The quantification of fingerprint quality using a relative contrast index

1. The quantification of fingerprint quality using a relative contrast index น.ส.อังสุมาล รอตภัย 51312337

2. introduction

3. Quality assessment methods

4. The contrast index contrast index คือ: contrast index = log10 (V/R) V คือ ค่าการสะท้อนแสงของช่องว่างของลายนิ้วมือ R คือ ค่าการสะท้อนแสงของเส้นนูนของลายนิ้วมือ

5. Materials and methods

7. Fingerprint deposition

9. Ninhydrin treatment The ninhydrin formulation contained0.4%(w/v)ninhydrin, 0.8%(v/v)acetic acid, 1.6%(v/v)ethanol and5%(v/v)isopropyl alcohol in92%(v/v) Forane 141B(1,1-dichloro-1-fluoroethane)

10. Amido black treatment Blood mark 100%methanol for15min Stain solutionfor3min

11. Washing solutionA which contained10% Acetic acid in methanol Washing solutionB containing5%acetic acid in distilled water Rinsed in distilled water

12. Physical developer treatment The physical developer working solution contained 5%silver nitrate solution(20%,w/v) and95%redox solution The redox Solution comprised3%(w/v)ferric nitrate,8%(w/v)ferrous ammoniumsulfate 2%(w/v)citric acid and4%(v/v) detergent surfactant stock solution in water

13. Reference standard

14. Data collection and analysis

15. Results

17. Reference standard

19. Inked fingerprints

20. Chemically enhanced fingermarks

21. Variance

22. table3

23. Discussion

24. End