一个简单高效的动态手势识别方法

文章首先给出了基于角度的动力学模型及其特征值,并提出了基于SCG神经网络的静态特征值识别算法和基于模板匹配的动态特征值识别算法。使用该文提出的动态时间规整算法和手势分割算法建立的动态手势识别系统,实践证明具有较好的实时性和识别率。     

基于分位数的手写汉字识别方法

以往的手写汉字识别方法,无论应用何种特征提取方法,在生成标准模板时,一般都采用样本特征的算术平均值。文章提出了一种使用样本特征的分位数组合生成标准模板的方法,通过其在手写汉字识别中的应用表明,该方法比基于均值的标准模板有更好的鲁棒性,且在不增加任何计算量和算法复杂度的前提下,使系统的识别性能有所提高;同时该算法还有很好的推广性能,可以应用到各种特征提取算法中。     

On-line signature recognition based on VQ-DTW

This paper studies some pattern recognition algorithms for on-line signature recognition: vector quantization (VQ), nearest neighbor (NN), dynamic time warping (DTW) and hidden Markov models (HMM). We have used a database of 330 users which includes 25 skilled forgeries performed by five different impostors. This database is larger than the typical ones found in the literature.Experimental results reveal that our first proposed combination of VQ and DTW (by means of score fusion) outperforms the other algorithms (DTW, HMM) and achieves a minimum detection cost function (DCF) value equal to 1.37% for random forgeries and 5.42% for skilled forgeries. In addition, we present another combined DTW-VQ scheme which enables improvement of privacy for remote authentication systems, avoiding the submission of the whole original dynamical signature information (using codewords, instead of feature vectors). This system achieves similar performance than DTW.     

手写中文速记符中音符的动态规划识别方法

本文在分析英文速记识别技术以及中文速记特点的基础上，提出了中文速记符的自动识别策略，并且以“人群速记”体系为研究对象，详细描述了用于识别速记符中297个音符的动态规划识别过程。通过采用局部平滑预处理，以及基于速记符形状特征和结构特征的粗分类措施，大大提高了动态规划识别速度和正确识别率。初步实验表明，对特定人书写的297个人群速记音符用动态规划法进行识别，正确识别率能达到93％以上。     

一种复杂场景下建筑目标识别方法

提出了一种基于建筑目标的竖直线特征寻找图像中存在建筑目标区域的方法;考虑了目标特征的相互关系,给出了一种新的模板匹配算法。实验表明：利用该文提出的算法建立的识别系统与其它识别系统相比,大大减少了运算时间,有较好的抗噪声干扰和处理目标被遮挡问题的能力。     

A Neural Network Approach to Planar-Object Recognition in 3D Space

Most existing 2D object recognition algorithms are not perspective (or projective) invariant, and hence are not suitable for many real-world applications. By contrast, one of the primary goals of this research is to develop a flat object matching system that can identify and localise an object, even when seen from different viewpoints in 3D space. In addition, we also strive to achieve good scale invariance and robustness against partial occlusion as in any practical 2D object recognition system. The proposed system uses multi-view model representations and objects are recognised by self-organised dynamic link matching. The merit of this approach is that it offers a compact framework for concurrent assessments of multiple match hypotheses by promoting competitions and/or co-operations among several local mappings of model and test image feature correspondences. Our experiments show that the system is very successful in recognising object to perspective distortion, even in rather cluttered scenes. Receiveed: 29 May 1998?,Received in revised form: 12 October 1998?Accepted: 26 October 1998     

A New Hybrid Approach to Handwritten Address Verification

The use of optical character recognition (OCR) has achieved considerable success in the sorting of machine-printed mail. The automatic reading of unconstrained handwritten addresses however, is less successful. This is due to the high error rate caused by the wide variability of handwriting styles and writing implements. This paper describes a strategy for automatic handwritten address reading which integrates a postcode recognition system with a hybrid verification stage. The hybrid verification system seeks to reduce the error rate by correlating the postcode against features extracted and words recognised from the remainder of the handwritten address. Novel use of syntactic features extracted from words has resulted in a significant reduction in the error rate while keeping the recognition rate high. Experimental results on a testset of 1,071 typical Singapore addresses showed a significant improvements from 24.0% error rate, 71.2% correct recognition rate, and 4.8% rejection rate using raw OCR postcode recognition to 0.4% error rate, 65.1% correct recognition rate, and 34.5% rejection rate using the hybrid verification approach. The performance of the approach compares favourably with the currently installed commercial system at Singapore Post, which achieved 0.7% error rate, 47.8% correct recognition rate, and 51.5% rejection rate for 6-digit postcode using the same test data.     

用LPC及DTW进行语音模式比较的设计与实现

阐述了提取LPC特征参数和DTW模式匹配基本原理,并进一步实现了求解LPC的杜宾算法和有效进行DTW的一个算法。在此基础上,根据英语学习的实际需要,设计并实现了一个语音模式比较实例。     

虹膜识别中噪声的检测和处理方法

针对虹膜识别中存在的问题,在识别时应该尽可能将虹膜有效信息提取出来,而将眼皮、睫毛、光点的反射等去除,同时在特征提取中,提出了通过噪卢扩展方法消除噪声信号在编码过程中带来的影响。实验结果表明该文提出的方法有助于提高识别的可靠性和模式分类能力。     

脱机手写字符识别的DP算法的设计

把手写体汉字识别视为一种允许空间偏移的弹性模式识别匹配问题，提出了一种用于这类二值图象的两层动态规划算法，初步实验表明该算法具有十分满意的识别效果。     

基于最大熵模型的汉语词义消歧与标注方法

分析最大熵模型开源代码的原理和各参数的意义,采用频次和平均互信息相结合特征筛选和过滤方法,用Delphi语者编程实现汉语词义消歧的最大熵模型,运用GIS（Generalized Iterative Scaling）算法计算模型的参数。结合一些语占知识规则解决训练语料的数据稀疏问题,所实现的汉语词义消歧与标注系统,对800多个多义词进行词义标注,取得了较好的标注正确率。     

一种基于小波变换提取拐点的手写签名认证方法

为了对手写签名进行准确认证 ,介绍了一种基于小波变换的用于提取手写签名笔划坐标 -时间曲线拐点的手写签名认证方法 ,该方法首先采用以高斯函数的二阶导数作为小波基的小波变换技术来进行拐点提取 ,由于变换后的曲线可以近似认为是原函数的二次导数曲线 ,它不仅能够从签名笔划曲线中准确可靠地提取出具有特殊意义的拐点 ,并具有分辨尺度可调的优点 ,从而提高了认证的普适性 ;然后以该方法为基础 ,进行不同签名之间拐点序列的匹配 ;最后再利用提取的拐点来对签名进行分段和段 -段对应处理 .若由于利用拐点分段能体现出各分段局部相似性与稳定性不同的特点 ,因而拉开了真伪签名之间的差距 ,若进一步与动态时间弯曲算法相结合 ,即可取得比较满意的认证效果 .     

Scaling and time warping in time series querying

The last few years have seen an increasing understanding that dynamic time warping (DTW), a technique that allows local flexibility in aligning time series, is superior to the ubiquitous Euclidean distance for time series classification, clustering, and indexing. More recently, it has been shown that for some problems, uniform scaling (US), a technique that allows global scaling of time series, may just be as important for some problems. In this work, we note that for many real world problems, it is necessary to combine both DTW and US to achieve meaningful results. This is particularly true in domains where we must account for the natural variability of human actions, including biometrics, query by humming, motion-capture/animation, and handwriting recognition. We introduce the first technique which can handle both DTW and US simultaneously, our techniques involve search pruning by means of a lower bounding technique and multi-dimensional indexing to speed up the search. We demonstrate the utility and effectiveness of our method on a wide range of problems in industry, medicine, and entertainment.     

Word 文档中AutoCAD 数据格式图形显示效果的高效编辑研究

在分析现有的插图制作方法和AutoCAD 软件图形显示原理的基础上,按照试错法 研究了Word 文档中AutoCAD 数据格式图形在编辑过程中显示效果失控的现象。研究表明, AutoCAD 软件绘图窗口的大小和视图状态信息是决定文档插图显示效果的最重要因素。在编辑文 档插图时,诸如使用全部视图信息的方法制作插图、在AutoCAD 软件工作界面最大化的显示状 态下编辑图形、及时恢复到原始的视图状态、每次编辑插图时保持软硬件操作环境不变等措施, 就能使插图的显示效果在编辑过程中始终处于可控的状态,从而显著提高编辑效率。     

How many reference patterns can improve profitability for real-time trading in futures market?

Investors in futures market used to employ trading system which depends on reference pattern (template) to detect real-time buy or sell signal from the market. Indeed they prepare in advance a number of reference patterns that market movement might follow, and then match the current market with one of reference patterns. One popular way to prepare templates is to fix a relatively small number of them which represent possible market movements efficiently. The underlying assumption of this approach is of course that the current market movement is close enough to one of the templates. However, there is always a calculated risk that the current market is close to none of them sufficiently. In this article we investigate the issue of appropriate number of templates (or template cardinality I) in terms of profitability. We will show that one may improve profitability by increasing I and that random pattern sampling plays a key role in such case. An empirical study is done on the Korean futures market.     

一种实用的资源稀缺条件下的分词方法

在一些使用人数较少的语言中,缺少人工标注语料,研究在资源稀缺条件下的分词方法成了亟待解决的问题。本文研究了无监督的VE算法,以及最大匹配间隔标注算法,在此基础之上提出一种无监督分词方法与最大匹配方法相结合的分词方法,并在汉语语料上进行实验。该分词方法显著提高了最大匹配分词方法的分词效果,同时也优于当前最好的无监督分词结果。实验表明,该方法快速、有效,利用较小的资源获得了较好的分词效果。     

一种手写体汉字特征提取新方法—小波变换及弹性网络技术的应用

利用小波分析方法将汉字图象分解为横、撇、竖、捺４个方向的分量，然后结合弹性网络技术，提出了进行了手写体汉字特征提取的一种新方法，实验结果显示此方法是行之有效的。     

一种利用Hausdorff距离的高效目标搜索算法

为了快速高效地进行目标搜索，提出了一种在仿射变换条件下，利用Hausdroff距离进行目标搜索的高效算法。此算法是在一种新的距离变换形式——“最小正方盒距离变换”的基础上进行的。实验结果表明，与现有算法相比，该算法在不影响搜索成功率和目标定位精度的情况下，还可以显著地缩短搜索时间。为验证该算法的有效性，将该算法与Rucklidge算法进行了对比实验，结果表明，该算法明显优于Rucklidge提出的快速目标搜索算法。