Forensic Application Of Micro-area Transmission/Reflection Spectroscopy (TS/RS) Measurement System In Hand-written Strokes Sequence Identification

Handwriting identification is an important judicial identification technology,which has a wide range of applications in both criminal cases and civil cases.This article introduces a new type of document inspection method based on the micro-region transmission / reflection spectroscopy measurement system.This method mainly analyzes the stroke crossing timing in suspicious documents.This measurement method can provide corresponding identification basis for the stroke writing timing relationship by observing the overlapping parts of the writing strokes with transmission light microscope and high-precision spectral measurement.The micro-region transmission / reflection spectroscopy measurement system is a spectroscopic technology measurement method for non-destructive specimens.The system irradiates a beam of light onto the surface of the specimen.By detecting the changes of reflected or transmitted light,it can accurately measure the small changes on the surface of the specimen and draw them into atlas to present them.Through the analysis of the morphological characteristics of the spectral curve and the detailed observation of the specimen part under the transmission light microscope,it provides an identification basis for the stroke writing timing.This article is divided into four chapters.The first chapter mainly introduces the principal outline of the micro-region transmission / reflection spectroscopy measurement system,mainly including the technical principle of the equipment,the applicability of the equipment in handwriting identification,and the characteristics and advantages of the equipment.The second chapter describes the progress of this experiment in detail,including the preliminary preparation of the experiment,the construction method of the experimental equipment,the specific operation process of the experiment,and the conclusions obtained from the experiment.The experiment used pens of different colors and different brands to overlap the strokes.Write,and observe and analyze it through the micro-area transmission / reflection spectroscopy measurement system.The operation process of this experiment is divided into two parts.One part is to observe and analyze the overlapping parts of each stroke with a transmission light microscope,and the other part is to perform micro-area reflection spectroscopy measurement and analysis on the overlapping parts of the strokes.And the conclusions obtained from the analysis are combed and summarized in the experimental conclusion part.The third chapter is to use the conclusions and method system obtained in this experiment to carry out simulation verification,that is,to carry out specific case inspection practice on the framework system constructed by this experiment,so as to summarize the application rate and limitations of this method.The fourth chapter is the summary and prospect of the full text and analyzes the prospects and future prospects of the micro-region transmission / reflection spectroscopy measurement system,so as to promote the application scope of new science and technology in the field of document inspection.The main conclusions obtained in this paper are: When observing with a transmission light microscope,different conclusions are obtained from the observation of different color pens.Due to the extremely similar ink color between the black gel pen and the red pen,and the small difference in the composition of the pigment,it is almost impossible to observe the characteristic difference of the stroke writing sequence by using a transmission microscope.The stroke overlap between the black gel pen and the black water pen or the black oil pen,and the black pen and the blue pen or the red pen can be observed to obtain obvious writing timing characteristics.The overlap of strokes between black water-based pens and oily pens,between black oily pens,and between blue pens and inks all show a more ambiguous state,and the appraiser needs to rely on his experience to identify feature points.When using the micro-region reflection spectroscopy measurement system for analysis,most of the black neutral pens and all other pens have achieved good feedback when performing stroke overlap timing detection,but a large part of the spectrum measured between the rest of the pens cannot obtain feature points that can determine their writing timing.Although the micro-region transmission / reflection spectroscopy measurement system is feasible and has high precision in stroke overlap timing identification,it still has some limitations.In the future,the detection light source and data analysis algorithm of the system can be improved and optimized to further improve its scope of application,accuracy and stability,and provide a new high-precision identification technology for the field of document inspection and judicial identification.