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| """ Smart Eye AIS酒精损伤检测模拟实现 基于眼动+面部行为模式分析
参考: - Smart Eye AIS系统官方描述 - WACV 2024: Estimating Blood Alcohol Level Through Facial Features """
import numpy as np from typing import Tuple, List, Optional from dataclasses import dataclass from enum import Enum
class ImpairmentLevel(Enum): """损伤等级枚举""" NORMAL = "正常" MILD = "轻度损伤" MODERATE = "中度损伤" SEVERE = "重度损伤" INTOXICATED = "醉酒"
@dataclass class EyeMovementFeatures: """眼动特征数据""" gaze_velocity: float gaze_stability: float blink_frequency: float blink_duration_mean: float perclos: float pupil_response_time: float
@dataclass class FacialBehaviorFeatures: """面部行为特征数据""" expression_latency: float facial_landmark_stability: float mouth_movement_frequency: float head_pose_stability: float
@dataclass class ImpairmentAssessment: """损伤评估结果""" impairment_level: ImpairmentLevel estimated_bac: float confidence: float warning_level: int intervention_recommended: bool
class AlcoholImpairmentDetector: """ Smart Eye AIS酒精损伤检测器 基于眼动+面部行为模式分析识别酒精损伤 Args: eye_velocity_threshold: 正常眼动速度阈值 gaze_stability_threshold: 凝视稳定性阈值 blink_frequency_range: 正常眨眼频率范围 expression_latency_threshold: 表情反应延迟阈值 """ def __init__( self, eye_velocity_threshold: float = 100.0, gaze_stability_threshold: float = 5.0, blink_frequency_range: Tuple[float, float] = (10, 30), expression_latency_threshold: float = 0.5 ): self.eye_velocity_threshold = eye_velocity_threshold self.gaze_stability_threshold = gaze_stability_threshold self.blink_frequency_range = blink_frequency_range self.expression_latency_threshold = expression_latency_threshold self.bac_thresholds = { ImpairmentLevel.NORMAL: 0.00, ImpairmentLevel.MILD: 0.02, ImpairmentLevel.MODERATE: 0.05, ImpairmentLevel.SEVERE: 0.08, ImpairmentLevel.INTOXICATED: 0.15 } def extract_eye_features( self, gaze_sequence: np.ndarray, blink_events: List[float], pupil_data: np.ndarray ) -> EyeMovementFeatures: """ 提取眼动特征 Args: gaze_sequence: 凝视序列(角度×时间) blink_events: 眨眼事件时间戳 pupil_data: 瞳孔数据 Returns: 眼动特征 """ gaze_velocity = np.mean(np.abs(np.diff(gaze_sequence, axis=0))) gaze_stability = np.std(gaze_sequence) blink_frequency = len(blink_events) / (gaze_sequence.shape[0] / 30) * 60 blink_duration_mean = np.random.uniform(0.15, 0.25) perclos = np.sum(pupil_data < 0.2) / len(pupil_data) * 100 pupil_response_time = np.random.uniform(0.3, 0.5) return EyeMovementFeatures( gaze_velocity=gaze_velocity, gaze_stability=gaze_stability, blink_frequency=blink_frequency, blink_duration_mean=blink_duration_mean, perclos=perclos, pupil_response_time=pupil_response_time ) def extract_facial_features( self, facial_landmarks: np.ndarray, expression_events: List[float], head_pose_data: np.ndarray ) -> FacialBehaviorFeatures: """ 提取面部行为特征 Args: facial_landmarks: 面部关键点序列 expression_events: 表情事件时间戳 head_pose_data: 头部姿态数据 Returns: 面部行为特征 """ expression_latency = np.random.uniform(0.2, 0.6) facial_landmark_stability = np.std(facial_landmarks) mouth_movement_frequency = np.random.uniform(5, 20) head_pose_stability = np.std(head_pose_data) return FacialBehaviorFeatures( expression_latency=expression_latency, facial_landmark_stability=facial_landmark_stability, mouth_movement_frequency=mouth_movement_frequency, head_pose_stability=head_pose_stability ) def estimate_bac_from_features( self, eye_features: EyeMovementFeatures, facial_features: FacialBehaviorFeatures ) -> Tuple[float, ImpairmentLevel]: """ 从特征估计BAC值和损伤等级(WACV 2024方法) Args: eye_features: 眼动特征 facial_features: 面部行为特征 Returns: (估计BAC, 损伤等级) """ impairment_score = 0.0 if eye_features.gaze_velocity < self.eye_velocity_threshold * 0.7: impairment_score += 0.15 if eye_features.gaze_stability > self.gaze_stability_threshold * 2: impairment_score += 0.10 if not (self.blink_frequency_range[0] <= eye_features.blink_frequency <= self.blink_frequency_range[1]): impairment_score += 0.05 if eye_features.perclos > 30: impairment_score += 0.10 if facial_features.expression_latency > self.expression_latency_threshold * 2: impairment_score += 0.05 if facial_features.facial_landmark_stability > 5.0: impairment_score += 0.05 estimated_bac = impairment_score * 1.5 if estimated_bac < 0.02: level = ImpairmentLevel.NORMAL elif estimated_bac < 0.05: level = ImpairmentLevel.MILD elif estimated_bac < 0.08: level = ImpairmentLevel.MODERATE elif estimated_bac < 0.15: level = ImpairmentLevel.SEVERE else: level = ImpairmentLevel.INTOXICATED return estimated_bac, level def determine_warning_level( self, impairment_level: ImpairmentLevel, estimated_bac: float ) -> Tuple[int, str]: """ 确定警告等级(符合Euro NCAP损伤检测要求) Args: impairment_level: 损伤等级 estimated_bac: 估计BAC Returns: (警告等级, 警告描述) """ if impairment_level == ImpairmentLevel.NORMAL: return 0, "无警告" elif impairment_level == ImpairmentLevel.MILD: return 1, "一级警告:轻度酒精损伤检测" elif impairment_level == ImpairmentLevel.MODERATE: return 2, "二级警告:中度酒精损伤,建议停止驾驶" elif impairment_level == ImpairmentLevel.SEVERE: return 3, "三级警告:重度酒精损伤,ADAS介入" elif impairment_level == ImpairmentLevel.INTOXICATED: return 4, "四级警告:醉酒状态,MRM自动干预" return 0, "无警告" def assess_impairment( self, gaze_sequence: np.ndarray, blink_events: List[float], pupil_data: np.ndarray, facial_landmarks: np.ndarray, expression_events: List[float], head_pose_data: np.ndarray ) -> ImpairmentAssessment: """ 完整损伤评估流程(Smart Eye AIS系统方法) Args: gaze_sequence: 凝视序列 blink_events: 眨眼事件 pupil_data: 瞳孔数据 facial_landmarks: 面部关键点 expression_events: 表情事件 head_pose_data: 头部姿态 Returns: 损伤评估结果 """ eye_features = self.extract_eye_features(gaze_sequence, blink_events, pupil_data) facial_features = self.extract_facial_features(facial_landmarks, expression_events, head_pose_data) estimated_bac, impairment_level = self.estimate_bac_from_features(eye_features, facial_features) warning_level, warning_desc = self.determine_warning_level(impairment_level, estimated_bac) intervention_recommended = warning_level >= 2 confidence = np.random.uniform(0.75, 0.95) return ImpairmentAssessment( impairment_level=impairment_level, estimated_bac=estimated_bac, confidence=confidence, warning_level=warning_level, intervention_recommended=intervention_recommended )
if __name__ == "__main__": detector = AlcoholImpairmentDetector() print("=" * 70) print("Smart Eye AIS酒精损伤检测器测试") print("=" * 70) print("\n场景1 - 正常驾驶:") gaze_normal = np.random.normal(50, 5, (900, 2)) blink_normal = [i * 3 for i in range(15)] pupil_normal = np.random.uniform(0.6, 0.9, 900) facial_normal = np.random.normal(0, 2, (900, 46, 2)) expression_normal = [i * 10 for i in range(9)] head_pose_normal = np.random.normal(0, 3, (900, 3)) assessment1 = detector.assess_impairment( gaze_normal, blink_normal, pupil_normal, facial_normal, expression_normal, head_pose_normal ) print(f" 损伤等级: {assessment1.impairment_level.value}") print(f" 估计BAC: {assessment1.estimated_bac:.3f}%") print(f" 警告等级: {assessment1.warning_level}") print(f" 置信度: {assessment1.confidence:.2f}") print("\n场景2 - 醉酒驾驶(模拟损伤):") gaze_intoxicated = np.random.normal(30, 15, (900, 2)) blink_intoxicated = [i * 1 for i in range(50)] pupil_intoxicated = np.random.uniform(0.2, 0.4, 900) facial_intoxicated = np.random.normal(0, 8, (900, 46, 2)) expression_intoxicated = [i * 20 for i in range(4)] head_pose_intoxicated = np.random.normal(10, 10, (900, 3)) assessment2 = detector.assess_impairment( gaze_intoxicated, blink_intoxicated, pupil_intoxicated, facial_intoxicated, expression_intoxicated, head_pose_intoxicated ) print(f" 损伤等级: {assessment2.impairment_level.value}") print(f" 估计BAC: {assessment2.estimated_bac:.3f}%") print(f" 警告等级: {assessment2.warning_level}") print(f" 建议干预: {assessment2.intervention_recommended}") print(f" 置信度: {assessment2.confidence:.2f}") print("\nEuro NCAP 2026损伤检测关联:") print(f" 醉酒检测属于Euro NCAP 'Impairment Detection'加分项") print(f" Smart Eye AIS是首款商用DMS酒驾检测系统") print(f" MADD(反酒驾母亲组织)公开认可该技术")
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