55 lines
2.3 KiB
JavaScript
55 lines
2.3 KiB
JavaScript
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// MediaPipe FaceLandmarker index tables.
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// Ring arrays are ORDERED traversals, not raw connection sets: vertex position
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// within a ring is the vertex's identity, and every downstream stage depends on
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// that ordering being stable. See docs/roto-puppet.md, "Fixed topology".
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// Rigid landmarks for the similarity fit. Eye corners, nose bridge, nose tip.
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// Nothing here may be a feature that moves under performance: including the
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// mouth or brows bleeds performance into the stabilization.
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export const RIGID = [33, 133, 362, 263, 168, 6, 1];
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// Outer lip ring, clockwise from the right corner over the top.
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// index 0 = right corner, 5 = top centre, 10 = left corner, 15 = bottom centre.
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export const LIPS_OUTER = [
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61, 185, 40, 39, 37, 0, 267, 269, 270, 409,
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291, 375, 321, 405, 314, 17, 84, 181, 91, 146,
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];
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// Inner lip ring, same orientation and the same four cardinal positions.
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export const LIPS_INNER = [
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78, 191, 80, 81, 82, 13, 312, 311, 310, 415,
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308, 324, 318, 402, 317, 14, 87, 178, 88, 95,
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];
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// Inner upper / lower lip centres. Their separation is the aperture signal that
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// decides whether the mouth interior is present at all.
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export const APERTURE = [13, 14];
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// Face oval, used only to derive the placeholder plate in v1.
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export const FACE_OVAL = [
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10, 338, 297, 332, 284, 251, 389, 356, 454, 323, 361, 288,
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397, 365, 379, 378, 400, 377, 152, 148, 176, 149, 150, 136,
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172, 58, 132, 93, 234, 127, 162, 21, 54, 103, 67, 109,
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];
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// Eye corners, for the calibration box and for reporting fit residual.
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export const EYE_INNER = [133, 362];
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// Pick `n` slots from a ring of `len` by even spacing. Returns RING POSITIONS,
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// not landmark ids: positions are the vertex identity downstream, and mapping ids
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// back to positions with indexOf would silently pick the wrong slot if a table
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// ever repeated an id.
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//
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// For even n this naturally lands on the cardinal positions (corners and lip
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// centres) of a 20-point ring. Fixed indices, never adaptive decimation: the
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// vertex at slot k means the same thing on every frame of the shot.
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export function subsampleSlots(len, n) {
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const out = [];
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for (let k = 0; k < n; k++) out.push(Math.round((k * len) / n) % len);
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return out;
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}
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export function subsampleRing(ring, n) {
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return subsampleSlots(ring.length, n).map((s) => ring[s]);
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}
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