中文签名笔迹动态特征研究

从物理学角度看,笔迹是书写工具在力的作用下在载体上形成的运动轨迹.作用力和速度的大小和变化构成了书写运动的动态特征.本文以签名笔迹为对象,研究签名笔迹的动态特征及其属性.实验结果表明动态特征能够作为认定书写人,鉴别摹仿签名的重要依据.     

中文签名笔迹动态特征研究

从物理学角度看,笔迹是书写工具在力的作用下在载体上形成的运动轨迹.作用力和速度的大小和变化构成了书写运动的动态特征.本文以签名笔迹为对象,研究签名笔迹的动态特征及其属性.实验结果表明:动态特征能够作为认定书写人,鉴别摹仿签名的重要依据.     

中文签名笔迹动态特征研究

从物理学角度看,笔迹是书写工具在力的作用下在载体上形成的运动轨迹。作用力和速度的大小和变化构成了书写运动的动态特征。本文以签名笔迹为对象,研究签名笔迹的动态特征及其属性。实验结果表明：动态特征能够作为认定书写人,鉴别摹仿签名的重要依据。     

中文签名笔迹动态特征研究

从物理学角度看,笔迹是书写工具在力的作用下在载体上形成的运动轨迹.作用力和速度的大小和变化构成了书写运动的动态特征.本文以签名笔迹为对象,研究签名笔迹的动态特征及其属性.实验结果表明:动态特征能够作为认定书写人,鉴别摹仿签名的重要依据.     

签名笔迹动态特征的理论研究

本文以签名笔迹为研究对象,提取书写过程中的动态特征,在此基础上,对签名笔迹动态特征的概念和属性进行了深入的探讨,构建了一套较为完整的签名笔迹动态特征的理论系统。     

浅谈签名笔迹的独特特征

签名,是指享有某些权利或应尽有关义务的个人在有关文件上签署自己的姓名所形成的文字。签名和印文一起构成了文件及其所载内容的真实性和有效性的凭证。本文拟就签名笔迹独特特征的形成、表现形式以及对签名笔迹独特特征的寻找与运用做一些初步探讨。一、签名笔迹独特特征的形成本文所说的签名笔迹独特特征,是指非摹仿性的本质性的自然形成的独特的书写习惯的反映。签名笔迹的独特特征形成的因素很多,概括起来有以下几点:(一)心理因素;(二)生理因素;(三)审美观念和书写艺术素质不同的影响;(四)执笔方法不同的影响;(五)书写工具不同的影响。…     

签名笔迹及其检验研究

签名笔迹检验一直是文件检验中的难点,案件涉及比例居高,并呈上升之势。此类字迹,字符特征少,书写习惯反应不充分,检验难度大。因此,通过对签名笔迹主要类型、特点、检验方法等相关问题的探究,来增强对签名笔迹的认识以及提高签名笔迹检验的实践能力,意义重大。     

签名笔迹笔压特征显现方法的比较研究

目的 通过研究抽取笔压特征的方法为签名笔迹鉴定提供有效的检验手段.方法 为了将笔压特征脱离其他特征而突显出来,通过实验考察了多种显现方法,包括体视显微镜侧光观察法、侧光红外影像法、静电压痕显现法、显微图像三维重建法和激光共聚焦扫描显微镜法.结果 比较多种方法所获得的显现结果,实验表明五种方法在展现笔压特征上各有优缺点.结论 笔迹鉴定人员应该充分利用可获得的多种手段分析笔压特征,来提高签名笔迹鉴定意见的可靠性.     

论摹仿签名笔迹鉴定

摹仿签名笔迹鉴定是实践中较为经常遇到的鉴定工作。它具有字数少、仿真度高、隐蔽性强等特点。因此对摹仿签名笔迹的鉴定应依照其自身的特点而进行,遵循一定立足整体、着眼细节、符合和差异兼顾等原则进行。     

伪造签名笔迹检验的研究

对伪造签名笔迹的研究,揭示窃取、复制他人亲笔签名伪造文件的手法及其特点,是检验伪造签名笔迹的有效方法。     

笔迹特征的统计分析

目的探讨笔迹鉴定的客观标准。方法采用统计分析的方法对笔迹特征的性质、种类极其鉴定价值进行研究,对笔迹特征进行分类。结果探讨了笔迹特征鉴定价值的规律。结论对笔迹鉴定的标准化研究具有一定的意义。     

专业性练习摹仿签名笔迹鉴定的实验研究

目的本文通过实验对具有一定笔迹鉴定专门知识与不具备笔迹鉴定专门知识的人的练习摹仿签名笔迹进行实验分析研究。方法对两类人在练习的不同阶段形成的练习摹仿签名笔迹特征的一般状态表现,以及对其笔迹特征的形成、变化原因、鉴定价值分别进行了论述,并总结出其变化规律。结果为不同种类的练习摹仿签名笔迹的鉴定提供一定的识别和特征分析、评断的参考依据。     

Color separation of signature and stamp inks to facilitate handwriting examination

The questioned documents laboratory often encounters cases where handwriting that is to be examined intersects with some interfering factor such as a rubber stamp, typewriting or background printing. In these cases, line direction, beginning and ending features of letters and other fine details of the handwriting may be lost in the "noise" of the intersecting ink. The purpose of this paper is to show several new digital photography methods that may be used to "subtract" the effect of the intersecting ink, thereby enhancing that of the handwriting ink in order to enable the document examiner to conduct a complete examination. These methods have the advantage of being fast and do not involve the use of expensive material or equipment. Several new methods are described that may be used to separate the colors of the handwriting ink from that of the intersecting ink: the analog method and several digital methods such as RGB-HSB-CMYK, L*a*b color, and color separation using the Channel Mixer function of Adobe Photoshop. Successful application of these color separation methods to specific handwriting ink/rubber stamp ink color combinations shows that the effect of the intersecting ink may indeed be minimalized if not canceled altogether. Application of the suggested methods may well make the difference between a nonconclusive handwriting examination and a full analysis of the questioned handwriting.     

中文笔迹性别差异的研究

目的考察中文笔迹的性别差异。方法采用中文笔迹测验材料对236名大学生的书写样本进行了测量,并对笔迹特征进行了统计分析。结果男性的书写水平低于女性,男性书写速度比女性快,男性笔迹较潦草,轻重疾徐的节奏感较弱;男性书写时所留页边比女性小;男性笔迹的连笔比女性多,转折角度比女性大;男性笔迹的字行间距大于女性。     

Forensic examination of effects of Parkinsonism on various handwriting characteristics

Parkinsonism is a neurodegenerative syndrome that causes impairment of motor skills in affected persons. Thus, adverse effects may be produced in the handwriting of persons suffering from Parkinsonism. Medication used for the treatment of Parkinsonism is known to subside certain motor defects for specific time intervals, showing slight differences or improvement in certain handwriting characteristics during those intervals on the same day as compared to the ones executed before medication. Certain handwriting characteristics affected due to Parkinsonism may be mistaken as forged features due to poor line quality, which can cause suspicion upon the authenticity of important legal documents. The present research work has been carried out to determine the effects of Parkinsonism and medication used for its treatment on handwriting. Handwriting/signature samples executed before and after the onset of Parkinsonism (both pre- and post-medication) have been randomly collected from 70 participants. These handwritings have been evaluated separately and compared inter-se for various handwriting characteristics with qualitative and statistical approach. The results have demonstrated significant changes in most of the characteristics in both affected writings of majority of participants as compared to their corresponding earlier writings. Thus, forensic document experts should be aware of the detrimental effects of Parkinsonism on handwriting in pre- and post-medication conditions of this ailment.     

On the discriminability of the handwriting of twins

As handwriting is influenced by physiology, training, and other behavioral factors, a study of the handwriting of twins can shed light on the individuality of handwriting. This paper describes the methodology and results of such a study where handwriting samples of twins were compared by an automatic handwriting verification system. The results complement that of a previous study where a diverse population was used. The present study involves samples of 206 pairs of twins, where each sample consisted of a page of handwriting. The verification task was to determine whether two half-page documents (where the original samples were divided into upper and lower halves) were written by the same individual. For twins there were 1236 verification cases -- including 824 tests where the textual content of writing was different, and 412 tests where it was the same. An additional set of 1648 test cases were obtained from handwriting samples of nontwins (general population). To make the handwriting comparison, the system computed macro features (overall pictorial attributes), micro features (characteristics of individual letters), and style features (characteristics of whole-word shapes and letter pairs). Four testing scenarios were evaluated: twins and nontwins writing the same text and writing different texts. Results of the verification tests show that the handwriting of twins is less discriminable than that of nontwins: an overall error rate of 12.91% for twins and 3.7% for nontwins. Error rates with identical twins were higher than with fraternal twins. Error rates in all cases can be arbitrarily reduced by rejecting (not making a decision on) borderline cases. A level of confidence in the results obtained is given by the fact that system error rates are comparable to that of humans (lower than that of lay persons and higher than that of questioned document examiners [QDEs]).     

Practical aspects of the Mengele handwriting examination

The examination of the evidence in the Mengele case posed several problems not normally encountered in the routine document case. The publicity, the media coverage, the age of the documents, and the physical surroundings all required attention so that a successful conclusion could be reached.