Table 2.

Manually annotated (ground truth) labels of four training/test sets

No. (cite)	NA	PX	ES	SJ	FS	MA	MR	AS	LB	AM	DB	DD
0 (proposed)	–	0	1	2	3	4	5	6	7	8	9	10
1 (proposed)	0	1	2	3	4	5	6	7	8	9	10	11
2 ([1, 16])	–	–	0	1	2	3	–	4	–	5	6	7
3 ([1, 16])	0	–	1	2	3	4	–	5	–	6	7	8

–, does not exist; NA, unqualified; PX, pharynx; ES, oesophagus; SJ, squamocolumnar junction; FS, fundus; MA, middle-upper body antegrade view; MR, middle-upper body retroflex view; AS, angulus; LB, lower body; AM, antrum; DB, duodenal bulb; DD, duodenal descending