Figure 1.

Schematic flowchart of the single-shot multibox detector (SSD) for esophageal neoplasms. Under the input of 300 × 300 SSD, Conv7, Conv8_2, Conv9_2, Conv10_2, and Conv11_2 were extracted as the feature maps for detection in the newly added convolutional layer to generate more layers with smaller scales and facilitate multilayer feature fusion. A total of six feature maps whose sizes were (38, 38), (19, 19), (10, 10), (5, 5), (3, 3), and (1, 1) were extracted with the Conv4_3 layer.