system are analyzed. Three solutions are proposed: (i) extracting more discriminative features to attain a high recognition rate, (ii) using ensemble classifiers to suppress the error rate and (iii) employing a novel cascade system to enhance the recognition rate and to reduce the rejection rate. Based on these strategies, seven sets of discriminative features and three sets of random hybrid features are extracted and used in the different layers of the cascade recognition system. The novel gating networks (GNs) are used to congregate the confidence values of three parallel artificial neural networks (ANNs) classifiers. The weights of the GNs are trained by the genetic algorithms (GAs) to achieve the overall optimal performance. Experiments conducted on the MNIST handwritten numeral database are shown with encouraging results: a high reliability of 99.96% with minimal rejection, or a 99.59% correct recognition rate without rejection in the last cascade layer.     

基于SVM的手写体数字快速识别方法研究

手写体数字识别是图像处理与模式识别中具有较高实用价值的研究热点之一。在保证较高识别精度的前提下,为提高手写体数字的识别速度,提出了一种基于SVM的快速手写体数字识别方法。该方法通过各类别在特征空间中的可分性强度确定SVM最优核参数,快速训练出SVM分类器对手写体数字进行分类识别。由于可分性强度的计算是一个简单的迭代过程,所需时间远小于传统参数优化方法中训练相应SVM分类器所需时间,故参数确定时间被大大缩减,训练速度得到相应提高,从而加快了手写体数字的识别过程,同时保证了较好的分类准确率。通过对MNIST手写体数字库的实验验证,结果表明该算法是可行有效的。