·1080 工程科学学报，第42卷，第8期 Block Type Number Size/Stride Output Convolutional 24 3×3/1 416×416 Convolutional 3×3/2 208×208 Convolutional 24 1×1/1 年 Convolutional 48 3×3/1 Residual 208×208 Convolutional 96 3×3/2 104×104 Convolutional 48 1×1/1 2× Convolutional 96 3×3/1 Residual 104×104 Convolutional 192 3×3/2 52×52 Convolutional 96 1×1/1 Scale3 8× Convolutional 192 3×3/1 Residual 52×52 Convolutional 384 3×3/2 26×26 Convolutional 192 1×1/1 Scale2 8× Convolutional 384 3×3/1 Residual 26×26 Convolutional 768 3×3/2 13×13 Convolutional 384 1×1/1 Scalel 4× Convolutional 768 3×3/1 Residual 13×13 Avgpool Global Connected 1000 Convs Convs Convs Softmax YOLO Detection 图6网络参数图 Fig.6 Network parameter diagram (a) (b) (c) 0.040 (d) 0.05 -Blue channel -Blue channel -Green channel 0.035 -Green channel Red channel 0.04 0.030 Red channel 0.025 0.03 0.020 0.02 0.015 0.010 0.01 0.005 0 0 50 100150200250 0 50 100150200 250 Pixel value Pixel value 图7整体光照不足的图像.()图像处理前：(b)图像处理后：(c)图像处理前的像素概率直方图：()图像处理后的像素概率直方图 Fig.7 Images with low overall illumination:(a)image before processing;(b)image after processing,(c)pixel probability histograms of image before processing.(d)pixel probability histograms of image after processing 复杂光照条件下的图像质量，为后续检测提供质 3.3实验检测结果及分析 量良好的样本，有利于检测性能的提升 由于目前没有公开的弱光照交通标志数据集，复杂光照条件下的图像质量，为后续检测提供质 量良好的样本，有利于检测性能的提升. 3.3    实验检测结果及分析 由于目前没有公开的弱光照交通标志数据集， Type Number Output Size / Stride Convolutional 24 3×3/1 416×416 Convolutional 48 3×3/2 208×208 Convolutional 24 1×1/1 Convolutional 48 3×3/1 Residual 208×208 Convolutional 96 3×3/2 104×104 Convolutional 48 1×1/1 Convolutional 96 3×3/1 Residual 104×104 1× 2× Convolutional 192 3×3/2 52×52 Convolutional 96 1×1/1 Convolutional 192 3×3/1 Residual 52×52 8× Convolutional 384 3×3/2 26×26 Convolutional 192 1×1/1 Convolutional 384 3×3/1 Residual 26×26 8× Convolutional 768 3×3/2 13×13 Convolutional 384 1×1/1 Convolutional 768 3×3/1 Residual 13×13 4× Avgpool Global Connected 1000 Softmax Convs Convs Convs YOLO Detection Scale1 Scale2 Scale3 Block 图 6    网络参数图 Fig.6    Network parameter diagram (c) Pixel value Red channel Blue channel Green channel Probability Probability Pixel value (d) Red channel Blue channel Green channel 0.05 0.035 0.040 0.04 0.030 0.03 0.025 0.02 0.020 0.01 0.015 0 0.010 0.005 0 0 100 150 200 250 50 0 50 100 150 200 250 (a) (b) 图 7    整体光照不足的图像. （a）图像处理前；（b）图像处理后；（c）图像处理前的像素概率直方图；（d）图像处理后的像素概率直方图 Fig.7    Images with low overall illumination: (a) image before processing; (b) image after processing; (c) pixel probability histograms of image before processing; (d) pixel probability histograms of image after processing · 1080 · 工程科学学报，第 42 卷，第 8 期