Quantitative measurement & automated bullet comparison using HR optical 3D surface metrology

It is a general goal in the firearm and tool mark analysis sciences to provide quantifiable, objective information to assist the examiner with routine casework.
3D measurements of bullet surfaces enable quantifiable mathematical comparisons between any two surfaces, which can supplement traditional comparison microscopes or 3D virtual microscopy, which provide qualitative information.

In order to further that effort, we will present a method for making accurate topographic measurements of bullet land surfaces, along with a methodology to extract individual characteristics and calculate a composite comparison score between two bullets.
This makes it possible to automatically process large batches of bullets for comparison and provide the examiners with a list of probable bullet matches by applying filtering criteria on comparison scores.

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