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feat(exercise): 优化死虫式训练姿态检测算法

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- 调整视频处理频率从每帧处理改为每2帧处理
- 添加膝角趋势平滑算法减少单帧抖动误判
- 改进对角伸展检测逻辑支持准备位手臂上举
- 优化状态机确保严格回到准备姿态才计数
- 添加姿态丢失时的候选帧清理机制
- 更新音频文件生成路径至resources目录
- 改进macOS音频生成使用AIFF格式提高质量
- 添加详细的帧处理日志输出间隔配置
This commit is contained in:
wsy182
2026-06-10 22:57:35 +08:00
parent ea0c007441
commit 6dee2a2ff3
9 changed files with 281 additions and 39 deletions
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app/exercises/dead_bug/state_machine.py
+118 -8
View File
@@ -3,6 +3,13 @@ from __future__ import annotations
from app.exercises.dead_bug.rules import detect_diagonal_extension, is_ready_position
from app.exercises.dead_bug.types import DeadBugMetrics, DeadBugPhase, DeadBugResult
_SMOOTHING_ALPHA = 0.45
_TREND_DELTA_DEGREES = 1.5
_SIDE_ANGLE_MARGIN = 10.0
_EXTENSION_START_ANGLE = 125.0
_EXTENSION_PEAK_ANGLE = 150.0
_READY_KNEE_ANGLE = 140.0
class DeadBugStateMachine:
"""死虫式动作状态机：管理READY/EXTENDING/NEED_RESET/NO_POSE状态转换"""
@@ -17,11 +24,26 @@ class DeadBugStateMachine:
self._candidate_side: str | None = None
self._candidate_frames = 0
self._reset_frames = 0
self._smooth_left_knee_angle: float | None = None
self._smooth_right_knee_angle: float | None = None
self._left_knee_delta = 0.0
self._right_knee_delta = 0.0
def mark_no_pose(self) -> None:
"""姿态丢失时清掉候选帧；已确认的半程动作保留，等待重新可见后完成回收。"""
if self.phase == DeadBugPhase.READY:
self.phase = DeadBugPhase.NO_POSE
self.active_side = None
self._candidate_side = None
self._candidate_frames = 0
self._reset_frames = 0
def update(self, metrics: DeadBugMetrics) -> DeadBugResult:
"""根据传入指标更新状态机并返回本次结果"""
side = detect_diagonal_extension(metrics)
ready = is_ready_position(metrics)
self._update_knee_trends(metrics)
side = self._detect_motion_side(metrics)
ready = self._is_stable_ready(metrics)
if side is None:
self._candidate_side = None
@@ -33,13 +55,16 @@ class DeadBugStateMachine:
self._candidate_frames = 1
if self.phase in (DeadBugPhase.READY, DeadBugPhase.NO_POSE):
if ready:
self.phase = DeadBugPhase.READY
if self._candidate_frames >= self.extension_confirm_frames and side is not None:
self.phase = DeadBugPhase.EXTENDING
self.active_side = side
self._reset_frames = 0
elif self.phase == DeadBugPhase.EXTENDING:
if side == self.active_side:
if ready or self._active_knee_retracting():
self.phase = DeadBugPhase.NEED_RESET
self._reset_frames = 1 if ready else 0
elif self.phase == DeadBugPhase.NEED_RESET:
if ready:
self._reset_frames += 1
@@ -54,21 +79,106 @@ class DeadBugStateMachine:
self._reset_frames = 0
feedback = list(metrics.feedback)
if side is None and not ready:
display_side = detect_diagonal_extension(metrics)
if display_side is None and not ready:
feedback.append("Extend opposite arm and leg only")
if ready:
feedback.append("Ready position")
elif side == "left_arm_right_leg":
elif display_side == "left_arm_right_leg":
feedback.append("Left arm + right leg")
elif side == "right_arm_left_leg":
elif display_side == "right_arm_left_leg":
feedback.append("Right arm + left leg")
is_standard = side is not None and not metrics.feedback
is_standard = display_side is not None and not metrics.feedback
return DeadBugResult(
rep_count=self.rep_count,
phase=self.phase,
side=side,
side=display_side,
is_standard=is_standard,
feedback=feedback[:3],
metrics=metrics,
)
def _update_knee_trends(self, metrics: DeadBugMetrics) -> None:
"""更新平滑膝角和本帧变化量，用连续趋势抵消单帧抖动。"""
previous_left = self._smooth_left_knee_angle
previous_right = self._smooth_right_knee_angle
if previous_left is None:
self._smooth_left_knee_angle = metrics.left_knee_angle
self._left_knee_delta = 0.0
else:
self._smooth_left_knee_angle = (
_SMOOTHING_ALPHA * metrics.left_knee_angle
+ (1.0 - _SMOOTHING_ALPHA) * previous_left
)
self._left_knee_delta = self._smooth_left_knee_angle - previous_left
if previous_right is None:
self._smooth_right_knee_angle = metrics.right_knee_angle
self._right_knee_delta = 0.0
else:
self._smooth_right_knee_angle = (
_SMOOTHING_ALPHA * metrics.right_knee_angle
+ (1.0 - _SMOOTHING_ALPHA) * previous_right
)
self._right_knee_delta = self._smooth_right_knee_angle - previous_right
def _detect_motion_side(self, metrics: DeadBugMetrics) -> str | None:
"""基于膝角趋势推断正在伸展的对角侧，手臂只作为辅助校验。"""
raw_side = detect_diagonal_extension(metrics)
if raw_side is not None and self._side_has_extension_motion(raw_side):
return raw_side
left = self._smooth_left_knee_angle
right = self._smooth_right_knee_angle
if left is None or right is None:
return raw_side
both_legs_high = left >= _EXTENSION_PEAK_ANGLE and right >= _EXTENSION_PEAK_ANGLE
if both_legs_high and abs(left - right) < _SIDE_ANGLE_MARGIN:
return None
if (
right >= _EXTENSION_START_ANGLE
and right - left >= _SIDE_ANGLE_MARGIN
and (self._right_knee_delta >= _TREND_DELTA_DEGREES or right >= _EXTENSION_PEAK_ANGLE)
):
return "left_arm_right_leg"
if (
left >= _EXTENSION_START_ANGLE
and left - right >= _SIDE_ANGLE_MARGIN
and (self._left_knee_delta >= _TREND_DELTA_DEGREES or left >= _EXTENSION_PEAK_ANGLE)
):
return "right_arm_left_leg"
return raw_side
def _side_has_extension_motion(self, side: str) -> bool:
"""确认对应腿处于伸展区或仍在伸展趋势中。"""
if side == "left_arm_right_leg":
angle = self._smooth_right_knee_angle
delta = self._right_knee_delta
else:
angle = self._smooth_left_knee_angle
delta = self._left_knee_delta
if angle is None:
return True
return angle >= _EXTENSION_PEAK_ANGLE or (
angle >= _EXTENSION_START_ANGLE and delta >= _TREND_DELTA_DEGREES
)
def _is_stable_ready(self, metrics: DeadBugMetrics) -> bool:
"""准备位需要双腿回到屈膝区域；使用平滑膝角避免单帧阈值跳变。"""
left = self._smooth_left_knee_angle
right = self._smooth_right_knee_angle
if left is None or right is None:
return is_ready_position(metrics)
return left <= _READY_KNEE_ANGLE and right <= _READY_KNEE_ANGLE
def _active_knee_retracting(self) -> bool:
"""确认已伸展的那条腿开始回收。"""
if self.active_side == "left_arm_right_leg":
return self._right_knee_delta <= -_TREND_DELTA_DEGREES
if self.active_side == "right_arm_left_leg":
return self._left_knee_delta <= -_TREND_DELTA_DEGREES
return False