omprehensive View on Some New Methods For Enhancing and Lifting 2D Shoeprints
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1 omprehensive View on Some New Methods For Enhancing and Lifting 2D Shoeprints Impression and Pattern Evidence Symposium August, Florida USA Sarena Wiesner M.Sc., Yaron Shor M.Sc.
2 Main Principles To preserve all the evidence existing in the crime scene. To save time at the crime scene and do as much as possible in the lab.
3
4 The Ideal Shoeprints
5 Real-life Shoeprints
6 BPB A ph Reagent For Enhancement of Dust References: 1. The use of an adhesive lifter and ph indicator for the removal and enhancement of shoeprints in dust, Shor Y. Vinokurov A, Glattstein B. Journal of Forensic Sciences, Jan. 1998, Vol. 43 No1 pp ph Indicators as Chemical Reagents for the Enhancement of Footwear Marks, Glattstein B, Shor Y, Levin N, Zeichner A. Journal of Forensic Sciences, Jan. 1996, Vol. 41 No. 1 pp
7
8 Before After
9 Using a pneumatic press. Cleaning the gelatin lifter. References: 1. Lifting Shoeprints Using Gelatin Lifters and a Hydraulic Press, Shor Y, Tsach T, Vinokurov A, Glattstein B, Landau E, and Levin N. Journal of Forensic Sciences. Vol. 48 No. 2, March Removing Paper Residue from a Gelatin Lifter, Y. Shor, T. Tsach, S. Wiesner, G. Meir, J. Forensic Sci.,.50(6) 2005 pp
10 Lifting wet prints Gelatin lifter Electro static lifter
11 Using a pneumatic press to lift prints with black gelatin lifter
12 The pneumatic press
13 Placing the gelatin lifter
14 The pressing process
15 Cleaning the gelatin lifter
16 Cleaning the gelatin lifter A sheet with a shoeprint on it The shoeprint
17 Cleaning the gelatin lifter Before cleaning After cleaning
18 The Cleaning process
19 The lifting and cleaning processes shoeprint Gelatin lifter Adhesive lifter Substrate with loose fibers or dust Gelatin lifter
20 A: First lifter B: Second lifter C: Third lifter Four stages of cleaning: A: Original B: After 1 st Lifter C: After 2 nd Lifter D: After 3 rd Lifter ( Over shaving ) D after image enhancement D C B A
21 What happened to the shoeprint? The cleaning adhesive lifters First cleansing Second cleansing Third cleansing
22 What happened to the shoeprint? The cleaning adhesive lifters after treatment with bromo-phenol blue First cleansing Second cleansing Third cleansing
23 Before The final result After
24 Background subtraction
25 Before enhancement After enhancement with Amido Black This slide was contributed by Bill Boziak
26 Background after erasing the shoeprint Bloody shoeprint on multi-colored floor
27 Conventional image processing Background subtraction image processing
28 Real Case Before After
29 Angled Photographing of shoeprints Reference: The Evidential Value of Distorted and Rectified Digital Images in Shoeprints Examination, Shor Y, Tsach T and Chaikovsky A. Forensic Science International, Aug
30 Angled Photographing of shoeprints Angled photography of the same shoeprint Right angled photography of shoeprint on cardboard
31 Angled Photographing of shoeprints Shoeprint after straitening the scale
32 Lifting bloody shoeprints on clothes with Alginate
33 Lifting Bloody Footwear Impressions On Clothes with Alginate The print on the pants The print lifted with alginate putty
34 The proper working method ß
35 The effect of Alginate on the original print Before After
36 Water : Alginate ratio 2.4 water : Alginate ratio 4.8 water : Alginate ratio
37 LCV vs. amido-black on Alginate The print on the pants Alginate cast of the print Development with LCV Development with amido-black
38 Shoeprint revealed with Alginate Jeans Alginate cast Arch revealed
39 Thank you for your attention Impression and Pattern Evidence Symposium 2010
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