Lightweight Ship Detection Methods Based on YOLOv3 and DenseNet

Table 1

The structure of the LSDM backbone network.

	Type	Filters	Size/stride	Output size
	Conv	32	33/1	416416
	Avg_pool		2/2	208208
1x	Conv	128	11/1	208208
	Conv	32	33/1	208208
	Avg_pool		2/2	104104
2x	Conv	128	11/1	104104
	Conv	32	33/1	104104
	Avg_pool		2/2	5252
4x	Conv	128	11/1	5252
	Conv	32	33/1	5252
	Avg_pool		2/2	2626
8x	Conv	128	11/1	2626
	Conv	32	33/1	2626
	Avg_pool		2/2	1313
16x	Conv	128	11/1	1313
	Conv	32	33/1	1313

The units with gray color are densely connected units (its structure is shown in Figure 3).