[#80] Cycle-3: tighten the smooth gate so the curve-refit must earn its keep#81
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…ts keep The Schneider Bézier smooth pass degraded flat/outlined linework (fattened/ raggedy outline band) yet shipped because the gate kept it within a 0.06 free SSIM-loss budget + a wobble-relief escape. Raw SSIM rewards the antialiased staircase, so SSIM alone tolerated a fattening smooth (gate audit: smooth lowers SSIM on 25/25 corpus+probe cases, −0.007..−0.073). Replace the free-pass with a ridge-width-uniformity keep-test (the eye-aligned screen): keep smooth only when it does not worsen outline width uniformity (ridge p90/IQR non-regression), with a small SSIM earn-floor as a feature-loss backstop. The transparent_background subject-extraction path keeps the prior lenient behavior (its region masking depends on the smoothed geometry). Bump 0.6.0 -> 0.7.0 (behavior change). Both POs eye-gated; output is pixel-identical to the validated bundle on the corpus; full suite green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Fixes #80.
What
Replace the smooth-gate's 0.06 free SSIM-loss budget + staircase-fooled wobble-relief escape with a ridge-width-uniformity keep-test (the eye-aligned screen). Keep the Schneider Bézier smooth only when it does not worsen outline width uniformity (ridge p90/IQR non-regression), with a small SSIM earn-floor (0.02) as a feature-loss backstop. The
transparent_backgroundsubject-extraction path keeps the prior lenient behavior (itsdrop_background_pathsregion masking depends on the smoothed geometry).Bump
0.6.0 → 0.7.0(behavior change).Why
On flat/outlined illustration the smooth pass fattened/raggedied the already-clean outline band yet shipped because raw SSIM rewards the antialiased staircase, so the 0.06 tolerance tolerated a fidelity-negative smooth. Gate audit over the full corpus + downscaled probes: smooth lowers SSIM on 25/25 cases (−0.007…−0.073) and never earns its keep on this class. Stage-ladder localized it as the primary fidelity-loss stage (e.g. c_38 ridge p90 10→14, c_23 IQR 0.5→2.67).
Verification
transparent_backgroundregression (smooth is load-bearing there fordrop_background_paths); guard scoped to that path only.python -m buildgreen (0.7.0 sdist+wheel); full pytest 126 passed, 1 skipped.Follow-ups (separate, not in this PR)
_ridge_uniformitydark mask is luma-coarse on saturated-dark (navy) outlines; latentdrop_background_pathsfragility when smooth is off.🤖 Generated with Claude Code