*2.2. Improved YOLOv5*

The convolutional block attention module (CBAM) is added to the Backbone of the original YOLOv5 model, the feature fusion of the fourth scale is embedded in the Neck, and the shallow detection layer is employed in the Head, which will be of benefit in detecting the small objects and inter occlusion. The improved model architecture is shown in Figure 2.

**Figure 2.** Architecture of the improved YOLOv5 Model.
