Effects of the Region and Amount of Fingerprint Minutiae on the Evaluation of Likelihood Ratio
Objective To explore the effects of different regions and amounts of fingerprint minutiae on the evaluation of likelihood ratio of fingerprint evidence,based on automatic fingerprint identification system(AFIS)score,and to provide scientific and reliable AFIS score data for the construction of likelihood ratio model for fingerprint evidence.Methods 200 fingerprints simulated to those collected at crime scene were made.According to three different minutiae regions(the center and left/right delta)and 12 different minutiae numbers ranging from 5 to 16,the fingerprints were assembled and sent to both the self-constructed same-source fingerprint database and the ten-million-person different-source fingerprint database for matching using AFIS.The match scores from the two databases were analyzed quantitatively using statistical methods.Results For different regions of fingerprints,the results including concentration trend,high score range,and maximum values of similarity scores for same-source fingerprints were significantly better than those of different-source fingerprints.Different-source fingerprints exhibited a similar data of concentration trend across different regions.Regarding the amounts of different minutia,as the amount increased,the score variation range of same-source fingerprints was larger than that of different-source fingerprints,and the dispersion of scores of same-source fingerprints gradually increased.However,the scores of different-source fingerprints exhibited different characteristics for different amounts of minutia,showing segmented situations.Conclusion This study used AFIS to conduct"black box"experiments on the region and amount of minutia influencing the evaluation method for fingerprint evidence.The quantitative analysis method is simple and easy to implement,and is also in line with the actual quantitative analysis of the factors affecting the fingerprint evidence in ultra-large-capacity databases.The results help to enrich the forensic expert's understanding of the region and amount of minutiae,which is conducive to the construction of a scientific and reliable likelihood ratio evaluation model for fingerprint evidence.
fingerprint identificationregion of minutiaamount of minutiasame-source fingerprintdifferent-source fingerprint
国家科技期刊平台
NSTL
万方数据
