1099 lines
30 KiB
HTML
1099 lines
30 KiB
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<meta name="description" content="Face-recognition pipeline for finding on-screen actor presence in film/TV, built on KPN++">
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<link rel="canonical" href="https://pages.tourolle.paris/dtourolle/scene-actor-extraction/pose-expansion/">
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<title>Pose Expansion - scene-actor-extraction</title>
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scene-actor-extraction
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Pose Expansion
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dtourolle/scene-actor-extraction
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How We Score Against X-Ray
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Findings
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Full Experiment Log
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Service Conversion (proposal)
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scene-actor-extraction
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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dtourolle/scene-actor-extraction
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How We Score Against X-Ray
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Findings
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Pose Expansion
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Pose Expansion
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<h1 id="pose-expansion-does-promoting-new-poses-mid-film-help">Pose expansion: does promoting new poses mid-film help?<a class="headerlink" href="#pose-expansion-does-promoting-new-poses-mid-film-help" title="Permanent link">¶</a></h1>
|
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<p><code>expand_gallery</code>
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(<a href="https://gitea.tourolle.paris/dtourolle/scene-actor-extraction/raw/commit/e5885977dfd04741a0d1bb7aaf0270d9c40a2fa8/src/gallery/track_gallery.hpp"><code>src/gallery/track_gallery.hpp</code></a>)
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promotes a confidently identified track's novel-pose reference views into a
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|
per-film, in-memory gallery annex. The idea: once the pipeline is confident
|
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about an identity, a pose it has not seen before (turned head, different
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lighting) becomes an extra reference for recognizing that actor again later
|
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in the same film, without touching the baked gallery.</p>
|
|
<h2 id="training-set-signal">Training-set signal<a class="headerlink" href="#training-set-signal" title="Permanent link">¶</a></h2>
|
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<p>Averaged across the 3 compared models (r50 excluded), on the 4 films used
|
|
for optimization. These are the corrected, full-coverage figures, see the
|
|
<a href="../model-bakeoff/#a-scoring-bug-worth-recording-dropped-film-evaluations">dropped-film note</a>
|
|
in the experiment log for why an earlier version of this table overstated the
|
|
full-mode misID jump (209 → 864) that was itself partly a truncation artifact:</p>
|
|
<table>
|
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<thead>
|
|
<tr>
|
|
<th>scope</th>
|
|
<th>expansion</th>
|
|
<th>F1</th>
|
|
<th>R</th>
|
|
<th>misID</th>
|
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</tr>
|
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</thead>
|
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<tbody>
|
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<tr>
|
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<td>full</td>
|
|
<td>off</td>
|
|
<td>70.0%</td>
|
|
<td>57.6%</td>
|
|
<td>407</td>
|
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</tr>
|
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<tr>
|
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<td>full</td>
|
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<td>on</td>
|
|
<td>72.1%</td>
|
|
<td>61.5%</td>
|
|
<td>714</td>
|
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</tr>
|
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<tr>
|
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<td>restricted</td>
|
|
<td>off</td>
|
|
<td>75.1%</td>
|
|
<td>63.9%</td>
|
|
<td>179</td>
|
|
</tr>
|
|
<tr>
|
|
<td>restricted</td>
|
|
<td>on</td>
|
|
<td>76.7%</td>
|
|
<td>67.2%</td>
|
|
<td>120</td>
|
|
</tr>
|
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</tbody>
|
|
</table>
|
|
<p>In restricted mode, expansion looks like a clean win: +1.6pp F1, +3.3pp
|
|
recall, lower misID. In full mode it looks like a recall-for-misID trade:
|
|
+2.1pp F1, +3.9pp recall, but misID rises from 407 to 714. See
|
|
<a href="../model-bakeoff/">the full experiment log</a> for the per-model breakdown.
|
|
This asymmetry motivated the question below: does turning expansion on
|
|
change what gets recognized frame by frame, or is the aggregate F1 shift
|
|
coming from something else.</p>
|
|
<h2 id="held-out-test">Held-out test<a class="headerlink" href="#held-out-test" title="Permanent link">¶</a></h2>
|
|
<p>Same model, same tuned config, <code>expand_gallery</code> toggled on vs. off, nothing
|
|
else changed, full gallery mode, per-second scoring against X-Ray. This
|
|
isolates expansion from every other variable that differs between the
|
|
training-set rows above.</p>
|
|
<p>LVFace-B Glint360K, all 5 held-out films:</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>film</th>
|
|
<th>F1 (exp)</th>
|
|
<th>F1 (noexp)</th>
|
|
<th>TPI delta</th>
|
|
<th>FN delta</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>Benny & Joon</td>
|
|
<td>83.0%</td>
|
|
<td>83.0%</td>
|
|
<td>-2</td>
|
|
<td>+2</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Downton Abbey: A New Era</td>
|
|
<td>56.1%</td>
|
|
<td>56.2%</td>
|
|
<td>-7</td>
|
|
<td>+7</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Lovelace</td>
|
|
<td>77.5%</td>
|
|
<td>77.4%</td>
|
|
<td>+33</td>
|
|
<td>-33</td>
|
|
</tr>
|
|
<tr>
|
|
<td>The Many Saints of Newark</td>
|
|
<td>46.3%</td>
|
|
<td>46.3%</td>
|
|
<td>+2</td>
|
|
<td>-2</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Valerian and the City of a Thousand Planets</td>
|
|
<td>74.1%</td>
|
|
<td>74.1%</td>
|
|
<td>+2</td>
|
|
<td>-2</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>ArcFace R18, Benny & Joon, r18's own tuned config: F1 77.1% for both, TPI
|
|
and FN identical, FPI differs by 2.</p>
|
|
<p>Every film, both models tested: F1 differs by 0.1-0.2pp, TPI/FN swings are
|
|
in the tens out of tens of thousands. This is noise, not a signal.
|
|
Expansion made no measurable difference to per-second on-screen
|
|
identification on any held-out film tested.</p>
|
|
<h2 id="two-methodology-bugs-caught-during-this-check">Two methodology bugs caught during this check<a class="headerlink" href="#two-methodology-bugs-caught-during-this-check" title="Permanent link">¶</a></h2>
|
|
<p>Getting to the table above required catching two wrong turns, both worth
|
|
recording because they are exactly the kind of error that produces a false
|
|
positive "expansion helped" finding.</p>
|
|
<ol>
|
|
<li><strong>Timeout truncation.</strong> The first Downton Abbey <code>exp</code> replay was cut off
|
|
by a 60-second subprocess timeout at about 76% through the film (5589 of
|
|
7368 expected seconds). This silent data loss produced a large,
|
|
convincing-looking TPI gap (47938 vs 52032) purely because one run was
|
|
missing a quarter of the film. Caught by comparing <code>n_seconds</code> between
|
|
runs before trusting any score delta; fixed by re-running with a longer
|
|
timeout.</li>
|
|
<li><strong>Bbox-matching bug.</strong> An early per-second raw-annotation diff matched
|
|
each <code>exp</code> detection to the first <code>noexp</code> detection with IoU above 0.5,
|
|
not the best-overlapping one. With 3 faces close together in frame, this
|
|
produced spurious disagreements (for example "exp says Aidan Quinn,
|
|
noexp says Johnny Depp" at the same second) that vanished once the match
|
|
used the best-IoU candidate instead of the first one. Both configs had
|
|
actually output the same three names at the same three boxes.</li>
|
|
</ol>
|
|
<p>Both bugs independently pointed toward "expansion is doing something," and
|
|
both were artifacts of the comparison harness, not the pipeline. Before
|
|
trusting a dramatic before/after diff, check that both runs cover the same
|
|
seconds and that entities are matched by best overlap, not first found.</p>
|
|
<h2 id="conclusion">Conclusion<a class="headerlink" href="#conclusion" title="Permanent link">¶</a></h2>
|
|
<p>The training-set aggregate effect, particularly the full-mode misID
|
|
increase, does not reproduce on held-out data. At minimum it
|
|
is far smaller than the training-set numbers suggested; it may be sampling
|
|
variation from only 4 training films rather than a generalizable
|
|
mechanism. Note the same <em>class</em> of harness bug appears twice in this
|
|
investigation, the timeout truncation in bug #1 above, and the dropped-film
|
|
aggregation that inflated the raw training-set misID figures. Both make an
|
|
inert config look consequential; both are reasons to distrust a dramatic
|
|
training-set delta until it survives on held-out films, which this one did
|
|
not. This does not mean <code>expand_gallery</code> never does anything: the
|
|
mechanism is real, and
|
|
<a href="https://gitea.tourolle.paris/dtourolle/scene-actor-extraction/raw/commit/e5885977dfd04741a0d1bb7aaf0270d9c40a2fa8/src/gallery/track_gallery.hpp"><code>track_gallery.hpp</code></a>'s
|
|
promotion logging confirms tracks get confirmed and views get promoted
|
|
into the annex on every film tested. It means whatever effect expansion
|
|
has on final per-second identification was too small to detect against 5
|
|
held-out films with this scoring method. A cleaner test would need either
|
|
more held-out films or a metric that can see the annex's direct
|
|
contribution, such as tagging which reference embedding won each match;
|
|
neither was in scope for this pass.</p>
|
|
<p>Do not treat the training-set exp/noexp numbers in
|
|
<a href="../model-bakeoff/">the full experiment log</a> as proof that expansion changes
|
|
real-world behavior in either direction. On the evidence gathered so far,
|
|
it does not move the needle enough to see.</p>
|
|
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</article>
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