Aligning Shoeprint Images that have nonlinear distortion effects
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2024-08-12
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Abstract
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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The following poster was presented at the 108th International Association for Identification (IAI) Annual Educational Conference, Reno, Nevada, August 11-17, 2024.