“…Depending on the areas in gastrointestinal tract (GI), the methods can be broken down for the esophagus [16], the stomach [17,7], the small intestine [2][3][4][5] and the colon [9,18]. Depending on the specific lesions, the diagnosis methods can be classified to handle bleeding [2], cancer [19,17], Celiac disease, Helicobacter pylori [7], polyps [20,14] and ulcers [4], motility assessment [21], tumors [6,7], Barrett's esophagus, Crohn's disease [9,18], and just classify the region into normal and abnormal [22]. Some other applications include detecting informative frames [3], WCE color video segmentation [23], summarization [24] and clustering [25].…”