Table 3.

FCN8 endoluminal scene semantic segmentation results for different numbers of classes. The results are reported on validation set. In all cases, we selected the model that provided best validation results (with or without class balancing).

Number of classes	IoU background	IoU polyp	IoU lumen	IoU spec.	IoU mean	Acc mean
4	92.07	39.37	59.55	40.52	57.88	92.48
3	92.19	50.70	56.48	—	66.46	92.82
2	96.63	56.07	—	—	76.35	96.77