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| """ Smart Eye Alcohol Impairment Detection 核心行为识别算法(推断)
论文来源:CES 2026 Innovation Awards 核心创新:基于真实饮酒驾驶数据训练的行为识别模型 """
import numpy as np from typing import Tuple, List from dataclasses import dataclass
@dataclass class EyeBehaviorFeatures: """眼部行为特征""" blink_rate: float blink_duration_mean: float blink_duration_std: float eyelid_openness: float saccade_velocity: float gaze_stability: float pupil_size: float
class AlcoholImpairmentDetector: """ 酒精损伤实时检测器 基于眼部行为特征判断驾驶员是否处于酒精损伤状态 使用现有DMS硬件,无需额外传感器 核心原理: 1. 酒精会影响中枢神经系统,导致眼动控制能力下降 2. 醉酒状态下眨眼模式异常(频率增加、时长不稳定) 3. 视线稳定性下降、眼动速度减缓 4. 与疲劳不同,酒精损伤有独特的行为模式 """ def __init__(self, config: dict = None): self.config = config or {} self.baseline = { 'blink_rate': (10, 20), 'blink_duration_mean': (150, 250), 'gaze_stability': (0.8, 1.0), 'saccade_velocity': (100, 300) } self.impairment_thresholds = { 'blink_rate_high': 35, 'blink_duration_var_high': 0.5, 'gaze_stability_low': 0.6, 'saccade_velocity_low': 80 } def extract_features(self, eye_tracking_data: np.ndarray, fps: int = 30) -> EyeBehaviorFeatures: """ 从眼动数据提取行为特征 Args: eye_tracking_data: 眼动追踪数据 (N, 7) [timestamp, eye_x, eye_y, eye_openness, pupil_size, blink_flag, gaze_velocity] fps: 帧率 Returns: EyeBehaviorFeatures: 提取的行为特征 """ blink_frames = eye_tracking_data[:, 5] == 1 blink_count = np.sum(blink_frames) duration_sec = len(eye_tracking_data) / fps blink_rate = (blink_count / duration_sec) * 60 if duration_sec > 0 else 0 blink_durations = self._calculate_blink_durations(blink_frames, fps) blink_duration_mean = np.mean(blink_durations) if len(blink_durations) > 0 else 0 blink_duration_std = np.std(blink_durations) if len(blink_durations) > 0 else 0 eyelid_openness = np.mean(eye_tracking_data[:, 3]) saccade_velocity = np.mean(eye_tracking_data[:, 6]) gaze_x = eye_tracking_data[:, 1] gaze_y = eye_tracking_data[:, 2] gaze_variance = np.var(gaze_x) + np.var(gaze_y) gaze_stability = 1.0 / (1.0 + gaze_variance * 100) pupil_size = np.mean(eye_tracking_data[:, 4]) return EyeBehaviorFeatures( blink_rate=blink_rate, blink_duration_mean=blink_duration_mean, blink_duration_std=blink_duration_std, eyelid_openness=eyelid_openness, saccade_velocity=saccade_velocity, gaze_stability=gaze_stability, pupil_size=pupil_size ) def detect(self, features: EyeBehaviorFeatures, driving_context: dict = None) -> Tuple[bool, float, str]: """ 检测酒精损伤状态 Args: features: 眼部行为特征 driving_context: 驾驶上下文(速度、路况等) Returns: (is_impaired, confidence, level) """ scores = [] if features.blink_rate > self.impairment_thresholds['blink_rate_high']: scores.append(1.0) elif features.blink_rate > self.baseline['blink_rate'][1]: scores.append(0.5) else: scores.append(0.0) if features.blink_duration_mean > 0: cv = features.blink_duration_std / features.blink_duration_mean if cv > self.impairment_thresholds['blink_duration_var_high']: scores.append(1.0) else: scores.append(cv * 2) else: scores.append(0.0) if features.gaze_stability < self.impairment_thresholds['gaze_stability_low']: scores.append(1.0) elif features.gaze_stability < self.baseline['gaze_stability'][0]: scores.append(0.6) else: scores.append(0.0) if features.saccade_velocity < self.impairment_thresholds['saccade_velocity_low']: scores.append(1.0) elif features.saccade_velocity < self.baseline['saccade_velocity'][0]: scores.append(0.5) else: scores.append(0.0) confidence = np.mean(scores) if confidence > 0.75: level = "SEVERE_IMPAIRMENT" is_impaired = True elif confidence > 0.5: level = "MODERATE_IMPAIRMENT" is_impaired = True elif confidence > 0.3: level = "MILD_IMPAIRMENT" is_impaired = False else: level = "NORMAL" is_impaired = False return is_impaired, confidence, level def _calculate_blink_durations(self, blink_frames: np.ndarray, fps: int) -> np.ndarray: """计算每次眨眼的持续时长""" durations = [] in_blink = False blink_start = 0 for i, is_blink in enumerate(blink_frames): if is_blink and not in_blink: in_blink = True blink_start = i elif not is_blink and in_blink: in_blink = False duration_ms = (i - blink_start) * 1000 / fps if duration_ms > 30: durations.append(duration_ms) return np.array(durations)
if __name__ == "__main__": detector = AlcoholImpairmentDetector() np.random.seed(42) n_frames = 900 simulated_data = np.zeros((n_frames, 7)) simulated_data[:, 0] = np.arange(n_frames) / 30.0 simulated_data[:, 1] = np.random.normal(0.5, 0.03, n_frames) simulated_data[:, 2] = np.random.normal(0.5, 0.03, n_frames) simulated_data[:, 3] = np.random.uniform(0.6, 0.9, n_frames) simulated_data[:, 4] = np.random.normal(4.5, 0.3, n_frames) simulated_data[:, 5] = np.random.choice([0, 1], n_frames, p=[0.92, 0.08]) simulated_data[:, 6] = np.random.uniform(50, 150, n_frames) features = detector.extract_features(simulated_data) print(f"眨眼频率: {features.blink_rate:.1f} 次/分钟") print(f"眨眼时长: {features.blink_duration_mean:.1f} ± {features.blink_duration_std:.1f} ms") print(f"视线稳定性: {features.gaze_stability:.3f}") print(f"眼动速度: {features.saccade_velocity:.1f} deg/s") is_impaired, confidence, level = detector.detect(features) print(f"\n检测结果: {level}") print(f"置信度: {confidence:.2%}")
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