class MirrorIntegratedDOMS:
    """后视镜集成 DOMS 架构分析"""
    
    def __init__(self):
        self.camera_position = 'interior_rearview_mirror'
        self.fov_horizontal = 140  # 度（覆盖全舱宽度）
        self.fov_vertical = 80    # 度（覆盖仪表台到车顶）
        self.resolution = '2MP+'
        self.ir_wavelength = 940  # nm
        self.ir_type = 'VCSEL'   # 或 LED
        
    def compute_coverage(self, cabin_dimensions):
        """
        计算后视镜位置的视野覆盖
        
        Args:
            cabin_dimensions: dict, 座舱尺寸
        """
        mirror_height = 1.3  # m, 后视镜离地高度
        results = {}
        
        # 驾驶员（距离 ~1.2m）
        driver_dist = 1.2
        results['driver'] = {
            'distance': driver_dist,
            'face_pixels': self._calc_face_pixels(driver_dist),
            'upper_body': True,
            'hands': True
        }
        
        # 后排乘客（距离 ~1.5m）
        rear_dist = 1.5
        results['rear_passenger'] = {
            'distance': rear_dist,
            'face_pixels': self._calc_face_pixels(rear_dist),
            'body': True,
            'cpd_capable': True
        }
        
        # 安全带（距离 0.5-2.0m）
        results['seatbelt'] = {
            'distance_range': (0.5, 2.0),
            'resolution': 'belt_width ~10px at 2m',
            'detection_capable': True
        }
        
        return results
    
    def _calc_face_pixels(self, distance):
        """计算给定距离下的面部像素数"""
        # 假设 2MP, FOV 140°, 面部宽度 15cm
        focal_px = 1920 / (2 * np.tan(np.radians(140/2)))
        face_width_px = (0.15 / distance) * focal_px
        return int(face_width_px)