dtourolle
4b5557974b
- switch report frames to the scene best/worst montage renderer (Onscreen/Offscreen panels + TPI/FPI/FN legend): perfect-second hero, wedding couple, funeral 19-of-20, polygraph bridging, crew-scene FN ceiling, Robert Patrick ground-truth gap, rapid-cut double label, Herbie Hancock on an in-fiction screen - deep dive restructured: extinction bridging framed as designed behavior with a measurable cost (debug overlay draws the boxes; the shipped output is presence windows), plus the face-vs-presence ceiling and two X-Ray-is-wrong exhibits - Material polish: light/dark palette toggle, landing-page grid cards, figure/caption CSS, how-to-read admonition; site_url set so 404 links resolve under the Pages subpath - README: perfect-second and screen-call frames committed (gitignore exceptions), readme_example.jpg retired - build_site.sh: stage_frame helper downscales montage frames to 1920px and pulls any missing montage-frames packages
3.8 KiB
scene-actor-extraction
A face-recognition pipeline that finds when each actor appears on screen in a film or TV episode — built on KPN++ (a C++20 Kahn Process Network library) for the detect → track → match → scene pipeline, with a Jellyfin-integrated gallery and an X-Ray-validated optimizer.
This is a perfect X-Ray second, on a film the optimizer never saw:
Every visible face named at 100% — Chris Noth, Hank Azaria, Bobby Cannavale — the background extra honestly left unnamed, and the two credited cast without a visible face correctly carried as present off-screen by the tracker's presence windows. That's the pipeline exactly reproducing Amazon X-Ray's record for this second.
It doesn't always go like that: the hardest held-out film scores 46% F1, and the report is honest about why — one tunable trade (extinction bridging at hard cuts), one structural ceiling (X-Ray credits people whose faces never appear), and a few cases where the pipeline is right and X-Ray is wrong. The evidence for all of it is in the pages below.
Start here — four questions this bake-off answers
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:material-trophy:{ .lg .middle } Which model is best?
Calibration curves first (discriminative power, independent of any threshold), then F1 on the actual benchmark. LVFace-B Glint360K wins both.
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:material-filter:{ .lg .middle } Whole vs. cast-restricted gallery
Restricting the matcher to a film's credited cast is a clean win on every axis (+3.3pp F1, less than a third the misIDs) — but isn't a shipped runtime feature yet.
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:material-account-convert:{ .lg .middle } Does pose expansion help?
A convincing training-set effect that didn't reproduce on 5 held-out films once two methodology bugs were caught and fixed. An honest null result, not a forced narrative.
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:material-magnify-expand:{ .lg .middle } Deep dive: LVFace-B Glint360K
The held-out generalization gap, how the error budget decomposes (extinction bridging at hard cuts, X-Ray's scene-membership vs. on-screen-face ceiling), and the frames where the pipeline is right and the ground truth is wrong.
The full technical log
- Model bake-off + threshold re-tune —
the complete experiment log behind the four pages above: the ROCm teardown
deadlock root cause and fix, DE concurrency tuning, the full 16-combo
results table, and every caveat. This is where the shipped
src/config.hppdefaults come from. - Optimizer experiments (prior round) — the earlier scene-union-metric tuning pass, superseded by the per-second metric used in the bake-off but kept for the ground-truth/architecture background.
- Service conversion (proposal) — design sketch for a native idle-GPU worker gated on screen lock, not yet built.
Reproducing the benchmarks
Gallery .h5 files, embedding dumps, the X-Ray corpus, montage frame images,
and DE trajectories are not committed to this repository — they're pushed to
the Gitea package registry and pulled on demand:
scripts/artifacts/pull_artifacts.sh galleries
scripts/artifacts/pull_artifacts.sh experiment-data
scripts/artifacts/pull_artifacts.sh montage-frames <film-slug>
See scripts/artifacts/push_artifacts.sh
for the upload side (requires a GITEA_TOKEN with package write scope).