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Gate spectral bypass on watermark detection

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Blindly subtracting the codebook's carrier pattern from an image that
never had the watermark would imprint one instead of removing it. Now
each image is run through RobustSynthIDExtractor first, and the V3
bypass only runs when a watermark is actually detected; otherwise the
image passes through untouched (still eligible for metadata stripping).
This commit is contained in:
Aina Olaoluwa
2026-07-15 14:03:56 +01:00
parent 9b0f8d1a26
commit adf7ead01b
3 changed files with 47 additions and 10 deletions
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@@ -5,12 +5,17 @@ A small drag-and-drop desktop app around this repo's V3 spectral bypass
watermark left behind after using generative AI to restore old photographs.
- Drop images in, get cleaned copies out — no command line needed after setup.
- Runs `RobustSynthIDExtractor` on each image first. The spectral bypass only
runs if a watermark is actually detected; otherwise the image is passed
through untouched. (Blindly subtracting the codebook's carrier pattern from
an image that never had it would imprint a watermark-shaped artifact
instead of removing one — this is why detection gates the bypass.)
- Optionally strips all EXIF/XMP/IPTC metadata from the output (including any
AI-generation provenance tags such as C2PA content credentials or IPTC
`DigitalSourceType`), by rebuilding the file from raw pixel data.
- Runs fully offline. No network calls, no telemetry.
- Uses V3 (pure signal processing — numpy/scipy/opencv only, no PyTorch
required, no GPU needed).
- Uses V3 (pure signal processing — numpy/scipy/opencv/PyWavelets/
scikit-learn only, no PyTorch required, no GPU needed).
## Setup
@@ -35,7 +40,8 @@ The first double-click sets up the venv automatically if it doesn't exist yet.
## Notes
- Reads the codebook from `../artifacts/spectral_codebook_v3.npz` (already in
this repo) — no extra downloads.
- Reads the bypass codebook from `../artifacts/spectral_codebook_v3.npz` and
the detector codebook from `../artifacts/codebook/robust_codebook.pkl`
(both already in this repo) — no extra downloads.
- Subject to this repo's [LICENSE](../LICENSE): non-commercial use, with
required attribution to the original author.