SSD diagnostic result of NBI esophageal neoplasm image. All green boxes in the figure are ground truth. The numbers in the label indicate the probability of being judged as the number of esophageal cancer stages in the box. (a) Image of a normal esophagus. No frame is displayed under the SSD diagnosis. Thus, the SSD diagnosis was normal esophagus. (b) Esophageal endoscopy image with a low-grade dysplastic area. Under SSD diagnosis, a blue border box is displayed around the lesion area, and the lesion area is therefore determined to be low-grade dysplasia. (c) Esophageal endoscopic image with an area of high-grade dysplasia. Under SSD diagnosis, a gray border box is displayed around the lesion area, and the lesion area is therefore determined to be high-grade dysplasia. (d) Esophageal endoscopic image with an esophageal cancer area. Under SSD diagnosis, an orange bounding box surrounds the lesion area and determines that the lesion area is cancer.