Fig. 6

An example of applying the periodical feature detector on an MCCE frame sequence (case2 in the testing set). For each interval value I from 10 to 50 s, the periodical detector will generate a corresponding feature difference score. The I (between predefined \(T_l\) and \(T_u\)) with local minimum feature difference score will be identified as the detected period P. In this case, the detected period of human gastric peristalsis is 17.5 s (denoted as red line), which is close to the counted period (19.2s).