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Add paired wavelet and spectral SynthID probes

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Victor Kuznetsov
2026-08-09 23:02:01 -07:00
parent 05f415b567
commit 89e683ecc1
4 changed files with 357 additions and 8 deletions
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docs/synthid.md
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@@ -258,6 +258,16 @@ research fidelity gate. The OpenAI periodic residual also reduced all three
local model scores on 11 of 11 additional images before and after JPEG-90, but
neither provider candidate has a negative matching-provider oracle verdict, so
neither is an established remover.
A later paired open-method control tested stationary wavelet and complex
spectral representations without treating another watermark as SynthID. On a
source-disjoint TrustMark P proxy, the SWT branch moved 59 of 60 transformed
clean/watermarked pairs in the correct direction but did not improve the
spatial model's aggregate AUC. Complex FFT maps were indistinguishable from
chance, and fixed phase scoring collapsed under crop. Wavelets therefore remain
a gated late-fusion ablation, while complex spectral analysis remains a
residual-discovery tool rather than a presence score.
The protocol, exact limitations, and next experiments are recorded in the
[`detector and removal research plan`](synthid-detector-removal-plan.md).