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Vectorize the DWT-DCT decode path, 15x on the decoder

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Output stays bit-identical: decoder bits and detector verdicts recorded over
200 sampled data/ images plus two synthesized carriers before and after, and
the record is byte-identical.

Measured on a 1536x2816 image -- decoder 0.280s to 0.016s, warm identify()
1.757s to 1.365s with both arms timed in one process.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Victor Kuznetsov
2026-08-13 11:59:56 -07:00
co-authored by Claude Opus 5
parent 2d03a00a39
commit 37789e02f6
4 changed files with 117 additions and 40 deletions
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docs/code-provenance.md
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@@ -7,6 +7,11 @@ This page records notices required by source dependencies and licensed derivativ
- The DWT-DCT implementation derives from ShieldMnt's
[`invisible-watermark`](https://github.com/ShieldMnt/invisible-watermark), licensed
under MIT. Its notice ships in `src/remove_ai_watermarks/licenses/invisible-watermark-MIT.txt`.
The decode path is a vectorized reformulation, not a transcription: it produces
the same bits and is checked against upstream's own decoder, but it no longer
corresponds line by line to `imwatermark/maxDct.py`. Diffing the two files will
show structurally different code, which is expected and does not mean the
derivation notice is stale.
## Licensed test fixtures