InCaRPose:车载鱼眼相机相对位姿估计与外参标定

论文信息

核心创新

InCaRPose解决了车载鱼眼相机外参标定的挑战——后视镜位置的DMS/OMS摄像头会随驾驶员调整而改变位姿,传统标定方法难以处理:

  1. 高度畸变的鱼眼镜头
  2. 狭窄的车内空间遮挡
  3. 近红外(NIR)成像特性
  4. 需要实时运行(用于安全气囊决策)

关键创新:

  • Transformer架构直接处理畸变鱼眼图像,无需去畸变
  • 预测度量级平移(非尺度模糊),满足安全气囊部署需求
  • 纯合成数据训练,零样本泛化到真实座舱
  • 车辆无关的参考相对位姿表示

问题定义

后视镜相机位姿变化

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"""
后视镜相机位姿变化场景

场景:
- DMS/OMS摄像头安装在后视镜上
- 驾驶员手动调整后视镜角度
- 摄像头外参随之改变

挑战:
- 传统标定需要静止相机
- 每次调整后重新标定不现实
- 安全气囊部署需要精确的乘员位置
"""
class RearviewMirrorCamera:
"""
后视镜相机模型

典型参数:
- 视场角:180°-200°(鱼眼)
- 光谱:近红外(850nm)
- 位置:后视镜后方
- 调整范围:±30° 俯仰,±45° 水平
"""

def __init__(self):
# 相机内参
self.intrinsics = {
'focal_length': 1.4, # mm
'sensor_size': (1920, 1080),
'fov': 195, # 度
'distortion': 'fisheye'
}

# 标准外参(标定状态)
self.extrinsics_reference = {
'rotation': np.eye(3), # 3x3旋转矩阵
'translation': np.array([0, 0, 0]) # 相对于车辆坐标系
}

# 位姿变化范围
self.pose_variation = {
'pitch': (-30, 30), # 度
'yaw': (-45, 45),
'roll': (-10, 10),
'translation': 20 # mm(平移范围)
}

def simulate_pose_change(self, reference_image, delta_pose):
"""
模拟位姿变化

Args:
reference_image: 参考图像(标定状态)
delta_pose: 位姿变化 {'pitch': deg, 'yaw': deg, 'roll': deg}

Returns:
shifted_image: 位姿变化后的图像
"""
# 应用位姿变化到相机
new_extrinsics = self._apply_pose_delta(delta_pose)

# 渲染新视角(简化的射线投射)
shifted_image = self._render_new_view(reference_image, new_extrinsics)

return shifted_image, new_extrinsics

Euro NCAP安全关联

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"""
Euro NCAP对相机标定的安全要求

应用场景:
1. 乘员位置感知的安全气囊部署
- 需要在15-50ms内确定乘员位置
- OOP检测需要精确的相机位姿

2. 视线估计(驾驶员接管)
- L3/L4自动驾驶需要驾驶员接管
- 视线估计依赖精确的相机标定

3. 乘员分类
- 成人/儿童区分需要精确距离估计
"""
encap_requirements = {
'airbag_deployment': {
'time_budget': '15-50 ms', # 感知-执行总时间
'position_accuracy': '±50 mm', # 位置精度
'coordinate_system': 'ISO 8855'
},

'gaze_estimation': {
'angular_accuracy': '±2°',
'coordinate_system': '车辆坐标系'
},

'occupant_classification': {
'distance_accuracy': '±100 mm',
'update_rate': '≥30 Hz'
}
}

方法详解

1. 网络架构

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import torch
import torch.nn as nn
import torch.nn.functional as F
from transformers import ViTModel

class InCaRPose(nn.Module):
"""
InCaRPose: 座舱内相对位姿估计模型

架构:
1. Frozen Backbone: DINOv3 ViT (预训练视觉基础模型)
2. Feature Fusion: 双视角特征融合
3. Transformer Decoder: 几何关系建模
4. Pose Head: 位姿预测

输入:
- 参考图像(标定状态)
- 目标图像(当前状态)

输出:
- 相对旋转 R (3x3)
- 相对平移 t (3,) - 度量级
"""

def __init__(self, config):
super().__init__()

# 冻结的视觉基础模型
self.backbone = ViTModel.from_pretrained('dinov3-small')
for param in self.backbone.parameters():
param.requires_grad = False

# 特征维度
self.feature_dim = self.backbone.config.hidden_size # 384 for ViT-S

# 双视角特征融合
self.feature_fusion = nn.Sequential(
nn.Linear(self.feature_dim * 2, 512),
nn.LayerNorm(512),
nn.GELU(),
nn.Linear(512, 512)
)

# Transformer解码器(建模几何关系)
self.transformer_decoder = nn.TransformerDecoder(
nn.TransformerDecoderLayer(
d_model=512,
nhead=8,
dim_feedforward=2048,
dropout=0.1,
batch_first=True
),
num_layers=6
)

# 位姿预测头
self.rotation_head = nn.Sequential(
nn.Linear(512, 256),
nn.ReLU(),
nn.Linear(256, 9) # 3x3旋转矩阵
)

self.translation_head = nn.Sequential(
nn.Linear(512, 256),
nn.ReLU(),
nn.Linear(256, 3) # 3维平移向量
)

def forward(self, reference_image, target_image):
"""
Args:
reference_image: (B, 3, H, W) 参考图像
target_image: (B, 3, H, W) 目标图像

Returns:
pose_dict: {
'rotation': (B, 3, 3) 相对旋转矩阵,
'translation': (B, 3) 相对平移向量(米)
}
"""
B = reference_image.shape[0]

# 1. 提取冻结特征
ref_features = self.backbone(reference_image).last_hidden_state # (B, N, D)
tgt_features = self.backbone(target_image).last_hidden_state

# 2. 特征融合
fused_features = self.feature_fusion(
torch.cat([ref_features, tgt_features], dim=-1)
) # (B, N, 512)

# 3. Transformer解码(参考作为memory,目标作为query)
decoded = self.transformer_decoder(
tgt=fused_features,
memory=ref_features
) # (B, N, 512)

# 4. 全局聚合
global_features = decoded.mean(dim=1) # (B, 512)

# 5. 位姿预测
rotation_flat = self.rotation_head(global_features) # (B, 9)
rotation = rotation_flat.view(B, 3, 3)

# 确保旋转矩阵正交性
rotation = self._orthogonalize(rotation)

translation = self.translation_head(global_features) # (B, 3)

return {
'rotation': rotation,
'translation': translation
}

def _orthogonalize(self, rotation):
"""
使用SVD正交化旋转矩阵

确保预测的旋转矩阵满足正交性约束:
R^T R = I
det(R) = 1
"""
B = rotation.shape[0]
orth_rotation = []

for i in range(B):
U, _, Vt = torch.linalg.svd(rotation[i])
R = U @ Vt
if torch.det(R) < 0:
R = -R
orth_rotation.append(R)

return torch.stack(orth_rotation)


class InCaRPoseLoss(nn.Module):
"""
InCaRPose损失函数

组成:
1. 旋转损失(角度距离)
2. 平移损失(L2距离,度量级)
"""

def __init__(self, rotation_weight=1.0, translation_weight=10.0):
super().__init__()
self.rotation_weight = rotation_weight
self.translation_weight = translation_weight

def forward(self, pred_pose, gt_pose):
"""
Args:
pred_pose: {'rotation': (B,3,3), 'translation': (B,3)}
gt_pose: {'rotation': (B,3,3), 'translation': (B,3)}
"""
# 旋转损失(角度距离)
rotation_diff = pred_pose['rotation'] @ gt_pose['rotation'].transpose(-1, -2)
trace = rotation_diff.diagonal(dim1=-2, dim2=-1).sum(-1)
angle_distance = torch.acos(torch.clamp((trace - 1) / 2, -1, 1))
rotation_loss = angle_distance.mean()

# 平移损失(L2)
translation_loss = F.mse_loss(
pred_pose['translation'],
gt_pose['translation']
)

# 总损失
total_loss = (
self.rotation_weight * rotation_loss +
self.translation_weight * translation_loss
)

return total_loss, {
'rotation_loss': rotation_loss.item(),
'translation_loss': translation_loss.item()
}

2. 数据处理

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"""
合成数据生成与增强
"""
class SyntheticCabinDataGenerator:
"""
合成座舱数据生成器

流程:
1. 从CAD模型渲染鱼眼图像
2. 应用随机位姿变化
3. 添加NIR光照效果
4. 后处理(噪声、遮挡)
"""

def __init__(self, cabin_model_path):
# 加载座舱3D模型
self.cabin_scene = self._load_cabin_model(cabin_model_path)

# 相机参数
self.camera_params = {
'fov': 195,
'resolution': (1920, 1080),
'distortion_model': 'fisheye',
'wavelength': 850 # nm (NIR)
}

def generate_pair(self, num_samples=1000):
"""
生成图像对(参考+目标)

Returns:
samples: [
{
'reference_image': np.array,
'target_image': np.array,
'relative_pose': {'rotation': (3,3), 'translation': (3,)}
}
]
"""
samples = []

for _ in range(num_samples):
# 1. 随机参考位姿(标准安装位置附近)
ref_pose = self._random_reference_pose()

# 2. 随机位姿变化(模拟后视镜调整)
delta_pose = self._random_delta_pose()
tgt_pose = self._compose_poses(ref_pose, delta_pose)

# 3. 渲染图像对
ref_image = self._render(ref_pose)
tgt_image = self._render(tgt_pose)

# 4. NIR光照效果
ref_image = self._apply_nir_lighting(ref_image)
tgt_image = self._apply_nir_lighting(tgt_image)

# 5. 增强噪声
ref_image = self._add_sensor_noise(ref_image)
tgt_image = self._add_sensor_noise(tgt_image)

samples.append({
'reference_image': ref_image,
'target_image': tgt_image,
'relative_pose': delta_pose
})

return samples

def _random_delta_pose(self):
"""
随机位姿变化

范围(模拟后视镜调整):
- 俯仰:±30°
- 水平:±45°
- 横滚:±10°
- 平移:±20mm
"""
pitch = np.random.uniform(-30, 30) * np.pi / 180
yaw = np.random.uniform(-45, 45) * np.pi / 180
roll = np.random.uniform(-10, 10) * np.pi / 180

rotation = self._euler_to_rotation(pitch, yaw, roll)

translation = np.random.uniform(-20, 20, 3) / 1000 # 米

return {
'rotation': rotation,
'translation': translation
}

def _apply_nir_lighting(self, image):
"""
应用近红外光照效果

NIR特性:
- 单色(灰度)
- 低动态范围
- 主动照明(均匀)
"""
# 转灰度
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

# NIR色调(略带红色)
nir_image = cv2.merge([
(gray * 0.9).astype(np.uint8), # R
(gray * 0.7).astype(np.uint8), # G
(gray * 0.7).astype(np.uint8) # B
])

return nir_image

3. 实时部署

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class RealTimePoseEstimator:
"""
实时位姿估计系统

应用场景:
1. 启动时标定(参考图像采集)
2. 运行时监测(检测位姿变化)
3. 安全气囊决策(紧急情况下位姿补偿)
"""

def __init__(self, model_path, device='cuda'):
self.model = InCaRPose({})
self.model.load_state_dict(torch.load(model_path))
self.model = self.model.to(device)
self.model.eval()

self.device = device
self.reference_image = None
self.calibrated_extrinsics = None

def calibrate(self, reference_image, known_extrinsics):
"""
启动时标定

保存参考图像和已知外参
"""
self.reference_image = self._preprocess(reference_image)
self.calibrated_extrinsics = known_extrinsics

def estimate_current_extrinsics(self, current_image):
"""
估计当前相机外参

流程:
1. 与参考图像计算相对位姿
2. 转换到车辆坐标系
"""
with torch.no_grad():
# 预处理
current_tensor = self._preprocess(current_image)

# 推理
pred_pose = self.model(
self.reference_image,
current_tensor
)

# 转换到车辆坐标系
current_extrinsics = self._compose_extrinsics(
self.calibrated_extrinsics,
pred_pose
)

return current_extrinsics

def check_calibration_drift(self, current_image, threshold_deg=5, threshold_mm=10):
"""
检测标定漂移

用于触发重新标定警告
"""
pred_pose = self.estimate_current_extrinsics(current_image)

# 计算角度偏差
angle_diff = self._rotation_to_angle(pred_pose['rotation'])

# 计算平移偏差
trans_diff = np.linalg.norm(pred_pose['translation'])

# 判断是否需要重新标定
need_recalibration = (
angle_diff > threshold_deg or
trans_diff * 1000 > threshold_mm
)

return {
'need_recalibration': need_recalibration,
'angle_drift': angle_diff,
'translation_drift': trans_diff * 1000 # mm
}


# 安全气囊集成示例
class AirbagDeploymentSystem:
"""安全气囊部署系统集成相机标定"""

def __init__(self):
self.pose_estimator = RealTimePoseEstimator('incarpose_weights.pth')
self.occupant_detector = OccupantDetector()

def decide_airbag_strategy(self, cabin_image, crash_event):
"""
安全气囊部署决策

时间预算:<15ms(从感知到执行)
"""
import time
start_time = time.time()

# 1. 获取当前相机外参(<2ms)
current_extrinsics = self.pose_estimator.estimate_current_extrinsics(cabin_image)

# 2. 乘员检测(带位姿补偿)
occupant_position = self.occupant_detector.detect(
cabin_image,
camera_extrinsics=current_extrinsics
)

# 3. 决策
if occupant_position['is_oop']:
# 乘员位姿异常,调整气囊策略
strategy = 'REDUCED_DEPLOYMENT'
else:
strategy = 'FULL_DEPLOYMENT'

decision_time = (time.time() - start_time) * 1000

return {
'strategy': strategy,
'occupant_position': occupant_position,
'decision_time_ms': decision_time
}

实验结果

合成数据集

作者发布In-Cabin-Pose测试数据集

特征 数值
图像对数 500
分辨率 1920×1080
视场角 195° 鱼眼
光谱 NIR (850nm)
位姿变化范围 ±30°俯仰, ±45°水平

性能指标

方法 旋转误差 (°) 平移误差 (mm) 推理时间 (ms)
传统SIFT+RANSAC 8.2 45 150
Reloc3R 5.1 28 85
InCaRPose (ViT-S) 3.5 12 15
InCaRPose (ViT-B) 2.8 9 35

跨场景泛化

测试集 旋转误差 (°) 平移误差 (mm)
合成座舱(训练) 3.5 12
真实座舱(测试) 4.2 15
7-Scenes 6.1 -

代码复现

推理脚本

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"""
InCaRPose推理脚本示例
"""
import cv2
import torch
import numpy as np

def main():
# 加载模型
model = InCaRPose({})
model.load_state_dict(torch.load('incarpose_vits.pth'))
model.eval()

# 加载图像对
ref_image = cv2.imread('reference_cabin.jpg')
tgt_image = cv2.imread('target_cabin.jpg')

# 预处理
ref_tensor = preprocess_image(ref_image).unsqueeze(0)
tgt_tensor = preprocess_image(tgt_image).unsqueeze(0)

# 推理
with torch.no_grad():
pose = model(ref_tensor, tgt_tensor)

# 后处理
rotation = pose['rotation'][0].numpy()
translation = pose['translation'][0].numpy()

# 打印结果
print("相对旋转矩阵:")
print(rotation)
print(f"\n相对平移向量 (米): {translation}")

# 计算角度变化
angle = np.arccos((np.trace(rotation) - 1) / 2) * 180 / np.pi
print(f"\n旋转角度: {angle:.2f}°")
print(f"平移距离: {np.linalg.norm(translation)*1000:.2f} mm")

def preprocess_image(image):
"""
预处理鱼眼图像

步骤:
1. 归一化
2. 调整大小
3. 转换为tensor
"""
# 归一化到[0,1]
image = image.astype(np.float32) / 255.0

# 标准化(ImageNet)
mean = np.array([0.485, 0.456, 0.406])
std = np.array([0.229, 0.224, 0.225])
image = (image - mean) / std

# 转换维度
image = image.transpose(2, 0, 1) # HWC -> CHW

return torch.from_numpy(image)

if __name__ == '__main__':
main()

IMS应用启示

1. 动态标定系统

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class DynamicCalibrationManager:
"""
动态标定管理器

功能:
1. 启动时自动标定
2. 运行时监测漂移
3. 触发重新标定警告
"""

def __init__(self):
self.pose_estimator = RealTimePoseEstimator('incarpose_weights.pth')
self.drift_history = []

def monitor_calibration(self, current_frame, timestamp):
"""
持续监测标定状态

漂移检测:
- 缓慢漂移(累积误差)
- 突然变化(后视镜调整)
"""
result = self.pose_estimator.check_calibration_drift(current_frame)

# 记录历史
self.drift_history.append({
'timestamp': timestamp,
'angle_drift': result['angle_drift'],
'translation_drift': result['translation_drift']
})

# 判断是否需要警告
if result['need_recalibration']:
self._send_recalibration_warning(result)

return result

def _send_recalibration_warning(self, drift_info):
"""
发送重新标定警告到HMI

Euro NCAP要求:
- 系统故障警告
- 不影响基本安全功能
"""
warning = {
'level': 2,
'type': 'CALIBRATION_DRIFT',
'message': 'DMS摄像头位姿变化,建议重新标定',
'drift': drift_info
}

# 发送到座舱HMI
self._send_to_hmi(warning)

2. OOP检测位姿补偿

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class OOPDetectorWithPoseCompensation:
"""
带位姿补偿的OOP检测器

应用:
- 安全气囊部署决策
- 乘员位姿异常检测
"""

def __init__(self):
self.pose_estimator = RealTimePoseEstimator('incarpose_weights.pth')
self.oop_classifier = OOPClassifier()

def detect_oop(self, cabin_image):
"""
OOP检测(带位姿补偿)

流程:
1. 估计当前相机位姿
2. 校正乘员检测坐标
3. 判断OOP状态
"""
# 获取当前外参
extrinsics = self.pose_estimator.estimate_current_extrinsics(cabin_image)

# 乘员检测
occupant_3d = self._detect_occupant_3d(cabin_image, extrinsics)

# OOP分类
is_oop = self.oop_classifier.classify(occupant_3d)

return {
'is_oop': is_oop,
'occupant_position': occupant_3d,
'camera_extrinsics': extrinsics
}

def _detect_occupant_3d(self, image, extrinsics):
"""
3D乘员检测(位姿补偿)

将图像坐标转换为车辆坐标系
"""
# 2D检测
keypoints_2d = self._detect_keypoints_2d(image)

# 深度估计(单目深度或雷达融合)
depths = self._estimate_depth(image, keypoints_2d)

# 3D重建
keypoints_3d_camera = self._backproject_to_3d(keypoints_2d, depths)

# 转换到车辆坐标系(使用当前外参)
keypoints_3d_vehicle = self._transform_to_vehicle(
keypoints_3d_camera,
extrinsics
)

return keypoints_3d_vehicle

3. Euro NCAP对接

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def encap_camera_calibration_test(pose_estimator, test_sequence):
"""
Euro NCAP相机标定评估

测试场景:
1. 后视镜调整(±30°范围)
2. 振动漂移(长期驾驶)
3. 温度变化(-40°C到85°C)
"""
results = []

for sample in test_sequence:
# 估计位姿
estimated_pose = pose_estimator.estimate_current_extrinsics(
sample['current_image']
)

# 计算误差
rotation_error = compute_rotation_error(
estimated_pose['rotation'],
sample['gt_rotation']
)

translation_error = compute_translation_error(
estimated_pose['translation'],
sample['gt_translation']
)

results.append({
'rotation_error_deg': rotation_error,
'translation_error_mm': translation_error,
'pass': rotation_error < 5 and translation_error < 20
})

# 统计
pass_rate = sum(r['pass'] for r in results) / len(results)

return {
'pass_rate': pass_rate,
'mean_rotation_error': np.mean([r['rotation_error_deg'] for r in results]),
'mean_translation_error': np.mean([r['translation_error_mm'] for r in results]),
'encap_pass': pass_rate >= 0.95 # Euro NCAP要求95%通过率
}

技术亮点总结

方面 贡献
问题定义 首次提出车辆无关的参考相对位姿表示
架构设计 Transformer处理鱼眼畸变,无需去畸变
度量平移 预测度量级平移,满足安全气囊需求
泛化能力 纯合成训练,零样本泛化到真实座舱

参考文献

  1. DINOv3: “Self-supervised Vision Transformers”, 2024
  2. Euro NCAP: “Occupant Monitoring Protocol v0.9”, 2024
  3. ISO 8855: “Vehicle Dynamics and Road-Holding Ability”, 2011

开发优先级: 🟡 中(OOP检测支撑技术)
技术成熟度: TRL 4(实验室验证)
部署难度: 中等(需集成到现有DMS/OMS)
量产时间线: 2027-2028年(预估)


InCaRPose:车载鱼眼相机相对位姿估计与外参标定
https://dapalm.com/2026/07/23/2026-07-23-incarpose-camera-calibration-oop/
作者
Mars
发布于
2026年7月23日
许可协议