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. 2019 Jun 25;14(6):e0218808. doi: 10.1371/journal.pone.0218808

Fig 4. SSD architecture.

Fig 4

To multi-scale feature maps for detection, several feature layers (Conv6_2, Conv7_2, Conv8_2 and Conv9_2) were added to the end of base network (VGG16), where the larger size feature maps, such as Conv4_3, were used to detect small size leukocytes while the smaller size feature map to detect the large size.