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The occlusion hypothesis is refuted: build 7 draws the same three ROT strips at higher alpha than English, so there was never an absence to explain. The 0.32-vs-11.9 tension that motivated it was an artefact of my own instrument. Both JP captures were shuttered on the plate pulse, and the plate's pulse is part of the animation -- so the gate synchronises the shutter to the animation's phase. Measured at the shutter instant, the sweep sits 25-26 px apart across two runs in different locales and different sessions: 1.6 % of a ~1600 px traverse. So the 0.32 I recorded as between-session capture noise measures my trigger's repeatability, and I read it as evidence the title is still when it is evidence the gate works. The era adjudication is unaffected -- margin 16.72 clears even the un-locked 11.9 -- and unaffected for the reason that file already gave: correlated noise cancels in a margin. Refutation attempt on sylpheed-port's positional-mechanism rejection: FAILED, the claim stands. Its residual sits inside lit logos, and the logo ROI is byte-identical across five differently-phased frames in two sessions. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
71 lines
3.2 KiB
Markdown
71 lines
3.2 KiB
Markdown
# The plate-pulse gate phase-locks the shutter to the title animation
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**measured** — 2026-08-30 · [data](../data/title-sweep-jp-draw-capture.txt) ·
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instrument `tools/re-capture/jp_draw_capture.sh`, control the English title
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draw log
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## The claim
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`wait_plate_pulse.py` waits for the title plate's glyph count to sit in
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[500, 2500] for 12 samples, and every title capture in this corpus shutters on
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it. It was adopted to answer *"has the screen settled?"* — and it does.
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But the plate's pulse **is** part of the title's animation, so gating on it does
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not only wait for settling: it **synchronises the shutter to the animation's
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phase**. Two runs gated this way are not two samples of a free-running clock.
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## The measurement
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The x of each tall ROT strip at the **first captured frame** — the shutter
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instant — in two independent runs, different sessions, *different locales*:
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| strip | EN run | JP run | apart |
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|---|---|---|---|
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| 883×1134 | x = −109 | x = −83 | **26 px** |
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| 1299×1303 | x = 486 | x = 461 | **25 px** |
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Against a traverse of ~1600 px, that is **1.6 %**. Two boots, two locales, two
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sessions, and the sweep is in essentially the same place both times.
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## What it invalidates — my own reading
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[`jp-title-at-rest.txt`](../data/jp-title-at-rest.txt) reasons that its second
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capture probes a new axis, *"BETWEEN runs, where a free-running clock lands
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somewhere else on a fresh boot"*, and reports **RMSE 0.32** in the era box as
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the between-session **capture noise**.
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🔴 **The clock does not land somewhere else.** The gate puts it back in the same
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place. So:
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* **0.32 is a phase-locked LOWER BOUND on capture noise, not capture noise.**
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At an arbitrary phase the in-box figure is the **11.9** measured between two
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EN captures a plateau-phase apart. Anything reusing 0.32 as "the noise floor"
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is quoting the gate, not the game.
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* I read the 0.32 as evidence the JP title is **still**. It is not. It is
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evidence the **gate works**. I had it backwards.
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* The whole-frame 116 492 px that *do* differ between those two sessions are
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consistent with exactly this: ~25 px of residual jitter displacing two large
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bright diagonal strips moves a lot of pixels globally while barely clipping
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the era box.
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## What it does NOT invalidate
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✅ **The era adjudication stands.** Its margin is **16.72** (41.69 fixed vs
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58.41 stale), which exceeds even the un-locked **11.9** figure — so it survives
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whichever noise number is correct. And the file's own key insight is untouched
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and is the reason it survives: capture noise moves both candidates together and
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**nearly cancels in a margin** (absolute scores moved 0.001–0.002 between
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sessions; the margin moved 0.001).
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✅ **The within-run at-rest result stands** — five frames ~1.5 s apart are *not*
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gated individually, so they sample different phases, and the logo ROI is
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byte-identical across them in **both** sessions while 5–8 % of the frame moves.
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## Reach of the negative
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This says the gate locks phase; it does not say by what mechanism. Both runs
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boot the same ISO from the same state, so the pulse may simply occur at a fixed
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offset from a deterministic boot rather than the gate doing the locking. **Two
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runs deliberately shuttered at different phases would separate those** and were
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not run.
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