lhk229
639fdf01b6
suppress_alpha_by_chroma was the one stage where colour evidence could veto the matting model outright, and every observed failure had the same shape: ViTMatte was right (raw ~0.97 on a white shirt over pastel blue, on blush over pink) and the bgc-keyed suppression crushed it, because bgc magnitude cannot tell a background-coloured subject from background residue. The matte's raw alpha can: it rates enclosed background pockets low (~0.28 median) and subject texture high. Suppression is now scaled by (1 - smoothstep(raw_alpha, suppress_raw_lo, suppress_raw_hi)) (defaults 0.85/0.98): colour evidence only vetoes the matte where the matte itself is unsure. The gate applies only when alpha really comes from ViTMatte; chroma-seeded alpha passes raw_alpha=None and keeps old behaviour. Set suppress_raw_lo: 1.0 to disable (verified byte-identical to the old output). Validated on both screen colours: pink #F4D8E8 face restored (skin alpha 0.841 -> 0.993, holes 17.2% -> 0.6%), pastel blue #CFEFFF unchanged-to-better (shirt +0.01, wisps identical, gap clearing 99.8%). Also fixes the long-deferred chroma-only pipeline defects (white shirt 0.900, light skin 0.989). CLI output verified byte-identical to the reviewed prototype on both images. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
73 lines
2.5 KiB
YAML
73 lines
2.5 KiB
YAML
# Background-colour prior. null = auto-detect the flat background colour from the
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# image border (raises if the border is not one clean flat colour). A hex string
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# like "#CFEFFF" sets it explicitly. Also overridable via --screen-color.
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screen_color: null
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model:
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model_name: hustvl/vitmatte-base-composition-1k
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device: cpu
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matting_method: vitmatte
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fallback_to_chroma_alpha: false
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segmentation:
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# enabled: true = single-segmenter pipeline (one seg model drives the trimap)
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# enabled: false = no seg model, chroma-only pipeline (Chroma + ViTMatte)
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enabled: true
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backend: birefnet # single trimap segmenter; switchable at runtime: --seg-backend birefnet|anime-seg
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model_name: ZhengPeng7/BiRefNet # matches backend; --seg-backend anime-seg auto-selects skytnt/anime-seg
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device: cpu
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input_size: 1024
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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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seg_core_threshold: 0.60
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seg_loose_threshold: 0.08
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# Trimap mode (segmentation pipeline only; also settable via --trimap-mode):
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# directional = chroma + seg + hue split; background-hued residual
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# (blue between hair) -> unknown, white shirt kept. (default)
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# seg = original fuse_trimap (no hue split).
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# directional-hard-bg = hard-remove background-hued pixels (aggressive; can eat
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# cool/shadowed white cloth).
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mode: directional
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seg_low: 0.15
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bg_hue_proj_min: 4.0
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alpha_post:
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chroma_suppress: true
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chroma_suppress_bg_low: 0.35
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chroma_suppress_bg_high: 0.80
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chroma_suppress_strength: 1.0
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# Matte-confidence gate: suppression fades where ViTMatte's raw alpha is high
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# (ramp lo -> hi), so colour evidence only vetoes the matte where it is unsure.
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# Set suppress_raw_lo: 1.0 to disable.
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suppress_raw_lo: 0.85
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suppress_raw_hi: 0.98
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foreground:
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enabled: true
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method: ml
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fallback_to_unmix: true
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ml_regularization: 0.00001
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# Legacy "unmix" method params (used only when method: unmix).
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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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edge_expand_radius: 2
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alpha_weight_floor: 0.35
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color_margin_lab: 4.0 # Lab chroma margin along the background-colour direction
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