As part of a tech challenge requested by the FBI’s Biometric Center of Excellence, groups were asked to report on their algorithms’ ability to:

Identify visually similar tattoos — possibly related — from different subjects;

Different instances of the same tattoo image from the same subject over time;

Visually similar or related tattoos from sketches, scanned print, computer graphics, or natural images; and

Determining whether an image contained a tattoo or not, among other capabilities.