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| """ 酒精损伤检测算法架构 基于 Smart Eye AIS 系统公开信息推导 """
import numpy as np from typing import Dict, Tuple
class AlcoholImpairmentDetector: """ 酒精损伤检测器 通过多模态行为特征融合,实时检测驾驶员酒精损伤状态 """ def __init__(self, config: Dict): super().__init__() self.blink_threshold = config.get('blink_threshold', 0.3) self.gaze_stability_threshold = config.get('gaze_stability', 0.4) self.head_stability_threshold = config.get('head_stability', 0.35) self.reaction_time_threshold = config.get('reaction_time', 2.0) self.history_window = config.get('history_window', 60) def extract_eye_features(self, eye_data: np.ndarray) -> Dict: """ 提取眼动特征 Args: eye_data: 眼动数据序列 (N, 6) [timestamp, left_openness, right_openness, gaze_x, gaze_y, gaze_z] Returns: eye_features: 眼动特征字典 """ blink_events = self._detect_blinks(eye_data[:, 1:3]) blink_freq = len(blink_events) / (len(eye_data) / 30) * 60 gaze_coords = eye_data[:, 3:5] gaze_stability = 1.0 / (np.std(gaze_coords, axis=0).mean() + 1e-6) saccade_freq = self._detect_saccades(gaze_coords) return { 'blink_frequency': blink_freq, 'gaze_stability': gaze_stability, 'saccade_frequency': saccade_freq } def extract_head_features(self, head_data: np.ndarray) -> Dict: """ 提取头部姿态特征 Args: head_data: 头部姿态数据 (N, 6) [timestamp, pitch, yaw, roll, pos_x, pos_y, pos_z] Returns: head_features: 头部特征字典 """ euler_angles = head_data[:, 1:4] head_stability = 1.0 / (np.std(euler_angles, axis=0).mean() + 1e-6) pitch = head_data[:, 1] droop_events = np.sum(pitch > 15) / len(pitch) return { 'head_stability': head_stability, 'droop_ratio': droop_events } def detect_impairment(self, eye_data: np.ndarray, head_data: np.ndarray, reaction_data: float = None) -> Tuple[bool, float]: """ 综合检测酒精损伤 Args: eye_data: 眼动数据 head_data: 头部姿态数据 reaction_data: 反应时间(秒) Returns: is_impaired: 是否损伤 impairment_score: 损伤评分 (0-1) """ eye_features = self.extract_eye_features(eye_data) head_features = self.extract_head_features(head_data) blink_score = self._normalize_score( eye_features['blink_frequency'], normal_range=(15, 25), impaired_range=(5, 35) ) gaze_score = eye_features['gaze_stability'] * 100 head_score = head_features['head_stability'] * 100 droop_score = (1 - head_features['droop_ratio']) * 100 reaction_score = 100 if reaction_data is not None: reaction_score = max(0, 100 - (reaction_data - 0.5) * 50) weights = { 'blink': 0.25, 'gaze': 0.25, 'head': 0.25, 'droop': 0.15, 'reaction': 0.10 } impairment_score = ( weights['blink'] * blink_score + weights['gaze'] * gaze_score + weights['head'] * head_score + weights['droop'] * droop_score + weights['reaction'] * reaction_score ) / 100 is_impaired = impairment_score < 0.6 return is_impaired, impairment_score def _detect_blinks(self, eye_openness: np.ndarray) -> list: """检测眨眼事件""" mean_openness = eye_openness.mean(axis=1) blink_threshold = 0.2 below_threshold = mean_openness < blink_threshold blink_events = [] for i in range(1, len(below_threshold)): if below_threshold[i] and not below_threshold[i-1]: blink_events.append(i) return blink_events def _detect_saccades(self, gaze_coords: np.ndarray) -> float: """检测扫视频率""" velocity = np.linalg.norm(np.diff(gaze_coords, axis=0), axis=1) saccade_threshold = 0.1 return np.sum(velocity > saccade_threshold) / len(velocity) * 100 def _normalize_score(self, value: float, normal_range: Tuple, impaired_range: Tuple) -> float: """归一化评分(0-100)""" if normal_range[0] <= value <= normal_range[1]: return 100 elif value < impaired_range[0] or value > impaired_range[1]: return 0 else: if value < normal_range[0]: return (value - impaired_range[0]) / (normal_range[0] - impaired_range[0]) * 100 else: return (impaired_range[1] - value) / (impaired_range[1] - normal_range[1]) * 100
if __name__ == "__main__": np.random.seed(42) normal_eye = np.random.rand(1800, 6) normal_eye[:, 1:3] = 0.8 + np.random.normal(0, 0.05, (1800, 2)) normal_eye[:, 3:5] = 0.5 + np.random.normal(0, 0.02, (1800, 2)) impaired_eye = np.random.rand(1800, 6) impaired_eye[:, 1:3] = 0.6 + np.random.normal(0, 0.15, (1800, 2)) impaired_eye[:, 3:5] = 0.5 + np.random.normal(0, 0.08, (1800, 2)) detector = AlcoholImpairmentDetector({}) normal_result = detector.detect_impairment(normal_eye, normal_eye) impaired_result = detector.detect_impairment(impaired_eye, impaired_eye) print(f"正常驾驶员: 损伤={normal_result[0]}, 评分={normal_result[1]:.2f}") print(f"损伤驾驶员: 损伤={impaired_result[0]}, 评分={impaired_result[1]:.2f}")
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