presentation attack detection

The definition, in our words

The methods used to decide whether a biometric sample comes from a live person present at the point of capture.

Why the distinction matters

Detection is a security function, not an accuracy feature. A system can estimate age well and still fail the security question if a printed photograph passes as a face.

How to use it in a comparison

Report the attack instruments tested, the acceptance rate for each and the attack potential the test assumed. A pass with no stated attack potential cannot be compared with another laboratory's pass.

Where it changes the evidence

A definition is not decoration. It decides which test is meaningful and which result can be compared. Where a supplier's material uses the term differently, the comparison should quote the supplier's use and place it beside this one. A difference in definition is a finding about comparability, and it belongs in the report rather than in a footnote.

The analysis units on this site use the term as the framework defines it. Where a unit turns the term into a question, the question is written on the unit page and the evidence artefact is named. The kit repeats both, so a row in the register and a paragraph in the report use the same meaning.