lhk229
5ddf0cd392
Green spill bleeds into pixels ViTMatte marks as solid foreground (alpha~1), but despill was gated to the soft edge band (0.005<alpha<0.995) and weakened exactly there: the alpha tent peaked at 0.5 and bg_confidence (low on the character edge) further suppressed the correction. - (1) Apply despill to the whole foreground (alpha > edge_low) instead of the soft band only; neutral pixels stay untouched via the green-excess term. - (2) Weight by alpha at full strength across the opaque range (alpha>=0.5), easing off only where mostly transparent, instead of a tent peaking at 0.5. - (3) Drop bg_confidence as a despill gate; localise purely by green excess. Controlled comparison (same alpha, only despill changed), edge_green_excess: ViTMatte TestImage p95 0.239->0.176, mean 0.131->0.061 ViTMatte TestImage2 p95 0.231->0.165, mean 0.115->0.052 Removes now-unused DespillSettings fields edge_high and bg_confidence_weight. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
33 lines
675 B
YAML
33 lines
675 B
YAML
model:
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model_name: hustvl/vitmatte-base-composition-1k
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device: cuda
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matting_method: vitmatte
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fallback_to_chroma_alpha: false
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trimap:
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sure_bg_threshold: 0.92
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sure_fg_threshold: 0.12
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unknown_radius_ratio: 0.012
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fg_safe_radius_ratio: 0.006
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foreground:
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enabled: true
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edge_low: 0.005
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edge_high: 0.995
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min_unmix_alpha: 0.08
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unmix_strength: 0.70
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local_strength: 0.45
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local_blur_radius: 11
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local_alpha_threshold: 0.92
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local_bg_confidence_max: 0.20
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green_excess_margin: 0.015
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bg_confidence_weight: 0.70
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despill:
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enabled: true
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edge_low: 0.005
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strength: 0.92
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green_excess_margin: 0.015
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edge_expand_radius: 2
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alpha_weight_floor: 0.35
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