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自动驾驶如何“看见”路上的小石头?

  • 2026-02-05 04:11:15
自动驾驶如何“看见”路上的小石头?

近日,有读者提问:“自动驾驶汽车如何检测像石头这样的小障碍物?”在直接回答“如何检测”之前,我们首先需要思考一个更根本的问题:对于这类不显眼的目标,自动驾驶系统真的需要检测吗?

答案是肯定的。无论是掉落的货物、轮胎碎片,还是路面的石块,这些“异常物体”虽不常见,却可能对高速行驶的车辆构成严重安全威胁(如爆胎、失控)。因此,精准识别它们是实现高阶自动驾驶不可或缺的能力。

核心挑战:为什么小石头是道“难题”?

自动驾驶的“眼睛”——视觉感知系统,主要依赖大量数据学习。而像石头这类物体,检测难点在于:

1、非常规类别:不属于模型训练时常见的“车辆”、“行人”等主要类别,系统缺乏先验知识。

2、尺寸小、特征弱:在图像中可能只占极少数像素,且颜色、纹理易与路面、阴影混淆,难以提取有效特征。

3、判别困难:单从外观上,机器难以区分一片阴影、一个路面修补处和一块有威胁的石头。

自动驾驶的“解题思路”:多任务协同与多传感器融合

面对挑战,自动驾驶系统并非只依赖单一方法,而是通过一套组合策略来应对:

1. 视觉感知的“基本功”:目标检测与语义分割

  • 目标检测:模型(如YOLO、Faster R-CNN)会在图像中框出物体。对于未知类别,系统可能输出“未知障碍物”或低置信度检测框,以此向决策层发出预警。

  • 语义分割:该任务对图像进行像素级分类。即使模型从未学过“石头”这个类别,只要它学会了识别“正常路面”与“路面上的异常区域”,就能将石头所在的像素标记为“非路面/障碍物”。这是识别未知障碍物的关键技术。

2. 针对性的优化:小目标检测技术由于传统模型易忽略小目标,工程师们会专门优化:

  • 使用高分辨率摄像头,捕捉更多细节。

  • 采用特征金字塔网络(FPN)等结构,增强模型对多尺度目标的感知能力,让小目标特征更明显。

  • 引入注意力机制,让模型学会聚焦于图像中“看起来不对劲”的区域。

3. 超越纯视觉:多传感器融合是关键纯视觉在极端场景下仍可能失效,因此必须融合其他传感器数据:

  • 激光雷达(LiDAR):提供精确的三维点云。石头在点云中会表现为“路面上的突兀凸起”。即使视觉上难以辨认,LiDAR也能通过高度差可靠地识别其物理存在,极大提升检测的鲁棒性。

  • 毫米波雷达:对固体物体反射敏感,可提供目标的距离和相对速度信息,与视觉、LiDAR形成互补。

安全是最终目标

总而言之,自动驾驶汽车检测小石头等异常物体,并非依赖某个单一的“神奇算法”,而是一套系统工程:

  • 感知层面:依靠深度学习模型(目标检测、语义分割)从图像中识别异常。

  • 技术增强:通过小目标检测优化提升灵敏度。

  • 系统保障:通过多传感器融合(视觉+LiDAR+雷达)进行交叉验证,确保在任何光照、天气条件下都能可靠识别物理障碍。

其最终目的只有一个:将人类驾驶中那些难以瞬间察觉的细微危险,转化为系统可稳定感知、评估和处理的确定性信息,从而让自动驾驶行驶得更安全、更可靠。

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  1. CONNECT:[ UseTime:0.000399s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000576s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000234s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000815s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000561s ]
  8. SELECT * FROM `article` WHERE `id` = 467765 LIMIT 1 [ RunTime:0.001677s ]
  9. UPDATE `article` SET `lasttime` = 1770555021 WHERE `id` = 467765 [ RunTime:0.000518s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000782s ]
  11. SELECT * FROM `article` WHERE `id` < 467765 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000493s ]
  12. SELECT * FROM `article` WHERE `id` > 467765 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005237s ]
  13. SELECT * FROM `article` WHERE `id` < 467765 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010972s ]
  14. SELECT * FROM `article` WHERE `id` < 467765 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008683s ]
  15. SELECT * FROM `article` WHERE `id` < 467765 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015625s ]
0.117632s