dw.jang
4cdd69ef3d
feat: low echo detection + Placement 알고리즘 업데이트 (원은지님 공유)
Low Echo Detection 업데이트:
- VALLEY_STOP_RISE: 10→50 (valley 스캔 early stop 임계)
- EDGE_DIST_DECAY: 0.12 (신규, edge 거리 penalty)
- Edge boundary 확장: left [leftLo:edge+1], right [edge-1:rightHi+1]
- Peak scoring: prominence → prominence / (1 + 0.12 × dist)
(low echo에 가까운 peak이 더 높은 점수)
Placement 알고리즘 전면 교체 (CV threshold 방식):
- 기존 urineLen score → cos-corrected depth의 CV(변동계수)
- CV ≤ 0.15 → PASS (Best Placement)
- CV > 0.15 → FAIL → weakest channel 기반 방향 안내
- CH0/CH1(top) weakest → MOVE DOWN
- CH2/CH3(bottom) weakest → MOVE UP
- severity: slight(<10%) / moderate(10~25%) / severe(≥25%)
- LR deviation: CH4/CH5 cos-corrected depth 비교
- |lr_dev| ≤ 0.15 → PASS
- lr_dev > 0 → MOVE RIGHT, < 0 → MOVE LEFT
- 반복 시 CV threshold 완화 (+0.02/회)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>