基于残差单发多框检测器模型的交通标志检测与识别

Traffic sign detection and recognition based on residual single shot multibox detector model

针对现有目标检测方法仅适用于大尺寸、少量特定种类交通标志的检测,且对复杂交通场景图像检测效果不佳的问题,以抗退化性能较强的ResNet101为基础网络,增加若干卷积层构建残差单发多框检测器(SSD)模型,对高分辨率的交通图像进行多尺度分块检测。为了加快检测速度,采取由粗到精的策略,省略对纯背景图像块的预测.利用中等尺度图像块的初检结果缩小目标范围;对目标范围内的其他图像块进行检测;将所有图像块结果映射回原图像,并结合非极大值抑制实现精准识别。实验结果表明,该模型在公开的交通标志数据集Tsinghua-Tencent 100K上取得了94%的总体准确率和95%的总体召回率,对多分辨率图像中不同大小和形态的交通标志都具有良好的检测能力,鲁棒性较强。

The existing target detection methods were only suitable for large size and few specific types of traffic signs, and showed poor performance on complex traffic scene images. The ResNet101 with strong anti-degradation performance was used as basic network, and then a residual single shot multibox detector (SSD) model added with a number of convolution layers was proposed, in order to conduct multi-scale block detection on high resolution traffic images. A strategy Coarse-to-Fine was adopted to omit the prediction of pure background image blocks, in order to speed up. The target range was narrowed by the initial detection results of the medium scale image block. The other blocks within the target range were detected. All the block results were mapped back to the original image and nonmaximum suppression was used to realize accurate recognition. Experiment results showed that the proposed method achieved 94% overall accuracy and 95% overall recall on the public traffic sign dataset Tsinghua-Tencent 100K. The detection ability on traffic sign with different sizes and shapes in multi-resolution images was strong and the proposed model was robust.