Quantitative Analysis Of Dynamic Characteristics Of Signature Under Different Conditions

The completion of writing activity depends on certain writing conditions.Under unfavorable conditions,the writer's handwriting may be disturbed or hindered,resulting in changes in handwriting.Based on the characteristics of few words and limited features of signature,how to determine whether the signature difference is caused by non-essential difference or essential difference caused by the change of conditions has always been the difficulty of handwriting identification.Quantitative research on dynamic features will help us dig out more hidden information from signatures,provide a new way of thinking and support for traditional handwriting testing,help to overcome the difficulties,and improve the objectivity and scientific nature of signature identification.This paper is combined with the national natural science foundation of China(U1736102,61605132)and the public welfare research fund of central scientific research institutes(GY2019D-1).The main research methods refer to the above subject,and it is a new application exploration of the existing methods.Taking the off-line signature handwriting as the research object,mainly through the 3D shape contour measuring instrument,scanning the off-line signature 3D image and related dynamic feature data,and using the computer image processing technology andstatistical analysis methods,to explore the dynamic characteristics of the signature in different writing conditions of the change of the law,and try to use the dynamic characteristics of the initial difference between conditional changes and copying handwriting.Through the method of experimental research,we concluded as follows:(1)In terms of width features: the changes of signature stroke width of the same writer are generally similar under the same and different writing conditions,reflecting the writer's inherent writing habits;With the change of writing conditions,the stability of the overall width and width of the signature will be affected to some extent,but the overall width of the signature under each condition is obviously distinguished.There are obvious differences in the variation of the width curve and the average width between the facsimile signature and the copy signature.(2)In terms of radian features:changes in radian of signature strokes are generally similar for the same writer under the same writing condition and under different writing conditions;The change of writing conditions has little effect on the stability of the whole radian and radian features,and is not significantly different from that of the copy signature.(3)In terms of grayscale features: the variation of the signature of the same writer under various conditions is similar,but it has stronger diversity and randomness compared with the width features;The change of writing conditions will affect the stability of the signature's overall grayscale and grayscale characteristics,but there is still a clear distinction between the signature's overall grayscale under each condition.There are obvious differences in the variation of grayscale curve and the average grayscale between facsimile signature and copy signature.