基于扩张卷积金字塔网络的车道线检测算法

为满足汽车高级驾驶辅助系统对车道线检测准确性和时效性的要求，采用改进的ResNet50网络作为基础模型提取局部车道线特征，利用扩张卷积能指数级扩大感受野的特点，设计了扩张卷积金字塔模块，用以完整提取不同尺度的车道线特征，提出“锚点栅格”的思想，将输出划分为一组栅格，对每个栅格进行分类和回归分析，经过非极大值抑制等后处理，最终输出车道线标记点集. 结果表明:在CULane多场景数据集里对模型进行测试，在交并比阈值取为0.3的评估条件下其综合评估指标F-measure达到78.6%，检测速率达到40帧/s，在评估指标相近的情况下具有远高于空间卷积神经网络（spatial convolutional neural networks，SCNN）模型的检测速率，并在眩光、弯道等困难场景中的检测效果优于SCNN. 

Lane Detection Algorithm Based on Dilated Convolution Pyramid Network

In order to meet the accuracy and timeliness requirements of advanced driver-assistance system in lane detection, the improved ResNet50 network as the basic model to extract the features of the local laneline is proposed. Given that the dilated convolution can exponentially expand the receptive field, the dilated convolutional pyramid module is designed to completely extract the laneline features on different scales. The idea of anchor grid is proposed, by which the output is divided into a set of grids, and each grid is classified and analyzed by regression. After non-maximum suppression and other post-processes, a set of laneline marking points are output by the model. Experimental results show that if the model is tested with CULane multi-scene dataset and the intersection-over-union (IoU) threshold is 0.3, the comprehensive evaluation index F-measure reaches 78.6% and the detection rate reaches 40 frames per second. With similar evaluation indexes, the detection rate of the proposed model is much higher than that of the spatial convolutional neural networks (SCNN) model, and its detection performance in difficult scenes such as dazzle light and curve is more desirable.