docs: 其余易混淆字符(x/>=/<=/~/OK 取代 × − ≥ ≤ ≈ ✓)
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@@ -121,5 +121,5 @@ spine = angle(neck, pelvis, midpoint(left_ankle, right_ankle))
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`angle(a, b, c)` = 向量 `ba` 与 `bc` 的夹角余弦,即
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`dot(normalize(a-b), normalize(c-b))`,落在 `[-1, 1]`。
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**DTW 序列结构(冻结)**:每帧 = `[33 × (x, y, z), 9 个关节角余弦] = 108 维`。
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**DTW 序列结构(冻结)**:每帧 = `[33 x (x, y, z), 9 个关节角余弦] = 108 维`。
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低置信度点(`visibility < 0.5`)在插值阶段由相邻帧线性补全,不参与代价计算。
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