Replaces the 66px working estimate with the sweep result. 258 probes degraded
to each size and matched against a native-resolution gallery: 16px 46.5% TPI,
24px 93.4%, 32px 98.1%, 40px 99.2%, flat to 112px. The knee is 24-32 and 32
sits within about a point of the ceiling.
The estimate was roughly twice too strict. At 66px a large share of usable
faces would have been discarded, and on 480x360 sources most of them — which
is exactly the resolution of the fixture corpus.
The more useful finding: false identification was 0.0 at every size, including
12px. Small faces fail by becoming unidentified, never by being attributed to
the wrong actor. That asymmetry is what makes a low threshold safe — the cost
of admitting a marginal face is a miss, not a false claim.
Caveat recorded rather than assumed: FPI grows with gallery size, so 258 actors
understates it against a full library. Treat 0.0 as an observation at this
scale, not a property.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
TRACES: AR-002, VR-005 | SR-002, PR-002
dtourolleandClaude Opus 5
e0f9c95689