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本文提出了对道路标志进行快速别的一种辅助系统,该系统以人类的视觉及思维模式作为蓝本,可以较为快速的实现行进汽车中的交通标志识别。这一系统通过安装在汽车上的摄像机获取信息,通过子采样消除图像重影同时减少需要处理的数据量,然后根据交通标志的色彩和形状两方面特征,寻找画面帧中的交通标志,采用模板匹配的方法实现标志的定位和最终识别。 相似文献
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We describe a process of word recognition that has high tolerance for poor image quality, tunability to the lexical content
of the documents to which it is applied, and high speed of operation. This process relies on the transformation of text images
into character shape codes, and on special lexica that contain information on the shape of words. We rely on the structure
of English and the high efficiency of mapping between shape codes and the characters in the words. Remaining ambiguity is
reduced by template matching using exemplars derived from surrounding text, taking advantage of the local consistency of font,
face and size as well as image quality. This paper describes the effects of lexical content, structure and processing on the
performance of a word recognition engine. Word recognition performance is shown to be enhanced by the application of an appropriate
lexicon. Recognition speed is shown to be essentially independent of the details of lexical content provided the intersection
of the occurrences of words in the document and the lexicon is high. Word recognition accuracy is dependent on both intersection
and specificity of the lexicon.
Received May 1, 1998 / Revised October 20, 1998 相似文献
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Dey Sounak Nicolaou Anguelos Lladós Josep Pal Umapada 《International Journal on Document Analysis and Recognition》2019,22(4):361-374
International Journal on Document Analysis and Recognition (IJDAR) - Word spotting is an important recognition task in large-scale retrieval of document collections. In most of the cases, methods... 相似文献
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在语音识别和合成中文本分析是很重要的,文本分词是文本分析正确与否的基础。目前语音合成系统中的分词一般是基于词典分析建立的,对于多音字易产生错误。文章基于数据挖掘中的关联规则的发现方法对文本分词中词语的关联关系进行研究,通过文本数据的文本特征及语音特征描述的有机结合,获取词语自身属性的关联关系,最后进行了实例测评。 相似文献
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车牌识别是现代智能交通系统中的重要组成部分之一,其应用范围十分广泛。对车牌定位方法进行了初步研究,以模式识别、数字图像处理、计算机视觉技术为基础,使用M atlab软件对图像预处理、边缘检测等算法进行了必要的仿真实验,获取了车牌区域。对摄像机拍摄车辆的图像进行分析处理可以得到汽车的车牌号码,从而完成整个识别过程。 相似文献
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多文种环境下汉字内码识别算法的研究 总被引:9,自引:4,他引:9
汉字内码向ISO/IEC 10646过渡是实现计算机用文字编码统一的必然趋势,但目前在一段时间内仍将存在多种汉字内码并存的情况,所以实现汉字内码的自动识别是保证汉字多内码并存的关键。本文主要探讨了如何在多内码并存的多文种环境中实现汉字内码自动识别的问题,并提供了多种汉字内码识别算法,包括基于内码分布、标点符号特征、字频特征和语义特征的识别算法等。在此基础上,本文对不同的识别算法进行分析和评估。在对目标样本的测试中,以上算法的识别率最高可以达到99.9%以上。 相似文献
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In this paper the results of the research in handwriting/handwritten character recognition in about the last quarter of a century are reported, illustrating the results presented during the International Workshop on Frontiers in Handwriting Recognition (IWFHR) and the International Conference on Frontiers in Handwriting Recognition (ICFHR). 相似文献
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Sabeur Masmoudi Mondher Frikha Mohamed Chtourou Ahmed Ben Hamida 《International Journal of Speech Technology》2011,14(1):1-10
This paper describes an efficient constructive training algorithm using a Multi Layer Perceptron (MLP) neural network dedicated
for Isolated Word Recognition (IWR) systems. Incremental training procedure was employed and this approach was based on novel
hidden neurons recruiting for a single hidden-layer. During Neural Network (NN) training phase, the number of pronunciation
samples extracted from the Training Data (TD) was sequentially increased. Optimal structure of the NN classifier with optimized
TD size was obtained using this proposed MLP constructive training algorithm. 相似文献
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A review on Gabor wavelets for face recognition 总被引:6,自引:2,他引:6
Due to the robustness of Gabor features against local distortions caused by variance of illumination, expression and pose, they have been successfully applied for face recognition. The Facial Recognition Technology (FERET) evaluation and the recent Face Verification Competition (FVC2004) have seen the top performance of Gabor feature based methods. This paper aims to give a detailed survey of state of the art 2D face recognition algorithms using Gabor wavelets for feature extraction. Existing problems are covered and possible solutions are suggested. 相似文献
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复述(Paraphrase)句的识别可看作文本蕴含(Text Entailment)识别的一个子问题,传统的解决方法是通过词频或句法上的相似度来判断。即使用相同的文字书写的句子其含义也可能差别很大,而相同句法结构也不能保证意义一致。该文根据新闻语料的特点,提出了一种通过引入深层的语义角色标注来帮助识别新闻领域复述句的方法。该方法通过在语义角色这种结构化的含义表达形式中提取的特征来弥补传统方法的不足 先识别待判断的两个句子中所有谓词的语义角色,然后计算两个句子间对应语义角色的相似度,最后结合传统的句子相似度计算方法来进行相似性计算。实验证明,该文提出的方法能有效地提高复述语句的识别效果。 相似文献
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机器视觉测量系统在工业在线检测中的应用 总被引:14,自引:0,他引:14
机器视觉测量用视觉传感器采集目标图像,通过对图像各种特征量的分析处理,获取被测曲面信息.设计了一机器视觉测量系统,识别一幅图像中是否存在确定大小和形状子图像,若有则识别出它的位置.介绍如何利用“模板匹配”法对目标图像进行识别,并举例如何利用系统检测药片的包装是否合格(有无漏装). 相似文献
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Jinchao Yang Xiang Zhang Hongbin Suo Li Lu Jianping Zhang Yonghong Yan 《Expert systems with applications》2012,39(4):4287-4291
This paper proposes the use of Maximum A Posteriori Linear Regression (MAPLR) transforms as feature for language recognition. Rather than estimating the transforms using maximum likelihood linear regression (MLLR), MAPLR inserts the priori information of the transforms in the estimation process using maximum a posteriori (MAP) as the estimation criterion to drive the transforms. By multi MAPLR adaptation each language spoken utterance is convert to one discriminative transform supervector consist of one target language transform vector and other non-target transform vectors. SVM classifiers are employed to model the discriminative MAPLR transform supervector. This system can achieve performance comparable to that obtained with state-of-the-art approaches and better than MLLR. Experiment results on 2007 NIST Language Recognition Evaluation (LRE) databases show that relative decline in EER of 4% and on mincost of 9% are obtained after the language recognition system using MAPLR instead of MLLR in 30-s tasks, and further improvement is gained combining with state-of-the-art systems. It leads to gains of 6% on EER and 11% on minDCF comparing with the performance of the only combination of the MMI system and the GMM-SVM system. 相似文献