mirror of
https://github.com/wiltodelta/remove-ai-watermarks.git
synced 2026-06-05 02:28:00 +02:00
Victor Kuznetsov
175609b60a
detect_watermark's size-weighted global NCC search lets a larger, mediocre match (e.g. a bright collar in a portrait) outrank a small, near-perfect sparkle in the bottom-right corner, so a faint sparkle on a busy background scored below threshold and the image read as clean -- the regression from widening the search window 256px->512px between v0.7.2 and v0.8.8. Add _corner_promote: a bottom-right-corner raw-NCC pass that overrides the global pick when the corner holds a match with raw NCC >= 0.85 that beats it. It only ever replaces a lower-fidelity pick (cannot weaken an existing detection) and keeps the wider window for variant margins. The corner side is relative-clamped (0.20 of the short side, [96, 384]) so it stays a true corner at every scale: a fixed 256px covers ~70% of a small portrait, where a real photo raw-matches the star at ~0.81; relative tightening drops that to ~0.69. The 0.85 gate sits between the worst real-photo corner match (~0.78) and a genuine faint sparkle (~0.93): zero false positives across native + downscaled negatives, headshot rescued from below-threshold to 0.71. Factor the shared multi-scale matchTemplate loop into _scan_scales. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>