Research On Stage Characteristics Of Visible Fingerprint

In the field of forensic identification,fingerprint identification is a kind of identification item to solve the formation of suspicious fingerprint in documents and whether it is pressed by the parties concerned.At present,due to the general lack of knowledge of fingerprints among the public or the dishonest intention of some parties,fingerprints with incomplete,overlapping and small areas often appear on the documents when they are pressed,as a result,the kinds and details of peeling fingerprints are difficult to play a decisive role in the fingerprint with low-definition lines,therefore,the study of the more subtle three-level features of fingerprints and the process of the formation of a specific print features for the identification of difficult fingerprints have a very important role.In the practice of identification,we usually use the fingerprint pattern features to identify the fingerprints,and exclude different fingerprints through different fingerprint patterns,on the basis of identifying the fingerprint pattern,the same identification is made by identifying the detailed features of the fingerprint,such as the starting point,the end point,the divergence,the combination,the dot,the stick,the hook,the eye and the bridge,the same conclusion can be drawn when the detailed features of the two fingerprints are in agreement with each other.But in difficult fingerprint identification,because of the small area of fingerprint,it may not be able to identify the fingerprint pattern,and the fingerprint line is fuzzy,it is difficult to identify a sufficient number of fingerprint detail features.Therefore these questions put forward the new request to the fingerprint in the more microscopic,the more detailed characteristic,through carries on the recognition and the confirmation to a certain line or several mastoid ridge microscopic characteristic,may promote the appraisal activity.Based on the three-level classification theory of fingerprint,combined with the current industry standard of fingerprint,this paper summarizes the concept of peeling fingerprint,based on the physiological structure of skin,the mechanism of skin peeling and the principle of skin print,the causes of identifiable fingerprint characteristics of skin peeling were analyzed.The characteristics of desquamate fingerprint were studied through the method of demonstration experiment and case analysis.Firstly,the temporal samples of peeling finger prints were collected,and the length of peeling finger prints and the repair of mastoid ridge were measured by 3D large area contour scanner,and the regularity of peeling finger prints was analyzed microscopically Secondly,the desquamated fingerprints of the subjects were pressed,and the length and height of the desquamated fingerprints in the diachronic samples were measured with a 3D large area contour scanner,through the change of height distribution,the characteristics of peeling fingerprint were studied,and the change rule of peeling fingerprint was summarized by the change of length.Then,the types of peeling,the morphological characteristics and the changing rules of peeling fingerprint were summarized by the experimental data and images,and the application of peeling fingerprint in fingerprint identification was explained.Thirdly,this paper discusses the characteristics of other characteristics and the practical application in fingerprint identification.Finally,the shortcomings of this paper are summarized,and the application of peeling fingerprint characteristics in practical identification is prospected.Generally speaking,the characteristics of desquamated fingerprints are specific,relatively stable and regular.Due to their variability and relative stability,they may be limited in fingerprint identification practice,in particular,the time of the sample material needs to be very close,but if we can master the characteristics of the peeling fingerprint,accurately identify the characteristics of the peeling fingerprint,and discover its characteristics,in the identification of difficult fingerprint identification and document production time,the characteristic of desquamate fingerprint can play its unique value role.