Wireless Capsule Endoscopy (WCE) is a highly promising technology for gastrointestinal
(GI) tract abnormality diagnosis. However, low image resolution and low frame rates are challenging
issues in WCE. In addition, the relevant frames containing the features of interest for accurate
diagnosis only constitute 1% of the complete video information. For these reasons, analyzing
the WCE videos is still a time consuming and laborious examination for the gastroenterologists,
which reduces WCE system usability. This leads to the emergent need to speed-up and automates
the WCE video process for GI tract examinations. Consequently, the present work introduced the
concept of WCE technology, including the structure of WCE systems, with a focus on the medical
endoscopy video capturing process using image sensors. It discussed also the significant characteristics
of the different GI tract for effective feature extraction. Furthermore, video approaches for
bleeding and lesion detection in the WCE video were reported with computer-aided diagnosis systems
in different applications to support the gastroenterologist in the WCE video analysis. In image
enhancement, WCE video review time reduction is also discussed, while reporting the challenges
and future perspectives, including the new trend to employ the deep learning models for feature
Learning, polyp recognition, and classification, as a new opportunity for researchers to develop
future WCE video analysis techniques.