Blue shoeprint with a tread pattern on a white background.

Conference/Workshop:
108th International Association for Identification (IAI) Annual Educational Conference

Published: 2024

Primary Author: Gautham Venkatasubramanian

Secondary Authors: Zeynep Oghan, Alicia Carriquiry

Type: Poster

Research Area: Footwear, Forensic Statistics

Shoeprints are aligned before assessing similarity, and automatic alignment algorithms can handle differences in translation, rotation [1], and scale. But shoeprints recorded at a crime scene may be partials photographed at an angle without an L-scale, with perspective or other non-linear distortions. How is shoeprint alignment affected by nonlinear distortions in the questioned impression? To find out, we took a few images f rom the ShoeCase [2] database, distorted them by 5, 10, and 20 degrees with the warp tool in Photoshop, and then aligned them to mated and close-nonmated reference prints.

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