Euro NCAP 2026安全带误用检测要求深度解读与实现方案

Euro NCAP 2026安全带误用检测要求深度解读与实现方案

法规背景

Euro NCAP概述

Euro NCAP(European New Car Assessment Programme)是欧洲新车评估计划,是全球最具影响力的汽车安全评级机构之一。2026年版本引入了多项新的安全要求,其中安全带误用检测是重点之一。

核心要求

定义:安全带误用(Seatbelt Misuse)是指驾驶员或乘客虽然系了安全带,但使用方式不正确,导致保护效果降低或完全失效。

常见误用类型

graph TB
    A[安全带误用] --> B[位置错误]
    A --> C[使用错误]
    A --> D[状态错误]
    
    B --> B1[肩带位于身后]
    B --> B2[肩带位于腋下]
    B --> B3[腰带位置过高]
    
    C --> C1[安全带松弛]
    C --> C2[安全带扭转]
    C --> C3[夹子固定]
    
    D --> D1[儿童误用成人带]
    D --> D2[多人共用]
    D --> D3[物品代替人体]

评分标准

误用场景 检测要求 评分权重
肩带位于身后 必须检测 2分
肩带位于腋下 必须检测 2分
安全带松弛 必须检测 2分
儿童误用 必须检测 3分
多人共用 必须检测 2分
物品代替 必须检测 1分
总分 - 12分

技术实现架构

整体系统架构

graph TB
    subgraph 感知层
        A[车内摄像头<br/>RGB+IR]
        B[安全带张力传感器]
        C[座椅压力传感器]
        D[ buckle状态传感器]
    end
    
    subgraph 特征提取
        E[视觉特征提取<br/>CNN]
        F[传感器数据融合]
        G[时序特征建模]
    end
    
    subgraph 检测算法
        H[安全带分割]
        I[人体姿态估计]
        J[误用分类器]
    end
    
    subgraph 决策输出
        K[误用类型判定]
        L[置信度评估]
        M[警告策略]
    end
    
    A --> E --> H --> J --> K --> M
    B --> F --> J --> L --> M
    C --> F
    D --> F
    A --> G --> I --> J

核心技术实现

1. 安全带分割网络

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import torch
import torch.nn as nn
import torch.nn.functional as F

class SeatbeltSegmentationNet(nn.Module):
"""
安全带语义分割网络
输入: RGB图像 (B, 3, H, W)
输出: 分割掩码 (B, num_classes, H, W)

类别:
- 0: 背景
- 1: 肩带
- 2: 腰带
- 3: buckle
"""
def __init__(self, num_classes=4):
super().__init__()

# 编码器 (ResNet-50骨干)
self.encoder = ResNetEncoder(pretrained=True)

# 解码器 (FPN)
self.decoder = FPNDecoder(
in_channels=[256, 512, 1024, 2048],
out_channels=128
)

# 注意力模块
self.attention = ChannelSpatialAttention(128)

# 分割头
self.seg_head = nn.Sequential(
nn.Conv2d(128, 64, 3, padding=1),
nn.BatchNorm2d(64),
nn.ReLU(),
nn.Conv2d(64, num_classes, 1)
)

def forward(self, x):
"""
Args:
x: (B, 3, H, W) 输入图像
Returns:
segmentation: (B, num_classes, H, W) 分割logits
"""
# 多尺度特征提取
features = self.encoder(x)

# 特征金字塔解码
decoded = self.decoder(features)

# 注意力增强
attended = self.attention(decoded)

# 分割预测
segmentation = self.seg_head(attended)

# 上采样到原分辨率
segmentation = F.interpolate(
segmentation,
size=x.shape[2:],
mode='bilinear',
align_corners=False
)

return segmentation


class ResNetEncoder(nn.Module):
"""ResNet编码器"""
def __init__(self, pretrained=True):
super().__init__()

import torchvision.models as models
resnet = models.resnet50(pretrained=pretrained)

# 提取各层
self.conv1 = resnet.conv1
self.bn1 = resnet.bn1
self.relu = resnet.relu
self.maxpool = resnet.maxpool

self.layer1 = resnet.layer1 # 256
self.layer2 = resnet.layer2 # 512
self.layer3 = resnet.layer3 # 1024
self.layer4 = resnet.layer4 # 2048

def forward(self, x):
"""返回多尺度特征"""
features = []

x = self.conv1(x)
x = self.bn1(x)
x = self.relu(x)
x = self.maxpool(x)

x = self.layer1(x)
features.append(x)

x = self.layer2(x)
features.append(x)

x = self.layer3(x)
features.append(x)

x = self.layer4(x)
features.append(x)

return features


class FPNDecoder(nn.Module):
"""特征金字塔解码器"""
def __init__(self, in_channels, out_channels):
super().__init__()

# 横向连接
self.lateral_convs = nn.ModuleList([
nn.Conv2d(in_ch, out_channels, 1)
for in_ch in in_channels
])

# 平滑卷积
self.smooth_convs = nn.ModuleList([
nn.Conv2d(out_channels, out_channels, 3, padding=1)
for _ in in_channels
])

def forward(self, features):
"""
自顶向下融合
"""
# 横向连接
laterals = [conv(f) for conv, f in zip(self.lateral_convs, features)]

# 自顶向下
for i in range(len(laterals)-1, 0, -1):
laterals[i-1] = laterals[i-1] + F.interpolate(
laterals[i],
size=laterals[i-1].shape[2:],
mode='nearest'
)

# 平滑
outputs = [conv(lat) for conv, lat in zip(self.smooth_convs, laterals)]

# 上采样到相同尺度
target_size = outputs[0].shape[2:]
upsampled = [outputs[0]]
for out in outputs[1:]:
upsampled.append(F.interpolate(out, size=target_size, mode='bilinear'))

# 拼接融合
fused = torch.cat(upsampled, dim=1)

# 降维
fused = nn.Conv2d(fused.shape[1], 128, 1)(fused)

return fused


class ChannelSpatialAttention(nn.Module):
"""通道-空间注意力"""
def __init__(self, channels, reduction=16):
super().__init__()

# 通道注意力
self.channel_attention = nn.Sequential(
nn.AdaptiveAvgPool2d(1),
nn.Conv2d(channels, channels // reduction, 1),
nn.ReLU(),
nn.Conv2d(channels // reduction, channels, 1),
nn.Sigmoid()
)

# 空间注意力
self.spatial_attention = nn.Sequential(
nn.Conv2d(channels, 1, 7, padding=3),
nn.Sigmoid()
)

def forward(self, x):
# 通道注意力
ca = self.channel_attention(x)
x = x * ca

# 空间注意力
sa = self.spatial_attention(x)
x = x * sa

return x

2. 安全带路径分析

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import numpy as np
from scipy.spatial.distance import cdist
from scipy.optimize import linear_sum_assignment

class SeatbeltPathAnalyzer:
"""
安全带路径分析器
分析安全带相对于人体关键点的位置
"""

def __init__(self):
# 人体关键点定义
self.keypoints = {
'left_shoulder': 0,
'right_shoulder': 1,
'left_hip': 2,
'right_hip': 3,
'neck': 4,
'chest': 5
}

def analyze_belt_path(self, segmentation_mask, body_keypoints):
"""
分析安全带路径

Args:
segmentation_mask: (H, W) 分割掩码
body_keypoints: dict, 人体关键点坐标
Returns:
misuse_info: dict, 误用信息
"""
# 提取肩带和腰带
shoulder_belt = (segmentation_mask == 1).astype(np.uint8)
lap_belt = (segmentation_mask == 2).astype(np.uint8)

# 肩带分析
shoulder_misuse = self._analyze_shoulder_belt(
shoulder_belt, body_keypoints
)

# 腰带分析
lap_misuse = self._analyze_lap_belt(lap_belt, body_keypoints)

# 松紧度分析
tightness = self._analyze_tightness(segmentation_mask)

# 综合判定
misuse_type = self._determine_misuse_type(
shoulder_misuse, lap_misuse, tightness
)

return {
'shoulder_belt_status': shoulder_misuse,
'lap_belt_status': lap_misuse,
'tightness': tightness,
'misuse_type': misuse_type
}

def _analyze_shoulder_belt(self, shoulder_belt, keypoints):
"""分析肩带位置"""

# 肩带骨架提取
belt_skeleton = self._extract_skeleton(shoulder_belt)

# 肩带起点和终点
if len(belt_skeleton) == 0:
return {'status': 'not_detected', 'confidence': 0.0}

# 拟合肩带路径
belt_path = self._fit_belt_path(belt_skeleton)

# 检测误用
shoulder_left = keypoints['left_shoulder']
shoulder_right = keypoints['right_shoulder']
neck = keypoints['neck']

# 检查肩带是否在肩膀外侧(身后)
distance_to_shoulder = self._point_to_line_distance(
shoulder_left, belt_path
)

# 检查肩带是否在腋下
distance_to_armpit = self._check_armpit_position(
belt_path, shoulder_left, shoulder_right
)

# 判定
if distance_to_shoulder > 50: # 阈值:像素
return {
'status': 'behind_shoulder',
'confidence': 0.9
}
elif distance_to_armpit < 30:
return {
'status': 'under_arm',
'confidence': 0.85
}
else:
return {
'status': 'normal',
'confidence': 0.95
}

def _analyze_lap_belt(self, lap_belt, keypoints):
"""分析腰带位置"""

# 腰带检测
if lap_belt.sum() == 0:
return {'status': 'not_detected', 'confidence': 0.0}

# 腰带中心线
belt_center_y = self._find_belt_center(lap_belt)

# 髋部位置
hip_y = (keypoints['left_hip'][1] + keypoints['right_hip'][1]) / 2

# 腰带是否过高
if belt_center_y < hip_y - 100: # 高于髋部100像素
return {
'status': 'too_high',
'confidence': 0.9
}

return {
'status': 'normal',
'confidence': 0.9
}

def _analyze_tightness(self, segmentation_mask):
"""分析安全带松紧度"""

shoulder_belt = (segmentation_mask == 1)
lap_belt = (segmentation_mask == 2)

# 计算安全带宽度
if shoulder_belt.sum() > 0:
shoulder_width = self._compute_belt_width(shoulder_belt)
else:
shoulder_width = 0

# 正常宽度范围
normal_width_min = 30
normal_width_max = 60

# 判定松紧度
if shoulder_width < normal_width_min:
return {
'status': 'too_tight',
'confidence': 0.7
}
elif shoulder_width > normal_width_max:
return {
'status': 'too_loose',
'confidence': 0.8
}
else:
return {
'status': 'normal',
'confidence': 0.9
}

def _extract_skeleton(self, binary_mask):
"""提取骨架"""
from skimage.morphology import skeletonize

skeleton = skeletonize(binary_mask)
points = np.argwhere(skeleton)

return points

def _fit_belt_path(self, skeleton_points):
"""拟合安全带路径"""
# 使用RANSAC拟合直线
from sklearn.linear_model import RANSACRegressor

if len(skeleton_points) < 10:
return None

X = skeleton_points[:, 1].reshape(-1, 1) # x坐标
y = skeleton_points[:, 0] # y坐标

ransac = RANSACRegressor()
ransac.fit(X, y)

# 返回拟合直线参数
return {
'slope': ransac.estimator_.coef_[0],
'intercept': ransac.estimator_.intercept_
}

def _point_to_line_distance(self, point, line_params):
"""计算点到直线距离"""
if line_params is None:
return float('inf')

x, y = point
slope = line_params['slope']
intercept = line_params['intercept']

# 点到直线距离
distance = abs(slope * x - y + intercept) / np.sqrt(slope**2 + 1)

return distance

def _check_armpit_position(self, belt_path, left_shoulder, right_shoulder):
"""检查是否在腋下"""
# 简化实现
return 50 # 返回距离

def _find_belt_center(self, lap_belt):
"""找到腰带中心Y坐标"""
y_coords = np.where(lap_belt)[0]
return y_coords.mean() if len(y_coords) > 0 else 0

def _compute_belt_width(self, belt_mask):
"""计算安全带宽度"""
# 沿着安全带方向计算宽度
widths = []
for col in range(belt_mask.shape[1]):
col_pixels = np.where(belt_mask[:, col])[0]
if len(col_pixels) > 1:
width = col_pixels.max() - col_pixels.min()
widths.append(width)

return np.mean(widths) if widths else 0

def _determine_misuse_type(self, shoulder_status, lap_status, tightness):
"""综合判定误用类型"""

misuses = []

if shoulder_status['status'] == 'behind_shoulder':
misuses.append(('behind_shoulder', shoulder_status['confidence']))

if shoulder_status['status'] == 'under_arm':
misuses.append(('under_arm', shoulder_status['confidence']))

if lap_status['status'] == 'too_high':
misuses.append(('lap_belt_too_high', lap_status['confidence']))

if tightness['status'] == 'too_loose':
misuses.append(('belt_too_loose', tightness['confidence']))

if tightness['status'] == 'too_tight':
misuses.append(('belt_too_tight', tightness['confidence']))

if not misuses:
return [('normal', 0.95)]

return misuses

3. 多传感器融合

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class SeatbeltMisuseDetector(nn.Module):
"""
多传感器融合的安全带误用检测器
"""
def __init__(self):
super().__init__()

# 视觉模态
self.vision_encoder = VisionEncoder()

# 传感器模态
self.sensor_encoder = SensorEncoder()

# 跨模态融合
self.fusion = CrossModalFusion(
vision_dim=256,
sensor_dim=64,
fusion_dim=128
)

# 误用分类器
self.misuse_classifier = nn.Sequential(
nn.Linear(128, 64),
nn.ReLU(),
nn.Dropout(0.5),
nn.Linear(64, 7) # 6种误用 + 1种正常
)

def forward(self, image, sensor_data):
"""
Args:
image: (B, 3, H, W) RGB图像
sensor_data: dict包含:
- belt_tension: 安全带张力
- seat_pressure: 座椅压力分布
- buckle_status: buckle状态
Returns:
misuse_logits: (B, 7) 误用类别logits
"""
# 视觉特征
vision_features = self.vision_encoder(image)

# 传感器特征
sensor_features = self.sensor_encoder(sensor_data)

# 融合
fused_features = self.fusion(vision_features, sensor_features)

# 分类
misuse_logits = self.misuse_classifier(fused_features)

return misuse_logits


class VisionEncoder(nn.Module):
"""视觉特征编码器"""
def __init__(self):
super().__init__()

# 共享骨干
self.backbone = ResNetEncoder(pretrained=True)

# 安全带分割
self.segmentation_head = SeatbeltSegmentationNet()

# 人体姿态估计
self.pose_head = PoseEstimationHead()

# 特征融合
self.fusion = nn.Conv2d(256 + 17, 256, 1) # 分割 + 姿态

def forward(self, image):
# 分割
seg_mask = self.segmentation_head(image)

# 姿态
keypoints = self.pose_head(image)

# 融合
combined = torch.cat([seg_mask, keypoints], dim=1)
features = self.fusion(combined)

# 全局池化
features = F.adaptive_avg_pool2d(features, 1).squeeze()

return features


class PoseEstimationHead(nn.Module):
"""人体姿态估计头"""
def __init__(self, num_keypoints=17):
super().__init__()

# 简化的姿态估计网络
self.conv = nn.Sequential(
nn.Conv2d(2048, 256, 3, padding=1),
nn.ReLU(),
nn.Conv2d(256, num_keypoints, 1)
)

def forward(self, image):
# 简化:返回热图
return torch.randn(image.size(0), 17, image.size(2)//32, image.size(3)//32)


class SensorEncoder(nn.Module):
"""传感器数据编码器"""
def __init__(self):
super().__init__()

# 张力编码
self.tension_encoder = nn.Sequential(
nn.Linear(10, 32),
nn.ReLU()
)

# 压力分布编码
self.pressure_encoder = nn.Sequential(
nn.Conv2d(1, 16, 3, padding=1),
nn.ReLU(),
nn.AdaptiveAvgPool2d((4, 4)),
nn.Flatten(),
nn.Linear(16 * 4 * 4, 32)
)

# Buckle状态编码
self.buckle_encoder = nn.Linear(3, 16) # 左/右/后排

def forward(self, sensor_data):
"""
编码传感器数据
"""
# 张力特征
tension = sensor_data['belt_tension'] # (B, 10)
tension_feat = self.tension_encoder(tension)

# 压力特征
pressure = sensor_data['seat_pressure'] # (B, 1, H, W)
pressure_feat = self.pressure_encoder(pressure)

# Buckle特征
buckle = sensor_data['buckle_status'] # (B, 3)
buckle_feat = self.buckle_encoder(buckle)

# 拼接
combined = torch.cat([tension_feat, pressure_feat, buckle_feat], dim=1)

return combined


class CrossModalFusion(nn.Module):
"""跨模态融合"""
def __init__(self, vision_dim, sensor_dim, fusion_dim):
super().__init__()

# 注意力融合
self.attention = nn.MultiheadAttention(
embed_dim=fusion_dim,
num_heads=4
)

# 特征投影
self.vision_proj = nn.Linear(vision_dim, fusion_dim)
self.sensor_proj = nn.Linear(sensor_dim, fusion_dim)

# 融合层
self.fusion_layer = nn.Sequential(
nn.Linear(fusion_dim * 2, fusion_dim),
nn.ReLU()
)

def forward(self, vision_feat, sensor_feat):
# 投影
vision_proj = self.vision_proj(vision_feat).unsqueeze(1)
sensor_proj = self.sensor_proj(sensor_feat).unsqueeze(1)

# 注意力
stacked = torch.cat([vision_proj, sensor_proj], dim=1)
attended, _ = self.attention(stacked, stacked, stacked)

# 融合
fused = self.fusion_layer(attended.view(attended.size(0), -1))

return fused

4. 训练与评估

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import torch.optim as optim
from torch.utils.data import DataLoader

class SeatbeltMisuseTrainer:
"""训练器"""

def __init__(self, model, device):
self.model = model.to(device)
self.device = device

self.criterion = nn.CrossEntropyLoss()
self.optimizer = optim.AdamW(model.parameters(), lr=1e-4)

def train_epoch(self, dataloader):
"""训练一个epoch"""
self.model.train()
total_loss = 0

for batch in dataloader:
image = batch['image'].to(self.device)
sensor_data = {
k: v.to(self.device) for k, v in batch['sensor'].items()
}
label = batch['label'].to(self.device)

# 前向
logits = self.model(image, sensor_data)
loss = self.criterion(logits, label)

# 反向
self.optimizer.zero_grad()
loss.backward()
self.optimizer.step()

total_loss += loss.item()

return total_loss / len(dataloader)

def evaluate(self, dataloader):
"""评估"""
self.model.eval()

correct = 0
total = 0

with torch.no_grad():
for batch in dataloader:
image = batch['image'].to(self.device)
sensor_data = {
k: v.to(self.device) for k, v in batch['sensor'].items()
}
label = batch['label'].to(self.device)

logits = self.model(image, sensor_data)
pred = logits.argmax(dim=1)

correct += (pred == label).sum().item()
total += label.size(0)

return correct / total


def evaluate_per_class(model, dataloader, device, num_classes=7):
"""各类别评估"""
model.eval()

confusion_matrix = np.zeros((num_classes, num_classes), dtype=int)

class_names = [
'normal',
'behind_shoulder',
'under_arm',
'lap_too_high',
'too_loose',
'too_tight',
'child_misuse'
]

with torch.no_grad():
for batch in dataloader:
image = batch['image'].to(device)
sensor_data = {k: v.to(device) for k, v in batch['sensor'].items()}
label = batch['label'].to(device)

logits = model(image, sensor_data)
pred = logits.argmax(dim=1)

for true, pred_label in zip(label.cpu().numpy(), pred.cpu().numpy()):
confusion_matrix[true, pred_label] += 1

# 打印结果
print("\nPer-Class Performance:")
print("-" * 60)

for i, name in enumerate(class_names):
tp = confusion_matrix[i, i]
fp = confusion_matrix[:, i].sum() - tp
fn = confusion_matrix[i, :].sum() - tp

precision = tp / (tp + fp + 1e-6)
recall = tp / (tp + fn + 1e-6)
f1 = 2 * precision * recall / (precision + recall + 1e-6)

print(f"{name:20s} | Precision: {precision:.3f} | Recall: {recall:.3f} | F1: {f1:.3f}")

print("-" * 60)

性能要求与测试

Euro NCAP测试场景

测试场景 数量 要求检出率 允许误报率
肩带身后 50 ≥95% ≤3%
肩带腋下 50 ≥95% ≤3%
安全带松弛 50 ≥90% ≤5%
腰带过高 50 ≥90% ≤5%
儿童误用 30 ≥98% ≤1%
多人共用 30 ≥95% ≤2%

实现难点与解决方案

难点 描述 解决方案
遮挡 安全带被手臂/衣物遮挡 多摄像头 + 传感器融合
光照 夜间/逆光条件 红外照明 + HDR
颜色 黑色安全带难识别 边缘检测 + 纹理特征
个体差异 体型/服装多样性 数据增强 + 合成数据

IMS开发启示

1. 系统集成建议

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# IMS集成代码示例
class IMSSeatbeltMonitor:
"""IMS安全带监测模块"""

def __init__(self):
self.detector = SeatbeltMisuseDetector()
self.path_analyzer = SeatbeltPathAnalyzer()

def monitor(self, camera_frame, sensor_data):
"""
实时监测

Returns:
alert_level: 0=正常, 1=警告, 2=严重
misuse_type: 误用类型
confidence: 置信度
"""
# 检测
misuse_logits = self.detector(camera_frame, sensor_data)
misuse_class = misuse_logits.argmax(dim=1).item()
confidence = torch.softmax(misuse_logits, dim=1).max().item()

# 分类映射
if misuse_class == 0: # 正常
return 0, 'normal', confidence
elif misuse_class in [1, 2, 4]: # 严重误用
return 2, self._get_misuse_name(misuse_class), confidence
else: # 轻度误用
return 1, self._get_misuse_name(misuse_class), confidence

def _get_misuse_name(self, class_id):
names = {
0: 'normal',
1: 'behind_shoulder',
2: 'under_arm',
3: 'lap_too_high',
4: 'too_loose',
5: 'too_tight',
6: 'child_misuse'
}
return names.get(class_id, 'unknown')

2. 部署优化

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# 模型量化
def quantize_model(model):
"""量化模型以适应嵌入式平台"""
model.eval()

# 动态量化
quantized_model = torch.quantization.quantize_dynamic(
model,
{nn.Linear, nn.Conv2d},
dtype=torch.qint8
)

return quantized_model

# TensorRT优化
def export_to_onnx(model, dummy_input, output_path):
"""导出ONNX用于TensorRT"""
torch.onnx.export(
model,
dummy_input,
output_path,
opset_version=11,
input_names=['image', 'sensor_data'],
output_names=['misuse_logits'],
dynamic_axes={
'image': {0: 'batch_size'},
'misuse_logits': {0: 'batch_size'}
}
)

作者: IMS技术团队
版本: v1.0
最后更新: 2026-06-12


Euro NCAP 2026安全带误用检测要求深度解读与实现方案
https://dapalm.com/2026/06/12/2026-06-12-euro-ncap-seatbelt-misuse-detection/
作者
Mars
发布于
2026年6月12日
许可协议