mirror of
https://github.com/wiltodelta/remove-ai-watermarks.git
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Victor KuznetsovandClaude Opus 4.8
836d87ed68
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
85 lines
3.7 KiB
Python
85 lines
3.7 KiB
Python
"""A mark the `tophat` front-end DETECTS must also be MASKABLE.
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Corpus-found 2026-07-20: Doubao's detection moved to the continuous `tophat` front-end
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(which does not binarize, and that is where its recall 89% -> 92% came from), but the
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removal mask still came from the BINARIZED glyph blob. A mark faint enough to be found
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only by the continuous response therefore produced an empty binary blob, `localize`
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returned mask=None, and `remove()` was a silent no-op: `identify` reported
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`visible_doubao` while `visible` said "no visible mark" on the same file. Measured on the
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full corpus parity sweep: 57 of 60 sampled still-detected Doubao marks were untouched
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no-ops, ~8% of all Doubao detections.
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"""
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from __future__ import annotations
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import cv2
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import numpy as np
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import pytest
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from remove_ai_watermarks.doubao_engine import DoubaoEngine
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def _faint_mark_image(w: int = 900, h: int = 1200, alpha: float = 0.06) -> np.ndarray:
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"""A mid-gray frame carrying the REAL Doubao glyph shape at very low opacity.
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The shape has to be genuine or the NCC detector will not fire and the test would be
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exercising nothing; the low ``alpha`` is what keeps the binarizing path from finding
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a blob. Composited with the same forward model the marks use:
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``stamped = (1-a)*bg + a*white``.
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"""
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from remove_ai_watermarks._text_mark_engine import load_alpha_template
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tmpl = load_alpha_template("doubao_alpha.png")
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if tmpl is None:
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pytest.skip("doubao alpha asset unavailable")
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img = np.full((h, w, 3), 120, np.uint8)
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eng = DoubaoEngine()
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loc = eng.locate(img)
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base = eng.scale_base(img)
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gw = max(eng.config.min_gw, int(eng.config.alpha_width_frac * base))
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gh = max(4, int(eng.config.alpha_height_frac * base))
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a = cv2.resize(tmpl, (gw, gh), interpolation=cv2.INTER_AREA).astype(np.float32) * alpha
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x = loc.x + (loc.w - gw) // 2
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y = loc.y + (loc.h - gh) // 2
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roi = img[y : y + gh, x : x + gw].astype(np.float32)
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a3 = a[..., None]
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img[y : y + gh, x : x + gw] = np.clip(roi * (1 - a3) + 255.0 * a3, 0, 255).astype(np.uint8)
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return img
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class TestFaintMarkIsMaskable:
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def test_binary_glyph_blob_is_empty_on_a_faint_mark(self):
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"""The premise: this is the input class the binarizing path cannot segment."""
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eng = DoubaoEngine()
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img = _faint_mark_image()
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loc = eng.locate(img)
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glyph = eng.extract_mask(img, loc)
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assert int((glyph > 0).sum()) < eng._MIN_GLYPH_PIXELS
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def test_footprint_mask_is_not_empty_when_the_continuous_response_has_signal(self):
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"""The fix: a faint mark must still yield a removal mask, without --no-detect.
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Without it `localize` returns None and removal silently does nothing while
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`identify` keeps reporting the mark.
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"""
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eng = DoubaoEngine()
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img = _faint_mark_image()
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mask = eng.footprint_mask(img, force=False)
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assert mask is not None, "a detectable faint mark produced no removal mask"
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assert int((mask > 0).sum()) > 0
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def test_a_clean_frame_still_produces_no_mask(self):
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"""The guard: the fallback must not turn every flat corner into a fill."""
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eng = DoubaoEngine()
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clean = cv2.GaussianBlur(np.full((1200, 900, 3), 120, np.uint8), (5, 5), 0)
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assert eng.footprint_mask(clean, force=False) is None
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@pytest.mark.parametrize("alpha", [0.5, 0.9])
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def test_a_bold_mark_is_unaffected(self, alpha: float):
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"""A mark the binary path already segments must keep its tight glyph box."""
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eng = DoubaoEngine()
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img = _faint_mark_image(alpha=alpha)
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mask = eng.footprint_mask(img, force=False)
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assert mask is not None
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assert int((mask > 0).sum()) > 0
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