grokbot_ty
03d3fcf460
Lower the axial body threshold while retaining fringe rejection, minimize length-only tip inset, and make sheet sensitivity curves testable and conservative at zero.
37 lines
1.3 KiB
TypeScript
37 lines
1.3 KiB
TypeScript
/**
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* Sheet-vs-slab keep predicates used by the mask worker.
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* Extracted so unit tests can cover sensitivity curves without the worker.
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*/
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/** Keep slab pixels on a green sheet. Higher s widens the green-sheet match. */
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export function greenKeep(r: number, g: number, b: number, s: number): boolean {
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const t = Math.max(0, Math.min(100, s)) / 100;
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// s=0 removes only strongly green sheet; increasing sensitivity widens the match.
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const isSheet = g - Math.max(r, b) > 45 - 35 * t;
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return !isSheet;
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}
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/**
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* Keep slab pixels on a black sheet.
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* At s=0 only near-black sheet (very low lum) is removed so dark live-edge /
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* bark (lum ~25–50) stays. The match widens monotonically toward s=100 (#74).
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*/
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export function blackKeep(r: number, g: number, b: number, s: number): boolean {
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const t = Math.max(0, Math.min(100, s)) / 100;
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const lum = 0.2126 * r + 0.7152 * g + 0.0722 * b;
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// Old floor 40 ate dark wood at minimum sensitivity. Floor 10 isolates near-black.
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const isSheet = lum < 10 + 140 * t;
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return !isSheet;
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}
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export function autoPickSheet(
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samples: { r: number; g: number; b: number }[],
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): 'green' | 'black' {
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let gr = 0, gl = 0;
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for (const p of samples) {
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if (p.g - Math.max(p.r, p.b) > 20) gr++;
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if (0.2126 * p.r + 0.7152 * p.g + 0.0722 * p.b < 70) gl++;
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}
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return gl >= gr ? 'black' : 'green';
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}
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