The Applied Research On Morphological Characteristics In Time Test Of Colored Fingerprints

As an important way to prove the authenticity of the document,the identification of forming time of fingerprint has become prominent in judicial practice.In the context of the increasing number of inspection and identification requirements for the issues about formating time in criminal and civil cases,techniques to inspect forming time of fingerprint are faced with great challenge.In the traditional fingerprint formating time test,the physical and chemical methods are mainly used to analyze the physical and chemical properties of the e pigment of fingerprint and its changes.This method not only takes a long time,but also destroys the sample,and also has requires higher quality for the samples and inspection instrument.The morphological features of multiple fingerprints formed by one-time continuous stencil printing sometimes have strong specificity and good coherence.By analyzing the non-strand features of the fingerprint printing surface,it is possible to determine the fingerprint of the fingerprint and the specific time.The sample fingerprint is formed as a one-time stamping,which can clearly determine the actual stamping time of the fingerprint of the specimen.This method to help determining the formating time by fingerprinting morphological features is more economical and convenient.This paper analyzes the morphological characteristics of fingerprint printing,and studies the application value of fingerprint phase features in formating time test,in order to provide a valuable reference for fingerprint formating time test.This paper is divided into five parts.The first part is an overview of the time stamping test.It is clear that the time-testing of the document formation and the positioning and classification of the fingerprint formating time test can help to analyze the legal value of the fingerprint formating time in the proceedings.The second part is to analyze the physical and chemical methods of fingerprint printing time inspection.Firstly,the basic principles of various physical and chemical testing methods are explained.Secondly,comprehensive analysis of the advantages and disadvantages of the methods which are used in fingerprint printing forming time identification of using the Micro-Raman Spectroscopy,Infrared Spectrophotometry and other Spectroscopy as well as Thin-layer Chromatography,Gas-Mass Spectrometry and Document Examination Instrument.The third part is an overview of the morphological methods of fingerprinting time stamping.Firstly,the characteristics of fingerprint physiological structure are expounded from three aspects of specificity,stability and reflection,and the basic principle of fingerprint formating time test method is clarified.Secondly,from the variability,objective reflection and relative stability of fingerprint morphological features,the basis of the fingerprint morphological test method is analyzed.Finally,the morphological method of stamping time test is expounded,and the theoretical basis for the application of the fourth part is laid.The fourth part is to study the application of morphological characteristics in the time test of fingerprint printing.Firstly,statistical study was carried out on the application of the morphological characteristics of the ink distribution in the fingerprint printing time test.Through experiments,the characteristics of the fingerprint edge state,the fingerprint "ink accumulation" and "leakage" morphological features,the characteristics of the nail print mark,the positive angle of the fingerprint pattern,and the morphological characteristics of the fingerprint printing oil and its relationship with the fingerprint printing time are analyzed.Its stability was statistically analyzed.Secondly,the application of peeling and scar characteristics in the time test of fingerprint printing is analyzed.Finally,the application of the attachment features in the fingerprint inspection time test was analyzed.The fifth part summarizes the problems in the morphological characteristics in the fingerprint printing time test,and this part also puts forward new expectations for the further development of future technology.